J/A+A/564/A31 SMC blob N26 multiband photometry (Testor+, 2014)
Optical and infrared observations of the young SMC blob N26 and its environment.
Testor G., Heydari-Malayeri M., Chen C.-H.R., Lemaire J.L., Sewilo M.,
Diana S.
<Astron. Astrophys. 564, A31 (2014)>
=2014A&A...564A..31T 2014A&A...564A..31T
ADC_Keywords: Magellanic Clouds ; H II regions ; Photometry, infrared ;
Photometry, UBV
Keywords: Magellanic Clouds - ISM: individual objects: N26 - HII regions -
dust, extinction - stars: formation - stars: massive
Abstract:
High-excitation compact HII regions of the Magellanic Clouds are
sites of recent massive star formation in low metallicity
environments.
Detailed study of these regions and their environments using
high-spatial resolution observations is necessary to better understand
massive star formation, which is still an unsolved problem. We aim at
a detailed study of the Small Magellanic Cloud compact HII region
N26, which is only ∼4" in diameter.
This study is based on high spatial resolution imaging (∼0.1"-0.3")
in JHKs and L' bands, using the VLT equipped with the NAOS adaptive
optics system. A larger region (∼50pcx76pc) was also imaged at medium
spatial resolution, using the ESO 2.2m telescope in optical
wavelengths. We also used the JHKs archival data from the IRSF survey
and the Spitzer Space Telescope SAGE-SMC survey.
Description:
Near-IR observations of a small area centered on the SMC compact
HII region N26 were obtained at the ESO VLT on October 9 and 10,
2004. Images and spectra were taken using NACO on UT4, composed of the
Nasmyth Adaptive Optics System (NAOS) and the High Resolution IR
Camera and Spectrometer (CONICA). The detector was a 1026x1024 SBRC
InSb Aladdin 3 array. The cameras S54 (Fig. 2a) and S27 (Fig. 2b) were
used in the range 1.0-2.5um and the L27 camera in the range
2.5-5.0um.
We used B and V broad bands as well as narrow emission line bands
(Hβ, [OIII] λ5007) to observe the regions N21, N22, N23,
N25, and N26. The observations were made in October 1987 using the
2.2m telescope at La Silla. The detector was a 1000x1000 CCD
(GEC) with a pixel size of 0.26" on the sky. The seeing was ∼1.5"
and exposure times ranged from 90s to 900s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 194 267 B, V, and infrared photometry of sources in SMCB2
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See also:
II/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)
II/288 : IRSF Magellanic Clouds Point Source Catalog (Kato+ 2007)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
4- 5 A2 --- n_Seq [mnp ph] Notes (1)
6- 11 I6 --- [M2002] ? Massey (Cat. II/236) catalog number,
<[M2002] SMC NNNNNN> in Simbad
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 36 F5.2 arcsec DEs Declination (J2000)
39- 43 F5.2 mag Bmag ? B magnitude
45- 48 F4.2 mag e_Bmag ? rms uncertainty on Bmag (2)
51- 55 F5.2 mag Vmag ? V magnitude
57- 60 F4.2 mag e_Vmag ? rms uncertainty on Vmag (2)
63- 67 F5.2 mag Jmag ? VLT/CONICA J magnitude
69- 72 F4.2 mag e_Jmag ? rms uncertainty on Jmag (2)
74- 78 F5.2 mag Hmag ? VLT/CONICA H magnitude
80- 83 F4.2 mag e_Hmag ? rms uncertainty on Hmag (2)
87- 91 F5.2 mag Kmag ? VLT/CONICA Ks magnitude
93- 96 F4.2 mag e_Kmag ? rms uncertainty on Kmag (2)
100-104 F5.2 mag [3.6] ? SAGE-SMC 3.6um magnitude
106-109 F4.2 mag e_[3.6] ? rms uncertainty on [3.6] (2)
111-115 F5.2 mag [4.5] ? SAGE-SMC 4.5um magnitude
117-120 F4.2 mag e_[4.5] ? rms uncertainty on [4.5] (2)
123-127 F5.2 mag [5.8] ? SAGE-SMC 5.8um magnitude
129-133 F5.3 mag e_[5.8] ? rms uncertainty on [5.8] (2)
136-140 F5.2 mag [8.0] ? SAGE-SMC 8.0um magnitude
142-145 F4.2 mag e_[8.0] ? rms uncertainty on [8.0] (2)
148-151 F4.2 mag [24] ? SAGE-SMC 24um magnitude
152 A1 --- n_[24] [d] not resolved at 24 and 70um (1)
155-158 F4.2 mag e_[24] ? rms uncertainty on [24] (2)
162-166 F5.2 mag [70] ? SAGE-SMC 70um magnitude
168-171 F4.2 mag e_[70] ? rms uncertainty on [70] (2)
173-177 F5.2 mag [160] ? SAGE-SMC 160um magnitude
179-182 F4.2 mag e_[160] ? rms uncertainty on [160] (2)
184-186 A3 --- Type YSO type (I-III)
188-193 A6 --- Rem Remarks (location nebula)
194 A1 --- n_Rem Notes (1)
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Note (1): Notes as follows:
m = The integrated magnitudes of 169 or N26 are adopted from
Massey (2002ApJS..141...81M 2002ApJS..141...81M, Cat. II/236) for BV and 2MASS for JHKs.
n = JHKL' magnitudes obtained using NACO data.
p = As the photometry in the SAGE catalog is not complete, the magnitudes of
IRAC and the 24um bands were derived from the images using Daophot.
ph = In this catalog the photometry of this star is not complete either. As
its FWHM is larger than the PSF (∼4"), the magnitudes were derived from
a sum of profiles crossing the whole star and a neighboring isolated
star used as standard.
d = Stars 19 and 29 are not resolved in the 24um and 70um bands. We assume
their intensity emission to be half of the integrated intensity.
t = Labeled in Testor (2001A&A...372..667T 2001A&A...372..667T).
c = Component of N26 (LHA 115-N 26 on Simbad).
Note (2): For JHKs uncertainties see Sect. 2.1.1; for BV see Sect. 2.1.2;
for IRAC and MIPS see Gordon et al. (2011AJ....142..102G 2011AJ....142..102G);
for CONICA see Kato et al. (2007PASJ...59..615K 2007PASJ...59..615K, Cat. II/288).
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Acknowledgements:
Gerard Testor, gerard.testor(at)obspm.fr
(End) Patricia Vannier [CDS] 07-Apr-2014