Computer Science
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982msngr..29....1p&link_type=abstract
The Messenger, No.29, P. 1, 1982
Computer Science
Scientific paper
Ever since 1912, when Miss Leavitt discovered the famous period-Iuminosity law for Cepheids in the Magellanic Clouds, the Clouds have played a central role in the study of these important and fascinating pulsating stars. The reason for this is simple: the Magellanic Clouds are relatively small in comparison to their distances from uso When looking at one of the Clouds, we observe therefore stars which are all at approximately the same distance. A second advantage is that the extinction by interstellar dust in the Clouds is much less of a problem than in our own Galaxy, where it is a major obstacle for determinations of absolute magnitudes, distances, and intrinsic colours. Fortunately Cepheids occur frequently, both in the Large Cloud (LMC) and in the Small Cloud (SMC), and since they are supergiants they are still reasonably bright, even at a distance of 50 or 60 kiloparsecs. For an analysis of the relative differences between Cepheids of various periods the Clouds are therefore uniquely suited.
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