Photometric Studies of a Detached, but Near Contact System, VV Vir and an Extreme Mass Ratio W UMa Binary, GSC 2537 0520

Details Photometric Studies of a Detached, but Near Contact System, VV Vir and an Extreme Mass Ratio W UMa Binary, GSC 2537 0520 Photometric Studies of a Detached, but Near Contact System, VV Vir and an Extreme Mass Ratio W UMa Binary, GSC 2537 0520

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.0325f&link_type=abstract

American Astronomical Society, AAS Meeting #211, #03.25; Bulletin of the American Astronomical Society, Vol. 39, p.727

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present preliminary analyses of two interacting eclipsing binaries from observations taken with the NURO and SARA telescopes in early summer, 2006. Light curves, period studies and light curve solutions are presented. Light curves were premodeled with Binary 3.0 and then solved with the 2004 version Wilson code.
Our CCD observations of VV Vir were taken 15-17 May at Lowell Observatory (NURO) and May 28 at Kitt Peak in remote mode (SARA). About 200 observations were taken in each of BVRI. Two mean times of minimum light were determined: HJDMin I=2453872.83558(±0.0004)d, and HJDMin II=2453884.65947(±0.00010)d. The following linear ephemeris was calculated:
HJD Min I =2453872.8343 (±.0.0006)d + 0.44613376 (±0.0000013)*E (1)
VV Vir is a detached, but near contact binary. The system parameters from the Wilson Code include a mass ratio of 0.77, a temperature difference of 1060K and an inclination of 80.9°. A stream spot was modeled on the secondary component (Tfactor = 1.4).
GSC 2537 0520 was discovered by ROTSE1 (IBVS 5541, 2004). Observations were taken on 10 to 12 May at NURO and 4 May at SARA. About 200 observations were taken in each of BVRI and 70 in U. The eclipses are total. Mean times of eclipses were calculated: HJDMinI = 53860.9364(9) and HJDMinII = 53867.8040 (9). Linear and quadratic ephemerides were calculated:
HJD Hel Min I =2453860.9382 (±.0.0008)d + 0.37103849 (±0.00000029)*E (2)
HJD Hel Min I =2453860.9388 (±.0.0005)d + 0.37103773 (±0.00000053)*E -0.00000000016 (±0.00000000008) *E2 (3)
GSC 2537 0520 is an A-type extreme mass ratio, short period W UMa system with a large component temperature difference. Wilson code parameters include a mass ratio of 0.17, a shallow contact fill-out of 11%, a temperature difference of 700K and an inclination of 78°. The binary is magnetically active.

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