J/A+A/506/711 Canis Major R1 X-ray sources (Gregorio-Hetem+, 2009)
Star formation history of Canis Major R1.
I. Wide-field X-ray study of the young stellar population.
Gregorio-Hetem J., Montmerle T., Rodrigues C.V., Marciotto E.,
Preibisch T., Zinnecker H.
<Astron. Astrophys., 506, 711-727 (2009)>
=2009A&A...506..711G 2009A&A...506..711G
ADC_Keywords: Associations, stellar ; X-ray sources ; Stars, pre-main sequence ;
Photometry, infrared
Keywords: stars: pre-main sequence - X-rays: stars - infrared: stars -
ISM: clouds
Abstract:
The CMa R1 star-forming region contains several compact clusters as
well as many young early-B stars. It is associated with a well-known
bright rimmed nebula, the nature of which is unclear (fossil HII
region or supernova remnant). To help elucidate the nature of the
nebula, our goal was to reconstruct the star-formation history of the
CMa R1 region, including the previously unknown older, fainter
low-mass stellar population, using X-rays.
We analyzed images obtained with the ROSAT satellite, covering
∼5deg2. Complementary VRI photometry was performed with the Gemini
South telescope. Colour-magnitude and colour-colour diagrams were used
in conjunction with pre-main sequence evolutionary tracks to derive
the masses and ages of the X-ray sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 93 98 X-ray sources detected in CMa R1 by ROSAT
tablea2.dat 47 16 List of ROSAT sources observed by XMM-Newton or
Chandra
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See also:
IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- CMaX [1/98] Source name (1)
3 A1 --- n_CMaX [*] *: Relevant sources: H-K excess
4 A1 --- X [x] x: Objects detected by XMM-Newton and/or
Chandra
5- 6 A2 --- Note Individual notes on CMaX (2)
8- 9 I2 arcsec Err Diameter of the position error circle
11- 14 F4.1 ct/ks CRate X-ray count rate
16- 18 F3.1 ct/ks e_CRate rms uncertainty on CRate
20- 23 F4.1 --- S/N X-ray signal-to-noise ratio
25- 29 F5.2 [10-7W] logLX X-ray luminosity
31- 32 I2 h RAh Optical counterpart Right ascension (J2000)
34- 35 I2 min RAm Optical counterpart Right ascension (J2000)
37- 40 F4.1 s RAs Optical counterpart Right ascension (J2000)
42 A1 --- DE- Optical counterpart Declination sign (J2000)
43- 44 I2 deg DEd Optical counterpart Declination (J2000)
46- 47 I2 arcmin DEm Optical counterpart Declination (J2000)
49- 50 I2 arcsec DEs Optical counterpart Declination (J2000)
51 A1 --- uc [)] Uncertainty flag on optical position
53- 56 F4.1 mag Rmag ?=- R magnitude
58- 60 F3.1 mag AV ?=- Extinction in V band
62- 65 F4.1 mag Jmag ?=- 2MASS J magnitude
67- 70 F4.1 mag Hmag ?=- 2MASS H magnitude
72- 75 F4.1 mag Kmag ?=- 2MASS K magnitude
77 A1 --- l_Age Limit flag on Age
78- 79 I2 Myr Age ? Age estimation based on near-IR data
80 A1 --- --- [-]
81- 82 I2 Myr Age2 ? Second value of Age when interval
83 A1 --- u_Age [?] Uncertainty flag on Age
85 A1 --- l_Mass Limit flag on Mass
86- 88 F3.1 solMass Mass ? Mass estimation based on near-IR data
89 A1 --- --- [-]
90- 92 F3.1 solMass Mass2 ? Second value of Mass when interval
93 A1 --- u_Mass [?] Uncertainty flag on Mass
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Note (1): CMaX 1 to 56 (Field 1), CMaX 62 to 98 (Field 2),
CMaX 57 to 61 (both fields)
Note (2): Notes (here [C74] indicates Claria 1974AJ.....79.1022C 1974AJ.....79.1022C, and
[SEI99] Shevchenko et al., 1999, Cat. J/MNRAS/310/210), as follows:
a = HD 51896 (F5)
b = SS 75
c = HD 52014 (F5)
d = HD 52385 (K0)
e = GU CMa, HD 52721 (B2V), [C74] 63 , [SEI99] 158
f = FZ CMa (B2.5), [C74] 67, [SEI99] 159
g = Z CMa (Bpe), [C74] 76, [SEI99] 161
h = BD -111762 (B2), [C74] 77, [SEI99] 92
i = [C74] 14, [SEI99] 94
j = Member of cluster vdB-RN92 (VDB 92 in Simbad)
k = Member of cluster BRC 27 (NAME BRC 27 STAR CLUSTER in Simbad)
l = [SEI99] 99
m = Member of cluster NGC 2327
n = [SEI99] 111
o = HD 53339 (B3), C84, [SEI99]
p = HD 53396 (B9), [SEI99] 112
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- CMaX [1/98] Source name
4- 19 A16 --- 2MASS 2MASS name
21- 23 A3 --- Num Source number (CNN or XNN) (1)
25- 26 I2 h RAh Right ascension (J2000) (2)
28- 29 I2 min RAm Right ascension (J2000) (2)
31- 35 F5.2 s RAs Right ascension (J2000) (2)
37 A1 --- DE- Declination sign (J2000) (2)
38- 39 I2 deg DEd Declination (J2000) (2)
41- 42 I2 arcmin DEm Declination (J2000) (2)
44- 47 F4.1 arcsec DEs Declination (J2000) (2)
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Note (1): Source number in the Chandra (C) or XMM-Newton (X) images.
Note (2): Positional deviations from the coordinates of near-IR counterparts
(2MASS) are less than 2" arcsec for Chandra sources and less than 3".
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Jan-2010