Coronal Variability in the Young Cluster NGC 2516
Scott J. Wolk, F.R. Harnden Jr., S.S. Murray, N.R. Adams,
F. Damiani, E. Flaccomio, G. Micela & S. Sciortino
Institute:
Harvard-Smithsonian Center for Astrophysics
Institute:
Osservatorio Astronomico di Palermo G.S. Vaiana
Contact Email: swolk@cfa.harvard.edu
Abstract:
We discuss our ongoing analysis of Chandra observations of the
young open cluster NGC 2516. NGC 2516 was observed by Chandra to
boresight correct the spacecraft's focal plane instruments. Because of
this, CXO observed NGC 2516 with all imaging arrangements available.
In addition, it has been observed as part of the HRC
guaranteed time program and is scheduled for return boresight
calibration visits. This makes it the best cluster to study for long
term variability.
NGC 2516 is about 100 Myrs old and less than 400 pc away. We have
detected about 275
sources, almost half of which have been confirmed as cluster members.
We explore techniques of combining ACIS and HRC Chandra data for
timing analysis. We have been able to combine
almost 100 ks of observation time, spread over four epochs to study
variability in this cluster on multiple time scales.
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Manuscript submitted: 200-May-09
"The Future of Cool-Star Astrophysics', 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.
Coronal Variability
in center of the Orion Nebula Cluster [GIF Movie]