Marginally low mass ratio close binary system V1191 Cyg

Abstract

In this study, we present photometric and spectroscopic variations of the extremely small mass ratio ($q\simeq 0.1$) late-type contact binary system \astrobj{V1191 Cyg}. The parameters for the hot and cooler companions have been determined as $M_{\text{h}}$ = 0.13 (1) $M_{\odot }$, $M_{\text{c}}$ = 1.29 (8) $M_{\odot }$, $R_{\text{h}}$ = 0.52 (15) $R_{\odot }$, $R_{\text{c}}$ = 1.31 (18) $R_{\odot }$, $L_{\text{h}}$ = 0.46 (25) $L_{\odot }$, $L_{\text{c}}$ = 2.71 (80) $L_{\odot }$, the separation of the components is $a$= 2.20(8) $R_{\odot }$ and the distance of the system is estimated as 278(31) pc. Analyses of the times of minima indicates a period increase of $\frac{dP}{dt}=1.3(1)\times 10^{-6}$ days/yr that reveals a very high mass transfer rate of $\frac{dM}{dt}=2.0(4)\times 10^{-7}$$M_{\odot }$/yr from the less massive component to the more massive one. New observations show that the depths of the minima of the light curve have been interchanged.

Accepted for publication in New Astronomy, 16 pages, 2 figures, 4 tables

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Cited by in corpus (7)

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• Physical Parameters of Some Close Binaries: ET Boo, V1123 Tau, V1191 Cyg, V1073 Cyg and V357 Peg
• An optical and X-ray study of the contact binary, BH Cassiopeiae
• Light curve analysis and orbital period change of the extreme mass-ratio overcontact binary AW CrB
• Close Binary System GO Cyg
• The multiple nature of CC Com: one of the ultra-short orbital period late-type contact binary systems