A photometric classification of pulsating variables with periods between one and three days

Details A photometric classification of pulsating variables with periods between one and three days A photometric classification of pulsating variables with periods between one and three days

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124..108d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 1, July 1983, p. 108-115.

Astronomy and Astrophysics

Astrophysics

34

Cepheid Variables, Stellar Spectrophotometry, Variable Stars, Dwarf Galaxies, Globular Clusters, Light Curve, Magellanic Clouds, Milky Way Galaxy, Star Distribution, Ubv Spectra

Scientific paper

Available photometric (2000 UBV measurements) data were employed to establish standard classifications of Cepheid variables. The data covered pulsating variables in the Galaxy with periods between 1-3 days. The V lightcurves revealed that the 28 variables in the surveys could be classified into four groups. The RR Lyrae stars have a smooth V lightcurve, a short rise time, and a large amplitude in B(AB). The W Virginis stars exhibit a pronounced brightness hump on the ascending branch 0.2 h before brightness maximum, while BL Herculis stars have a hump on the descending branch, with rise times decreasing with increasing periods. Finally, classical Cepheids have a smooth variation with a gradual rise to maximum. All lie within 3 deg of the galactic equator. The UBV measurements are concluded to be suitable for a coarse separation of populations of stars.

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