Sinusoidal cepheids as first-overtone pulsators

Details Sinusoidal cepheids as first-overtone pulsators Sinusoidal cepheids as first-overtone pulsators

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pasp...92..165c&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 92, Apr.-May 1980, p. 165-175. Research supported by the MacLean Observa

Astronomy and Astrophysics

Astronomy

16

Cepheid Variables, Magellanic Clouds, Stellar Spectra, Stellar Spectrophotometry, Electrophotometry, Light Curve, Stellar Luminosity

Scientific paper

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.

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