Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985crasb.300..569p&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre
Astronomy and Astrophysics
Astronomy
Cosmology, Distance, Globular Clusters, Magellanic Clouds, Astronomical Photometry, Brightness, Magnitude
Scientific paper
The results of a systematic search for a measurable parameter which is correlated to the integrated luminosity of a globular cluster of an external galaxy are presented. The data are obtained using UBV photometry integrated through several circular diaphragms centered on the clusters of the Magellanic Clouds. The variation of the surface brightness and the apparent magnitude are calculated for 15 clusters of the Large Magellanic Cloud and 4 clusters of the Small Magellanic Cloud, as a function of the diameter of the aperture used. Three parameters, the isophotal diameter, the apparent total magnitude, and the effective diameter, are deduced. For each cluster, the absolute magnitude of the total extinction produced by the interstellar material is corrected. New relationships are found between the observable parameters and the absolute magnitude for the clusters, and it is shown that such relationships can be used to determine extragalactic distances.
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