Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...270..297h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 297-303.
Astronomy and Astrophysics
Astrophysics
10
Blue Stars, Eclipsing Binary Stars, Globular Clusters, Light Curve, Stellar Evolution, Stellar Spectrophotometry
Scientific paper
The light curve of the eclipsing blue straggler NJL5, which is a radial velocity member of Omega Cen, is typical of an Algol type binary. It has been analyzed with the Wilson-Devinney light curve synthesis program. Awaiting determination of radial velocity curves, tight constraints on the masses have been deduced from the photometric solution in combination with stellar evolution considerations, leading to M(1) = 1.2 +/- 0.1 solar mass and M(2) = 0.16 +/- 0.02 solar mass. It is shown that the present properties of NJL5 are fully compatible with the assumption that the binary was formed at the same time as the other cluster members with initial masses M(1) approximately equal to 0.6-0.8 solar mass and M(2) approximately equal to 0.8 solar mass, and that it evolved in a generally well understood manner, with mass transfer beginning a few Gyr ago while star 2 was near the turnoff point. The implications for the interpretation of globular cluster blue stragglers as results of binary evolution are briefly discussed. We point out that a combined radial velocity and light curve analysis can provide a determination of the distance to the binary and thus the cluster.
Helt Bodil E.
Jorgensen Henning E.
King Simon
Larsen Age
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