J/AJ/137/4810 LMC-SAGE AGB star candidates (Srinivasan+, 2009)
The mass loss return from evolved stars to the Large Magellanic Cloud:
empirical relations for excess emission at 8 and 24 µm.
Srinivasan S., Meixner M., Leitherer C., Vijh U., Volk K., Blum R.D.,
Babler B.L., Block M., Bracker S., Cohen M., Engelbracht C.W., For B.-Q.,
Gordon K.D., Harris J., Hora J.L., Indebetouw R., Markwick-Kemper F.,
Meade M., Misselt K.A., Sewilo M., Whitney B.
<Astron. J., 137, 4810-4823 (2009)>
=2009AJ....137.4810S 2009AJ....137.4810S
ADC_Keywords: Magellanic Clouds ; Infrared sources ; Stars, giant ;
Photometry, UBVRI ; Photometry, infrared
Keywords: infrared: stars - Magellanic Clouds - stars: AGB and post-AGB -
stars: carbon - stars: mass loss
Abstract:
We present empirical relations describing excess emission from evolved
stars in the Large Magellanic Cloud (LMC) using data from the Spitzer
Space Telescope Surveying the Agents of a Galaxy's Evolution (SAGE)
survey which includes the Infrared Array Camera (IRAC) 3.6, 4.5, 5.8,
and 8.0um and Multiband Imaging Photometer (MIPS) 24, 70, and 160um
bands. We combine the SAGE data with the Two Micron All Sky Survey
(2MASS; J, H, and Ks) and the optical Magellanic Cloud Photometric
Survey (MCPS; U, B, V, and I) point source catalogs in order to create
complete spectral energy distributions (SEDs) of the asymptotic giant
branch (AGB) star candidates in the LMC. AGB star outflows are among
the main producers of dust in a galaxy, and this mass loss results in
an excess in the fluxes observed in the 8 and 24um bands. The aim of
this work is to investigate the mass loss return by AGB stars to the
interstellar medium of the LMC by studying the dependence of the
infrared excess flux on the total luminosity.
Description:
The SAGE catalog and archive point-source lists from both epochs of
observations have been delivered to the Spitzer Science Center (SSC),
and are available for download at the SSC.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 182 43066 Source list of color-selected AGB star candidates
table2.dat 123 18428 Mid-infrared excess fluxes
table3.dat 77 9616 Color temperatures and optical depths
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See also:
J/AJ/135/726 : Spitzer SAGE observations of LMC PNe (Hora+, 2008)
J/AJ/136/18 : LMC SAGE. New candidate YSOs (Whitney+, 2008)
J/AJ/137/3139 : LMC SAGE. New variable evolved stars and YSOs (Vijh+, 2009)
J/MNRAS/411/1597 : LMC point source classification in SAGE-Spec (Woods+, 2011)
J/PASP/122/683 : SAGE-Spec Spitzer legacy program (Kemper+, 2010)
http://ssc.spitzer.caltech.edu/legacy/sagehistory.html : SAGE HomePage
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- --- [SSTISAGE1A]
12- 30 A19 --- SSTISAGE1A SAGE Epoch 1 Archive designation (G1)
32- 38 A7 --- Type AGB type (G2)
40- 44 F5.2 mag Umag ?=99.99 The Johnson U band magnitude (3)
46- 50 F5.2 mag e_Umag ?=99.99 The 1σ error in Umag (3)
52- 56 F5.2 mag Bmag ?=99.99 The Johnson B band magnitude (3)
58- 62 F5.2 mag e_Bmag ?=99.99 The 1σ error in Bmag (3)
64- 68 F5.2 mag Vmag ?=99.99 The Johnson V band magnitude (3)
70- 74 F5.2 mag e_Vmag ?=99.99 The 1σ error in Vmag (3)
76- 80 F5.2 mag Icmag ?=99.99 The Cousins I band magnitude (3)
82- 86 F5.2 mag e_Icmag ?=99.99 The 1σ error in Imag (3)
88- 92 F5.2 mag Jmag ?=99.99 2MASS J band magnitude (3)
94- 98 F5.2 mag e_Jmag ?=99.99 The 1σ error in Jmag (3)
100-104 F5.2 mag Hmag ?=99.99 2MASS H band magnitude (3)
106-110 F5.2 mag e_Hmag ?=99.99 The 1σ error in Hmag (3)
112-116 F5.2 mag Kmag ?=99.99 2MASS Ks band magnitude (3)
118-122 F5.2 mag e_Kmag ?=99.99 The 1σ error in Kmag (3)
124-128 F5.2 mag 3.6mag ?=99.99 Spitzer/IRAC 3.6 micron band (3)
130-134 F5.2 mag e_3.6mag ?=99.99 The 1σ error in 3.6mag (3)
136-140 F5.2 mag 4.5mag ?=99.99 Spitzer/IRAC 4.5 micron band (3)
142-146 F5.2 mag e_4.5mag ?=99.99 The 1σ error in 4.5mag (3)
148-152 F5.2 mag 5.8mag ?=99.99 Spitzer/IRAC 5.8 micron band (3)
154-158 F5.2 mag e_5.8mag ?=99.99 The 1σ error in 5.8mag (3)
160-164 F5.2 mag 8.0mag ?=99.99 Spitzer/IRAC 8.0 micron band (3)
166-170 F5.2 mag e_8.0mag ?=99.99 The 1σ error in 8.0mag (3)
172-176 F5.2 mag 24mag ?=99.99 Spitzer/MIPS 24 micron band (3)
178-182 F5.2 mag e_24mag ?=99.99 The 1σ error in 24mag (3)
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Note (3): A value of 99.99 in any band represents either a saturation
or a non-detection.
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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- 10 A10 --- --- [SSTISAGE1A]
12- 30 A19 --- SSTISAGE1A SAGE Epoch 1 Archive designation (G1)
32- 38 A7 --- Type AGB type (G2)
40- 47 F8.3 mJy S3.6 ?=-99.999 Spitzer/IRAC 3.6 micron band excess
flux density (3)
49- 55 F7.3 mJy e_S3.6 ?=-99.999 The 1σ error in X3.6 (3)
57- 64 F8.3 mJy S4.5 ?=-99.999 Spitzer/IRAC 4.5 micron band excess
flux density (3)
66- 72 F7.3 mJy e_S4.5 ?=-99.999 The 1σ error in X4.5 (3)
74- 81 F8.3 mJy S5.8 ?=-99.999 Spitzer/IRAC 5.8 micron band excess
flux density (3)
83- 89 F7.3 mJy e_S5.8 ?=-99.999 The 1σ error in X5.8 (3)
91- 98 F8.3 mJy S8.0 Spitzer/IRAC 8.0 micron band excess
flux density (3)
100-106 F7.3 mJy e_S8.0 The 1σ error in X8.0 (3)
108-115 F8.3 mJy S24 ?=-99.999 Spitzer/MIPS 24 micron band excess
flux density (3)
117-123 F7.3 mJy e_S24 ?=-99.999 The 1σ error in X24 (3)
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Note (3):
* A value of -99.99 in any band represents either a saturation or a
non-detection.
* The errors in the excess fluxes have been calculated by propagating
the photometric errors:
δXν/Xν = sqrt[(δFν/Fν)2 +
(Fmodν/FmodH)2*(δFH/FH)2]
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- --- [SSTISAGE1A]
12- 30 A19 --- SSTISAGE1A SAGE Epoch 1 Archive designation (G1)
32- 38 A7 --- Type AGB type (G2)
40- 46 F7.2 K T Color temperature (3)
48- 53 F6.2 K e_T The 1σ error in T (3)
55- 59 F5.3 --- tau8 Optical depth at 8.0 microns (4)
61- 65 F5.3 --- e_tau8 The 1σ error in tau8 (4)
67- 71 F5.3 --- tau24 Optical depth at 24 microns (4)
73- 77 F5.3 --- e_tau24 The 1σ error in tau24 (4)
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Note (3): Derived from the 8 micron and 24 micron excesses. The
uncertainties are calculated by propagating the photometric errors.
Note (4): Derived from the color temperature. The uncertainties are
calculated by propagating the photometric errors.
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Global notes:
Note (G1): Including position coordinates of IRAC source, JHHMMSS.ss+DDMMSS.s.
Note (G2): Sources are classified as:
O-rich = O-rich based on their J-Ks colors
C-rich = C-rich based on their J-Ks colors
Extreme = Extreme based on their 2MASS and IRAC colors.
For more details, see Section 2.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-Nov-2011