Statistics – Computation
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..467g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 467-475. Research supported by the Universidad Nacion
Statistics
Computation
73
Cepheid Variables, Stellar Color, Stellar Luminosity, Binary Stars, Computational Astrophysics, Periodic Variations
Scientific paper
Surface brightnesses have been obtained for 52 southern Cepheids and 63 northern Cepheids using the (V-R) color index. A period-radius relation (in the period range of 3-45 days) of log R = 1.108 + or - 0.743 log P is obtained, with uncertainties of + or - 0.023 in the zero point and slope. The influence of unresolved binaries and possible overtone pulsators on this relation is considered. The present period-radius relation is shown to be consistent with current determinations of distances and effective temperature scales for classical Cepheids. No evidence is found to support the contention that all shorter period Cepheids are overtone pulsators.
Barnes Thomas G. III
Gieren Wolfgang P.
Moffett Thomas Joseph
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