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Title: Chandra X-ray observations of young clusters : II. Orion Flanking Fields Data
Authors: Ramírez, Solange V.
Rebull, Luisa
Stauffer, John
Strom, Stephen
Hillenbrand, Lynne
Hearty, Thomas
Kopan, Eugene L.
Pravdo, Steven
Makidon, Russell
Jones, Burton
Keywords: activity
pre-main sequence
Issue Date: Aug-2004
Publisher: American Astronomical Society
Citation: The Astronomical Journal 128, 787-804, August 2004, doi: 10.1086/422349
Abstract: We present results of Chandra observations of two flanking fields (FFs) in Orion, outside the Orion Nebula Cluster (ONC). The observations were taken with the ACIS-I camera with an exposure time of about 48 ks each field. We present a catalog of 417 sources, which includes X-ray luminosity, optical and infrared photometry, and X-ray variability information. We have found 91 variable sources, 33 of which have a flarelike light curve and 11 of which have a pattern of a steady increase or decrease over a 10 hr period. The optical and infrared photometry for the stars identified as X-ray sources are consistent with most of these objects being pre–main-sequence stars with ages younger than 10 Myr. We present evidence for an age difference among the X-ray–selected samples of NGC 2264, Orion FFs, and ONC, with NGC 2264 being the oldest and ONC being the youngest.
Appears in Collections:JPL TRS 1992+

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