Other
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..328s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, Aug. 1986, p. 328-334.
Other
14
Abundance, Cepheid Variables, Dwarf Galaxies, Elliptical Galaxies, Stellar Spectrophotometry, Binary Stars, Magellanic Clouds, Mass Distribution, Metallicity, Stellar Evolution, Stellar Magnitude
Scientific paper
The Sculptor dwarf galaxy contains at least three Cepheids (V25, V26, and V119), each with a period near 1 day and B magnitudes about 1.4 mag brighter than those of the Sculptor RR Lyrae stars. Low-resolution spectra of these so-called 'anomalous' Cepheids were obtained. Metal abundances of the Cepheids have been determined by the Delta-S method and are found to be: Fe/H = -1.9 + or - 0.2, -1.8 + or - 0.2, and -2.2 + or - 0.3 for V25, V26, and V119, respectively. These values are consistent with the metal abundances of Sculptor red giants estimated from the color of the giant branch. Pulsational masses have been estimated for V25 and V26, but there is a need for improved photometry of these stars to obtain accurate results. It cannot be unambiguously established whether the Sculptor anomalous Cepheids are evolved single stars, aged about 3 Gyr, or whether they are created by mass transfer in older binary systems. The occurrence of anomalous Cepheids in other systems is discussed. There is some evidence that most anomalous Cepheids in the Small Magellanic Cloud are evolved single stars.
Smith Harold A.
Stryker L. L.
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