High resolution flux profiles of the Mg II h & k lines in evolved F8 to M5 stars.
Abstract
The central results of a survey of the Mg II resonance line emission in a sample of over 50 evolved late type stars, including spectral-luminosity type F8 to M5 and La to IV are presented. Observed and surface fluxes are derived and correlations noted. The major findings include: (1) Mg II k emission core asymmetry transition near K1 III, analogous to that known for Ca II K; (2) a small gravity and temperature dependence of the Mg II chromospheric radiative loss rate.
- Publication:
-
NASA Conference Publication
- Pub Date:
- 1981
- Bibcode:
- 1981NASCP2171..317S
- Keywords:
-
- Late Stars;
- Line Spectra;
- Resonance Lines;
- Stellar Spectra;
- Acoustic Excitation;
- Atmospheric Heating;
- Chromosphere;
- Flux (Rate);
- Stellar Coronas;
- Stellar Gravitation;
- Stellar Temperature;
- Supergiant Stars;
- Ultraviolet Spectra;
- Astrophysics;
- Line Profiles:Stellar Chromospheres;
- Magnesium:Stellar Chromospheres