Physics – Fluid Dynamics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104...29s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, Jan. 1992, p. 29-37. Research supported by Margare
Physics
Fluid Dynamics
4
Charge Coupled Devices, Light Curve, Stellar Magnitude, Variable Stars, Visual Photometry, Cygnus Constellation, Ephemerides, Stellar Mass Accretion
Scientific paper
CCD images of the thirteenth-magnitude variable V865 Cygni were taken on four consecutive nights in the summer of 1990. The 1.1-m Hall reflector telescope was used in conjunction with an RCA CCD camera system. Four times of minimum light were determined and improved linear and quadratic ephemerides were calculated. A period study, spanning over a forty-year interval, seems to indicate that the system is undergoing a continuous period increase of 5.4 x 10 exp -8 day/yr. In a conservative scenario, this would be an indication of a mass accretion by the primary, more massive, component. The V, R, and I light curves formed by the first precision photometry to be obtained on V865 Cygni show that it is an A-type W UMa system. The curves are somewhat incomplete since the maximum that follows the secondary eclipse was not covered. The first synthetic light-curve solution of V865 Cygni is also presented. This solution reveals that V865 Cygni is a contact binary consisting of two G-spectral-type components with a fillout of about 18 percent and a mass ratio of about 0.45. The component temperature difference is only 110 K. A substantial hot spot region of about 34-deg diameter is proposed to model the asymmetry in the light curves following the observed maximum. The origins of this region can be attributed to fluid dynamics rather than to the usual magnetic activity which is prevalent in late-type systems like V865 Cyg.
Herr Scott A.
Kreidl Tobias J.
Samec Ronald G.
Zetzl James T.
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