J/A+A/507/1485 Young (proto)stellar population in L1630 (Mookerjea+ 2009)
Young stars and protostellar cores near NGC 2023.
Mookerjea B., Sandell G., Jarrett T.H., McMullin J.P.
<Astron. Astrophys., 507, 1485-1502 (2009)>
=2009A&A...507.1485M 2009A&A...507.1485M
ADC_Keywords: H II regions ; YSOs ; Photometry, infrared
Keywords: dust, extinction - ISM: clouds - infrared: ISM
Abstract:
We investigate the young (proto)stellar population in NGC 2023 and the
L 1630 molecular cloud bordering the H II region IC 434, using Spitzer
IRAC and MIPS archive data, JCMT SCUBA imaging and spectroscopy as
well as targeted BIMA observations of one of the Class 0 protostars,
NGC 2023 MM 1.
We study the distribution of gas, dust and young stars in this region
to see where stars are forming, whether the expansion of the H II
region has triggered star formation, and whether dense cold cores have
already formed stars.
We have performed photometry of all IRAC and MIPS images, and used
color-color diagrams to identify and classify all young stars seen
within a 22'x26' field along the boundary between IC 434 and L 1630.
Description:
The observations of NGC 2023 MM 1/MM 2 were made on Dec. 13, 1999 and
April 13, 2000 using one frequency setting in the C-array
configuration of the Berkeley-Illinois-Maryland Association (BIMA)
interferometric array.
We obtained several large scan maps (8'x8') of the NGC 2023 region
with the Submillimeter Common User Bolometer Array (SCUBA) on JCMT
during SCUBA commissioning time on four nights in December, 1997.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 154 95 Coordinates and flux densities of MIR sources
detected in the vicinity of NGC 2023
table3.dat 142 31 Coordinates and flux densities of 2MASS &
IRAC 3.6/4.5um PMS sources in NGC 2023/L 1630
table4.dat 134 10 Sources detected only in the MIPS 24um
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Byte-by-byte Description of file: table[234].dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [L1630]
6- 12 A7 --- Src Source designation: MIR-NN (table2),
NIR-NN (table3) or MIPS-NN (table4)
13 A1 --- n_Src [ac] note on source (1)
15 I1 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 I1 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
37- 41 F5.2 mag Jmag ?=- 2MASS J magnitude
43- 46 F4.2 mag e_Jmag ?=- rms uncertainty on Jmag
48- 52 F5.2 mag Hmag ?=- 2MASS H magnitude
54- 57 F4.2 mag e_Hmag ?=- rms uncertainty on Hmag
59- 63 F5.2 mag Ksmag ?=- 2MASS Ks magnitude
65- 68 F4.2 mag e_Ksmag ?=- rms uncertainty on Ksmag
70- 75 F6.2 mJy F3.6 ?=- Spitzer/IRAC 3.6um flux density
77- 80 F4.2 mJy e_F3.6 ?=- rms uncertainty on F3.6
81 A1 --- n_F3.6 [b] b: 3.6 photometry is unreliable due to
severe contamination from PAH emission
82- 88 F7.3 mJy F4.5 ?=- Spitzer/IRAC 4.5um flux density
90- 93 F4.2 mJy e_F4.5 ?=- rms uncertainty on F4.5
95-101 F7.2 mJy F5.8 ? Spitzer/IRAC 5.8um flux density
103-106 F4.2 mJy e_F5.8 ? rms uncertainty on F5.8
108-114 F7.2 mJy F8.0 ? Spitzer/IRAC 8.0um flux density
116-118 F3.1 mJy e_F8.0 ? rms uncertainty on F8.0
120-127 F8.2 mJy F24 ?=- Spitzer/MIPS 24um flux density
129-134 F6.1 mJy e_F24 ?=- rms uncertainty on F24
136-147 A12 --- OName Other name (2)
149-154 A6 --- Class Class based on selected color-color plots (3)
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Note (1): Notes as follows:
a = Hα emission line star Weaver & Babcock, 2004PASP..116.1035W 2004PASP..116.1035W
c = completely hidden in the Airy pattern of the of the exceedingly
bright star L1630MIR-72 at both 5.8 and 8.0
Note (2): sources of the names are:
* Integers correspond to NIR sources detected by
Depoy et al., 1990ApJ...356L..55D 1990ApJ...356L..55D,
* alphabet B-F are for sources identified by Sellgren 1983AJ.....88..985S 1983AJ.....88..985S,
<[S83b] NGC 2023 A> in Simbad
* WB stands for sources detected by Weaver & Babcock 2004PASP..116.1035W 2004PASP..116.1035W,
<[WB2004] NN> in Simbad
* W are sources detected by Witt et al. 1984ApJ...281..708W 1984ApJ...281..708W,
<[S83b] NGC 2023 NNN> in Simbad
* B33 names are from Bowler et al. 2009AJ....137.3685B 2009AJ....137.3685B,
<[RB84] B33-NN> in Simbad
Note (3): class is I, II, III for protostars / young stars, and 'S' for stars.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Jan-2011