Accurate LTE abundances of seven well established lambda Bootis stars

Details Accurate LTE abundances of seven well established lambda Bootis stars Accurate LTE abundances of seven well established lambda Bootis stars

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...351..981p&link_type=abstract

Astronomy and Astrophysics, v.351, p.981-984 (1999)

Astronomy and Astrophysics

Astrophysics

15

Stars: Abundances, Stars: Atmospheres, Stars: Chemically Peculiar, Stars: Early-Type

Scientific paper

High resolution and high signal-to-noise CCD spectra were analyzed to determine accurate LTE abundances for seven well established {lambda 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 T_eff, 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 {lambda Bootis} phenomenon. Based on observations from the Special Astrophysical Observatory of the Russian Academy of Sciences, Russia, Northern Caucasus and the McDonald Observatory

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