Photometric Classification of Pulsating Variables with Periods Between 1-DAY and 3-DAYS

Details Photometric Classification of Pulsating Variables with Periods Between 1-DAY and 3-DAYS Photometric Classification of Pulsating Variables with Periods Between 1-DAY and 3-DAYS

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981msngr..25...29d&link_type=abstract

The Messenger, No.25, P. 29, 1981

Physics

Scientific paper

The MESSENGER contains many articles relerring to exciting celestial objects 01 more or less "exotic" nature. In this note the description 01 the photometric behaviour of only a small group 01 stars is presented, which nevertheless have proven to be important in the quest for measuring distances, and which may hold keys lor the theory 01 stellar evolution. These stars show periodic variations of their apparent brightness due to a radial pulsation instability 01 their outer atmospheres. Commonly they have been divided into two major subgroups, the RR Lyrae stars whose periods lie between a few hours and roughly one day, and the Cepheid variables with periods of more than one day. While the first - also called cluster-type variables - are considered to be members 01 the oldest stellar population 01 our Galaxy, the latter are thought to belong primarily to the younger stellar population.

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