J/AJ/143/128 High-metallicity M giant candidates from SDSS (Palladino+, 2012)
Identifying high-metallicity M giants at intragroup distances with Sloan Digital
Sky Survey.
Palladino L.E., Holley-Bockelmann K., Morrison H., Durrell P.R.,
Ciardullo R., Feldmeier J., Wade R.A., Kirkpatrick J.D., Lowrance P.
<Astron. J., 143, 128 (2012)>
=2012AJ....143..128P 2012AJ....143..128P
ADC_Keywords: Photometry, SDSS ; Stars, M-type ; Stars, giant
Keywords: Galaxy: halo - Galaxy: stellar content - Local Group -
stars: late-type
Abstract:
Tidal stripping and three-body interactions with the central
supermassive black hole may eject stars from the Milky Way. These
stars would comprise a set of "intragroup" stars (IGS) that trace the
past history of interactions in our galactic neighborhood. Using the
Sloan Digital Sky Survey (SDSS) DR7 (Cat. II/294, superseded by Cat.
V/139), we identify candidate solar-metallicity red giant intragroup
stars using color cuts that are designed to exclude nearby M and L
dwarfs. We present 677 intragroup candidates that are selected between
300kpc and 2Mpc, and are either the reddest intragroup candidates
(M7-M10) or are L dwarfs at larger distances than previously detected.
Description:
Using our color selection criteria, we found 159108
extinction-corrected objects in SDSS DR7 (Cat. II/294, superseded by
Cat. V/139). After applying the distance cut and checking the data
flags, we narrowed the sample to 4181 objects. We then
cross-correlated our sample with the 2MASS (Cat. II/246) and USNO-B
(Cat. I/284) surveys, removing any stars with dwarf-like J-H colors
and any stars with non-zero proper motions.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 89 677 Intragroup star candidates remaining after all
criteria cut
--------------------------------------------------------------------------------
See also:
II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
J/AJ/139/1808 : Colors and kinematics of SDSS L dwarfs (Schmidt+, 2010)
J/AJ/141/97 : SDSS DR7 M dwarfs (West+, 2011)
J/ApJ/710/1142 : SpeX spectroscopy of low mass binaries. I. (Burgasser+, 2010)
J/ApJ/676/1281 : L and T dwarfs in 2MASS/SDSS (Metchev+, 2008)
J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006)
J/ApJ/670/346 : M giant stars in the Sagittar. dwarf galaxy. V. (Chou+, 2007)
J/AJ/134/2398 : Stellar SEDs in SDSS and 2MASS filters (Covey+, 2007)
J/PASP/118/659 : RI photometry of 2MASS late M and L dwarfs (Liebert+, 2006)
J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002)
J/ApJ/476/311 : 2MASS M-dwarf discoveries (Kirkpatrick+ 1997)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 I18 --- ObjId SDSS-DR7 object identification
20- 27 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
29- 36 F8.4 deg DEdeg Declination in decimal degrees (J2000)
38- 41 F4.1 mag umag [22.3/26.8] SDSS-DR7 u band magnitude
43- 45 F3.1 mag e_umag Uncertainty in umag
47- 50 F4.1 mag gmag [23.5/27.4] SDSS-DR7 g band magnitude
52- 54 F3.1 mag e_gmag Uncertainty in gmag
56- 59 F4.1 mag rmag [23.2/25.8] SDSS-DR7 r band magnitude
61- 63 F3.1 mag e_rmag Uncertainty in rmag
65- 68 F4.1 mag imag [20.8/23.2] SDSS-DR7 i band magnitude
70- 72 F3.1 mag e_imag Uncertainty in imag
74- 77 F4.1 mag zmag [19/21.7] SDSS-DR7 z band magnitude
79- 81 F3.1 mag e_zmag Uncertainty in zmag
83- 85 F3.1 mag r-i [2.1/3.4] SDSS-DR7 (r-i) color index
87- 89 F3.1 mag i-z [1.3/2.2] SDSS-DR7 (i-z) color index
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 28-Jun-2013