CDROM/AJ/V113/P1788
Near-IR Imaging Survey of NGC 2282 (Horner+ 1997)
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A Near-Infrared Imaging Survey of NGC 2282
Donald J. Horner, Elizabeth A. Lada, Charles J. Lada
<1997, AJ, 113, 1788>
=1997AJ....113.1788H
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Abstract:
We present the first near-infrared (JHK) imaging and photometry of a
young cluster associated with NGC 2282, a reflection nebula in
Monoceros. Our observations reveal that the cluster is centrally
concentrated with a surface density that falls as 1/r. The cluster
has a radius of roughly 1.6 pc and contains at least 100 members,
approximately 9% of which exhibit infrared excess emission
characteristic of young stellar objects. Infrared extinction maps
suggest that the cluster is located at the edge of a molecular cloud
and is not heavily reddened. We construct the K-band luminosity
function (KLF) of the cluster and find that it increases with magnitude
up to the completeness limit of our observations (m_(K)=15.0). The
shape of the KLF is similar to those of other young clusters, such as
IC 348 and the Trapezium, which suggest that the cluster contains a
significant population of pre-main sequence stars. However, at the
distance of NGC 2282 (1.7 kpc) our observations are not deep enough to
sample the low mass end of the cluster IMF. Consequently, our KLF does
not provide meaningful constraints on either the age of the cluster or
the duration of star formation within it. On the other hand, the low
extinction toward the cluster, its location at the edge of a molecular
cloud, and the relatively small fraction of infrared excess sources
suggest that it is a relatively evolved cluster of pre-main-sequence
stars with an age of 5-10 x 10^(6) years. (Copyright) 1997 American
Astronomical Society.
File Summary:
------------------------------------------------------------------------------File Name
Lrecl
Records
Explanations
------------------------------------------------------------------------------table3.dat
59
394
1995 1.5 meter telescope CIRIM data
table3.tex
144
417
AASTeX version of table3.dat
------------------------------------------------------------------------------Byte-by-byte Description of file: table3.dat
------------------------------------------------------------------------------Bytes Format Units
Label
Explanations
------------------------------------------------------------------------------1- 3
I3
--Num
Source number
4
A1
--Note
*[a-f] Note flag
5- 6
I2
h
RAh
Right ascension, J2000
7- 9
I3
min
RAm
R.A.
10-14
F5.1
s
RAs
R.A.
15
1X
----Blank
16
A1
--DESign of Declination, J2000
17
I1
deg
DEd
Declination
18-20
I3
arcmin DEm
Declination
21-23
I3
arcsec DEs
Declination
24-30
F7.2
mag
J
*[]? J magnitude
31-35
F5.2
mag
e_J
[]? Error in J
36-42
F7.2
mag
H
[]? H magnitude
43-47
F5.2
mag
e_H
[]? Error in H
48-54
F7.2
mag
K
[]? K magnitude
55-59
F5.2
mag
e_K
[]? Error in K
------------------------------------------------------------------------------Notes for file: table3.dat
------------------------------------------------------------------------------Note:
a - Source 137: nebulous object A
b - Source 177: HD 289120, the central star illuminating the
reflection nebula
c - Source 275: nebulous object B/EQ 0644.3+0121
d - Source 295: nebulous object C
e - Source 314: nebulous object D
f - Source 328: V507 Mon, spectroscopic binary
J:
No color correction has been applied to the J-band magnitudes.
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(End)
Lee Brotzman [ADS] 02May-1997