Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as..100...25h&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 100, no. 1, p. 25-32.
Astronomy and Astrophysics
Astrophysics
4
Open Clusters, Stellar Spectrophotometry, Ubv Spectra, Cassiopeia Constellation, Color-Color Diagram, Color-Magnitude Diagram, Interstellar Extinction
Scientific paper
New photoelectric UBV observations of 16 stars in NGC 654 have been used to restandardize published photoelectric data. The compilation of the best data is used in conjunction with proper motions for a detailed analysis of the cluster. The distance-modulus for NGC 654 is (V - M(V))O = 12.00 (d = 2500 pc) and the reddening varies from E(B - V) = 0.74 to 1.19. The age, based on new models including the latest opacity tables, is 14.1 x 10 exp 6 yr (log t = 7.15). The F5 Ia supergiant (HD 10494) falls close to the blue end of the blue loop, which is a strong argument in favor of its membership. The present analysis confirms the tendency already observed to find the less reddened stars close to the cluster center.
del Rio G.
Huestamendia G.
Mermilliod Jean-Claude
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