J/MNRAS/443/1614 YSOs in BRC 5, 7 and 39 (Panwar+, 2014)
Young stellar population of bright-rimmed clouds BRC 5, BRC 7 and BRC 39.
Panwar N., Chen W.P., Pandey A.K., Samal M.R., Ogura K., Ojha D.K.,
Jose J., Bhatt B.C.
<Mon. Not. R. Astron. Soc., 443, 1614-1628 (2014)>
=2014MNRAS.443.1614P 2014MNRAS.443.1614P
ADC_Keywords: Associations, stellar ; YSOs ; Photometry, infrared
Keywords: stars: formation - stars: pre-main-sequence - ISM: clouds -
HII regions - infrared: ISM
Abstract:
Bright-rimmed clouds (BRCs), illuminated and shaped by nearby OB
stars, are potential sites of recent/ongoing star formation. Here we
present an optical and infrared photometric study of three BRCs:
BRC 5, BRC 7 and BRC 39 to obtain a census of the young stellar
population, thereby inferring the star formation scenario, in these
regions. In each BRC, the Class I sources are found to be located
mostly near the bright rim or inside the cloud, whereas the Class II
sources are preferentially outside, with younger sources closer to the
rim. This provides strong support to sequential star formation
triggered by radiation-driven implosion due to the ultraviolet
radiation. Moreover, each BRC contains a small group of young stars
being revealed at its head, as the next-generation stars. In
particular, the young stars at the heads of BRC 5 and BRC 7 are found
to be intermediate-/high-mass stars, which, under proper conditions,
may themselves trigger further star birth, thereby propagating star
formation out to long distances.
Description:
VIc observations of BRCs 5, 7 and 39 were obtained using a 2048x2048
pixel CCD camera mounted at the f/13 Cassegrain focus of the 1.04-m
Sampurnanand Telescope (ST) of the Aryabhatta Research Institute of
Observational Sciences (ARIES), Nainital, India, on 17, 21, 26 and 27
October 2006.
Objects:
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RA (ICRS) DE Designation(s)
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02 29 02.16 +61 33 32.4 BRC 5 = SFO 5
02 34 48.91 +61 46 43.0 BRC 7 = SFO 7
21 46 07.12 +57 26 31.8 BRC 39 = SFO 39
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 158 252 2MASS, IRAC and WISE photometry of the
identified YSOs
table3.dat 61 104 Magnitudes and age/mass of the YSOs in the
BRC regions
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See also:
J/AJ/123/2597 : Hα stars and HH objects near BRCs (Ogura+, 2002)
J/AJ/143/61 : Hα spectroscopy in IC 1396 HII region (Nakano+, 2012)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [BRC]
5- 6 I2 --- BRC [5/39] Bright-rimmed clouds number (5, 7, 39)
8- 10 I3 --- Star [1/119] Star identification number within BRC
12- 21 F10.6 deg RAdeg Right ascension (J2000)
22- 30 F9.6 deg DEdeg Declination (J2000)
31- 35 F5.2 mag Jmag ?=99.99 2MASS J magnitude
37- 41 F5.2 mag e_Jmag ?=99.99 rms uncertainty on Jmag
43- 47 F5.2 mag Hmag ?=99.99 2MASS H magnitude
49- 53 F5.2 mag e_Hmag ?=99.99 rms uncertainty on Hmag
55- 59 F5.2 mag Kmag ?=99.99 2MASS Ks magnitude
61- 65 F5.2 mag e_Kmag ?=99.99 rms uncertainty on Kmag
67- 71 F5.2 mag [3.6] ?=99.99 Spitzer/IRAC 3.6um magnitude
73- 77 F5.2 mag e_[3.6] ?=99.99 rms uncertainty on [3.6]
79- 83 F5.2 mag [4.5] ?=99.99 Spitzer/IRAC 4.5um magnitude
85- 89 F5.2 mag e_[4.5] ?=99.99 rms uncertainty on [4.5]
91- 95 F5.2 mag [3.4] ?=99.99 WISE/W1 3.4um magnitude
97-101 F5.2 mag e_[3.4] ?=99.99 rms uncertainty on [3.4]
103-107 F5.2 mag [4.6] ?=99.99 WISE/W2 4.6um magnitude
109-113 F5.2 mag e_[4.6] ?=99.99 rms uncertainty on [4.6]
115-119 F5.2 mag [12] ?=99.99 WISE/W3 12um magnitude
121-125 F5.2 mag e_[12] ?=99.99 rms uncertainty on [12]
127-131 F5.2 mag [22] ?=99.99 WISE/W4 22um magnitude
133-137 F5.2 mag e_[22] ?=99.99 rms uncertainty on [22]
139-158 A20 --- Com Comments
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [BRC]
5- 6 I2 --- BRC [5/39] Bright-rimmed clouds number (5, 7, 39)
8- 10 I3 --- Star [1/119]? Star identification within BRC
12- 16 A5 --- ID Star identification, if not in table2 (1)
20- 24 F5.2 mag Vmag V magnitude
26- 29 F4.2 mag e_Vmag rms uncertainty on Vmag
31- 35 F5.2 mag Imag I magnitude
37- 40 F4.2 mag e_Imag rms uncertainty on Imag
42- 45 F4.2 Msun Mass Mass
47- 50 F4.2 Msun e_Mass rms uncertainty on Mass
52 A1 --- l_Age Limit flag on Age
53- 56 F4.2 Myr Age Age
58- 61 F4.2 Myr e_Age ? rms uncertainty on Age
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Note (1): ID of Hα emission stars from:
OSP = Ogura et al. (2002AJ....123.2597O 2002AJ....123.2597O, Cat. J/AJ/123/2597)
<[OSP2002] BRC NN NN> in Simbad
N = Nakano et al. (2012AJ....143...61N 2012AJ....143...61N, Cat. J/AJ/143/61)
<[NSW2012] NNN> in Simbad
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Apr-2015