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J/ApJ/823/59       WISE and 2MASS photometry of M giant stars       (Li+, 2016)

Selecting M giants with infrared photometry: distances, metallicities, and the Sagittarius stream. Li J., Smith M.C., Zhong J., Hou J., Carlin J.L., Newberg H.J., Liu C., Chen L., Li L., Shao Z., Small E., Tian H. <Astrophys. J., 823, 59-59 (2016)> =2016ApJ...823...59L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Stars, giant ; Photometry, infrared ; Surveys Keywords: galaxies: individual: Sagittarius; Galaxy: halo; Galaxy: structure; stars: abundances; stars: distances; stars: late-type Abstract: Using a spectroscopically confirmed sample of M giants, M dwarfs, and quasars from the LAMOST survey, we assess how well Wide-field Infrared Survey Explorer (WISE) and Two Micron All Sky Survey color cuts can be used to select M giant stars. The WISE bands are very efficient at separating M giants from M dwarfs, and we present a simple classification that can produce a clean and relatively complete sample of M giants. We derive a new photometric relation to estimate the metallicity for M giants, calibrated using data from the APOGEE survey. We find a strong correlation between the (W1-W2) color and [M/H], where almost all of the scatter is due to photometric uncertainties. We show that previous photometric distance relations, which are mostly based on stellar models, may be biased and devise a new empirical distance relation, investigating trends with metallicity and star formation history. Given these relations, we investigate the properties of M giants in the Sagittarius stream. The offset in the orbital plane between the leading and trailing tails is reproduced, and by identifying distant M giants in the direction of the Galactic anticenter, we confirm that the previously detected debris in the outer halo is the apocenter of the trailing tail. We also find tentative evidence supporting an existing overdensity near the leading tail in the northern Galactic hemisphere, possibly an extension to the trailing tail (so-called Branch C). We have measured the metallicity distribution along the stream, finding a clear metallicity offset between the leading and trailing tails, in agreement with models for the stream formation. We include an online table of M giants to facilitate further studies. Description: We cross-matched our LAMOST spectroscopically confirmed sample of M giants, M dwarfs, and QSOs (see section 2) to the ALLWISE Source Catalog in the NASA/IPAC Infrared Science Archive, using a search radius of 3". We also applied some cuts detailed in section 3. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 102 188686 *Positions, magnitudes and reddening for a sample of halo M-giants
Note on table4.dat: This table must be used with caution at low latitudes, since source confusion and problems with the extinction maps (e.g., the low resolution) can affect the reliability of the sample.
See also: V/146 : LAMOST DR1 catalogs (Luo+, 2015) II/328 : AllWISE Data Release (Cutri+ 2013) II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997) J/other/RAA/15.1154 : M-giant star candidates in LAMOST DR 1 (Zhong+, 2015) J/AJ/150/42 : Catalog of 2612 M dwarfs from LAMOST (Zhong+, 2015) J/AJ/147/76 : M giant cand. photometry in the Milky Way (Bochanski+, 2014) J/AJ/145/163 : Catalog of stars in Sgr dwarf galaxy (Newby+, 2013) J/AJ/145/102 : Bright M dwarfs spectrosc. in the northern sky (Lepine+, 2013) J/ApJ/765/154 : RR Lyrae stars in the Catalina Sky Survey (Drake+, 2013) J/AJ/145/52 : Abundances of late K&M dwarfs in binary systems (Mann+, 2013) J/ApJ/753/90 : Stellar param. of K5 and later type Kepler stars (Mann+, 2012) J/ApJ/749/77 : MW halo. III. Statistical abundances (Schlaufman+, 2012) J/AJ/141/105 : NIR-matched quasar catalog (Peth+, 2011) J/ApJ/708/1290 : A 2MASS view of the Sgr dSph. VI. (Chou+, 2010) J/ApJ/670/346 : M giant stars in the Sgr dwarf galaxy. V. (Chou+, 2007) J/A+A/464/201 : RGB stars in Sagittarius streams (Monaco+, 2007) J/AJ/125/1598 : New high PM stars in the northern sky (Lepine+, 2003) J/AJ/113/806 : M-Subdwarfs (Gizis 1997) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 19 A19 --- WISEA AllWISE designation (Cutri+, 2013, II/328) 21- 31 F11.7 deg RAdeg Right Ascension, decimal degrees (J2000) 33- 43 F11.7 deg DEdeg Declination, decimal degrees (J2000) 45- 50 F6.3 mag Jmag [12/16] 2MASS J magnitude (1.25um) 52- 56 F5.3 mag e_Jmag [0.01/0.1] Uncertainty in Jmag 58- 63 F6.3 mag Ksmag [10.7/14.6] 2MASS Ks magnitude (2.17um) 65- 69 F5.3 mag e_Ksmag [0.01/0.1] Uncertainty in Ksmag 71- 76 F6.3 mag W1mag [10.5/13.8] W1 magnitude (3.35um) 78- 82 F5.3 mag e_W1mag [0.02/0.06] Uncertainty in W1mag 84- 89 F6.3 mag W2mag [10.5/13.9] W2 magnitude (4.6um) 91- 95 F5.3 mag e_W2mag [0.01/0.06] Uncertainty in W2mag 97-102 F6.4 mag E(B-V) [0.005/2.1] Reddening (1)
Note (1): E(B-V) reddening derived from the maps of Schlegel et al. (1998ApJ...500..525S).
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Aug-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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