Constraints on the Low-Energy Cutoff in the Electron Distribution of the PKS 0637-752 JetWe re-analyze the Chandra ACIS spectrum of the kpc-scale jet in PKS 0637-752 to investigate the possible low energy cutoff in the relativistic electron spectrum producing the non-thermal radiation in…M. Mueller, D. A. Schwartz·Nov 18, 2008SaveLearn
Young stars and clouds in CamelopardalisStar formation in the Local spiral arm in the direction of the Galactic longitudes 132--158 deg is reviewed. Recent star-forming activity in this Milky Way direction is evidenced by the presence here…V. Straizys, V. Laugalys·Nov 18, 2008SaveLearn
The Primordial Helium AbundanceI present a brief review on the determination of the primordial helium abundance by unit mass, Yp. I discuss the importance of the primordial helium abundance in: (a) cosmology, (b) testing the…Manuel Peimbert·Nov 18, 2008SaveLearn
Spectrum of two component flows around a super-massive black hole: an application to M87We calculate the spectra of two-component accretion flows around black holes of various masses, from quasars to nano-quasars. Specifically, we fit the observational data of M87 very satisfactorily…Samir Mandal, Sandip K. Chakrabarti·Nov 18, 2008SaveLearn
Blue Stragglers After the Main SequenceWe study the post-main sequence evolution of products of collisions between main sequence stars (blue stragglers), with particular interest paid to the horizontal branch and asymptotic giant branch…Alison Sills, Amanda Karakas, John Lattanzio·Nov 18, 2008SaveLearn
Modelling the broad-band spectra of X-ray emitting GPS galaxiesThe study of the broad-band emission of GHz-Peaked-Spectrum (GPS) radio galaxies is a powerful tool to investigate the physical processes taking place in the central, kpc-sized region of their active…L. Ostorero, R. Moderski, L. Stawarz et al.·Nov 18, 2008SaveLearn
Multi-wavelength X-ray/mid-infrared observations of GRS 1915+105We report preliminary results of mid-infrared (MIR) and X-ray observations of GRS 1915+105 that we carried out between 2004 October 2 and 2006 June 5. Our main goals were to study its variability, to…F. Rahoui, S. Chaty, J. Rodriguez et al.·Nov 18, 2008SaveLearn
The Ages of Stars: The Horizontal BranchHorizontal branch (HB) stars play a particularly important role in the "age debate," since they are at the very center of the long-standing "second parameter" problem. In this review,…M. Catelan·Nov 18, 2008SaveLearn
Peculiarities in the stellar velocity distribution of galaxies with a two-armed spiral structureWe expand our pervious numerical study of the properties of the stellar velocity distribution within the disk of a two-armed spiral galaxy by considering spiral stellar density waves with different…E. I. Vorobyov, Christian Theis·Nov 18, 2008SaveLearn
Comments on "The long-period Galactic Cepheid RS Puppis. I. A geometric distance from its light echoes"The luminous Galactic Cepheid RS Puppis is unique in being surrounded by a dust nebula illuminated by the variable light of the Cepheid. In a recent paper in this journal, Kervella et al. (2008)…Howard E. Bond, William B. Sparks·Nov 18, 2008SaveLearn
Discovery of an eccentric 30 days period in the supergiant X-ray binary SAX J1818.6-1703 with INTEGRALSAX J1818.6-1703 is a flaring transient X-ray source serendipitously discovered by BeppoSAX in 1998 during an observation of the Galactic centre. The source was identified as a High-Mass X-ray Binary…J. A. Zurita Heras, S. Chaty·Nov 18, 2008SaveLearn
DAOSPEC: an automatic code for measuring equivalent widths in high-resolution stellar spectraDAOSPEC is a Fortran code for measuring equivalent widths of absorption lines in stellar spectra with minimal human involvement. It works with standard FITS format files and it is designed for use…P. B. Stetson, E. Pancino·Nov 18, 2008SaveLearn
Extremely Compact Massive Galaxies at 1.7<z<3We measure and analyse the sizes of 82 massive (M >= 1011 MSun) galaxies at 1.7<z<3 utilizing deep HST NICMOS data taken in the GOODS North and South fields. Our sample provides the first…Fernando Buitrago, Ignacio Trujillo, Christopher J. Conselice·Nov 18, 2008SaveLearn
The Apparent "Angular Size - Frequency" Dependence in ~3000 Parsec-scale Extragalactic JetsThe upper envelope of the amplitude of the VLBI visibility function usually represents the most compact structural pattern of extragalactic radio sources, in particular, the "core-jet"…J. Yang, L. I. Gurvits, S. Frey et al.·Nov 18, 2008SaveLearn
Metallicities and Radial Velocities of Five Open Clusters Including a New Candidate Member of the Monoceros StreamNear infrared spectra of 133 red giant stars from ten Galactic open clusters and two Galactic globular clusters spanning 2.2 dex in metallicity and 11 Gyr in age are presented. We combine this sample…Steven R. Warren, Andrew A. Cole·Nov 18, 2008SaveLearn
The DMTPC detectorDirectional detection of Dark Matter allows for unambiguous direct detection of WIMPs as well as discrimination between various Dark Matter models in our galaxy. The DMTPC detector is a low-pressure…G. Sciolla, J. Battat, T. Caldwell et al.·Nov 18, 2008SaveLearn
Unifying disc-jet behaviour in X-ray binaries: an optical/IR approachSynchrotron emission from jets produced by X-ray binaries can be detected at optical and infrared (IR) frequencies. I show that optical/IR colour-magnitude diagrams of the outbursts of nine X-ray…David M. Russell, Dipankar Maitra, Rob P. Fender et al.·Nov 18, 2008SaveLearn
Stellar ages from asteroseismologyAsteroseismology provides powerful means to probe stellar interiors. The oscillations frequencies are closely related to stellar interior properties via the density and sound speed profiles. Since…Yveline Lebreton, Josefina Montalban·Nov 18, 2008SaveLearn
Lithium abundances in exoplanet-host stars : modellingAims. Exoplanet-host stars (EHS) are known to present superficial chemical abundances different from those of stars without any detected planet (NEHS). EHS are, on the average, overmetallic compared…M. Castro, S. Vauclair, O. Richard et al.·Nov 18, 2008SaveLearn
Detection of Dense Molecular Gas in Inter-Arm Spurs in M51Spiral arm spurs are prominent features that have been observed in extinction and 8μm emission in nearby galaxies. In order to understand their molecular gas properties, we used the Owens Valley…S. A. Corder, K. Sheth, N. Z. Scoville et al.·Nov 18, 2008SaveLearn
Interstellar Extinction and Long-Period Variables in the Galactic CenterWe use the Spitzer IRAC catalogue of the Galactic Center (GC) point sources (Ramirez et al. 2008) and combine it with new isochrones (Marigo et al. 2008) to derive extinctions based on photometry of…M. Schultheis, K. Sellgren, S. Ramirez et al.·Nov 18, 2008SaveLearn
Planets in Stellar Clusters Extensive Search. V. Search for planets and identification of 18 new variable stars in the old open cluster NGC 188We have undertaken a long-term project, Planets in Stellar Clusters Extensive Search (PISCES), to search for transiting planets in open clusters. In this paper we present the results for NGC 188, an…B. J. Mochejska, K. Z. Stanek, D. D. Sasselov et al.·Nov 18, 2008SaveLearn
N-body simulations in modified Newtonian dynamicsWe describe some results obtained with N-MODY, a code for N-body simulations of collisionless stellar systems in modified Newtonian dynamics (MOND). We found that a few fundamental dynamical…Carlo Nipoti, Pasquale Londrillo, Luca Ciotti·Nov 18, 2008SaveLearn
Performance of the Imaging Fourier Transform Spectrometer with Photoconductive Detector Arrays: An Application for the AKARI Far-Infrared InstrumentWe have developed an imaging Fourier transform spectrometer (FTS) for space-based far-infrared astronomical observations. The FTS employs a newly developed photoconductive detector arrays with a…Mitsunobu Kawada, Hidenori Takahashi, Noriko Murakami et al.·Nov 18, 2008SaveLearn
Three-dimensional numerical simulations of the pulsar magentoshere: Preliminary resultsWe investigate the three-dimensional structure of the pulsar magnetosphere through time-dependent numerical simulations of a magnetic dipole that is set in rotation. We developed our own Eulerian…Constantinos Kalapotharakos, Ioannis Contopoulos·Nov 18, 2008SaveLearn