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A Large Stellar Evolution Database for Population Synthesis Studies. I. Scaled Solar Models and Isochrones
Salaris, Maurizio; Cassisi, Santi; Pietrinferni, Adriano +1 more
We present a large and updated stellar evolution database for low-, intermediate-, and high-mass stars in a wide metallicity range, suitable for studying Galactic and extragalactic simple and composite stellar populations using population synthesis techniques. The stellar mass range is between ~0.5 and 10 Msolar with a fine mass spacing…
Disk and Halo Wide Binaries from the Revised Luyten Catalog: Probes of Star Formation and MACHO Dark Matter
Gould, Andrew; Chanamé, Julio
We present a catalog of 1147 candidate common proper motion binaries selected from the revised New Luyten Two-Tenths Catalog (NLTT). Among these, we identify 999 genuine physical pairs using the measured proper-motion difference and the relative positions of each binary's components on a reduced proper motion (RPM) diagram. The RPM positions also …
A Period and a Prediction for the Of?p Spectrum Alternator HD 191612
Corcoran, Michael F.; Walborn, Nolan R.; Bond, Howard E. +7 more
The observational picture of the enigmatic O-type spectrum variable HD 191612 has been sharpened substantially. A symmetrical, low-amplitude light curve with a period near 540 days has recently been reported from Hipparcos photometry. This period satisfies all of the spectroscopy since at least 1982, including extensive new observations during 200…
The Enigmatic Radio Source T Tauri S
Hummel, C. A.; Thomasson, P.; Johnston, K. J. +4 more
We have observed the T Tau multiple star system using the Multielement Radio-linked Interferometer Network at a frequency of 5 GHz. The compact centimeter wavelength radio emission from T Tau S has been found to consist of at least two components separated by approximately 70 mas in right ascension at Julian epoch 2001.89. Using this data and that…
A Substellar Companion to van Maanen 2
Makarov, Valeri V.
The Hipparcos data for the nearest white dwarf van Maanen 2 (=HIP 3829; distance of 4.4 pc) indicate astrometric binarity, in that the proper motion has a large first derivative not accounted for as a perspective acceleration due to changing distance. The presence of a companion was suspected, but never demonstrated, from the pre-Hipparcos astrome…
Limits on I-Band Microvariability of the Galactic Bulge Mira Variables
McGowan, K. E.; Vestrand, W. T.; Woźniak, P. R.
We search for microvariability in a sample of 485 Mira variables with high-quality I-band light curves from the second-generation Optical Gravitational Lensing Experiment (OGLE-II). Rapid variations with amplitudes in the ~0.2-1.1 mag range lasting hours to days were discovered in Hipparcos data by de Laverny et al. Our search is primarily sensiti…