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Title:
Physical parameters of stars in the Scorpio-Centaurus OB association
Authors:
de Geus, E. J.; de Zeeuw, P. T.; Lub, J.
Affiliation:
AA(Leiden, Rijksuniversiteit, Sterrewacht, Netherlands; Maryland, University, College Park), AB(Institute for Advanced Study, Princeton, NJ), AC(Leiden, Rijksuniversiteit, Sterrewacht, Netherlands; Observatorio del Roque de los Muchachos, Santa Cruz de La Palma, Spain)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 44-61. (A&A Homepage)
Publication Date:
06/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL PHOTOMETRY, B STARS, O STARS, SKY SURVEYS (ASTRONOMY), STAR CLUSTERS, HERTZSPRUNG-RUSSELL DIAGRAM, INTERSTELLAR EXTINCTION, MOLECULAR CLOUDS, STELLAR COLOR, STELLAR GRAVITATION, STELLAR MAGNITUDE
Bibliographic Code:
1989A&A...216...44D

Abstract

Walraven photometry is presented of established and probable members of the Scorpio-Centaurus OB association. For each star, effective temperature and surface gravity are derived using Kurucz (1979) atmosphere models. From the Straizys and Kuriliene (1981) tables, absolute magnitudes are calculated. Distance moduli and visual extinctions are determined for all stars. From a comparison of the HR-diagrams of the stars in each subgroup with theoretical isochrones, the ages of the three subgroups are derived. The distances to the three subgroups are shown to be different; there is a general trend (also within each subgroup) for the distances to be larger at higher galactic longitudes. The visual extinction in the youngest subgroup Upper-Scorpius, is well correlated with the IRAS 100-micron map. The distance toward the Ophiuchus dark clouds is found to be 125 pc, based on the photometric distances to the stars. Most of the early-type stars in Upper-Scorpius are located at the far side of the dark clouds.

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