Science Archives Publication System

An Inverse Look at the Center of M15

DOI: 10.1086/501433 Bibcode: 2006AJ....131.2561C

Chakrabarty, Dalia

The observed radial and transverse velocities of individual stars in the globular cluster M15 are used as inputs to a fully nonparametric code (CHASSIS) in order to estimate the equilibrium stellar distribution function and the three-dimensional mass density profile, from which are estimated the mass-to-light ratio, enclosed mass, and velocity dis…

2006 • The Astronomical Journal

eHST 10

On the Mass Distribution of Stars in the Solar Neighbourhood

DOI: 10.2298/SAJ0672017N Bibcode: 2006SerAJ.172...17N

Ninkovic, S.; Trajkovska, V.

The present authors analyse samples consisting of Hipparcos stars. Based on the corresponding HR diagrams they estimate masses of Main-Sequence stars from their visual magnitudes. They find that already beyond the heliocentric radius of 10 pc the effects of observational selection against K and M dwarfs become rather strong. For this reason the au…

2006 • Serbian Astronomical Journal

Hipparcos 10

Solar gravity modes: Present and future

DOI: 10.1016/j.asr.2005.08.003 Bibcode: 2006AdSpR..37.1569T

Turck-Chièze, Sylvaine

Gravity modes are the best probes to study the solar radiative zone dynamics, especially in the nuclear core. These modes remain difficult to observe, but they are essential ingredients for progressing on the evolution of the Sun-Earth relationship at the level of centuries. Today, the knowledge of the internal dynamics comes from acoustic modes a…

2006 • Advances in Space Research

SOHO 10

On the Nature of the Ultraluminous X-Ray Transient in Cen A (NGC 5128)

DOI: 10.1086/498011 Bibcode: 2006ApJ...640..459G

Wu, Kinwah; Tennant, Allyn F.; Swartz, Douglas A. +2 more

We combine nine ROSAT, nine Chandra, and two XMM-Newton observations of the Cen A galaxy to obtain the X-ray light curve of 1RXH J132519.8-430312 (=CXOU J132519.9-430317) spanning 1990-2003. The source reached a peak 0.1-2.4 keV flux F_X>10^-12 ergs cm^-2 s^-1 during a 10 day span in 1995 July. The inferr…

2006 • The Astrophysical Journal

XMM-Newton eHST 10

Iron Depletion in the Hot Bubbles in Planetary Nebulae

DOI: 10.1086/499218 Bibcode: 2006ApJ...639..185G

Zhekov, Svetozar A.; Richer, Michael G.; Arrieta, Anabel +1 more

We have searched for the emission from [Fe X] λ6374 and [Fe XIV] λ5303 that is expected from the gas emitting in diffuse X-rays in BD +30°3639, NGC 6543, NGC 7009, and NGC 7027. Neither line was detected in any object. Models that fit the X-ray spectra of these objects indicate that the [Fe X] λ6374 emission should be below our detection threshold…

2006 • The Astrophysical Journal

XMM-Newton 10

Gamma-ray constraints on the infrared background excess

DOI: 10.1016/j.newast.2005.10.007 Bibcode: 2006NewA...11..420M

Salvaterra, R.; Ferrara, A.; Mapelli, M.

Motivated by the idea that the recently detected near-infrared (1.2-4 µm) excess over the contribution of known galaxies is due to redshifted light from the first cosmic stars [MNRAS 339 (2003) 973], we have used the effect caused by photon-photon absorption on gamma-ray spectra of blazars to put constraints on extragalactic background light…

2006 • New Astronomy

eHST 10

The hosts and environments of local ULIRGs and QSOs

DOI: 10.1016/j.newar.2006.06.078 Bibcode: 2006NewAR..50..701V

Veilleux, Sylvain

This paper reviews the recent results from a comprehensive investigation of the most luminous mergers in the local universe, the ultraluminous infrared galaxies (ULIRGs) and the quasars. First, the frequency of occurrence and importance of black hole driven nuclear activity in ULIRGs are discussed using the latest sets of optical, near-infrared, m…

2006 • New Astronomy Reviews

eHST 10

Variations of the He II λ1640 line in B0e-B2.5e stars

DOI: 10.1051/0004-6361:20065055 Bibcode: 2006A&A...459..215S

Smith, M. A.

Using the International Ultraviolet Explorer data archive, we have examined the SWP echellograms of 74 B0-B2.5e stars for statistically significant fluctuations in the He II ("Hα") λ1640 line profile. In this sample we found that the He II line is occasionally variable in 10 stars over short to long timescales. The He II-variable stars discovered …

2006 • Astronomy and Astrophysics

IUE 10

Curvelet analysis of asteroseismic data. I. Method description and application to simulated sun-like stars

DOI: 10.1051/0004-6361:20054541 Bibcode: 2006A&A...454.1021L

García, R. A.; Starck, J. -L.; Pires, S. +3 more

Context: .The detection and identification of oscillation modes (in terms of their ℓ, m, and successive n) is a great challenge for present and future asteroseismic space missions. "Peak tagging" is an important step in the analysis of these data to provide estimations of stellar oscillation mode parameters, i.e., frequencies, rotation rates, and …

2006 • Astronomy and Astrophysics

SOHO 10

ZEN and the search for high-redshift galaxies

DOI: 10.1016/j.newar.2005.11.029 Bibcode: 2006NewAR..50...70W

Kneib, Jean-Paul; Minniti, Dante; Courbin, Frédéric +1 more

We present the ZEN ( z equals nine) survey: a deep, narrow J-band search for proto-galactic Ly α emission at redshifts z ∼ 9. In the first phase of the survey, dubbed ZEN1, we combine an exceptionally deep image of the Hubble Deep Field South, obtained using a narrow-band filter centred on the wavelength 1.187 µm, with existing deep, broad b…

2006 • New Astronomy Reviews

eHST 10