21 Vul a new luminous long period delta Scuti star.
Abstract
Photometric observations of 21 Vul have revealed it to be a Delta Scuti variable star with one of the longest known periods, 0.227 d, among those variables. 21 Vul presented a short period amplitude variability of about 0.05 mag, and the log of its effective temperature was calculated to be 3.891. Moreover, its luminosity (absolute visual magnitude is higher than Mv = 0) suggests a luminosity class brighter than IV, and places it in the instability strip very close to the faintest Cepheids.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1979
- Bibcode:
- 1979A&A....79..347G
- Keywords:
-
- Metallic Stars;
- Stellar Spectra;
- Stellar Spectrophotometry;
- Variable Stars;
- Cepheid Variables;
- Hertzsprung-Russell Diagram;
- Light Curve;
- Stellar Luminosity;
- Astrophysics;
- Delta Scuti Stars:Photometry