J/ApJ/693/430 Near-IR photometry of Sh2-157 and Sh2-152 (Chen+, 2009)
Near-infrared imaging of the star-forming regions Sh2-157 and Sh2-152.
Chen Y., Yao Y., Yang J., Zeng Q., Sato S.
<Astrophys. J., 693, 430-446 (2009)>
=2009ApJ...693..430C 2009ApJ...693..430C
ADC_Keywords: Photometry, infrared ; H II regions ; YSOs
Keywords: ISM: individual (S152, S157) - ISM: jets and outflows -
ISM: lines and bands - stars: formation
Abstract:
Near-infrared JHK' and H2ν=1-0S(1) imaging observations of the
star-forming regions Sh2-157 and Sh2-152 are presented. The data
reveal a cluster of young stars associated with H2 line emission in
each region. Additionally, many IR point sources are found in the
dense core of each molecular cloud. Most of these sources exhibit
infrared color excesses typical of T Tauri stars, Herbig Ae/Be stars,
and protostars. Several display the characteristics of massive stars.
We calculate histograms of the K'-magnitude and [H-K'] color for all
sources, as well as two-color and color-magnitude diagrams. The
stellar populations inside and outside the clusters are similar,
suggesting that these systems are rather evolved. Shock-driven H2
emission knots are also detected, which may be related to evident
subclusters in an earlier evolutionary stage.
Description:
NIR images of Sh2-157 and Sh2-152 were taken under photometric
conditions on 1999 October 30, and 1999 November 2. We used the OASIS
instrument at the 1.88m telescope in Okayama Astronomical Observatory,
Japan. OASIS is a NIR camera and spectrometer equipped with a NICMOS3
array. The field of view is 4.2'x4.2'. Three broad-band filters, J, H,
and K' (2.16um) are employed for the observations, as well as a
narrow-band filter centered on the H2 line (2.12um)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 369 Near-infrared photometry of Sh2-152
table3.dat 45 405 Near-infrared photometry of Sh2-157
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See also:
J/other/PASA/26.439 : K-band images of star-forming regions (Longmore+, 2009)
J/MNRAS/390/1185 : JHK photometry in 2 star-forming regions (Anandarao+,
2008)
J/ApJ/596/1064 : JHKs photometry of S269 (Jiang+, 2003)
Byte-by-byte Description of file: table1.dat table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- NIRS Running sequence number
(<[CYY2009] Sh 2-15[27] NIRS NNN> in Simbad)
5- 6 I2 h RAh Hour of right ascension (J2000)
8- 9 I2 min RAm Minute of right ascension (J2000)
11- 15 F5.2 s RAs Second of right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Degree of declination (J2000)
21- 22 I2 arcmin DEm Arcminute of declination (J2000)
24- 28 F5.2 arcsec DEs Arcsecond of declination (J2000)
29- 33 F5.2 mag K'mag OASIS K'-band magnitude (2.16um)
35- 39 F5.2 mag H-K' ? OASIS H-K' color index (1)
41- 45 F5.2 mag J-H ? OASIS J-H color index
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Note (1): The sources are arranged in order of [H-K']. Among them
NIRS 1-210 (in table 1) and NIRS 1-227 (in table 3) belong to
the circle and the rest, out of it.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 09-Mar-2011