Carbon and nitrogen abundances in the carbon-rich Cepheid V553 Centauri.

Details Carbon and nitrogen abundances in the carbon-rich Cepheid V553 Centauri. Carbon and nitrogen abundances in the carbon-rich Cepheid V553 Centauri.

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.189...13c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 189, p. 13 - 25

Astronomy and Astrophysics

Astronomy

10

Carbon:Cepheids, Cepheids:Light Curves, Cepheids:Nitrogen, Cepheids:Photometry, Cepheids:Spectra

Scientific paper

A spectroscopic and photometric analysis of the carbon-rich Cepheid V553 Centauri has been undertaken, and the following results were obtained: [Fe/H] = 0.1, [C/Fe] = +0.8 and [N/Fe] = +0.5; all values relative to the Sun. This research also considered the nuclear processes and evolutionary status of a variable star having the above abundances. The near-solar composition means that V553 Cen must have an extremely small envelope to be evolving in the instability strip with its derived luminosity, log L/Lsun of ˜2. A possible interpretation of V553 Cen is as the progeny of the strong-lined RR Lyrae stars, where this object has evolved to a position above the horizontal branch and is currently either a supra-horizontal branch star of a loop Cepheid.

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