In this paper we report the discovery of the chromospherically active ( RS CVn type ) binary TYC 8380-1953-1Â through the XMM-Newton slew survey and present results of our optical and X-ray follow-up .
With a flux limit of 6 \times 10 ^ { -13 } erg cm ^ { -2 } s ^ { -1 } in the soft band ( 0.2 - 2 keV ) , the XMM-Newton slew has a similar sensitivity to the ROSAT All Sky Survey allowing interesting sources to be identified by their long-term variability .
Two different types of stellar sources are detected in shallow X-ray surveys : young stars ( both pre-main and main sequence stars ) and chromospherically active binaries ( BY Dra and RS CVn type systems ) .
The discovery of stars in such surveys and the study of their nature through optical follow-ups is valuable to determine their spatial distribution and scale height in the Galaxy .
Our analysis shows that TYC 8380-1953-1Â is a double-lined spectroscopic binary with both components having similar spectral type ( likely K0/2+K3/5 ) and luminosity .
With a typical coronal temperature for an RSÂ CVn system ( kT \sim 1.15 keV ) and an X-ray luminosity in the 0.3–10 keV energy band higher than 4 \times 10 ^ { 31 } erg s ^ { -1 } , TYC 8380-1953-1Â lies among the most X-ray luminous RSÂ CVn binaries .