| タイトル | Chandra X-ray Observations of Young Clusters |
| 著者（英） | Hillenbrand, Lynne; Ramirez, Solange V.; Pravdo, Steven; Hearty, Thomas; Stauffer, John; Rebull, Luisa; Makidon, Russell; Kopan, Eugene L.; Jones, Burton; Strom, Stephen |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 2004-08-01 |
| 言語 | eng |
| 内容記述 | 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. |
| NASA分類 | Astronomy |
| 権利 | Copyright |
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