EXOSAT observations of active stellar coronae in the Cygnus Loop,T Tau & NGC 2264 regions |
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Authors: | P. A. Charles R. H. D. Corbet K. Mukai A. P. Smale S. M. Kahn L. V. Kuhi A. Brown |
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Affiliation: | (1) Department of Astrophysics, Oxford University, South Parks Road, OX1 3RQ Oxford, UK;(2) Department of Physics & Astronomy, UC, Berkeley;(3) JILA, University of Colorado, Boulder |
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Abstract: | 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 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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