Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1278e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, July 1985, p. 1278-1296.
Astronomy and Astrophysics
Astronomy
20
Abundance, Cepheid Variables, Stellar Luminosity, Astronomical Photometry, Light Curve, Milky Way Galaxy, Stellar Color
Scientific paper
The median photometric parameters from intermediate and H-beta photometry of 106 Cepheids are used to test the Sandage-Tammann result that dispersions in the PL and PC relations are correlated with the amplitude of the light curves, as measured by the amplitude defect F(B). The correlation of both color and luminosity dispersions from mean PL and PC relations with F(B) are found to be the result of a correlation between abundance and amplitude. The short-period Cepheids (SPC) are distinctly divided between type C and normal Cepheids, with type C variables defined by F(B). The C-type and normal SPC are separated by 0.65 mag at a given period and abundance, or about 300 K at a given luminosity, with the C-type Cepheids being fainter and bluer, respectively. The light curves of nine-day Cepheids with strong humps may be misinterpreted in that the hump has mistakenly been taken for maximum light.
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