J/A+A/539/A119 Pismis 24 stars with X-ray emission (Fang+, 2012)
Star formation and disk properties in Pismis 24.
Fang M., van Boekel R., King R.R., Henning T., Bouwman J., Doi Y.,
Okamato Y.K., Roccatagliata V., Sicilia-Aguilar A.
<Astron. Astrophys. 539, A119 (2012)>
=2012A&A...539A.119F 2012A&A...539A.119F
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; X-ray sources ;
Photometry, infrared
Keywords: stars: pre-main sequence - proto-planetary disks - surveys -
open clusters and associations: individual: Pismis 24
Abstract:
Circumstellar disks are expected to evolve quickly in massive young
clusters harboring many OB-type stars. Two processes have been
proposed to drive the disk evolution in such cruel environments: (1)
gravitational interaction between circumstellar disks and nearby
passing stars (stellar encounters), and (2) photoevaporation by UV
photons from massive stars. The relative importance of both mechanisms
is not well understood. Studies of massive young star clusters can
provide observational constraints on the processes of driving disk
evolution.
We investigate the properties of young stars and their disks in the
NGC 6357 complex, concentrating on the most massive star cluster
within the complex: Pismis 24.
Description:
We use infrared data from the 2MASS and Spitzer GLIMPSE surveys,
complemented with our own deep Spitzer imaging of the central regions
of Pismis 24, in combination with X-ray data to search for young
stellar objects (YSOs) in NGC 6357 complex. The infrared data
constrain the disk presence and are complemented by optical
photometric and spectroscopic observations, obtained with VLT/VIMOS,
that constrain the properties of the central stars.
The R-band observations were performed on 2008 April 1 and 6, and the
I-band observations were done on 2008 May 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 139 643 Photometric magnitudes for stars with X-ray
emission in Pismis 24
table3.dat 52 151 Stellar parameters for X-ray emissing stars with
spectral types in Pismis 24
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJS/168/100 : X-ray study of star-forming region NGC 6357 (Wang+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/643] Sequential number
5- 7 I3 --- W07 [1/778] Wang et al. 2007 (Cat. J/ApJS/168/100)
number (<[WTF2007] NNN> in Simbad)
9- 12 F4.2 arcsec off Distance between X-ray source and
optical/infrared counterpart
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 24 F5.2 s RAs Right ascension (J2000)
26 A1 --- DE- Declination sign (J2000)
27- 28 I2 deg DEd Declination (J2000)
30- 31 I2 arcmin DEm Declination (J2000)
33- 36 F4.1 arcsec DEs Declination (J2000)
38- 43 F6.3 mag Rmag ?=- VIMOS R magnitude
45- 49 F5.3 mag e_Rmag ?=- rms uncertainty on Rmag
51- 56 F6.3 mag Imag ?=- VIMOS I magnitude
58- 62 F5.3 mag e_Imag ?=- rms uncertainty on Imag
64- 68 F5.2 mag Jmag ?=- 2MASS J magnitude
70- 73 F4.2 mag e_Jmag ?=- rms uncertainty on Jmag
75- 79 F5.2 mag Hmag ?=- 2MASS H magnitude
81- 84 F4.2 mag e_Hmag ?=- rms uncertainty on Hmag
86- 90 F5.2 mag Ksmag ?=- 2MASS Ks magnitude
92- 95 F4.2 mag e_Ksmag ?=- rms uncertainty on Ksmag
97-101 F5.2 mag [3.6] ?=- IRAC 3.6um magnitude
103-106 F4.2 mag e_[3.6] ?=- rms uncertainty on [3.6]
108-112 F5.2 mag [4.5] ?=- IRAC 4.5um magnitude
114-117 F4.2 mag e_[4.5] ?=- rms uncertainty on [4.5]
119-123 F5.2 mag [5.8] ?=- IRAC 5.8um magnitude
125-128 F4.2 mag e_[5.8] ?=- rms uncertainty on [5.8]
130-134 F5.2 mag [8.0] ?=- IRAC 8.0um magnitude
136-139 F4.2 mag e_[8.0] ?=- rms uncertainty on [8.0]
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number
5- 7 I3 --- W07 Wang et al. (2007, Cat. J/ApJS/168/100)
identification number ([WTF2007] NNN)
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 31 F4.1 arcsec DEs Declination (J2000)
33- 34 A2 --- SpT MK spectral type
36- 41 F6.3 mag Av ?=- Absorption in V band
43- 47 F5.3 Msun Mass ?=- Mass
49- 52 F4.1 Myr Age ?=- Age
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Feb-2012