High resolution observations of magnesium II 2800 angstrom in alf CenA : the density of interstellar magnesium II and the stellar chromospheric profiles.
Abstract
The profiles are virtually identical with the solar profiles except for the presence of an absorption feature near line center in the h and k lines of Alpha Centauri A. It is found that this absorption feature can be explained by interstellar absorption of Mg II along the line of sight. The average density of Mg II is found to be 2.75 plus or minus 0.7 x 10 to the -7th/cu cm, in good agreement with the previously determined values in the solar vicinity in the direction of Alpha CMa and Alpha Lyr.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1982
- DOI:
- 10.1086/159557
- Bibcode:
- 1982ApJ...252..302O
- Keywords:
-
- Abundance;
- Chromosphere;
- H Lines;
- Interstellar Matter;
- K Lines;
- Magnesium;
- Ultraviolet Spectra;
- Absorption Spectra;
- High Resolution;
- Interstellar Extinction;
- Iue;
- Line Spectra;
- Astrophysics