Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.2270g&link_type=abstract
Astronomical Journal v.113, p.2270
Astronomy and Astrophysics
Astronomy
3
Binaries: Close
Scientific paper
A complete analysis of U, B, V photometric light curves of HL Aurigae is presented. Twelve new precision epochs of minimum light were determined. A period study spanning 45 years and utilizing more than 135 times of minimum light indicates that the period has remained essentially constant. The photometry has been standardized and our analysis includes corrections for interstellar reddening. We find that HL Aurigae is in a semidetached configuration with the primary component having a fillout of 95%. The primary and secondary components have spectral types of Fl V and G9 V, respectively, and a mass ratio of ˜0.8. The photometric solution gives a surprisingly large third light amounting to 18% in V, and 14% in U and B. Our calculations suggest the presence of an unresolved G2 V component separated by less than 340 AU from the close pair. Thus, we tentatively conclude that HL Aur is in an hierarchical triple star system, i.e., a close pair with a well-separated component.
Carrigan Brian J.
Gray Jamison D.
Samec Ronald G.
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