Accurate LTE abundances of seven well established λ Bootis stars
- Autor(en)
- Ernst Paunzen, Sergei M. Andrievsky, Irina V. Chernyshova, Valentina G. Klochkova, V E Panchuk, Gerald Handler
- Abstrakt
High resolution and high signal-to-noise CCD spectra were analyzed to determine accurate LTE abundances for seven well established λ 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 astruphysical parameters such as T, 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 λ Bootis phenomenon.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Russian Academy of Sciences, Odessa I. I. Mechnikov National University, South African Astronomical Observatory (SAAO)
- Journal
- Astronomy & Astrophysics
- Band
- 351
- Seiten
- 981-984
- Anzahl der Seiten
- 4
- ISSN
- 0004-6361
- Publikationsdatum
- 1999
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/accurate-lte-abundances-of-seven-well-established--bootis-stars(68807317-9edd-4a30-8b19-01773f6a0238).html