J/ApJ/660/1532 Spitzer/IRAC-MIPS survey of NGC 2244 (Balog+, 2007)
Spitzer/IRAC-MIPS survey of NGC 2244: protostellar disk survival in the
vicinity of hot stars.
Balog Z., Muzerolle J., Rieke G.H., Su K.Y.L., Young E.T., Megeath S.T.
<Astrophys. J., 660, 1532-1540 (2007)>
=2007ApJ...660.1532B 2007ApJ...660.1532B
ADC_Keywords: Clusters, open ; Photometry, infrared
Keywords: infrared: stars -
open clusters and associations: individual (NGC 2244) -
planetary systems: protoplanetary disks - stars: pre-main sequence
Abstract:
We present the results from a survey of NGC 2244 from 3.6 to 24um
with the Spitzer Space Telescope. The 24um-8um-3.6um color composite
image of the region shows that the central cavity surrounding the
multiple O and B stars of NGC 2244 contains a large amount of cool
dust visible only at 24um. Our survey gives a detailed look at disk
survivability within the hot-star-dominated environment in this
cavity. Using mid-infrared two-color diagrams ([3.6]-[4.5] vs.
[5.8]-[8.0]), we identified 337 class II and 25 class I objects out
of 1084 objects detected in all four of these bands with photometric
uncertainty better than 10%. Including the 24um data, we found 213
class II and 20 class I sources out of 279 stars also detected at this
latter band. The center of the class II density contours is in very
good agreement with the center of the cluster detected in the 2MASS
images. We studied the distribution of the class II sources relative
to the O stars and found that the effect of high-mass stars on the
circumstellar disks is significant only in their immediate vicinity.
Description:
Observations of NGC 2244 were obtained on 2004 March 09 with IRAC.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 1084 The final photometric catalog of source detected
in all four IRAC channels
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
9- 15 F7.4 deg DEdeg Declination in decimal degrees (J2000) (1)
17- 22 F6.3 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude
24- 28 F5.3 mag e_3.6mag The 1σ error in 3.6mag
30- 35 F6.3 mag 4.5mag Spitzer/IRAC 4.5 micron band magnitude
37- 41 F5.3 mag e_4.5mag The 1σ error in 4.5mag
43- 48 F6.3 mag 5.8mag Spitzer/IRAC 5.8 micron band magnitude
50- 54 F5.3 mag e_5.8mag The 1σ error in 5.8mag
56- 61 F6.3 mag 8.0mag Spitzer/IRAC 8.0 micron band magnitude
63- 67 F5.3 mag e_8.0mag The 1σ error in 8.0mag
69- 74 F6.3 mag 24mag ? Spitzer/MIPS 24 micron band magnitude
76- 80 F5.3 mag e_24mag ? The 1σ error in 24mag
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Note (1): Objects identified as [BMR2007] DD.dddd+D.dddd in Simbad.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 18-Mar-2009