J/MNRAS/411/1597 LMC point source classification in SAGE-Spec (Woods+, 2011)
The SAGE-Spec Spitzer Legacy programme: the life-cycle of dust and gas in the
Large Magellanic Cloud. Point source classification I.
Woods P.M., Oliveira J.M., Kemper F., van Loon J.T., Sargent B.A.,
Matsuura M., Szczerba R., Volk K., Zijlstra A.A., Sloan G.C., Lagadec E.,
McDonald I., Jones O., Gorjian V., Kraemer K.E., Gielen C., Meixner M.,
Blum R.D., Sewilo M., Riebel D., Shiao B., Chen C.-H.R., Boyer M.L.,
Indebetouw R., Antoniou V., Bernard J.-P., Cohen M., Dijkstra C.,
Galametz M., Galliano F., Gordon K.D., Harris J., Hony S., Hora J.L.,
Kawamura A., Lawton B., Leisenring J.M., Madden S., Marengo M., McGuire C.,
Mulia A.J., O'Halloran B., Olsen K., Paladini R., Paradis D., Reach W.T.,
Rubin D., Sandstrom K., Soszynski I., Speck A.K., Srinivasan S.,
Tielens A.G.G.M., van Aarle E., van Dyk S.D., Van Winckel H., Vijh U.P.,
Whitney B., Wilkins A.N.
<Mon. Not. R. Astron. Soc., 411, 1597-1627 (2011)>
=2011MNRAS.411.1597W 2011MNRAS.411.1597W
ADC_Keywords: Magellanic Clouds ; Surveys ; Cross identifications
Keywords: techniques: spectroscopic - surveys - galaxies: individual: LMC -
Magellanic Clouds - infrared: galaxies - infrared: stars
Abstract:
We present the classification of 197 point sources observed with the
Infrared Spectrograph in the SAGE-Spec Legacy programme on the Spitzer
Space Telescope. We introduce a decision-tree method of object
classification based on infrared spectral features, continuum and
spectral energy distribution shape, bolometric luminosity, cluster
membership and variability information, which is used to classify the
SAGE-Spec sample of point sources. The decision tree has a broad
application to mid-infrared spectroscopic surveys, where supporting
photometry and variability information are available. We use these
classifications to make deductions about the stellar populations of
the Large Magellanic Cloud and the success of photometric
classification methods. We find 90 asymptotic giant branch (AGB)
stars, 29 young stellar objects, 23 post-AGB objects, 19 red
supergiants, eight stellar photospheres, seven background galaxies,
seven planetary nebulae, two HII regions and 12 other objects, seven
of which remain unclassified.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 133 197 Classification of point sources targeted in IRS
staring mode as part of the SAGE-Spec program
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See also:
II/247 : Variable Stars in the Large Magellanic Clouds (MACHO, 2001)
J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006)
J/AJ/136/1242 : LMC long-period variables from MACHO (Fraser+, 2008)
J/AcA/58/293 : Type-II and anomalous Cepheids in LMC (Soszynski+, 2008)
J/AcA/59/239 : VI light curves of LMC long-period variables (Soszynski+, 2009)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SSID [1/197] Sequential number
5- 29 A25 --- Name Name (1)
31- 32 I2 h RAh Observed right ascension (J2000)
34- 35 I2 min RAm Observed right ascension (J2000)
37- 41 F5.2 s RAs Observed right ascension (J2000)
43 A1 --- DE- Observed declination sign (J2000)
44- 45 I2 deg DEd Observed declination (J2000)
47- 48 I2 arcmin DEm Observed declination (J2000)
50- 54 F5.2 arcsec DEs Observed declination (J2000)
56- 77 A22 --- SSTISAGE SSTISAGE designation (2)
79- 91 A13 --- MACHO MACHO designation (Cat. II/247)
93- 96 I4 d Per ? MACHO period or
lower value of period interval (3)
97 A1 --- --- [-]
98-101 I4 d Per2 ? Upper value of MACHO period interval (3)
102 A1 --- u_Per [u] for period undefined in MACHO
104-113 A10 --- OGLE OLGE designation
115-117 I3 d PerO ? OGLE period (4)
119-133 A15 --- Class Classification of the object (5)
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Note (1): We employ commonly-used abbreviations, e.g.,
* RP for [RP2006] (Reid & Parker, 2006, Cat. J/MNRAS/373/521),
* KDM for [KDM2001] (Kontizas et al., 2001, cat. J/A+A/369/932)
Note (2): SAGE-LMC identifier (Meixner et al., 2006, Cat. J/AJ/132/2268)
Note (3): Periods are taken from Alcock et al. (1998AJ....115.1921A 1998AJ....115.1921A) and
Fraser et al. (2005AJ....129..768F 2005AJ....129..768F, 2008, Cat. J/AJ/136/1242).
Note (4): Periods are taken from the online OGLE-III catalog, as of 2009
October 21 (Soszy'nski et al. 2008, Cat. J/AcA/58/293;
2009, Cat. J/AcA/59/239)
Note (5): the classes are defined as follows:
YSO-1 = Young stellar object with ices
YSO-2 = Young stellar object with silicate absorption
YSO-3 = Young stellar object with PAH emission
YSO-4 = Young stellar object with silicate emission
STAR = Stellar photosphere
C-AGB = C-rich AGB star
O-AGB = O-rich AGB star
RSG = Red supergiant
C-PAGB = C-rich post-AGB star
O-PAGB = O-rich post-AGB star
C-PN = C-rich planetary nebula
O-PN = O-rich planetary nebula
HII = HII region
GAL = Galaxy
OTHER = Object of known type
UNK = Object of unknown type
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Sep-2011