Chandra Observations of the Pleiades and Other Young Clusters

Details Chandra Observations of the Pleiades and Other Young Clusters Chandra Observations of the Pleiades and Other Young Clusters

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.3406l&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #34.06; Bulletin of the American Astronomical Society, Vol. 32, p.724

Astronomy and Astrophysics

Astronomy

Scientific paper

The high sensitivity, exquisite angular resolution, 16 by 16 arcmin field of view, low background, and modest energy resolution of the ACIS-I detector make Chandra a powerful new resource for the study of young stellar clusters and associations. In the first 8 months of operation, Chandra has observed a number of young clusters ranging in age from 1x 106 to 1x 108 years, including the Pleiades, NGC 2516, Trapezium, and ρ Ophiucus. These rich images containing hundreds of detected sources provide the information needed to address a number of important questions in star formation and evolution including the shape of the initial mass function, the presence or absence of hot X-ray emitting coronae in brown dwarfs and hot stars with shallow convective zones, coronal variability and flaring as a function of stellar mass, the dependence of X-ray luminosity on age and rotation and the presence of disks, and The 60 ks ACIS-I image of the Pleiades, for example, provides 3.5σ detections down to Lx = 5x 1027 ergs, about a factor of 10 deeper than the ROSAT surveys. This low threshold permits the detection of coronae down to the end of the M dwarf sequence and beyond into the brown dwarfs. This work is supported by NASA through grant H-04630D to the University of Colorado and NIST.

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