The variable shell star HR 5999: III. A new lightcurve based on Walraven and Strömgren photometries.
Abstract
The irregular variable shell star HR 5999 has been observed on the Walraven and Str6mgren photometric systems from July 9 until October 22, 1977. The lightcurve derived from these observations shows two maxima, at Vj = 6W80 and one fainter at Vj = 7W05. The brightness variation of the star is in general smooth, except at the maxima where it shows irregularities. At these maxirnum brightnesses we are looking through the circumstellar shell at places where the column density of the dust grains is small. The colourcurve does not exhibit large variations. It is clear, however, that the star becomes somewhat redder when it is fainter. Key words: variable star - shell star - Ae type star in nebulosity
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- August 1978
- Bibcode:
- 1978A&AS...33..213T
- Keywords:
-
- A Stars;
- Electrophotometry;
- Light Curve;
- Shell Stars;
- Stellar Envelopes;
- Stellar Spectrophotometry;
- Variable Stars;
- Color;
- Graphs (Charts);
- Astronomy;
- Colors:Shell Stars;
- Shell Stars:Stroemgren Photometry;
- Shell Stars:Walraven Photometry