EXOSAT observations of active stellar coronae in the Cygnus Loop, T Tau and NGC 2264 regions

Details EXOSAT observations of active stellar coronae in the Cygnus Loop, T Tau and NGC 2264 regions EXOSAT observations of active stellar coronae in the Cygnus Loop, T Tau and NGC 2264 regions

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40...73c&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

Cool Stars, Star Clusters, Stellar Activity, Stellar Coronas, Stellar Spectrophotometry, Supernova Remnants, Exosat Satellite, Light Curve, Spaceborne Astronomy, Stellar Flares, Subgiant Stars, Ultraviolet Spectra, Variable Stars, Visible Spectrum, X Ray Sources

Scientific paper

A highly variable point X-ray source, first seen by the Einstein IPC, has been positioned with the Exosat CMA and identified with a bright (V = 8.5) K0 star. Although in the direction of the southern half of the Cygnus Loop, this star is almost certainly a foreground object and typical of other active cool stars that are related to RS CVn systems. An Exosat program to study T Tauri stars failed to detect T Tau itself. However, a strong X-ray source was observed 15 arcmin from T Tau, which in its turn had not been seen by Einstein. This new source has been identified with a hitherto unstudied 13 mag star which is likely to be a dMe flare star. The young star cluster NGC 2264 was observed with the Exosat CMA in an attempt to identify the sources found during an Einstein IPC study of S Mon. Apart from S Mon itself, only UV-bright objects were seen, but several of these are considered likely counterparts of the Einstein sources.

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