Deriving of the geometry and properties of dust around Herbig Ae/Be stars is a complex problem. Although with the advent of the Infrared Space Observatory detailed spectra of the circumstellar dust have become available, modelling of these spectra alone, without spatial information, may still result in ambiguous results. In this paper we illustrate certain degeneracies in the ...

The modular-type polyketide synthase (PKS) that is involved in aureothin (aur) biosynthesis represents one of the first examples in which a single PKS module (AurA) is used in an iterative fashion. Here we report on the heterologous expression of an engineered AurAB fusion protein that unequivocally proves the iterative nature of ...

Combined spectral energy distribution curves of six Ae/Be stars (BD+61 deg 154, AB Aur, V380 Ori, HD

Context. A crucial issue in star formation is to understand the physical mechanism by which mass is accreted onto and ejected by a young star. To derive key constraints on the launching point of the jets and on the geometry of the winds, the visible spectro-polarimeter VEGA installed on the CHARA optical array can be an efficient means of probing the structure and the kinematics of the hot ...

Aims: We aim at using the long baselines of the VLT Interferometer and the mid-IR combiner MIDI (8-13 ?m) to derive the morphology of the protoplanetary disk surrounding the Herbig Ae star AB Aurigae Methods: We present the first N-band analysis of AB Aur performed with a maximum angular resolution of 17 mas (2.5 AU at the ...

The Herbig Ae star, AB Aur, is believed to be a pre-main-sequence star, a higher mass counterpart of the T Tauri stars. It is the brightest (by 2-3 mags.) of the known Ae stars. AB Aur shows variable emission at Ca II K and HeI 5876 (Praderie et al. 1982). This emission may arise in an active chromosphere. Strong ...

We report results of H-band (? = 1.65?m) imaging observations of young intermediate-mass stars using the Subaru 8.2-m Telescope with the adaptive optics AO36 and the infrared coronagraph CIAO. The targets consist of 16 Herbig Ae/Be stars (15 Herbig Ae stars and one Herbig Be star) and four additional main-sequence stars with infrared excesses. Five protoplanetary disks have been ...

Intensive long-term photometric observations of the archetypical young G2 IIIe stellar object SU Aurigae are analyzed to determine many of its photometric and physical properties. Combining nearly 2000 Str�mgren uvby measures obtained using the 0.8 m Four College Automatic Photoelectric Telescope, previously published photometry, and recently obtained high-resolution echelle spectra has led to ...

The 10 ?m silicate feature is an essential diagnostic of dust-grain growth and planet formation in young circumstellar disks. The Spitzer Space Telescope has revolutionized the study of this feature, but due to its small (85 cm) aperture, it cannot spatially resolve small/medium-separation binaries (lsim3''; <~ 420 AU) at the distances of the nearest star-forming regions ...

Aims: Very few molecular species have been detected in circumstellar disks surrounding young stellar objects. We are carrying out an observational study of the chemistry of circumstellar disks surrounding T Tauri and Herbig Ae stars. First results of this study are presented in this note. Methods: We used the EMIR receivers recently installed at the IRAM 30 m telescope to carry out a sensitive ...

IUE satellite monitoring of the Herbig Ae star AB Aur in 1982 and 1984, with attention to the variability of both the Mg II 2795 A wind profile and a number of Fe II UV lines, has indicated temporal variations in the Mg II blue wing velocity by 30-50 percent at both epochs. By contrast, the Fe II spectrum was constant in 1982, but variable in 1984. There ...

MUSICOS 1996 campaign was held in Nov. 15 - Dec. 2. Five telescopes were involved in this campaign, 1.93m telescope at Haute-Provence Observatory, INT at La Palma, 2.1m telescope at McDonald Observatory, CFHT at Hawaii and 2.16m telescope at Xinglong Station of Beijing Astronmical Observatory. Four targets, SU Aur, AB Aur, xi Per and ...

The H-alpha, He I 5876 A, Na I 5890 A, Ca II IR triplet, and P14-P16 Paschen lines of AB Aur are all brighter than the nearby continuum. The emission lines are examined with regard to their origin as either recombination or chromospheric emission. While He I and H-alpha could be formed simultaneously by recombination under certain circumstances, a deep ...

We present comprehensive models for the Herbig Ae stars MWC 275 and AB Aur that aim to explain their spectral energy distribution (from UV to millimeter) and long-baseline interferometry (from near-infrared to millimeter) simultaneously. Data from the literature, combined with new mid-infrared (MIR) interferometry from the Keck Segment Tilting Experiment, ...

emitting synchrotron radiation in a magnetic field. Key words: Stars: pre�main sequence � Stars: mass loss � Stars: magnetic field � Stars: radio radiation of � Radio continuum 1 #12; 1 Introduction The Herbig Ae masses (Herbig, 1960; Strom et al., 1972; Cohen and Kuhi, 1979; Finkenzeller and Mundt, 1984

Extensive research has been done on the evolution of young low mass T Tauri stars (TTS), and a paradigm has been developed that successfully explains how the star grows by the accretion of matter from a circumstellar disk. It is currently a matter of debate whether or not the same paradigm can be applied to the higher mass counterpart Herbig Ae stars. In this dissertation, I propose to address ...

Observations by IUE of the short-term variability of the Mg II and Ca II resonance lines in the Herbig Ae star HD 163296 are presented. Evidence that these lines show a phenomenon of rotational modulation, similar to the one observed in AB Aur, another He...

Young stars can produce X-rays by different mechanisms: Coronal activity, accretion shocks and shocks in outflows. We propose to observe two targets within one field-of-view (FOV): SU Aur is accreting mass from a disk and shows violent coronal activity. We will study the time evolution of stellar flares on time scales from seconds to minutes using the high count rate in the ...

... In AB Watson (ed.). Digital images and human vision. MIT Press, Cambridge, MA. ... 18. Solomon, JA, Watson, AB & Morgan, MJ (1999). ...

Aims: We investigate the properties of the X-ray emitting plasma of the classical T Tauri star SU Aurigae and of other sources in the field of view. Methods: We use XMM-Newton to obtain a high-resolution RGS spectrum of SU Aur as well as EPIC imaging data and low-resolution spectra of the star and of other X-ray sources in the surrounding field. We reconstruct the emission ...

Numerical radiative-transfer models are used to discuss the properties of circumstellar dust grains around the premain-sequence star AB Aur (HD 31293). It is assumed that the dust consists of a silicate-graphite mixture with Draine and Lee (1984) optical properties. The modeling technique is to match the observed FUV through FIR energy distribution with ...

The Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS) is a large survey which will be observing roughly 200 protoplanetary and debris disk systems over the next five years using the HiCIAO coronagraph + AO188 system on the Subaru telescope. We present new J-band polarimetric differential imagery of the proto-type Herbig Ae star, AB Aurigae, which diagnoses ...

Aims: We present mid-infrared observations and photometry of the transitional disks around the young stellar objects DH Tau, DM Tau, and GM Aur, obtained with VISIR/VLT in N band. Our aim is to resolve the inner region and the large-scale structures of these transitional disks, carrying potential signatures of intermediate or later stages of disk evolution and ongoing planet ...

The distribution of 255 O-B9-A2, K-G stars and interstellar dust in the direction of the stellar cluster NGC 1893 is studied using V, B-V, and U-B photometric data. Sixteen groups of stars (associations) are discovered at various distances. The first group includes 9 stars of different spectral classes of later types in the Sun's neighborhood lying at a distance of 110pc. The next 3 groups, at ...

fields for which that product is available. STARE Fields Aur0 Per0 Peg0 Boo0 Cyg0 Aur1 Boo1 Cyg1 Data Products Master Starlists STARE Variable Star Database (currently Aur0 only)...

... on the population dynamics of Pyrenean grey partridge Perdix perdix hispaniensisAur�lien Besnarda,, Claude Novoab, and Olivier Gimenezc aAur�lien ... Corresponding author: Aur�lien Besnard Abstract The g...

Planetary systems are born in circumstellar disks around young stellar objects (YSOs) and the disk is thought to play a major role in the evolution of planetary systems. A good understanding of disk structure and its time evolution is therefore essential in comprehending planet formation, planet migration and the diversity of planetary systems. In this thesis, I use high angular resolution ...

It has been demonstrated that increases in poly(ADP-ribose) polymerase (PARP) activity causes damage to several organs under ischemia/reperfusion (I/R) conditions. The aims of this study were to investigate whether inhibition of PARP could suppress apoptosis in the bladder following acute urinary retention (AUR) and subsequent bladder emptying. Twelve-week-old male Sprague ...

We report high-resolution 1.6 ?m polarized intensity (PI) images of the circumstellar disk around the Herbig Ae star AB Aur at a radial distance of 22 AU (0farcs15) up to 554 AU (3farcs85), which have been obtained by the high-contrast instrument HiCIAO with the dual-beam polarimetry. We revealed complicated and asymmetrical structures in the inner part ...

The Herbig Ae variable, AB Aur, has been observed with the CFHT coude spectrograph at 95 mA resolution for five consecutive nights in the blue spectral region and with the IUE satellite in the high resolution, long wavelength mode. The Ca II K line shows an asymmetric and variable profile and shows weak emission in the absorption core at least some of the ...

... the mechanism by which Cas proteins activate AurA, and determine if drug-mediated inactivation of AurA inhibits Cas promotion of aneuploidy. ...

Aurora kinases possess a conserved catalytic domain (CD) and a N-terminal domain (ND) that varies in size and sequence. We have previously reported that the N-terminal domain of AuroraA (AurA) participates in the localization of the kinase to the centrosome in interphase. AuroraB (AurB) is a chromosome passenger protein and its N-terminal domain is not ...

Aims: We present mid-infrared observations and photometry of the transitional disks around the young stellar objects DH Tau, DM Tau, and GM Aur, obtained with VISIR/VLT in N band. Our aim is to resolve the inner region and the large-scale structures of these transitional disks, carrying potential signatures of intermediate or later stages of disk evolution and ongoing planet ...

(qx , qy ) cylinder susceptibility �cnt �0 cnt + �0 cntvcnt � dashed: graphene solid: graphene ribbon-Mode Decomposition Spatially-Resolved EELS: Graphene Towards Ab-Initio Calculations #12;Outline Introduction Electron Normal-Mode Decomposition Spatially-Resolved EELS: Graphene Towards Ab-Initio ...

Based on morphological characters, the North African Silene patula has been divided into two subspecies, ssp. patula found North of Kabylies and Atlas Mountains, and ssp. amurensis found south of these regions. In order to test the hypothesis that S. patula could have derived from S. italica through the Sicilian Channel during the Messinian, we sequenced three chloroplast loci, trnH-psbA, ...

We present new adaptive optics echelle spectra of the near-infrared [Fe II] lines in the redshifted and blueshifted jets from the T Tauri star RW Aur. The spectra have an unprecedented combination of high spatial and spectral resolution that makes it possible to trace the dynamics of the flow to a projected distance of only 10 AU from the source. As noted ...

We present new adaptive optics echelle spectra of the near-infrared [Fe II] lines in the redshifted and blueshifted jets from the T Tauri star RW Aur. The spectra have an unprecedented combination of high spatial and spectral resolution that makes it possible to trace the dynamics of the flow to a projected distance of only 10 AU from the source. As noted ...

... Uihlein, III, and A.B. Elliott. 2006. A spatially explicit decision support ... palustris Mill.) savannas and forests of the southeastern USA: status and ... ...

cdtAB 1dfnAB 1d2hAB 1c1yAB 1kbaAB 1ef7AB 1axcAC 1b77AB 1kklAH Discoidin domain Snake venom toxins Defensin Glycine N-methyltransferase G proteins Snake venom toxins Papain-like DNA polymerase processivity factor DNA polymerase processivity factor HPr ...

We present new results of [Fe II] ?1.644 ?m spectroscopy toward the jets from HL Tau and RW Aur carried out with the Subaru Telescope combined with the adaptive optics system. We observed the regions within 2"-3" from the stars with the subarcsecond resolutions of 0.5" and 0.2" for HL Tau and RW Aur, respectively. In addition to the strong high-velocity ...

of the amplified EFGR genes, which revealed that they are often mutated or rearranged to generate a protein

Spatially explicit identification of status and changes in environmental conditions over large, regional areas is key to targeting and prioritizing areas for potential further study and environmental protection and restoration. A critical limitation to this point has been our ab...

The Strategic Exploration of Exoplanets and Disks with Subaru (SEEDS) is a large survey which will be observing roughly 200 protoplanetary and debris disk systems over the next five years using the HiCIAO coronagraph + AO188 system on the Subaru telescope. We present new J-band polarimetric differential imagery of the proto-type Herbig Ae star, AB Aurigae, which diagnoses ...

Radial velocity measurements and sine-curve fits to the orbital velocity variations are presented for the eighth set of 10 close binary systems: AB And, V402 Aur, V445 Cep, V2082 Cyg, BX Dra, V918 Her, V502 Oph, V1363 Ori, KP Peg, and V335 Peg. Half of the systems (V445 Cep, V2082 Cyg, V918 Her, V1363 Ori, and V335 Peg) were discovered photometrically by ...

When 2 targets are embedded in a rapid serial visual presentation stream of distractors, perception of the second target is impaired when the intertarget lag is relatively short (less than 500 ms). Stimuli concurrently presented with the stream can affect this phenomenon, which is called attentional blink (AB). Previous studies have yielded conflicting results concerning the ...

Accurate solutions of the Ginzburg-Landau equations describing the A-B phase boundary for a planar interface between /sup 3/He-A and /sup 3/He-B are calculated near the tricritical pressure and classified in terms of simple discrete symmetries. The order-parameter components of the A-B phase boundary and the interfacial energy sigma/sub ...

Research on the transmission of infectious diseases amongst the human population at fine scales is limited. At this level, the dynamics of humans are determined by their social activities and the physical condition of the environment. Raster space AB (activity bundle) simulation is a method to simulate humans' contacts within a space under the framework of an individual ...

Centrosomes are primary microtubule (MT)-organizing centers (MTOCs). During mitosis, they dramatically increase their size and MT-nucleating activity and participate in spindle assembly from spindle poles. These events require the serine/threonine kinase, Aurora A (AurA), and the centrosomal protein of 192 kDa (Cep192)/spindle defective 2 (Spd-2), but the underlying mechanism ...

Three experiments tested human participants on a two-dimensional, computer, landmark-based search task to assess the integration of independently acquired spatial and temporal relationships. Experiment 1 showed that A�B spatial training followed by B�outcome spatial training resulted in ...

Program Hae2BPIC resulted in usable ISO spectra of three young, Herbig Ae stars: HR 5999 (A7e, t=0.6 Myr), SV Cep (al-2e, t=1-3 Myr), and MW Vul (Al-2e, t=1-3 Myr). While too small a sample to pursue our original goal of surveying the silicate emission in these young, protoplanetary disk systems, comparison of these data with ground-based IR spectra, and published ISO observations of other HAe ...

Oncogenic hyperactivation of the mitotic kinase Aurora-A (AurA) in cancer is associated with genomic instability. Increasing evidence indicates that AurA also regulates critical processes in normal interphase cells, but the source of such activity has been obscure. We report here that multiple stimuli causing release of Ca²⁺ from ...

: The semi-arid region of the Aur�s presents a diversity of flora and fauna undeniable, however weather conditions and actual adverse anthropogenic, caused degradation of the physical environment, which takes the form of a decline in he natural forest cover. The objective of this study is to determine the contribution of satellite images in detecting changes in land use ...

... THE NATIONAL MILITARY STRATEGY OF 1864, WHO WAS THE AurHOR? ... The National Military Strategy of 1864, Who Was the Author? ...

The note confirms the older work on the velocity variations of the components of U Oph and beta Aur.

A semiempirical model for the wind in four Zeta Aur binary systems is developed, basing the analyses

Site-directed mutagenesis based on the crystal structure of AurF, a nitro group forming monooxygenase from Streptomyces thioluteus, revealed that AurF variants are capable of selectively transforming guanidyl- and amidinyl-substituted anilines into the corresponding nitro compounds. Our results provide new insights into the biochemical basis of ...

BackgroundStaphylococcus aureus expresses several proteases, which are thought to contribute to the virulence of this bacterium. Here we focus on aureolysin, the major thermolysin-like metalloprotease. Despite the importance of aureolysin in the physiology and pathogenesis of S. aureus, relatively little information was so far available concerning the aur gene diversity and ...

. In a black hole with a positive cosmological constant we can de#12;ne another kind of event horizon. A cosmological event horizon is de#12;ned as the boundary of the region from which light can never reach relation on a spatial compact 3-surface S with frontier @S we obtain: I @S k a;b df ab = Z S R a b k b d

A theoretical model of Thomson scattering in a magnetized plasma, taking spatial dispersion into account, is developed ab initio. The resulting expressions allow thermal motion to be included in the description of the plasma and remain valid for frequenci...

Mar 7, 2008 ... indicators are the frequency centroids and widths, NEdT at 250 K and 300 K, spatial centroids,. AB-weight, Spec_qual, n3sigma and npops. ...

of the visual binary a Gem (= Castor A+B). Each component ... detect a source at the position of Castor A, but not at Castor B. Our X-ray observations ...

compiled within the GHOST project (Kim et al., 2004a,b) ... GHOST > Global Holocene Spatial and Temporal Climate Variability � Supplemental Info ...

The objective of this study is to create maps of land cover from satellite images taken at different times to analyze and translate the different states of the dynamics of land use by vegetation in the Aures region Methodology is based on analysis by remote sensing tools of two satellite images: Landsat 1990 and Alsat 2001. To better characterize the evolution of the land and ...

We propose to observe an eclipse of the Zeta Aurigae-type binary HR2554 using the GHRS. Every 195 days the A1 dwarf secondary passes behind the outer atmosphere of the G6 II primary and can be used as light source to observe absorption lines from plasma in the G star atmopshere. The G star has a hybrid-chromosphere structure with hot transition region plasma and a cool stellar wind. THESE ...

We propose to observe an eclipse of the Zeta Aurigae-type binary HR2554 using the GHRS. Every 195 days the A1 dwarf secondary passes behind the outer atmosphere of the G6 II primary and can be used as light source to observe absorption lines from plasma in the G star atmopshere. The G star has a hybrid-chromosphere structure with hot transition region plasma and a cool stellar wind. THESE ...

We present the result of ab initio modeling of the Ge(111)-(2 � 1) surface electronic structure in the presence of donor doping atom at certain position in the surface bilayer of (2 � 1) reconstruction. We briefly compare these results with the data of experimental low temperature STM investigations. Ab initio calculations demonstrate that doping atom ...

The attentional blink (AB) refers to the finding that performance on the second of two targets (T1 and T2) in a rapid serial visual presentation (RSVP) stream is impaired when the targets are presented within 200�500�ms. To explore the possible interaction between spatial attentional orienting and temporary attentional deficits, this study used central ...

The Aharonov-Bohm (A-B) effect provides direct proof that the charged fermion fields are directly coupled to the gauge 4-vector potential. In this work the A-B effect is studied by means of the relativistic time-dependent Dirac equation coupled with static, external electromagnetic potentials. The staggered leap-frog numerical method is used and proven to ...

A general expression has been derived from a statistical model, which takes account of the onservation of angular momentum, in addition to energy and linear momentum, for the initial non-equilibrium distribution of vibrational-rotational populations of the diatomic species AB resulting from the molecular splitting: [ABCD]to AB+C+D. Numerical calculations ...

The protective effect of antibodies (Abs) is generally attributed to neutralization or complement activation. Using Legionella pneumophila and Mycobacterium bovis bacillus Calmette�Gu�rin as a model, we discovered an additional mechanism of Ab-mediated protection effective against intracellular pathogens that normally evade lysosomal fusion. We show ...