The WUMa Variable, EF Bootis and the Discovery of a Pulsating Variable, GSC 3479 230

Details The WUMa Variable, EF Bootis and the Discovery of a Pulsating Variable, GSC 3479 230 The WUMa Variable, EF Bootis and the Discovery of a Pulsating Variable, GSC 3479 230

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19513202s&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #132.02; Bulletin of the American Astronomical Society, Vol. 32, p.879

Astronomy and Astrophysics

Astronomy

Scientific paper

We report a complete analysis of UBV light curves for the Tycho Variable, EF Boo. Our present observations were taken at Lowell Observatory on April 14-16, 1999. Over 1200 observations were taken in each pass band. The precision was better that 1 mmag in all pass bands. The curves are of typical W UMa type (EW) with spot activity. The maximum at phase 0.25 has a 3 in B. The difference in eclipse depths is less than 0.03 mag in all pass bands. Five mean epochs of minimum light were determined from three primary, and two secondary eclipses. They are 2451282.8356(6), 2451283.6776(1), 2451283.8889(11), 2451284.7290(1), and 2451284.9386(6). The following ephemeris improves upon that given by Tycho, J.D. Hel Min I = 2451283.6774 (1) d + 0.42060833 (7) X E. A complete simultaneous light curve solution is presented. During the observing session, the field star, GSC 3479 230 was found to be variable at the 0.02-0.03 (V) mag level with a period of 87 minutes. Some discussion is given about this strange G-type pulsating variable. This research was partially supported by a grant from NASA administered by the American Astronomical Society.

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