Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1312g&link_type=abstract
The Astronomical Journal, vol. 108, no. 4, p. 1312-1324
Astronomy and Astrophysics
Astronomy
12
Astronomical Photometry, Cepheid Variables, Globular Clusters, Stellar Evolution, Stellar Luminosity, Stellar Mass, Ultraviolet Astronomy, Ultraviolet Photometry, Ultraviolet Radiation, Asymptotic Giant Branch Stars, Brightness, Charge Coupled Devices, Least Squares Method, Light Curve, Stellar Gravitation, Stellar Temperature, Ultraviolet Telescopes
Scientific paper
Photometric observations of ultraviolet (UV)-bright stars have been acquired and analyzed in the framework of recent theories concerning post-horizontal branch stellar evolution. Photometric charge coupled devices (CCD) B and V observations of V1, V29, V43, V48, and V92 in omega Cen are used to calculate their masses, temperatures, and surface gravities. The resultant masses range from 0.51 to 0.67 solar mass and are consistent with theoretical expectations. The new observations are also combined with historical data to derive more accurate (and precise) period derivatives. The most luminous cepheids are found to experience large and sudden period changes, while the fainter ones exhibity constant period derivatives. The photometric properties of the nonvariables, ROA 24 and ROA 342, are also discussed.
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