Metallic Line Profiles of the A0 V Star VEGA
Abstract
High dispersion ultrahigh signal to noise Reticon spectra of Vega were obtained with the coude spectrograph of the 1.2 m telescope. A mean signal to noise ratio of 2500 over the spectral region lambdas from 3825 to 5435 was achieved. Examination of the line profiles confirmed the presence of two different types of profiles which were previously seen in IIIaJ and lower signal to noise Reticon spectra. The profiles of the strong lines are essentially classical rotational profiles with enhanced wings which are slightly stronger than expected while those of weak lines are clearly flat-bottomed resulting in a trapezoidal appearance. A few possible theoretical explanations are presented.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 1991
- DOI:
- 10.1086/170577
- Bibcode:
- 1991ApJ...380..223G
- Keywords:
-
- Signal To Noise Ratios;
- Spectral Bands;
- Stellar Atmospheres;
- Stellar Spectra;
- Stellar Spectrophotometry;
- Early Stars;
- Metals;
- Spectrographs;
- Telescopes;
- Astrophysics;
- LINE PROFILES;
- STARS: INDIVIDUAL CONSTELLATION NAME: ALPHA LYRAE;
- STARS: ROTATION