Accurate LTE abundances of seven well established Bootis stars *
E. Paunzen 1,
S.M. Andrievsky 2,
I.V. Chernyshova 2,
V.G. Klochkova 3,
V.E. Panchuk 3 and
G. Handler 1,4
Received 4 May 1999 / Accepted 30 September 1999
High resolution and high signal-to-noise CCD spectra were analyzed to determine accurate LTE abundances for seven well established Bootis stars (a group of A to F-type stars with strong underabundances of Fe-peak elements whereas the C, N, O and S appear to be solar abundant): HD 31295, HD 125162, HD 142994, HD 149303, HD 192640, HD 204041 and HD 221756. In general, 13 elements were investigated. The effective temperatures of our program stars range from 7200 to 9000 K.
The main results are the following: C, O, Na and S seem to be nearly solar abundant for all investigated stars. A wide range of underabundances within the individual stars exists for all other elements.
No correlation of the individual abundances with astrophysical parameters such as , log g and v sin i was found.
These results are consistent with the accretion/diffusion model which is currently adopted for the explanation of the Bootis phenomenon.
Key words: stars: abundances stars: atmospheres stars: chemically peculiar stars: early-type
Send offprint requests to: E. Paunzen
© European Southern Observatory (ESO) 1999
Online publication: November 16, 1999