High-resolution profiles of sodium and potassium lines in Alpha Orionis.
Abstract
Profiles of the K I resonance line at 7698.98 A and of the D1 and D2 lines of Nai in the spectrum of a Ori have been recorded photoelectrically using the main beam of the McMath solar telescope at KPNO. The Na lines were observed in the fourth order of the spectrograph and the K iline in the third order, providing a resolving power of approximately 50 mA. The observed profiles are consistent with a model in which radiation from the stellar photo sphere is scattered and reemitted by an expanding envelope or envelopes of radius large compared with that of the photosphere. Each blueshifted absorption core appears to consist of two components of approximately the same intensity. The first has a heliocentric radial velocity of + 11-13 km , which agrees very well with measurements of other resonance lines by other observers, whereas the second is in the range + 6 km 1 and appears not to have been detected previously. Subject headings: circumstellar shells - late-type stars - stellar winds - stars, individual
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 1975
- DOI:
- 10.1086/153706
- Bibcode:
- 1975ApJ...199..427G
- Keywords:
-
- D Lines;
- K Lines;
- M Stars;
- Stellar Envelopes;
- Stellar Winds;
- Supergiant Stars;
- Absorption Spectra;
- Astronomical Models;
- Late Stars;
- Line Spectra;
- Potassium;
- Stellar Spectra;
- Astronomy