Late-Type Near-Contact Eclipsing Binary [HH97] FS Aur-79

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dc.creatorAustin, S. J.
dc.creatorRobertson, J. W.
dc.creatorTycner, C.
dc.creatorCampbell, T.
dc.creatorHoneycutt, R. K.
dc.date2007-02-06
dc.date.accessioned2026-07-07T11:21:06Z
dc.date.available2026-07-07T11:21:06Z
dc.descriptionThe secondary photometric standard star #79 for the FS Aur field (Henden & Honeycutt 1997) designated as [HH97] FS Aur-79 (GSC 1874 399) is a short period (0.2508 days) eclipsing binary whose light curve is a combination of the $β$ Lyr and BY Dra type variables. High signal-to-noise multi-color photometry were obtained using the USNO 1-m telescope. These light curves show asymmetry at quadrature phases (O'Connell effect), which can be modeled with the presence of star spots. A low resolution spectrum obtained with the 3.5-m WIYN telescope at orbital phase 0.76 is consistent with a spectral type of dK7e and dM3e. A radial velocity curve for the primary star was constructed using twenty-four high resolution spectra from the 9.2 m HET. Spectra show H-alpha and H-beta in emission confirming chromospheric activity and possibly the presence of circumstellar material. Binary star models that simultaneously fit the U, B, V, R and RV curves are those with a primary star of mass 0.59+-0.02 Msun, temperature 4100+-25 K, mean radius of 0.67 Rsun, just filling its Roche lobe and a secondary star of mass 0.31+-0.09 Msun, temperature 3425+-25 K, mean radius of 0.48 Rsun, just within its Roche lobe. An inclination angle of 83+-2 degrees with a center of mass separation of 1.62 Rsun is also derived. Star spots, expected for a rotation period of less than a day, had to be included in the modeling to fit the O'Connell effect.
dc.identifierhttps://arxiv.org/abs/astro-ph/0702171
dc.identifierhttp://arxiv.org/abs/astro-ph/0702171
dc.identifierAstron.J.133:1934-1946,2007
dc.identifierdoi:10.1086/512614
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194166
dc.subjectAstrophysics
dc.titleLate-Type Near-Contact Eclipsing Binary [HH97] FS Aur-79
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