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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 80 2506 Photometric parameters for 2506 stars in NGC 346/N66 from VLT/ISAAC imaging
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
Bytes Format Units Label Explanations
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
Acknowledgements: Dimitrios A. Gouliermis, dgoulier(at)
(End) Patricia Vannier [CDS] 08-Jun-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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