J/ApJ/672/914 HST photometry in NGC 346 (Hennekemper+, 2008)
NGC 346 in the Small Magellanic Cloud.
III. Recent star formation and stellar clustering properties in the bright
HII region N66.
Hennekemper E., Gouliermis D.A., Henning T., Brandner W., Dolphin A.E.
<Astrophys. J., 672, 914-929 (2008)>
=2008ApJ...672..914H 2008ApJ...672..914H
ADC_Keywords: Magellanic Clouds ; Associations, stellar ;
Stars, pre-main sequence ; Photometry
Keywords: galaxies: clusters: individual (NGC 346) - galaxies: star clusters -
Magellanic Clouds - stars: evolution
Abstract:
In the third part of our photometric study of the star-forming region
NGC 346/N66 and its surrounding field in the Small Magellanic Cloud
(SMC), we focus on the large number of low-mass pre-main-sequence
(PMS) stars revealed by the Hubble Space Telescope observations with
the Advanced Camera for Surveys. We investigate the origin of the
observed broadening of the PMS population in the V-I,V color-magnitude
diagram. The most likely explanations are either the presence of
differential reddening or an age spread among the young stars.
Description:
The observations used in this study, taken with HST ACS (GO Program
10248), and the photometry with the package DOLPHOT,2 is thoroughly
presented in Paper I (Gouliermis et al., Cat. J/ApJS/166/549).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 31 Photometry of OB Stars in NGC 346
table2.dat 64 16 *Candidate YSOs found with Spitzer in the area
centered on NGC 346
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Note on table2.dat: None of these objects were detected in the longer wave bands
of MIPS (70 and 160um).
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See also:
J/ApJS/166/549 : HST/ACS observations of NGC 346 (Gouliermis+, 2006)
J/ApJ/655/212 : S3MC IRAC and MIPS photometry (Bolatto+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [GDB2006] Sequential number, as in Gouliermis et al.
2006, Cat. J/ApJS/166/549
4- 5 I2 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 14 F5.2 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 27 F5.2 arcsec DEs Declination (J2000)
29- 33 F5.2 mag VmagA ACS V magnitude (1)
35- 39 F5.2 mag VmagC CTIO V magnitude (1)
41- 45 F5.2 mag U-B CTIO U-B colour index (1)
47- 51 F5.2 mag B-V CTIO B-V colour index (1)
53- 64 A12 ---- SpType MK spectral Type
66- 70 F5.2 mag Q Reddening-free parameter
72- 76 F5.2 mag (B-V)0 Deredenned B-V colour index
78- 81 F4.2 mag E(B-V) B-V colour excess
83- 86 F4.2 mag AV Absorption in V band
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Note (1): Photometry of OB stars in NGC 346 by Massey et al. (1989, Cat.
J/AJ/98/1305) and from our ACS analysis. Colors and spectral types
are also taken from Massey et al. (1989, Cat. J/AJ/98/1305).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [BSS2007] Sequential number from Bolato et al.,
2007, Cat. J/ApJ/655/212
5- 11 F7.4 deg RAdeg Right ascension in degrees (J2000)
13- 20 F8.4 deg DEdeg Declination in decimal degrees (J2000)
22- 26 F5.2 mag [3.6] ?=- IRAC 3.6um magnitude
28- 32 F5.2 mag [4.5] IRAC 4.5um magnitude
34- 38 F5.2 mag [5.8] IRAC 5.8um magnitude
40- 44 F5.2 mag [8.0] IRAC 8.0um magnitude
46- 49 F4.2 mag [24] ?=- MIPS 24um magnitude
51- 52 I2 ---- N* Numbers of stars found to coincide from our
ACS photometry (Paper I) with the loci of
these YSOs (within 1.5")
54- 58 F5.2 mag F555W F555W Vega magnitude
60- 64 F5.2 mag F814W F814W Vega magnitude
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History:
From electronic version of the journal
References:
Gouliermis et al., Paper I 2006ApJS..166..549G 2006ApJS..166..549G, Cat. J/ApJS/166/549
Rochau et al., Paper II 2007ApJ...664..322R 2007ApJ...664..322R
(End) Patricia Vannier [CDS] 07-Apr-2010