SpringerLink
Forum Springer Astron. Astrophys.
Forum Whats New Search Orders


Astron. Astrophys. 352, 555-562 (1999)


Table of Contents
Available formats: HTML | PDF | (gzipped) PostScript

Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures *

C. Allende Prieto and D.L. Lambert

McDonald Observatory and Department of Astronomy, The University of Texas at Austin, RLM 15.308, Austin, TX 78712-1083, USA (callende, dll@astro.as.utexas.edu)

Received 21 July 1999 / Accepted 30 September 1999

Abstract

The Hipparcos mission has made it possible to constrain the positions of nearby field stars in the colour-magnitude diagram with very high accuracy. These positions can be compared with the predictions of stellar evolutionary calculations to provide information on the basic parameters of the stars: masses, radii, effective temperatures, ages, and chemical composition. The degeneracy between mass, age, and metallicity is not so large as to prevent a reliable estimate of masses, radii and effective temperatures, at least for stars of solar metallicity. The evolutionary models of Bertelli et al. (1994) predict those parameters finely, and furthermore, the applied transformation from the theoretical ([FORMULA] [FORMULA]) to the observational ([FORMULA]-B-V) plane is precise enough to derive radii with an uncertainty of [FORMULA]%, masses within 8%, and [FORMULA]s within [FORMULA]% for a certain range of the stellar parameters. This is demonstrated by means of comparison with the measurements in eclipsing binaries and the InfraRed Flux Method.

The application of the interpolation procedure in the theoretical isochrones to the stars within 100 pc from the Sun observed with Hipparcos provides estimates for 17,219 stars.

Key words: stars: fundamental parameters – stars: luminosity function, mass function – stars: Hertzsprung – Russel (HR) and C-M diagrams – Galaxy: stellar content

* Table 1 is only available in electronic form at the CDS via anonymous ftp to: ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/352/555 (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/352/555

Send offprint requests to: C. Allende Prieto

© European Southern Observatory (ESO) 1999

Online publication: December 2, 1999

helpdesk.link@springer.de