V902 Sagittarii, A Magnetically Active, Small Mass Ratio, High Fill-out Binary

Details V902 Sagittarii, A Magnetically Active, Small Mass Ratio, High Fill-out Binary V902 Sagittarii, A Magnetically Active, Small Mass Ratio, High Fill-out Binary

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.4711s&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #47.11; Bulletin of the American Astronomical Society, Vol. 33, p.1176

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of BVRc light curves of the very short period eclipsing binary V902 Sagittarii. Our present observations were taken at Cerro Tololo InterAmerican Observatory in Chile, with the 1.0-m Yale Reflector and a Ga-As PMT and standard filters on July 22-23, 1993, by RGS. Nearly 300 observations were taken in each pass band. The precision was of the observations was about 0.01 mag. The curves are of W UMa type (EW) with spot activity. A 48 minute time of constant light was recorded in the secondary eclipse, so the curves are of W-type. Four mean epochs of minimum light were determined: 2449190.6293(II), 244910.7797(I), 2449191.6589(I), 24191.80805 (II). An improved linear ephemeris was calculated, J.D. Hel Min I = 2449191.6600(01)d + 0.293944386 (17) X E, which is a 7 hour 3 minute orbital period. The simultaneous BVR synthetic light curve analysis gives a tiny mass ratio of 0.12, an extremely large fill-out of 0.58, and a very small difference in component temperatures of 75K. The average surface temperature of the smaller component is slightly hotter. However, this temperature result is probably spurious. Heavy dark spots undoubtedly cover much of the more massive component, masking its true temperature. This research was partially supported by a grant from NASA administered by the American Astronomical Society.

Affiliated with

Also associated with

No associations

Rating

V902 Sagittarii, A Magnetically Active, Small Mass Ratio, High Fill-out Binary does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with V902 Sagittarii, A Magnetically Active, Small Mass Ratio, High Fill-out Binary, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and V902 Sagittarii, A Magnetically Active, Small Mass Ratio, High Fill-out Binary will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1233184