Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1260e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, July 1985, p. 1260-1277.
Astronomy and Astrophysics
Astronomy
28
Astronomical Photometry, Cepheid Variables, Supergiant Stars, Metallicity, Star Distribution, Stellar Luminosity, Stellar Temperature
Scientific paper
Photometric parameters found for Cepheids in a previous paper are adapted for use with nonvariable supergiants of similar temperature. The close correlation between the abundance ([M1]) and luminosity ([C1]) parameters for classical, short-period Cepheids (SPC, P ≤ 10 days) confirms the nearly dispersionless luminosity temperature relation for these variables. The assumptions that (1) the C-type variables are transiting the Cepheid temperature for the first time, (2) the classical SPC are mostly transiting for the second time, and (3) the long-period Cepheids (LPC, P > 10 days) are a mixture of stars transiting for the first to third or fourth times are found to be consistent with the various correlations of temperature and luminosity parameters. The nonvariable supergiants with photometric parameters similar to those for the Cepheids are found to have luminosities consistent with their spectroscopic luminosity class. Several possible associations of Cepheids and nonvariable supergiants with early-type stars are suggested.
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