Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8717w&link_type=abstract
American Astronomical Society Meeting 210, #87.17; Bulletin of the American Astronomical Society, Vol. 39, p.200
Astronomy and Astrophysics
Astronomy
Scientific paper
Among several classes of active stars and solar flares, a tight relation between X-ray and radio luminosities is found. This relation, which implies an intimate physical connection, has been subject to coordinated radio and X-ray studies for particular active binaries and dMe stars, but never among the one of the most active classes of stars, pre-main sequence stars. Here we present results from a pair of 40 ks coordinated VLA and Chandra/ACIS-I observations with supporting Spizter IRAC/MIPS and MMT/hectospec data of the nearby young cluster around LkHα 101 (NGC 1579) to examine the X-ray radio connection simultaneously for several scores of stars. We detected over 200 X-ray sources, a score of radio sources and 110 IR-excess sources. From the X-ray data alone we conclude that the cluster is about 600pc away. Overall 156 X-ray sources were matched to the IR catalog. Of these, 41 are Class II objects and there are two Class I objects among the X-ray sources. In addition, 69 of the X-ray sources are associated with stars with normal photospheres (Class III objects). About 7 sources were detected by all 3 instruments. We find evidence of radio flaring unaccompanied by X-ray variability. We discuss the nature of radio emission from pre-main sequence stars and its relation to diagnostics of disks and magnetic activity.
Support for this work was provided by NASA through Hubble Fellowship grant # HF-01189.01 under contract NAS5-26555(RAO) and Chandra award GO5-6018X and NASA contract # NAS8-03060 (SJW) and under NASA contract 1256790 issued by JPL (STM).
Gutermuth Robert
Megeath Thomas S.
Osten Rachel Ann
Winston E. M.
Wolk Scott J.
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