J/ApJS/160/450 X-ray emission in Orion Nebula young stars (Flaccomio+, 2005)
Rotational modulation of X-ray emission in Orion Nebula young stars.
Flaccomio E., Micela G., Sciortino S., Feigelson E.D., Herbst W.,
Favata F., Harnden F.R.JR, Vrtilek S.D.
<Astrophys. J. Suppl. Ser., 160, 450-468 (2005)>
=2005ApJS..160..450F 2005ApJS..160..450F
ADC_Keywords: X-ray sources ; Clusters, open ; Stars, pre-main sequence ;
Equivalent widths
Keywords: open clusters and associations: individual (Orion Nebula Cluster) -
stars: activity - stars: low-mass, brown dwarfs -
stars: pre-main-sequence - X-rays: stars
Abstract:
We investigate the spatial distribution of X-ray-emitting plasma in
a sample of young Orion Nebula Cluster stars by modulation of their
X-ray light curves due to stellar rotation. The study, part of the
Chandra Orion Ultradeep Project (COUP, Cat. J/ApJS/160/319), is made
possible by the exceptional length of the observation: 10 days of ACIS
integration during a time span of 13 days, yielding a total of 1616
detected sources in the 17'x17' field of view. We here focus on a
subsample of 233 X-ray-bright stars with known rotational periods. We
search for X-ray modulation using the Lomb Normalized Periodogram
method.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 295 COUP sources with assigned rotational period.
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See also:
J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)
J/A+A/396/513 : Stellar Rotation in the Orion Nebula Cluster (Herbst+, 2002)
J/AJ/117/2941 : Rotation periods of Orion PMS stars (Stassun+, 1999)
J/AJ/121/3160 : JHK photometry near the Trapezium region (Carpenter+, 2001)
J/ApJS/160/319 : COUP: observations and source lists (Getman+, 2005)
J/ApJ/582/382 : Chandra X-ray sources in Orion Nebula Cluster
(Flaccomio+, 2003)
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 source number
6- 10 I5 ct Cts Net (background subtracted) ACIS counts
12- 16 I5 --- OptId ? Optical identification (1)
17 A1 --- m_OptId [ab] Multiplicity indicator (1)
19- 23 F5.2 d Per Optically determined rotation period
25 A1 --- n_Per Note on Per (2)
27- 30 A4 --- r_Per Reference for Per (3)
32- 36 F5.2 solMass Mass ? Stellar mass
38- 40 F3.1 [yr] LogAge ? Log of the stellar age
42- 45 F4.1 [10-7W] LogLx ? Log of the X-ray luminosity in erg/s
47- 50 F4.1 [-] Log(Lx/Lb) ? Log of the X-ray to bolometric
luminosity ratio
52- 56 F5.1 0.1nm WCaII ? Ca II line equivalent width in Angstroms
58- 60 A3 --- Mod The X-ray modulation flag (4)
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Note (1): Identification number from Hillenbrand (1997, Cat. J/AJ/113/1733),
Herbst+ (2002, Cat. J/A+A/396/513).
Note (2): Indicates other periods reported in the literature when differing by
more than 10% from Per. References (note 3) are given in parentheses.
Note on Per, defined as follows:
a = 2.99 (Carpenter et al. 2001, Cat. J/AJ/121/3160);
b = 1.40 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
c = 2.85 (Carpenter et al. 2001, Cat. J/AJ/121/3160);
d = 20.10 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
e = 1.57 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
f = 7.78 (Stassun et al. 1999, Cat. J/AJ/117/2941);
g = 13.43 (Carpenter et al. 2001, Cat. J/AJ/121/3160);
h = 5.59 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
i = 2.13 (Stassun et al. 1999, Cat. J/AJ/117/2941);
j = 11.19 (Carpenter et al. 2001, Cat. J/AJ/121/3160);
k = 4.00 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
l = 2.40 (Carpenter et al. 2001, Cat. J/AJ/121/3160);
m = 9.04 (Carpenter et al. 2001, Cat. J/AJ/121/3160);
n = 1.55 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
o = 5.76 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
p = 8.69 (Stassun et al. 1999, Cat. J/AJ/117/2941);
q = 0.84 (Stassun et al. 1999, Cat. J/AJ/117/2941 ;
Herbst et al. 2002, Cat. J/A+A/396/513);
r = 0.66 (Herbst et al. 2002, Cat. J/A+A/396/513);
s = 3.51 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
t = 0.85 (Stassun et al. 1999, Cat. J/AJ/117/2941 ;
Herbst et al. 2002, Cat. J/A+A/396/513);
u = 8.44 (Herbst et al. 2000AJ....119..261H 2000AJ....119..261H);
Note (3): Reference for Per, defined as follows:
H = Herbst et al. (2002, Cat. J/A+A/396/513);
h = Herbst et al. (2000AJ....119..261H 2000AJ....119..261H);
s = Stassun et al. (1999, Cat. J/AJ/117/2941);
c = Carpenter et al. (2001, Cat. J/AJ/121/3160);
U = W. Herbst (unpublished).
Note (4): Indicates filtered light curves (N,L or H) for which the LNP analysis
yielded FAP<0.1%. A '+' indicates that the periodogram analysis
was not performed because either Per<2.0d or Cts<100.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 05-Jul-2006