Narrow-band photometry of BET LYR in 1971.
Abstract
Observations of Beta Lyrae (with HR 6997 as the principal companion star) are presented, principally of certain strong lines and neighboring continuum regions obtained through interference filters of bandwidths ranging from 27.0 to 33.7 A. Light curves in the 3 blue and 3 red bands are shown, and color indices and emission intensity indices are tabulated. Moreover, a photometric index of emission line strength, analogous to the spectroscopic index of Batten and Sahade (1973), is derived. It is suggested that the H alpha emission comes from a larger region around the binary star than does the helium emission and is asymmetrical, being weakest near quadrature when the primary star is approaching earth. The helium emission, by contrast, is more symmetrical, and varies with binary phase by a larger fractional amount.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- January 1980
- Bibcode:
- 1980A&AS...39...23S
- Keywords:
-
- Eclipsing Binary Stars;
- Lyra Constellation;
- Stellar Spectrophotometry;
- Emission Spectra;
- Light Curve;
- Line Spectra;
- Tables (Data);
- Astronomy