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J/ApJ/660/704   Optical and X-ray variability of ONC PMS     (Stassun+, 2007)

A simultaneous optical and X-ray variability study of the Orion nebula cluster. II. A common origin in magnetic activity. Stassun K.G., Van Den Berg M., Feigelson E. <Astrophys. J., 660, 704-711 (2007)> =2007ApJ...660..704S
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; X-ray sources Keywords: open clusters and associations: individual (Orion Nebula Cluster) - stars: flare - stars: magnetic fields - stars: pre-main sequence - stars: spots - X-rays: stars Abstract: We present a statistical analysis of simultaneous optical and X-ray light curves, spanning 600ks, for 814 pre-main-sequence (PMS) stars in the Orion Nebula Cluster. The aim of this study is to establish the relationship, if any, between the sites of optical and X-ray variability and thereby to elucidate the origins of X-ray production in PMS stars. Description: A complete description of our database of simultaneous X-ray and optical light curves is provided in Paper I, Stassun et al., 2006ApJ...649..914S. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 37 814 Optical and X-Ray Variability in Study Sample
See also: J/ApJS/160/319 : COUP: observations and source lists (Getman+, 2005) J/AJ/116/1816 : JHKLMNOPQ photometry in Orion cluster (Hillenbrand+, 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- COUP The COUP identification number (J/ApJS/160/319) 6- 10 A5 --- OptID Optical identification from COUP (1) 12- 16 F5.2 --- J The J-statistic value (see section 2.1.2) 18- 19 A2 --- l_logP [≤ ] Limit flag on logP 21- 25 F5.2 [-] logP K-S test probability of X-ray variability (2) 27- 31 F5.1 --- BB Ratio of max/min X-ray flux from BB analysis (3) 33- 37 F5.1 0.1nm Ca2 ? The CaII IR triplet equivalent width (4)
Note (1): 0-9999 from Hillenbrand (1997, Cat. J/AJ/113/1733, [H97b] NNNNN in Simbad 10000-11000 from Herbst et al. (2002, Cat. J/A+A/396/513) Note (2): See section 2.1.1. Values below -4.00 have been truncated (Getman et al., 2005, Cat. J/ApJS/160/319). Note (3): See section 2.1.1. Note (4): In angstroms. Negative values indicate emission. See Hillenbrand et al. (1998, Cat. J/AJ/116/1816).
History: From electronic version of the journal References: Stassun et al., Paper I 2006ApJ...649..914S
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 05-Mar-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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