J/AJ/107/2120 JHK photometry of the OMC2 region (Jones+ 1994)
A near infrared survey of the OMC2 region
Jones T.J., Mergen J., Odewahn S., Gehrz R.D., Gatley I.,
Merrill K.M., Probst R., Woodward C.E.
<Astron. J. 107, 2120 (1994)>
=1994AJ....107.2120J 1994AJ....107.2120J (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, infrared
Abstract:
We present an unbiased survey at 1.25-2.2um of a 0.025sq.deg. region
surrounding the core of Orion Molecular Cloud 2 (OMC-2). Analysis of
the source counts and colors indicates that the majority of the
sources brighter than K=+13 are not field stars. They must be members
of a young association or associations within the survey area. The K
band luminosity function (corrected for field star contamination using
model calculations) exhibits a drop in counts at magnitudes fainter
than K=+13 (∼0.15L☉). This is most easily explained by assuming
that the association(s) are young. The lowest mass stars simply have
not yet reached the main sequence. The distribution of colors across
the region shows moderate correlation with molecular gas, but both
reddened and unreddened stars are present along most lines of sight.
Considerable reflection nebulosity is present in the region of the
core cluster of OMC2 itself. Of particular interest are the thin
streamers emanating from the star J9, which may be the remnant of a
bipolar nebula produced by the star in the recent past.
Objects:
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RA (2000) DE Designation(s)
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05 35 27 -05 10.1 OMC 2 = GAL 208-19.2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 55 219 Source list
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Identitication number
5 I1 h RAh Right ascension (1950)
7- 8 I2 min RAm Right ascension (1950)
10- 13 F4.1 s RAs Right ascension (1950)
15 A1 --- DE- Declination sign
16 I1 deg DEd Declination (1950)
18- 19 I2 arcmin DEm Declination (1950)
21- 22 I2 arcsec DEs Declination (1950)
24- 28 F5.2 mag Jmag ? J magnitude (1.20 µm)
30- 33 F4.2 mag e_Jmag ? rms uncertainty on Jmag
35- 39 F5.2 mag Hmag ? H magnitude (1.62 µm)
41- 44 F4.2 mag e_Hmag ? rms uncertainty on Hmag
46- 50 F5.2 mag Kmag ? K magnitude (2.20 µm)
52- 55 F4.2 mag e_Kmag ? rms uncertainty on Kmag
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 07-Mar-1997