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S 10947 Aquilae RX J2009.8+1557: a probable RS CVn star which sometimes stops its eclipses *
Received 9 May 2000 / Accepted 14 August 2000
We report the discovery of a new variable star, called S 10947 Aql, as the likely optical counterpart of RX J2009.8+1557. The optical variability pattern as well as the detected X-ray emission suggest that it is a chromospherically active binary of the RS Canum Venaticorum ( RS CVn) type. We discovered an occasional disappearance of the eclipsing minima as well as large variations in the eclipse amplitude. We discuss possible causes of this peculiarity.
Key words: stars: binaries: close stars: circumstellar matter stars: individual: S 10947 Aql X-rays: stars
* The complete Table 1 is available in electronic form at the CDS via anonymous ftp to ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/361/1005 (18.104.22.168) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/361/1005
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Online publication: October 10, 2000