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J/ApJ/723/1195         SAGE AGB candidates                      (Riebel+, 2010)

Infrared period-luminosity relations of evolved variable stars in the Large Magellanic Cloud. Riebel D., Meixner M., Fraser O., Srinivasan S., Cook K., Vijh U. <Astrophys. J., 723, 1195-1209 (2010)> =2010ApJ...723.1195R
ADC_Keywords: Cross identifications ; Magellanic Clouds ; Photometry, infrared ; Stars, giant ; Stars, carbon ; Stars, variable Keywords: infrared: stars - Magellanic Clouds - stars: AGB and post-AGB - stars: carbon - stars: variables: general Abstract: We combine variability information from the MAssive Compact Halo Objects survey of the Large Magellanic Cloud with infrared photometry from the Spitzer Space Telescope Surveying the Agents of a Galaxy's Evolution survey to create a data set of ∼30000 variable red sources. We photometrically classify these sources as being on the first ascent of the red giant branch, or as being in one of three stages along the asymptotic giant branch (AGB): oxygen-rich, carbon-rich, or highly reddened with indeterminate chemistry ("extreme" AGB candidates). We present linear period-luminosity (P-L) relationships for these sources using eight separate infrared bands (J, H, Ks, 3.6, 4.5, 5.8, 8.0, and 24um) as proxies for the luminosity. We find that the wavelength dependence of the slope of the P-L relationship is different for different photometrically determined classes of AGB stars. Stars photometrically classified as O-rich show the least variation of slope with wavelength, while dust enshrouded extreme AGB stars show a pronounced trend toward steeper slopes with increasing wavelength. We find that O-rich AGB stars pulsating in the fundamental mode obey a period-magnitude relation with a slope of -3.41±0.04 when magnitude is measured in the 3.6um band, in contrast to C-rich AGB stars, which obey a relation of slope -3.77±0.05. Description: We extract a list of 32744 sources from Fraser et al.'s (2008, Cat. J/AJ/136/1242) catalog of evolved long-period variables (LPVs) in the LMC with a counterpart in the SAGE mosaic photometry archive. We use a matching radius of 2", and keep only the closest SAGE source to a given MACHO source. We are left with a final data set of 30747 evolved stars with well-defined MACHO periods and high quality near IR photometry from Two Micron All Sky Survey (2MASS) and SAGE. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 165 30747 Source list of AGB candidates
See also: II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009) II/247 : Variable Stars in the Large Magellanic Clouds (MACHO, 2001) J/A+A/537/A105 : Modelisation of AGB stars in the LMC (Gullieuszik+, 2012) J/A+A/530/A90 : Post-AGB population of LMC (van Aarle+, 2011) J/MNRAS/411/1597 : LMC point source classification in SAGE-Spec (Woods+, 2011) J/A+A/506/1277 : Magellanic Cloud C/O stars (Groenewegen+, 2009) J/AJ/137/4810 : LMC-SAGE AGB star candidates (Srinivasan+, 2009) J/AJ/137/3139 : LMC SAGE. New variable evolved stars and YSOs (Vijh+, 2009) J/AJ/138/1003 : IR photometry of massive LMC stars (Bonanos+, 2009) J/AJ/136/1242 : LMC long-period variables from MACHO (Fraser+, 2008) J/A+A/480/379 : Abundances of 59 red giants in LMC (Pompeia+, 2008) J/AJ/122/1844 : MSX and 2MASS cross-correlation in LMC (Egan+, 2001) J/AJ/99/784 : IR photometry of LMC long-period variables (Hughes+ 1990) J/ApJ/348/98 : LMC AGB stars IRAS fluxes (Reid+ 1990) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- --- [SSTISAGEMA] 12- 30 A19 --- SSTISAGEMA SAGE IRAC designation ( 32- 43 A12 --- MACHO MACHO (field.tile.sequence) identifier 45- 52 I8 --- 2MASS ? 2MASS identifier 54 A1 --- Cl [CORX] Photometric classification (C-rich, O-rich, RGB or eXtreme AGB) (1) 56- 60 F5.3 mag Amp Variability amplitude from MACHO lightcurve 62- 69 F8.3 d VPer Variability period derived from MACHO lightcurve 71- 75 F5.2 mag Jmag ?=99 2MASS J band magnitude 77- 81 F5.2 mag e_Jmag ?=99 The 1σ error in Jmag 83- 87 F5.2 mag Hmag ?=99 2MASS H band magnitude 89- 93 F5.2 mag e_Hmag ?=99 The 1σ error in Hmag 95- 99 F5.2 mag Ksmag ?=99 2MASS Ks band magnitude 101-105 F5.2 mag e_Ksmag ?=99 The 1σ error in Ksmag 107-111 F5.2 mag [3.6] ?=99 Spitzer/IRAC 3.6 micron band magnitude 113-117 F5.2 mag e_[3.6] ?=99 The 1σ error in [3.6] 119-123 F5.2 mag [4.5] ?=99 Spitzer/IRAC 4.5 micron band magnitude 125-129 F5.2 mag e_[4.5] ?=99 The 1σ error in [4.5] 131-135 F5.2 mag [5.8] ?=99 Spitzer/IRAC 5.8 micron band magnitude 137-141 F5.2 mag e_[5.8] ?=99 The 1σ error in [5.8] 143-147 F5.2 mag [8.0] ?=99 Spitzer/IRAC 8.0 micron band magnitude 149-153 F5.2 mag e_[8.0] ?=99 The 1σ error in [8.0] 155-159 F5.2 mag [24] ?=99 Spitzer/MIPS 24 micron band magnitude 161-165 F5.2 mag e_[24] ?=99 The 1σ error in [24]
Note (1): Extreme AGB stars are defined using their position in the [3.6] versus J-[3.6] CMD: J-[3.6]>3.1 and [3.6]<10.5 or the IRAC [8.0] versus [8.0]-[3.6] CMD if a source lacks a valid J-band magnitude. These sources are thought to be highly evolved AGB stars, enshrouded by thick circumstellar dust shells with high rates of mass loss. See section 2.2 for further classification details.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Jul-2012
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