SIMBAD references

1995A&A...302..735I - Astronomy and Astrophysics, volume 302, 735-740 (1995/10-3)

Mass and age determination for 21 λ Bootis-type stars.

ILIEV I.K. and BARZOVA I.S.

Abstract (from CDS):

Newly published theoretical grids of stellar models are used to evaluate masses and ages of 21 stars with proven λ Bootis characteristics. Basic input parameters as effective temperature and luminosity for each star are calculated from their uvbyβ indices. Masses thus estimated are in the range of 1.6-2.7 solar masses, the evolutionary ages are between 107 and 109 years. In terms of stellar evolution, most of the studied λ Bootis stars are in the middle of their main sequence evolution. Only a few of them are young enough to fulfill the requirements of the "diffusion/accretion" model. Masses and ages of the examined stars are compared with already published [Fe/H] data. Iron is less deficient in more massive λ Bootis stars. There is no evidence for significant change in the chemical composition of considered λ Bootis type stars during their evolution on the main sequence.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: early-type - stars: fundamental parameters - Hertzsprung-Russell diagram

Simbad objects: 22

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2020.10.20-11:37:37

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