Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.185..189g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 185, no. 2, Nov. 1991, p. 189-193.
Astronomy and Astrophysics
Astrophysics
6
Eclipsing Binary Stars, Line Spectra, Roche Limit, Stellar Spectra, H Gamma Line, Spectrograms, Spectrographs
Scientific paper
Eclipsing binary TX UMa was observed with the DAO high-dispersion spectrographs in 1969-1970, with emphasis on the detailed coverage of the primary minimum. One spectrum was taken exclusively within totality, thus exhibiting an uncontaminated spectrum of the secondary component. This leads to spectral reclassification of the secondary (F6 IV). The narrowing of the line profile of the H-gamma-line in totality is interpreted in terms of synchronous rotation of the secondary (v sin i about 80 km/s) while the primary rotates faster (v sin i about 130 km/s) than synchronously (v sin i about 50 km/s). Although the secondary does not fill in its Roche lobe fully, the system exhibits pronounced indications of rather strong physical interaction. This is now supported also by the profound changes of the line profiles of the H gamma-line with phase.
Grygar Jiri
Hric Ladislav
Komzik Richard
Šíma Zdislav
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