J/AJ/132/2653 JHKs photometry of N11 young stellar objects (Hatano+, 2006)
Near-infrared observations of N11 in the Large Magellanic Cloud:
triggered star formation around the periphery of LH 9.
Hatano H., Kadowaki R., Nakajima Y., Tamura M., Nagata T., Sugitani K.,
Tanabe T., Kato D., Kurita M., Nishiyama S., Baba D., Ishihara A., Sato S.
<Astron. J., 132, 2653-2664 (2006)>
=2006AJ....132.2653H 2006AJ....132.2653H
ADC_Keywords: Magellanic Clouds ; Stars, pre-main sequence ;
Photometry, infrared
Keywords: infrared: stars - Magellanic Clouds - stars: formation -
stars: pre-main sequence
Abstract:
Near-infrared observations have been carried out to survey young
stellar objects in the second-largest HII region in the Large
Magellanic Cloud, N11. A total area of about 700 arcmin2 is covered in
the J, H, and Ks bands. We selected a total of 559 OB and 127 Herbig
Ae/Be star candidates out of the detected sources based on their
near-infrared colors and magnitudes. The existence of these young
stellar objects indicates that star formation activity is underway in
the whole N11 region. Many Herbig Ae/Be star candidates are
distributed around the periphery of the OB association LH 9. Spatial
correlations of the OB and Herbig Ae/Be star candidates with the
objects observed at other wavelengths (optical, radio continuum,
Hα, CO, and X-ray) suggest that the birth of the young stellar
populations in peripheral molecular clouds was triggered originally
by LH 9. It is likely that the trigger for this star formation was
an expanding supershell blown by the OB association. In N11 a new
generation of stars would have been formed in the clouds developed
from swept-up interstellar medium.
Description:
Imaging observations of N11 were conducted on 2002 November 2, 6, and
7 and 2005 February 4 with the NIR camera SIRIUS (Simultaneous
three-color InfraRed Imager for Unbiased Survey) installed on the IRSF
(InfraRed Survey Facility) 1.4m telescope at the South African
Astronomical Observatory in Sutherland.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 104 559 OB Star Candidates in N11
table2.dat 94 127 HAeBe Star Candidates in N11
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See also:
J/AJ/103/1205 : Stellar Content of LH 9 and 10 in the LMC (Parker+ 1992)
J/AJ/125/1940 : JHKs photometry in LMC HII region N11B (Barba+, 2003)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Type [OB HAeBe] Star type
7- 9 I3 --- [HKN2006] Running source identification number (1)
11 I1 h RAh Hour of Right Ascension (J2000)
13- 14 I2 min RAm Minute of Right Ascension (J2000)
16- 20 F5.2 s RAs Second of Right Ascension (J2000)
22 A1 --- DE- Sign of the Declination (J2000)
23- 24 I2 deg DEd Degree of Declination (J2000)
26- 27 I2 arcmin DEm Arcminute of Declination (J2000)
29- 32 F4.1 arcsec DEs Arcsecond of Declination (J2000)
34- 38 F5.2 mag Jmag The J band magnitude (2)
40- 43 F4.2 mag e_Jmag Photometric error in Jmag
45- 49 F5.2 mag Hmag The H band magnitude (2)
51- 54 F4.2 mag e_Hmag Photometric error in Hmag
56- 60 F5.2 mag Ksmag The Ks band magnitude (2)
62- 65 F4.2 mag e_Ksmag Photometric error in Ksmag
67- 71 F5.2 mag J-H The (J-H) color index (2)
73- 77 F5.2 mag H-Ks The (H-Ks) color index (2)
79-104 A26 --- Comm Additional comments (3)
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Note (1): Nomenclature note:
table1: [HKN2006] OB NNN in Simbad
table2: [HKN2006] HAeBe NNN in Simbad
Note (2): In the CTIO/CIT system.
Note (3): Comments contain the identification with the objects detected in
the previous observations. Optical PGMW numbers (with their spectral
types) are from Parker et al. (1992, Cat. J/AJ/103/1205). NIR BRRG
numbers are from Barba et al. (2003, Cat. J/AJ/125/1940).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 30-Jul-2008