Chandra X-Ray Observations of Young Clusters. II. Orion Flanking Fields Data

August 2004 • 2004AJ....128..787R

Authors • Ramírez, Solange V. • Rebull, Luisa • Stauffer, John • Strom, Stephen • Hillenbrand, Lynne • Hearty, Thomas • Kopan, Eugene L. • Pravdo, Steven • Makidon, Russell • Jones, Burton

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.

Links

• PREPRINT http://arxiv.org/abs/astro-ph/0405003
• ELECTR https://doi.org/10.1086%2F422349
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2004AJ....128..787R
• PDF https://stacks.iop.org/1538-3881/128/787/pdf
• DATA http://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/128/787
• DATA https://cda.harvard.edu/chaser?obsid=2548,2549
• DATA https://irsa.ipac.caltech.edu/bibdata/2004/R/2004AJ....128..787R.html
• SPIRES http://inspirehep.net/search?p=find+eprint+astro-ph/0405003