Sinusoidal cepheids as first-overtone pulsators.
Abstract
New photometry is presented for a group of sinusoidal cepheids in the Large Magellanic Cloud. Although they appear to mix well with normal cepheids in the instability strip they form a unique, parallel, period-luminosity relation to that of normal cepheids. Excellent agreement is found with theoretical fundamental and first-overtone blue edges indicating that the sinusoidal cepheids are pulsating in their first-overtone. This agreement with the blue edges is only valid for an LMC distance modulus of 18.56. The sinusoidal cepheids in the LMC have the same luminosity as the Galactic double-mode cepheids. The reason for this is not understood.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- April 1980
- DOI:
- 10.1086/130641
- Bibcode:
- 1980PASP...92..165C
- Keywords:
-
- Cepheid Variables;
- Magellanic Clouds;
- Stellar Spectra;
- Stellar Spectrophotometry;
- Electrophotometry;
- Light Curve;
- Stellar Luminosity;
- Astrophysics