Studies of late-type dwarfs. V. Theoretical models for lower main-sequence stars
New theoretical stellar models for the lower end of the main sequence have been computed for a wide range in metallicity. These models are based on new low-temperature opacities, which include the contributions from the most important molecules, as well as published model atmospheres, which guided the choice of surface boundary conditions. While our treatment of the nonideal gas effects is only approximate, we find reasonable agreement with those models computed with a more sophisticated equation of state for solar-like composition. The results are compared with the available observations of late-type dwarfs on both the (M/sub bol/, logT/sub eff/) - and (M/sub bol/, mass)-planes, and satisfactory agreement is found. In particular, some preliminary observational data appear to be consistent with the model prediction that the most metal-poor subdwarfs should be up to 3 mag subluminous on the theoretical H-R diagram.
- OSTI ID:
- 5851916
- Journal Information:
- Astrophys. J.; (United States), Vol. 266:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
The late-M dwarfs
THE BROWN DWARF KINEMATICS PROJECT (BDKP). III. PARALLAXES FOR 70 ULTRACOOL DWARFS
Related Subjects
GENERAL PHYSICS
MAIN SEQUENCE STARS
CHEMICAL COMPOSITION
STAR MODELS
DWARF STARS
HERTZSPRUNG-RUSSELL DIAGRAM
LUMINOSITY
MASS
OPACITY
STAR EVOLUTION
STELLAR ATMOSPHERES
ATMOSPHERES
DIAGRAMS
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources