J/AJ/137/3210 Chandra observations of h Persei (Currie+, 2009)
The X-ray environment during the epoch of terrestrial planet formation:
Chandra observations of h Persei.
Currie T., Evans N.R., Spitzbart B.D., Irwin J., Wolk S.J., Hernandez J.,
Kenyon S.J., Pasachoff J.M.
<Astron. J., 137, 3210-3221 (2009)>
=2009AJ....137.3210C 2009AJ....137.3210C
ADC_Keywords: Clusters, open ; X-ray sources ; Photometry, infrared
Keywords: open clusters and associations: individual (NGC 869) -
planetary systems: formation - stars: pre-main sequence -
X-rays: stars
Abstract:
We describe Chandra/ACIS-I observations of the massive ∼13-14Myr-old
cluster, h Persei, part of the famous Double Cluster (h and χ Per)
in Perseus. Combining the list of Chandra-detected sources with new
optical/IR photometry and optical spectroscopy reveals ∼165 X-ray
bright stars with V≲23. Roughly 142 have optical magnitudes and
colors consistent with cluster membership.
Description:
Chandra observations of h Persei were taken with a 41.1ks exposure on
2004 December 2, (Obs. ID 5407; Sequence Number 200341) with the ACIS
detector (chips 0, 1, 2, 3, 6, and 7). The data were obtained in
dithered, timed mode, with a frametime of 3.2s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 115 330 Chandra/ACIS Detections
table2.dat 128 165 Catalog of Chandra sources with optical counterparts
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-)
J/A+A/394/479 : uvbyβ photometry of h and chi Per (Capilla+, 2002)
J/PASP/114/233 : h and χ Per memberships (Uribe+, 2002)
J/ApJ/576/880 : CCD UBV photometry of h and χ Per (Slesnick+, 2002)
J/ApJ/669/L33 : Hα emission sources in h and χ Per (Currie+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Source identification number
5- 11 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000)
13- 19 F7.4 deg DEdeg Declination in decimal degrees (J2000)
21- 24 I4 ct RCts Raw counts in 95% encircled energy radius
26- 31 F6.1 ct NCts Net counts in 95% encircled energy radius
33- 41 F9.4 --- HR1 ?=-999. First hardness ratio (1)
43- 51 F9.4 --- HR2 ?=-999. Second hardness ratio (1)
53- 61 F9.4 --- HR3 ?=-999. Third hardness ratio (1)
63- 68 F6.1 10+22/cm2 NH ?=-999 Hydrogen column density (2)
70- 77 F8.3 keV kT ?=-999 X-ray temperature from Sherpa (V3.4)
79- 86 F8.3 keV e_kT ?=-999 The 1σ error in kT
88- 96 E9.3 mW/m2 Funabs ?=-999 Sherpa unabsorbed X-ray flux
(erg/s/cm2)
98-106 E9.3 mW/m2 Fabs ?=-999 Sherpa absorbed X-ray flux
108-115 F8.3 --- chi2 ?=-999 Reduced χ2 of Sherpa fit
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Note (1):
* HR1 compares the full range of CXO sensitivity (0.5-2.0keV vs. 2.0-8.0keV)
* HR2 highlights differences in the softer region (0.5-1.7keV vs. 1.7-2.8keV)
* HR3 highlights differences in the harder regions (1.7-2.8keV vs. 2.8-8.0keV)
Note (2): The hydrogen column is fixed at 3E+21cm-2 based on the
well-constrained reddening to h Persei.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Source identification number
5- 11 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000)
13- 19 F7.4 deg DEdeg Declination in decimal degrees (J2000)
21- 25 F5.1 ct RCts Raw counts in 95% encircled energy radius
27- 31 F5.2 ct NCts Net counts in 95% encircled energy radius
33- 38 F6.2 [10-7W] logLX ?=-99 Log of X-ray luminosity in erg/s
40- 45 F6.2 --- SpType ?=991.90 (or 101.99) Spectral type (1)
47- 52 F6.2 --- e_SpType ?=-10 (or 99.99) The 1σ error in SpType
54- 59 F6.3 mag Jmag ?=0 2MASS J band magnitude
61- 66 F6.3 mag Hmag ?=0 2MASS H band magnitude
68- 73 F6.3 mag Ksmag ?=0 2MASS Ks band magnitude
75- 80 F6.3 mag [3.6] ?=99. Spitzer/IRAC 3.6 micron band magnitude
82- 87 F6.3 mag [4.5] ?=99. Spitzer/IRAC 4.5 micron band magnitude
89- 94 F6.3 mag [5.8] ?=99. Spitzer/IRAC 5.8 micron band magnitude
96-101 F6.3 mag [8.0] ?=99. Spitzer/IRAC 8.0 micron band magnitude
103-108 F6.3 mag Vmag The V band magnitude
110-114 F5.3 mag e_Vmag The 1σ error in Vmag
116-121 F6.3 mag Imag The I band magnitude
123-128 F6.4 mag e_Imag The 1σ error in Imag
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Note (1): The spectral types correspond to numerical spectral types: 10=B0,
20=A0, 30=F0, 40=G0, 50=K0, 60=M0, etc. The uncertainties in spectral
types are given in subclasses. Sources without spectral types and/or
photometry in a given filter have entries denoted with '99.99' or '-10'.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 26-Aug-2011