Spectral behaviour of the eclipsing binary TX UMa around primary minimum |
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| Authors: | Ladislav Hric Richard Kom?ík Ji?í Grygar |
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| Institution: | (1) Astronomical Institute of the Slovak Academy of Sciences, Tatranská Lomnica, Czechoslovakia;(2) Department of Astronomy and Astrophysics, Comenius University, Bratislava, Czechoslovakia;(3) Institute of Physics, Czechoslovak Academy of Sciences,  e , Czechoslovakia |
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| Abstract: | Sixty-one blue spectrograms of TX UMa were obtained in the years 1969–1970, mainly in phases close to the primary minimum of the eclipsing system. The radial velocity curve displays clear rotational effect from which much higher than synchronous rotational velocity of the blue (B8V) component has been formally derived. However, this discrepancy is probably due to the presence of the tenous accretion disk around the primary. The disk is apparently fed by the intermittent mass transfer as indicated by the occasional changes of orbital period of the system. From all available radial velocity data an improved set of spectroscopic orbital elements is derived. The behaviour of the spectral lines in and out of the primary minimum is compared. Metallic lines of the cold (F7IV) secondary component are clearly seen exclusively in phases 0.988 to 0.012.Paper presented at the 11th European Regional Astronomical Meetings of the IAU on  New Windows to the Universe , held 3–8 July, 1989, Tenerife, Canary Islands, Spain. |
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