Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4402v&link_type=abstract
American Astronomical Society Meeting 208, #44.02; Bulletin of the American Astronomical Society, Vol. 38, p.118
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new CCD observations of V965 Cyg and VV CVn obtained at the National Undergraduate Research Observatory (NURO) on 07-12 March 2005 and on 19-25 July 2004, with the Lowell Observatory 31-inch reflector and a LN cooled CCD camera with a metachrome coated TEK 512 x 512 chip. Standard UBVRI filters were used. Preliminary Wilson light curve analyses and updated ephemerides are presented.For V965 Cyg, two mean times of minimum light were determined and an improved ephemeris was computed using all available eclipse timings. A slight, not very significant quadratic trend may be present. Standard magnitudes were determined from two nights of observations. The U-B and B-V color indices of this 14th magnitude system reveal a substantial reddening. We estimate the binary to be of early-A spectral type and the primary component to have a temperature of about 8850 K. A preliminary light curve fit suggests V965 Cyg to be a high fill-out overcontact binary with a mass ratio of about 0.3.VV CVn is a near-contact as indicated by our light curves which show eclipse depths of 0.65 and 0.30 mag in B. The curves are slightly asymmetric with maxima at phase 0.25 about 1% higher than maxima at phase 0.75. Two mean times of minimum light and new ephemerides were determined. The quadratic ephemeris indicates a dP/dt of $2.8\pm0.6 \times 10^{-8}$ which is rather large for being due to magnetic breaking. A shallow-overcontact solution is possible as well.We wish to thank the NURO for their allocation of observing time, as well as NASA and the AAS for support of travel and publicationexpenses.
Branning Jeremy
Faulkner Danny R.
Hawkins Nathan C.
Rook I. B.
Samec Ronald G.
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