J/A+A/461/669 XMM observations of Cha I dark cloud (Robrade+, 2007)
A deep XMM-Newton X-ray observation of the Chamaeleon I dark cloud.
Robrade J., Schmitt J.H.M.M.
<Astron. Astrophys., 461, 669-678 (2007)>
=2007A&A...461..669R 2007A&A...461..669R
ADC_Keywords: X-ray sources ; Stars, late-type ; Stars, pre-main sequence
Keywords: stars: activity - stars: coronae - stars: late-type -
stars: pre-main sequence - X-rays: stars
Abstract:
Low-mass stars are known to exhibit strong X-ray emission during the
early stages of evolution. Nearby star forming regions are ideal
targets to study the X-ray properties of pre-main sequence stars.
Aims. A deep XMM-Newton exposure is used to investigate X-ray
properties of the pre-main sequence population of the Chamaeleon I
star forming region.
The northern-eastern fringe of the Chameleon I dark cloud was observed
with XMM-Newton, revisiting a region observed with ROSAT 15 years ago.
Centered on the extended X-ray source CHXR 49 we are able to resolve
it into three major contributing components and to analyse their
spectral properties. Furthermore, the deep exposure allows not only
the detection of numerous, previously unknown X-ray sources, but also
the investigation of variability and the study of the X-ray properties
for the brighter targets in the field. We use EPIC spectra, to
determine X-ray brightness, coronal temperatures and emission measures
for these sources, compare the properties of classical and weak-line T
Tauri stars and make a comparison with results from the ROSAT
observation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 149 71 X-ray source list in Cha I dark cloud
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
B/denis : The DENIS database (DENIS Consortium, 2005)
IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- CHXX [1/71]+ Sequential number
4- 5 I2 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 13 F4.1 s RAs Right ascension (J2000)
15 A1 --- DE- Declination sign (J2000)
16- 17 I2 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 25 F4.1 arcsec DEs Declination (J2000)
27 I1 arcsec e_Pos Positional error
29- 34 F6.3 0.1ct/s CRPN ?=- PN count-rate in 0.5-7.5keV band (1)
35 A1 --- n_CRPN [P] P if source without useful data by
the detector PN
36- 41 E6.2 ct/s CRPNs ? PN count-rate in 0.5-1.0keV band
42 A1 --- --- '/'
43- 48 E6.2 ct/s CRPNm ? PN count-rate in 1.0-2.0keV band
49 A1 --- --- '/'
50- 55 E6.2 ct/s CRPNh ? PN count-rate in 2.0-7.5keV band
57- 61 F5.3 0.1ct/s CRMOS1 ?=- MOS1 count-rate in 0.5-7.5keV band (1)
62- 63 A2 --- n_CRMOS1 [M1 ] M1 if source without useful data by
the detector M1
64- 69 E6.2 ct/s CRMOS1s ? MOS1 count-rate in 0.5-1.0keV band
70 A1 --- --- '/'
71- 76 E6.2 ct/s CRMOS1m ? MOS1 count-rate in 1.0-2.0keV band
77 A1 --- --- '/'
78- 83 E6.2 ct/s CRMOS1h ? MOS1 count-rate in 2.0-7.5keV band
85- 89 F5.3 0.1ct/s CRMOS2 ?=- MOS2 count-rate in 0.5-7.5keV band (1)
91- 97 E7.3 ct/s CRMOS2s ? MOS2 count-rate in 0.5-1.0keV band
98 A1 --- --- '/'
99-104 E6.2 ct/s CRMOS2m ? MOS2 count-rate in 1.0-2.0keV band
105 A1 --- --- '/'
106-111 E6.2 ct/s CRMOS2h ? MOS2 count-rate in 2.0-7.5keV band
113-131 A19 --- 2M/D-ID 2MASS (2M) or DENIS (D) identification (2)
133-149 A17 --- Names Other names (3)
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Note (1): Sources that are not present in a detector are marked by dashes.
Note (2): 2M for 2MASS J, D for DENIS database 3rd release
Note (3): Other names use the prefixes:
CHXR = Feigelson et al. (1993ApJ...416..623F 1993ApJ...416..623F)
Hn = Hartigan (1993AJ....105.1511H 1993AJ....105.1511H)
Sz = Schwartz (1977ApJS...35..161S 1977ApJS...35..161S)
CCE = Cambresy et al. (1998A&A...338..977C 1998A&A...338..977C), [CCE98] N-NNN in Simbad
ChaI = Lopez Marti et al. (2004, Cat. J/A+A/416/555),
[LES2004] ChaI NNN in Simbad
U = USNO-B1.0 catalog, Cat. I/284
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History:
From electronic version of the journal
* 05-Oct-2007: Original version
* 10-Dec-2007: 1 other name corrected
(End) Patricia Vannier [CDS] 31-Aug-2007