J/A+A/515/A56 NGC 346/N66 JHKs photometry (Gouliermis+, 2010)
Recent star formation in low metallicities. The star-forming region NGC 346/N66
in the Small Magellanic Cloud from near-infrared VLT/ISAAC observations.
Gouliermis, D.A., Bestenlehner, J.M., Brandner, W., Henning, T.
<Astron. Astrophys. 515, A56 (2010)>
=2010A&A...515A..56G 2010A&A...515A..56G
ADC_Keywords: Magellanic Clouds ; Clusters, open ; H II regions ;
Stars, pre-main sequence ; Photometry, infrared
Keywords: stars: pre-main-sequence - Magellanic Clouds -
open clusters and associations: individual: NGC 346 - HII regions -
ISM: individual objects: LHA 115-N66 - catalogs
Abstract:
The emission nebula N66 is the brightest HII Region in the Small
Magellanic Cloud (SMC), with the stellar association NGC 346 located
in its center. The youthfulness of the region NGC 346/N66 is well
documented by studies of the gas and dust emission, and the detection
in the optical of a rich sample of pre-main sequence (PMS) stars, and
in the mid- and far-IR of Young Stellar Objects (YSOs). However, there
is a lack of a comprehensive study of this region in the near-IR that
will bridge the previous surveys.
We perform a photometric analysis on deep, seeing-limited near-IR VLT
images of the region NGC 346/N66 and a nearby control field of the SMC
in order to locate the centers of active high- and intermediate-mass
star formation through the identification of near-IR bright objects as
candidate stellar sources under formation.
We use archived imaging data obtained with the high-resolution camera
ISAAC at VLT of NGC 346/N66 and we construct the near-IR
color-magnitude (CMD) and color-color diagrams (C-CD) of all detected
sources. We investigate the nature of all stellar populations in the
observed CMDs, and we identify all stellar sources that show
significant near-IR excess emission in the observed C-CD. We select,
thus, the best candidates for being young stellar sources. Results.
Based on their near-IR colors we select 263 candidate young stellar
sources. This sample comprises a variety of objects such as
intermediate-mass PMS and Herbig Ae/Be stars and possibly massive
YSOs, providing original near-IR colors for them. The spatial
distribution of the selected candidate sources shows that they are
located along the dusty filamentary structures of N66 seen in mid- and
far-IR dust emission and agrees very well with that of previously
detected candidate YSOs and PMS stars.
Description:
Photometric parameters for 2506 stars identified with VLT/ISAAC in the
vicinity of the star-forming region NGC 346/N66 in the Small
Magellanic Cloud are presented. Photometry in the filters J, H and Ks
is performed. For each star equatorial coordinates, pixel coordinates,
magnitudes and the corresponding photometric uncertainties in each
filter are given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 2506 Photometric parameters for 2506 stars in
NGC 346/N66 from VLT/ISAAC imaging
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See also:
J/PASP/98/1133 : The open cluster NGC 346 (Niemela+, 1986)
J/AJ/98/1305 : Stellar content of NGC 346 (Massey+, 1989)
J/A+A/456/623 : VLT-FLAMES survey of massive stars (Evans+, 2006)
J/ApJS/166/549 : HST/ACS observations of NGC 346 (Gouliermis+, 2006)
J/AJ/133/44 : NGC 346 HST VI photometry (Sabbi+, 2007)
J/ApJ/669/327 : S3MC: YSOs in N66, in SMC (Simon+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID ID number of each star
6- 13 F8.5 deg RAdeg Right ascension in decimal degrees (J2000.0)
15- 23 F9.5 deg DEdeg Declination in decimal degrees (J2000.0)
25- 32 F8.3 pix Xpix X pixel coordinate
34- 41 F8.3 pix Ypix Y pixel coordinate
43- 48 F6.3 mag Jmag J band magnitude
50- 54 F5.3 mag e_Jmag J band magnitude error
56- 61 F6.3 mag Hmag H band magnitude
63- 67 F5.3 mag e_Hmag H band magnitude error
69- 74 F6.3 mag Ksmag Ks band magnitude
76- 80 F5.3 mag e_Ksmag Ks band magnitude error
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Acknowledgements:
Dimitrios A. Gouliermis, dgoulier(at)mpia.de
(End) Patricia Vannier [CDS] 08-Jun-2010