Behaviour of the O I triplet at lambda 7773. III. AM stars.
Abstract
The behavior of the O I triplet at 7773 A in a sample of Am stars is analyzed and compared to results previosly obtained for normal stars. The oxygen abundance derived from this triplet appears to be very sensitive to the value of the microburbulence parameter and to NLTE effects. With the adopted microburbulent velocities, an underabundance of up to a factor of 10 is found for this sample of Am stars.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1989
- Bibcode:
- 1989A&A...224..171V
- Keywords:
-
- A Stars;
- Atomic Energy Levels;
- Oxygen Spectra;
- Peculiar Stars;
- Stellar Composition;
- Stellar Spectra;
- Magnetohydrodynamic Turbulence;
- Thermodynamic Equilibrium;
- Astrophysics