J/MNRAS/396/964 T Tauri in and around bright-rimmed clouds (Chauhan+, 2009)
Triggered star formation and evolution of T-Tauri stars in and around
bright-rimmed clouds.
Chauhan N., Pandey A.K., Ogura K., Ojha D.K., Bhatt B.C., Ghosh S.K.,
Rawat P.S.
<Mon. Not. R. Astron. Soc., 396, 964-983 (2009)>
=2009MNRAS.396..964C 2009MNRAS.396..964C
ADC_Keywords: Molecular clouds ; Stars, pre-main sequence ;
Photometry, infrared ; Photometry, millimetric/submm
Keywords: stars: evolution - stars: formation - stars: pre-main-sequence -
H II regions
Abstract:
The aim of this paper is to quantitatively testify the 'small-scale
sequential star formation' hypothesis in and around bright-rimmed
clouds (BRCs). As a continuation of the recent attempt by Ogura et
al. (2007PASJ...59..199O 2007PASJ...59..199O), we have carried out BVIc photometry of four
more BRC aggregates along with deeper re-observations of two
previously observed BRCs. Again, quantitative age gradients are found
in almost all the BRCs studied in the present work. Archival
Spitzer/Infrared Array Camera data also support this result.
Description:
BVIc CCD observations of BRCs 2, 11NE, 13, 14 and 27 were carried out
using the 2048x2048pixel2 CCD camera mounted on 2.0-m Himalayan
Chandra Telescope (HCT) of the Indian Astronomical Observatory (IAO),
Hanle, India on 2006 October 27 and 28. The instrument Himalaya Faint
Object Spectrograph Camera (HFOSC) was used in the imaging mode.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 147 133 B, V and Ic photometric data for the stars
along with their positions, EWs and
corresponding 2MASS data
table4.dat 85 133 Dereddened magnitude, colours, age and mass of
the YSOs associated with the BRCs
table6.dat 88 178 IRAC photometric magnitudes of the disk bearing
candidates in BRCs 2, 27 and 13/14
table7.dat 117 242 J, H and K magnitudes of the sources used in
the analysis (cf. Sect. 6.2)
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/AJ/123/2597 : Hα stars and HH objects near BRCs (Ogura+, 2002)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- BRC Cloud name (BRCNNWW)
9- 11 I3 --- Seq Source sequential number,
[CPO2009] NNN in Simbad
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 22 F4.1 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 34 F4.1 arcsec DEs Declination (J2000)
36- 41 F6.3 mag Bmag ? Johnson B magnitude
43- 47 F5.3 mag e_Bmag ? rms uncertainty on Bmag
49- 54 F6.3 mag Vmag ? Johnson V magnitude
56- 60 F5.3 mag e_Vmag ? rms uncertainty on Vmag
62- 67 F6.3 mag Icmag ? Cousins I magnitude
69- 73 F5.3 mag e_Icmag ? rms uncertainty on Icmag
75- 80 F6.2 0.1nm EWHa ? Halpha equivalent width
82- 97 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs)
99-104 F6.3 mag Jmag 2MASS J magnitude
106-110 F5.3 mag e_Jmag rms uncertainty on Jmag
112-117 F6.3 mag Hmag 2MASS H magnitude
119-123 F5.3 mag e_Hmag rms uncertainty on Hmag
125-130 F6.3 mag Kmag 2MASS Ks magnitude
132-136 F5.3 mag e_Kmag rms uncertainty on Kmag
138-140 A3 --- Qflag 2MASS quality flags
142-144 A3 --- Cflag 2MASS contamination and confusion flag
146-147 I2 --- [OSP2002] ? Ogura et al. (2002, Cat. J/AJ/123/2597)
number, [OSP2002] BRC NNWW NN in Simbad
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- BRC Cloud name (BRCNNWW)
9- 11 I3 --- Seq Source sequential number,
[CPO2009] NNN in Simbad
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 22 F4.1 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 34 F4.1 arcsec DEs Declination (J2000)
36- 41 F6.3 mag V0mag Dereddened Johnson V magnitude
43- 47 F5.3 mag (B-V)0 ? Dereddened Johnson B-V colour index
49- 53 F5.3 mag (V-Ic)0 ? Dereddened Johnson-Cousins V-I colour index
55- 58 F4.2 mag AV Absorption in V band
60- 62 F3.1 mag e_AV ? rms uncertainty on AV
64 A1 --- l_Age Limit flag on Age
65- 68 F4.1 Myr Age Age
70- 72 F3.1 Myr e_Age ? rms uncertainty on Age
74- 77 F4.2 solMass Mass ? Mass
79- 82 F4.2 solMass e_Mass ? rms uncertainty on Mass
84- 85 I2 --- [OSP2002] ? Ogura et al. (2002, Cat. J/AJ/123/2597)
number, [OSP2002] BRC NNWW NN in Simbad
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- BRC Cloud name (BRCNNWW)
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 39 F6.3 mag [3.6] Spitzer/IRAC 3.6um magnitude
41- 45 F5.3 mag e_[3.6] rms uncertainty on [3.6]
47- 52 F6.3 mag [4.5] Spitzer/IRAC 4.5um magnitude
54- 58 F5.3 mag e_[4.5] rms uncertainty on [4.5]
60- 65 F6.3 mag [5.8] Spitzer/IRAC 5.8um magnitude
67- 71 F5.3 mag e_[5.8] rms uncertainty on [5.8]
73- 78 F6.3 mag [8.0] Spitzer/IRAC 8.0um magnitude
80- 84 F5.3 mag e_[8.0] rms uncertainty on [8.0]
86- 88 A3 --- Cl YSO class
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cloud Cloud name (1848E, 1848W or CMa R1)
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 49 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs)
51- 56 F6.3 mag Jmag 2MASS J magnitude
58 A1 --- leJmag Limit flag on e_Jmag
59- 63 F5.3 mag e_Jmag rms uncertainty on Jmag
65- 70 F6.3 mag Hmag 2MASS H magnitude
72 A1 --- leHmag Limit flag on e_Hmag
73- 77 F5.3 mag e_Hmag rms uncertainty on Hmag
79- 84 F6.3 mag Kmag 2MASS Ks magnitude
86 A1 --- leKmag Limit flag on e_Kmag
87- 91 F5.3 mag e_Kmag rms uncertainty on Kmag
93- 95 A3 --- Qflag 2MASS quality flags
97- 99 A3 --- Cflag 2MASS contamination and confusion flag
101-105 F5.2 mag AV Absorption in V band
107-111 F5.3 mag D(H-K) NIR excess, Δ(H-K)
113-117 A5 --- Source Source of near-IR photometry [2MASS/M06] (1)
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Note (1): Source as follows:
2MASS = 2MASS survey, Cat. II/246
M06 = Matsuyanagi et al., 2006, Cat. J/PASJ/58/29
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History:
* 30-Sep-2010: From electronic version of the journal
* 17-Mar-2011: 1 2MASS name corrected in table3
References:
Ogura et al., Paper I 2007PASJ...59..199O 2007PASJ...59..199O
(End) Patricia Vannier [CDS] 02-Aug-2010