UBVRI Photometric Study of the Totally Eclipsing Very Short Period W Ursae Majoris Binary GSC 2765-0348

UBVRI Photometric Study of the Totally Eclipsing Very Short Period W Ursae Majoris Binary GSC 2765-0348

ABSTRACT GSC 2765-0348 is a very short period ( P = 0.2835 d), solar type, G4V contact binary. Complete BVRI and partial U light curves covering the secondary eclipse are presented, along with a period study, surface temperature determination, and a simultaneous UBVRI light-curve solution. Our light...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 2012-10, Vol.124 (920), p.1025-1034
Hauptverfasser: Samec, Ronald G., Flaaten, Daniel, Jaso, Adam, Oliver, Bruce, Rehn, Travis, Faulkner, Danny R., Van Hamme, W.
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container_end_page 1034
container_issue 920
container_start_page 1025
container_title Publications of the Astronomical Society of the Pacific
container_volume 124
creator Samec, Ronald G.
Flaaten, Daniel
Jaso, Adam
Oliver, Bruce
Rehn, Travis
Faulkner, Danny R.
Van Hamme, W.
description ABSTRACT GSC 2765-0348 is a very short period ( P = 0.2835 d), solar type, G4V contact binary. Complete BVRI and partial U light curves covering the secondary eclipse are presented, along with a period study, surface temperature determination, and a simultaneous UBVRI light-curve solution. Our light curves show low-level ripples, surface activity, and asymmetries due to magnetic activity. Light curve amplitudes vary from 0.4-0.6 mag ( V) in the primary and secondary eclipses. The difference in adjacent maxima varies from ∼3-5%. Modeled results include two spot regions, one hot and one cool, both at equatorial positions of the primary, more massive component. A firm 34% fill-out and a small mass ratio of 0.31 is also determined. A total eclipse of 33 minutes is found to occur in the secondary eclipse, making GSC 2765-0348 a W-type (less massive star is hotter), W UMa variable.
doi_str_mv 10.1086/668126
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subjects Astronomy
Earth, ocean, space
Exact sciences and technology
title UBVRI Photometric Study of the Totally Eclipsing Very Short Period W Ursae Majoris Binary GSC 2765-0348
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