J/AJ/136/1221 Most luminous LMC sources at 8µm (Kastner+, 2008)
The Large Magellanic Cloud's top 250: classification of the most luminous
compact 8µm sources in the Large Magellanic Cloud.
Kastner J.H., Thorndike S.L., Romanczyk P.A., Buchanan C.L., Hrivnak B.J.,
Sahai R., Egan M.
<Astron. J., 136, 1221-1241 (2008)>
=2008AJ....136.1221K 2008AJ....136.1221K
ADC_Keywords: Magellanic Clouds ; Infrared sources ; Millimetric/submm sources
Keywords: circumstellar matter - infrared: stars - Magellanic Clouds -
stars: AGB and post-AGB - stars: mass loss
Abstract:
To ascertain the nature of the brightest compact mid-infrared (mid-IR)
sources in the Large Magellanic Cloud (LMC), we have applied an
updated version of Buchanan et al.'s (2006AJ....132.1890B 2006AJ....132.1890B) Two Micron
All Sky Survey (2MASS)-Midcourse Space Experiment (MSX) color
classification system, which is based on the results of Spitzer Space
Telescope spectroscopy, to a mid-IR (8um) flux-limited sample of 250
LMC objects for which 2MASS and MSX photometry is available. The
resulting 2MASS-MSX ("JHK8") color-based classifications of these
sources, which constitute the most mid-IR-luminous objects in the LMC,
were augmented, cross-checked, and corrected where necessary via a
variety of independent means, such that only 46 sources retain
tentative classifications and only 10 sources cannot be classified at
all. The sample is found to consist primarily of carbon-rich
asymptotic giant branch (AGB) stars (35%), red supergiants (RSGs)
(18%), and compact HII regions (32%), with additional, small
populations of oxygen-rich AGB stars (∼5%), dusty, early-type
emission-line stars (∼3%), and foreground, O-rich AGB stars in the
Milky Way (∼3%).
Description:
We began with all 1664 objects from the sample compiled by Egan et al.
(2000, Cat. J/AJ/122/1844, hereafter EVP01) that were identified in
both the MSX and the 2MASS surveys. In order to study the same
population sampled for the Paper I (Buchanan et al.,
2006AJ....132.1890B 2006AJ....132.1890B) Spitzer/IRS spectral study, we applied the same
8.3umag limit, A≤6.5 or F8.3≥150mJy (based on the MSX photometric
calibration cited in EVP01).
The final sample considered here then consists of 250 objects.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 119 250 Objects in the A-band flux-limited 2MASS/MSX sample
table4.dat 60 166 SAGE IRAC/MIPS counterparts to luminous LMC 8um
MSX Sources
refs.dat 89 15 References
--------------------------------------------------------------------------------
See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)
J/AJ/122/1844 : MSX and 2MASS cross-correlation in LMC (Egan+, 2001)
J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq The MSX LMC identification number,
in Simbad
6- 28 A23 --- Name Simbad identification
30- 40 A11 --- Type Simbad type (1)
42- 46 F5.2 mag Jmag 2MASS J band magnitude
47 A1 --- f_Jmag [u] Indicates upper limit on Jmag
49- 53 F5.2 mag Hmag 2MASS H band magnitude
54 A1 --- f_Hmag [u] Indicates upper limit on Hmag
56- 60 F5.2 mag Ksmag 2MASS Ks band magnitude
61 A1 --- f_Ksmag [u] Indicates upper limit on Ksmag
63- 66 F4.2 mag Amag MSX A band magnitude
68- 72 A5 --- Ecl Egan, Van Dyk & Price 2001 (Cat.
J/AJ/122/1844) classification
74- 81 A8 --- Bcl Buchanan et al 2006 (2006AJ....132.1890B 2006AJ....132.1890B)
Paper I classification
83- 91 A9 --- JHK8cl JHK8 color-based classification (2)
93 A1 --- f_JHK8cl [f] Source appears in expanded HII
classification box
95-102 A8 --- Class Most probable classification (3)
104 A1 --- f_Class [ig] Note on criteria for class (4)
106-110 E5.2 Lsun LIR ? The IR luminosity
111 A1 --- u_LIR Uncertainty flag on LIR
112 A1 --- f_LIR [eh] explanation on LIR uncertainty (5)
114-119 A6 --- Ref Reference(s), in refs.dat file
--------------------------------------------------------------------------------
Note (1): Object types (other than stellar spectral types) are as follows:
V* = variable star
EmO = emission-line source
IR = infrared source
* = star
sr* = semi-regular variable star
Mi* = variable star of Mira type
OpC = open cluster
As* = association of stars,
Cl* = cluster of stars
*iC = star in cluster
*i* = star in double system
MoC = molecular cloud
Rad = radio source
*iA = star in association
HV* = high-velocity star
Note (2): See Sections 3.1 and 3.2. Colons indicate tentative
classifications; blank entries indicate sources that are not
classifiable via JHK8 colors.
Note (3): Most probable classifications for sources, based on JHK8
color-based classification system, available literature, and
additional cross-checks (see Section 3.2). Question marks indicate
tentative classifications; blank entries indicate sources that have
no classifications.
Note (4): Flag on Class as follows:
g = K magnitude was used to determine classification as "RSG" (red
supergiant) or "GMV" (Galactic Mira variable; see Section 3.2.1)
i = Archival Spitzer IRS spectrum available (see Section 3.2.1)
Note (5): Flag on LIR as follows:
e = LIR determined in Paper I (2006AJ....132.1890B 2006AJ....132.1890B)
h = LIR uncertain because K magnitude is an upper limit
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq The MSX LMC identification number,
in Simbad
6- 12 A7 --- Class Classification (1)
14- 32 A19 --- SAGE The SAGE identification number
34- 38 F5.2 mag 3.6mag ? IRAC 3.6 micron band magnitude
40- 44 F5.2 mag 4.5mag ? IRAC 4.5 micron band magnitude
46- 50 F5.2 mag 5.8mag IRAC 5.8 micron band magnitude
52- 55 F4.2 mag 8.0mag ? IRAC 8.0 micron band magnitude
57- 60 F4.2 mag 24mag MIPS 24 micron band magnitude
--------------------------------------------------------------------------------
Note (1): Most probable classifications for sources, based on JHK8
color-based classification system, available literature, and
additional cross-checks (see Section 3.2). Question marks indicate
tentative classifications.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 40 A17 --- Aut Authors' name
44- 89 A46 --- Com Comments
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Buchanan et al., Paper I 2006AJ....132.1890B 2006AJ....132.1890B
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Apr-2011