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19912026
Showing 2000 · astro-phShow all

13 papers · 2 filters

astro-ph2000★ 404 cited

Photometric and Spectroscopic Analysis of Cool White Dwarfs with Trigonometric Parallax Measurements

P. Bergeron, S. K. Leggett, Maria Teresa Ruiz

A photometric and spectroscopic analysis of 152 cool white dwarf stars is presented. The discovery of 7 new DA white dwarfs, 2 new DQ white dwarfs, 1 new magnetic white dwarf, and…

astro-ph2000

The Impact of External Tidal Fields on the ISM of Dwarf Spheroidals

Sergey Mashchenko, Claude Carignan

It was found that for three dwarf spheroidal galaxies - Sculptor, Tucana, and Cetus - there is a correspondence between the distribution of associated HI gas and the projected tida…

astro-ph2000

A near-IR [Fe II] line imaging survey of supernova remnants in M33

T. Morel, R. Doyon, N. St-Louis

We report on the first near-IR [Fe II] line imaging survey of extragalactic SNRs. Observations of a sample of 42 objects drawn from an optically-selected catalogue of SNRs in M33 p…

astro-ph2000★ 74 cited

Physical parameters of erupting Luminous Blue Variables: NGC 2363-V1 caught in the act

L. Drissen, P. A. Crowther, L. J. Smith +3

A quantitative study of the Luminous Blue Variable NGC 2363-V1 in the Magellanic galaxy NGC 2366 (D = 3.44 Mpc) is presented, based on ultraviolet and optical HST/STIS spectroscopy…

astro-ph2000★ 43 cited

Carbon Star Survey of Local Group Dwarf Galaxies. II. Pegasus, DDO 210 and Tucana

P. Battinelli, S. Demers

We present the latest results of our ongoing four filter photometric survey of C stars in Local Group dwarf irregular galaxies. Observations of the two low luminosity dwarf irregul…

astro-ph2000★ 15 cited

Coordinated Monitoring of the Eccentric O-star Binary Iota Orionis: The X-ray Analysis

Julian Pittard, Ian Stevens, Michael Corcoran +3

We analyse two ASCA observations of the highly eccentric O9III + B1III binary Iota Orionis obtained at periastron and apastron. Based on the assumption of a strong colliding winds…

astro-ph2000★ 108 cited

Cooling sequences and color-magnitude diagrams for cool white dwarfs with hydrogen-atmospheres

Gilles Chabrier, Pierre Brassard, Gilles Fontaine +1

We present new cooling sequences, color-magnitude diagrams, and color-color diagrams for cool white dwarfs with pure hydrogen atmospheres down to an effective temperature $\te=1500…

astro-ph2000★ 14 cited

The Effect of Diffusion on Pulsations of Stars on the Upper Main Sequence. delta Scuti and Metallic A Stars

S. Turcotte, J. Richer, G. Michaud +1

Recent dramatic improvements in the modeling of abundance evolution due to diffusion in A stars have been achieved with the help of monochromatic opacity tables from the OPAL group…

astro-ph2000★ 37 cited

Gauge choice and geodetic deflection in conformal gravity

A. Edery, A. A. Méthot, M. B. Paranjape

Conformal gravity has been proposed as an alternative theory of gravity which can account for flat galactic rotation curves without recourse to copious quantities of dark matter. H…

astro-ph2000★ 143 cited

Accurate Determination of the Mass Distribution in Spiral Galaxies: II. Testing the Shape of Dark Halos

Sebastien Blais-Ouellette, Philippe Amram, Claude Carignan

New high resolution CFHT Fabry-Perot data, combined with published VLA 21 cm observations are used to determine the mass distribution of NGC 3109 and IC 2574. The multi-wavelength…

astro-ph2000★ 27 cited

Magellanic Cloud Periphery Carbon Stars IV: The SMC

William Kunkel, Serge Demers, M. J. Irwin

The kinematics of 150 carbon stars observed at moderate dispersion on the periphery of the Small Magellanic Cloud are compared with the motions of neutral hydrogen and early type s…

astro-ph2000★ 21 cited

Galactic Worm 123.4-1.5: A Mushroom-shaped HI Cloud

Canadian Galactic Plane Survey, :, Jayanne English +5

The Dominion Radio Astrophysical Observatory's Synthesis Telescope provides the highest resolution data (1 arcmin and 0.82 km/s) to date of an HI worm candidate. Observed as part o…

astro-ph2000★ 151 cited

Propagation of ultra-high energy protons in the nearby universe

Todor Stanev, Ralph Engel, Anita Muecke +2

We present a new calculation of the propagation of protons with energies above eV over distances of up to several hundred Mpc. The calculation is based on a Monte Carlo a…