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 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 2006ApJ...649..914S.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 37 814 Optical and X-Ray Variability in Study Sample
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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
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Bytes Format Units Label Explanations
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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)
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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).
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History:
From electronic version of the journal
References:
Stassun et al., Paper I 2006ApJ...649..914S 2006ApJ...649..914S
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 05-Mar-2009