J/ApJ/669/327 S3MC: YSOs in N66, in SMC (Simon+, 2007)
The Spitzer survey of the Small Magellanic Cloud: discovery of embedded
protostars in the HII region NGC 346.
Simon J.D., Bolatto A.D., Whitney B.A., Robitaille T.P., Shah R.Y.,
Makovoz D., Stanimirovic S., Barba R.H., Rubio M.
<Astrophys. J., 669, 327-336 (2007)>
=2007ApJ...669..327S 2007ApJ...669..327S
ADC_Keywords: Magellanic Clouds ; H II regions ; YSOs
Keywords: H II regions - infrared: stars - ISM: individual (N66) -
Magellanic Clouds - stars: formation - stars: pre-main sequence
Abstract:
We use Spitzer Space Telescope observations from the Spitzer Survey of
the Small Magellanic Cloud (S3MC) to study the young stellar content
of N66, the largest and brightest HII region in the SMC. In addition
to large numbers of normal stars, we detect a significant population
of bright, red infrared sources that we identify as likely to be young
stellar objects (YSOs). We use spectral energy distribution (SED) fits
to classify objects as ordinary (main-sequence or red giant) stars,
asymptotic giant branch stars, background galaxies, and YSOs.
Description:
We performed photometry on the mosaic images with the Astronomical
Point Source Extraction (APEX) tasks in the MOPEX package.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 94 111 Young Stellar Objects in N66
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See also:
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 A1 --- YSO [DP] (D)efinite or (P)robable YSOs
3- 5 I3 --- [SBW2007b] Sequential number
7- 13 A7 --- --- [SSTS3MC]
15- 29 A15 --- SSTS3MC SSTS3MC designation (DD.dddd+DD.dddd)
31- 32 I2 h RAh Right ascension (J2000)
34- 35 I2 min RAm Right ascension (J2000)
37- 41 F5.2 s RAs Right ascension (J2000)
43 A1 --- DE- Declination sign (J2000)
44- 45 I2 deg DEd Declination (J2000)
47- 48 I2 arcmin DEm Declination (J2000)
50- 53 F4.1 arcsec DEs Declination (J2000)
55- 59 I5 solLum Lum Stellar luminosity
61- 65 I5 solLum e_Lum ?=- rms uncertainty on Lum (1)
67- 70 F4.1 solMass Mass Stellar mass
72- 74 F3.1 solMass e_Mass ?=- rms uncertainty on Mass (1)
76- 78 A3 --- Stage Stage of YSO (I, II or III)
80- 82 F3.1 --- e_Stage ?=- rms uncertainty on Stage (1)
84- 88 F5.2 --- chi2 χ2 value (2)
90- 94 F5.2 --- chi22 ?=- χ22 value (3)
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Note (1): The uncertainties on the luminosities, masses, and stages are
calculated as the weighted standard deviation of the luminosities,
masses, and stages of all of the acceptable YSO models. In cases where
there is only one acceptable model for a given source, or there are
multiple models but they all produce the same luminosity/mass/stage,
we cannot calculate an uncertainty in this way, so we fill the
corresponding space with an ellipsis.
Note (2): The χ2 value for the best-fitting SED. Note that these are
raw χ2 values, not χ2 per data point, so a good fit
(χ2 per data point ≤2.2) can have a χ2 value as high as 8.8
(if there are four flux data points for that source) or more.
Note (3): The χ2 value for the best-fitting AGB star or background
galaxy SED.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Jan-2010