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

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

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..735i&link_type=abstract

Astronomy and Astrophysics, v.302, p.735

Astronomy and Astrophysics

Astrophysics

26

Stars: Chemically Peculiar, Stars: Early-Type, Stars: Fundamental Parameters, Hertzsprung-Russell Diagram

Scientific paper

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 10^7^ and 10^9^ 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.

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