The carbon abundance of SdO-stars.
Abstract
High resolution International Ultraviolet Explorer spectra of the three SdO-stars HD 127493, HD 49798 and BD + 75 deg 325 were used to derive an upper limit for the carbon abundance. The C IV resonance line doublet at lambda 1548/1551 was analyzed by means of non-LTE line formation in the two level approximation. All three SdO-stars were found to be carbon-deficient by at least a factor of ten (relative to the Sun).
- Publication:
-
Ultraviolet observations of Quasars
- Pub Date:
- April 1980
- Bibcode:
- 1980ESASP.157..311G
- Keywords:
-
- Astronomy;
- Carbon;
- Iue;
- O Stars;
- Ultraviolet Astronomy;
- Abundance;
- Emission Spectra;
- Line Spectra;
- Radiative Transfer;
- Stellar Atmospheres;
- Thermodynamic Equilibrium