J/PASP/120/150 JHK photometry in Cluster [BDS2003] 107 (Hanson+, 2008)
Near-infrared spectroscopy of candidate members of the galactic cluster
[BDS2003] 107.
Hanson M.M., Bubnick B.F.
<Publ. Astron. Soc. Pac., 120, 150-159 (2008)>
=2008PASP..120..150H 2008PASP..120..150H
ADC_Keywords: Associations, stellar ; Photometry, infrared
Abstract:
We present new near-infrared classification spectra for nine candidate
members of the galactic cluster [BDS2003] 107 (Cluster 107) observed
with the IRTF SpeX instrument. We can spectroscopically classify at
least three members, two of which have published 2MASS photometry.
These two stars provide preliminary values for the approximate age
(106yr), distance (≤2kpc), and extinction (AV∼23) of the young
cluster. Based on the properties of the brightest members we have
identified, on the surface Cluster 107 appears to be very similar to
the well-studied Orion cluster. We find a single mid-O dwarf star and
a number of early-B stars, along with massive young stellar objects
(YSOs) in the field. The massive YSO Star 63 shows simultaneously an
early-B spectral classification in the short K-band with CO band-head
emission at 2.3um. This massive YSO looks similar to other luminous CO
emission objects seen in young, massive clusters through out the
Galaxy and provides additional evidence for the existence of
circumstellar disks around even fairly massive stars. Several
previously identified radio sources, presumably associated with very
early star formation, lie within this field, three of which appear to
have near-infrared counterparts as detected in images we obtained with
the SpeX acquisition camera.
Description:
Spectra were obtained 2005 June 1415 at the 3.0m NASA Infrared
Telescope Facility (IRTF) on Mauna Kea, Hawaii, using SpeX.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 129 Stars observed
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [CL 107]
8- 10 I3 --- [HB2008] Star number in cluster [BDS2003] 107
12- 17 F6.3 mag Jmag ? 2MASS J magnitude
20- 25 F6.3 mag Hmag ? 2MASS H magnitude
28- 33 F6.3 mag Kmag ? 2MASS K magnitude
34 A1 --- Note [*] Blended 2MASS photometry (1)
36- 37 I2 h RAh Right ascension (J2000)
39- 40 I2 min RAm Right ascension (J2000)
42- 46 F5.2 s RAs Right ascension (J2000)
48 A1 --- DE- Declination sign (J2000)
49- 50 I2 deg DEd Declination (J2000)
52- 53 I2 arcmin DEm Declination (J2000)
55- 58 F4.1 arcsec DEs Declination (J2000)
60- 66 A7 --- Com Comments on spectral type
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Note (1): *: Stars for which the 2MASS photometry was blended are expected
to be less reliable. See Sect. 5.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Apr-2008