Classification of intrinsic variables. IX - The Cepheid domain

Details Classification of intrinsic variables. IX - The Cepheid domain Classification of intrinsic variables. IX - The Cepheid domain

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..361e&link_type=abstract

Astronomical Journal, vol. 88, Mar. 1983, p. 361-378.

Astronomy and Astrophysics

Astronomy

21

Astronomical Catalogs, Cepheid Variables, Giant Stars, Light Curve, Red Shift, Star Clusters, Stellar Color, Stellar Evolution, Stellar Luminosity, Supergiant Stars

Scientific paper

Intermediate band, Hβ and RI observations have been obtained throughout the cycle of variation for 135 high mass, long-period and short-period cepheids (LPC and SPC). This material, together with the observations previously discussed for some 100 ultrashort periods cepheids (USPC), is used to delineate the cepheid domain in the (β,[C1]) and (MBol,log Te) planes. The independently derived luminosity calibrations for bright giants and supergiants previously published are found to closely reproduce the luminosities derived from the Sandage-Tammann PL relation for most variables. The theoretical "fundamental blue edge," computed by Iben and Tuggle with Y = 0.38, closely represents the blue edge of the cepheid domain.

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