J/AJ/141/97 SDSS DR7 M dwarfs (West+, 2011)
The Sloan Digital Sky Survey Data Release 7 spectroscopic M dwarf catalog.
I. Data.
West A.A., Morgan D.P., Bochanski J.J., Andersen J.M., Bell K.J.,
Kowalski A.F., Davenport J.R.A., Hawley S.L., Schmidt S.J., Bernat D.,
Hilton E.J., Muirhead P., Covey K.R., Rojas-Ayala B., Schlawin E.,
Gooding M., Schluns K., Dhital S., Pineda J.S., Jones D.O.
<Astron. J., 141, 97 (2011)>
=2011AJ....141...97W 2011AJ....141...97W
ADC_Keywords: Surveys ; Stars, dwarfs ; Stars, M-type ; Spectroscopy ;
Radial velocities ; Space velocities
Keywords: brown dwarfs - Galaxy: kinematics and dynamics - stars: abundances -
stars: activity - stars: late-type - stars: low-mass
Abstract:
We present a spectroscopic catalog of 70,841 visually inspected M
dwarfs from the seventh data release of the Sloan Digital Sky Survey.
For each spectrum, we provide measurements of the spectral type, a
number of molecular band heads, and the Hα, Hβ, Hγ,
Hδ, and CaII-K emission lines. In addition, we calculate the
metallicity-sensitive parameter ζ and identify a relationship
between ζ and the g-r and r-z colors of M dwarfs. We assess
the precision of our spectral types (which were assigned by individual
examination), review the bulk attributes of the sample, and examine
the magnetic activity properties of M dwarfs, in particular those
traced by the higher order Balmer transitions. Our catalog is
cross-matched to 2MASS infrared data, and contains photometric
distances for each star. Finally, we identify eight new late-type M
dwarfs that are possibly within 25 pc of the Sun. Future studies will
use these data to thoroughly examine magnetic activity and kinematics
in late-type M dwarfs and examine the chemical and dynamical history
of the local Milky Way.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 1000 70840 The catalog of spectroscopic M dwarfs
catalog.fits 2880 13243 The catalog as a FITS file
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
http://www.sdss.org/ : SDSS Home Page
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Plate SDSS plate number
6- 10 I5 --- MJD Modified Julian Date of last SDSS spectrum
12- 15 I4 --- Fiber SDSS fiberID
17- 18 A2 --- --- [id]
20- 38 I19 --- ObjID SDSS DR7 Object ID (II/294)
40- 48 F9.5 deg RAdeg J2000 Right Ascension of SDSS photometric object
50- 58 F9.5 deg DEdeg J2000 Declination of SDSS photometric object
60- 66 F7.3 mag umag ?=99.999 SDSS u-band magnitude (PSFMAG) (6)
68- 74 F7.3 mag gmag ?=99.999 SDSS g-band magnitude (PSFMAG) (6)
76- 82 F7.3 mag rmag ?=99.999 SDSS r-band magnitude (PSFMAG) (6)
84- 90 F7.3 mag imag ?=99.999 SDSS i-band magnitude (PSFMAG) (6)
92- 98 F7.3 mag zmag ?=99.999 SDSS z-band magnitude (PSFMAG) (6)
100-106 F7.3 mag e_umag ?=- Mean error on umag (PSFMAGERR)
108-114 F7.3 mag e_gmag ?=- Mean error on gmag (PSFMAGERR)
116-122 F7.3 mag e_rmag ?=99.999 Mean error on rmag (PSFMAGERR)
124-130 F7.3 mag e_imag ?=99.999 Mean error on imag (PSFMAGERR)
132-138 F7.3 mag e_zmag ?=99.999 Mean error on zmag (PSFMAGERR)
140-145 F6.3 mag Au Extinction in u-band (EXTINCTION)
147-152 F6.3 mag Ag Extinction in g-band (EXTINCTION)
154-159 F6.3 mag Ar Extinction in r-band (EXTINCTION)
161-166 F6.3 mag Ai Extinction in i-band (EXTINCTION)
168-173 F6.3 mag Az Extinction in z-band (EXTINCTION)
175-184 F10.4 d MJDr Modified Julian Date of r-band observation
188-191 I4 km/s RV ?=- Radial velocity
194 I1 --- SpT [0/9] M-type spectral subtype
196-204 F9.3 0.1nm W(Ha) Equivalent width of H-α (Å) (EWHA)
206-214 F9.3 0.1nm e_W(Ha) Mean error on W(Ha) (EWHAERR)
217-224 F8.2 --- HaS/N S/N ratio near H-α (HASN)
228-233 F6.2 --- Ha/c ratio of H-α height over the noise
in the continuum (HADIFF)
235-243 F9.3 0.1nm W(Hb) Equivalent width of H-β (Å) (EWHB)
245-253 F9.3 0.1nm e_W(Hb) Mean error on W(Hb) (EWHBERR)
256-263 F8.2 --- HbS/N S/N ratio near H-β (HBSN)
268-273 F6.2 --- Hb/c ratio of H-β height over the noise
in the continuum (HBDIFF)
275-283 F9.3 0.1nm W(Hg) Equivalent width of H-γ (Å) (EWHG)
285-293 F9.3 0.1nm e_W(Hg) Mean error on W(Hg) (EWHGERR)
296-303 F8.2 --- HgS/N ?=- S/N ratio near H-γ (HGSN)
308-313 F6.2 --- Hg/c ?=- ratio of H-γ height over the noise
in the continuum (HGDIFF)
315-323 F9.3 0.1nm W(Hd) Equivalent width of H-δ (Å) (EWHD)
325-333 F9.3 0.1nm e_W(Hd) Mean error on W(Hd) (EWHDERR)
336-343 F8.2 --- HdS/N ? signal-to-noise ratio near H-δ (HDSN)
348-353 F6.2 --- Hd/c ? ratio of H-δ height over the noise
in the continuum (HDDIFF)
355-363 F9.3 0.1nm W(Ca) Equivalent width of CaII-K (Å)(EWCAK)
365-373 F9.3 0.1nm e_W(Ca) Mean error on W(CaK) (EWCAKERR)
375-383 F9.2 --- CaS/N ?=- S/N ratio near CaII-K (CAKSN)
388-393 F6.2 --- CA/c ?=- ratio of Ca II K height over the noise
in the continuum (CAKDIFF)
395-401 F7.3 0.1nm TiO5 ?=-99.999 TiO band strength from Hammer
(Covey et al. 2007AJ....134.2398C 2007AJ....134.2398C)
403-409 F7.3 0.1nm CaH1 ?=-99.999 CaH1 band strength (2)
411-417 F7.3 0.1nm CaH2 ?=-99.999 CaH2 band strength (2)
419-425 F7.3 0.1nm CaH3 ?=-99.999 CaH3 band strength (2)
427-433 F7.3 0.1nm TiO1 ?=-99.999 TiO1 band strength (2)
435-441 F7.3 0.1nm TiO2 ?=-99.999 TiO2 band strength (2)
443-449 F7.3 0.1nm TiO3 ?=-99.999 TiO3 band strength (2)
451-457 F7.3 0.1nm TiO4 ?=-99.999 TiO4 band strength (2)
459-465 F7.3 0.1nm TiO5R Reid et al. TiO5 index (TIO5_2) (2)
467-473 F7.3 0.1nm TiO8 ?=-99.999 TiO8 band strength (2)
475-481 F7.3 0.1nm CaOH ?=-99.999 CaOH band strength (2)
483-489 F7.3 0.1nm e_TiO5 ?=999.999 Mean error on TiO5 (TIO5ERR)
491-497 F7.3 0.1nm e_CaH1 ?=999.999 Mean error on CaH1 (CAH1ERR)
499-505 F7.3 0.1nm e_CaH2 ?=999.999 Mean error on CaH2 (CAH2ERR)
507-513 F7.3 0.1nm e_CaH3 ?=999.999 Mean error on CaH3 (CAH3ERR)
515-521 F7.3 0.1nm e_TiO1 ?=999.999 Mean error on TiO1 (TIO1ERR)
523-529 F7.3 0.1nm e_TiO2 ?=999.999 Mean error on TiO2 (TIO2ERR)
531-537 F7.3 0.1nm e_TiO3 ?=999.999 Mean error on TiO3 (TIO3ERR)
539-545 F7.3 0.1nm e_TiO4 ?=999.999 Mean error on TiO4 (TIO4ERR)
547-553 F7.3 0.1nm e_TiO5R ?=999.999 Mean error on TiO5R (TIO5ERR2)
555-561 F7.3 0.1nm e_TiO8 ?=999.999 Mean error on TiO8 (TIO8ERR)
563-569 F7.3 0.1nm e_CaOH ?=999.999 Mean error on CaOH (CAOHERR)
571-574 I4 --- run SDSS run number
576-578 I3 --- rerun SDSS rerun number
580 I1 --- cam SDSS camcol number (CAMCOL)
582-584 I3 --- field SDSS field number
586-590 I5 --- obj SDSS object number in field
592-599 F8.2 mas/yr pmRA ?=-9999 Proper Motion in Right Ascension (5)
601-608 F8.2 mas/yr pmDE ?=-9999 Proper Motion in Declination (5)
610-617 F8.2 mas/yr e_pmRA Mean error on pmRA
619-626 F8.2 mas/yr e_pmDE Mean error on pmDE
628 I1 --- NU [0/2] Number of objects in USNO-B that matched
within 1arcsec. (MATCH)
630-635 F6.2 arcsec r22 Distance to nearest g<22mag neighbor (DIST22)
637 I1 --- Nd Number of detections (plates on which the object
was detected in USNO-B +1) (NFIT)
639-644 F6.2 mag Omag ?=-99.99 Recalibrated USNO-B O magnitude (USNO_O)
646-651 F6.2 mag Bjmag ?=-99.99 Recalibrated Bj magnitude (USNO_J)
653-659 F7.2 mas sigRA rms residual for the proper motion fit in RA
661-667 F7.2 mas sigDE rms residual for the proper motion fit in Dec
669-677 F9.5 deg RA2deg ?=- 2MASS right ascension (RA2MASS)
679-687 F9.5 deg DE2deg ?=- 2MASS declination (DEC2MASS)
689-694 F6.3 mag Jmag ?=- 2MASS J-band magnitude
696-701 F6.3 mag Hmag ?=- 2MASS H-band magnitude
703-708 F6.3 mag Kmag ?=- 2MASS Ks-band magnitude
710-715 F6.3 mag e_Jmag ?=- Mean error on Jmag
717-722 F6.3 mag e_Hmag ?=- Mean error on Hmag
724-729 F6.3 mag e_Kmag ?=- Mean error on Kmag
731-739 F9.1 d JD2M ?=- Julian Date of 2MASS photometry (MJD_2MASS)
742-749 F8.1 pc Dist [12/] Photometric distance to object, see
Bochanski et al. 2010AJ....139.2679B 2010AJ....139.2679B
751-758 F8.4 deg Glon galactic longitude (LGAL)
760-767 F8.4 deg Glat galactic latitude (BGAL)
769-776 F8.1 km/s U ?=-99999.9 Velocity toward Galactic center (4)
778-785 F8.1 km/s V ?=-99999.9 Velocity toward Galactic rotation (4)
787-794 F8.1 km/s W ?=-99999.9 Velocity toward North Galactic Pole(4)
796-803 F8.1 pc X ?=-99999.9 Galactocentric cartesian position (3)
805-812 F8.1 pc Y ?=-99999.9 Galactocentric cartesian position (3)
814-821 F8.1 pc Z ?=-99999.9 Galactocentric cartesian position (3)
823-830 F8.1 km/s VX ?=-99999.9 Galactocentric cartesian velocity (4)
832-839 F8.1 km/s VY ?=-99999.9 Galactocentric cartesian velocity (4)
841-848 F8.1 km/s VZ ?=-99999.9 Galactocentric cartesian velocity (4)
850-857 F8.1 pc Rg ?=-99999.9 Galactocentric cylindrical coordinate
(Rg=sqrt(X2+Y2) (4)
859-865 F7.4 rad theta [-1.57/1.57] Cylindrical coordinate vector angle
θ (X=Rg.cosθ) (4)
867-874 F8.1 km/s VR ?=-99999.9 Velocity in radial direction (4)
876-883 F8.1 km/s Vt ?=-99999.9 Velocity in tangential direction (4)
885 I1 --- q [0/1] Combination of SDSS quality flags
(0=bad; 1=good) (GOODPHOT)
887-891 I5 --- MHa [0/1]?=-9999 Magnetic activity state in H-α
1=active (ACTHA)
893-897 I5 --- MHb [0/1]?=-9999 Magnetic activity state in H-β
1=active (ACTHB)
899-903 I5 --- MHg [0/1]?=-9999 Magnetic activity state in H-γ
1=active (ACTHG)
905-909 I5 --- MHd [0/1]?=-9999 Magnetic activity state in H-δ
1=active (ACTHD)
911-915 I5 --- MCa [0/1]?=-9999 Magnetic activity state in CaII-K
1=active (ACTCAK)
917-922 F6.3 --- LHa/b Ratio H-α/bolometric luminosity (LHALBOL)
924-929 F6.3 --- LHb/b Ratio H-α/bolometric luminosity (LHBLBOL)
931-936 F6.3 --- LHg/b Ratio H-α/bolometric luminosity (LHGLBOL)
938-943 F6.3 --- LHd/b Ratio H-α/bolometric luminosity (LHDLBOL)
945-950 F6.3 --- LCa/b ?=- Ratio CaII-K/bolometric luminosity (LCAKLBOL)
952-956 F5.3 --- e_LHa/b Mean error on LHa/b (LHALBOLERR)
958-962 F5.3 --- e_LHb/b Mean error on LHb/b (LHBLBOLERR)
964-968 F5.3 --- e_LHg/b Mean error on LHg/b (LHGLBOLERR)
970-974 F5.3 --- e_LHd/b Mean error on LHd/b (LHDLBOLERR)
976-980 F5.3 --- e_LCa/b ?=- Mean error on LCa/b (LCAKLBOLERR)
982-988 F7.3 --- zeta Metallicity proxy ζ (1)
990-996 F7.3 --- e_zeta Mean error on zeta
998 I1 --- WDM [0/1] 1=Likely white dwarf/M dwarf candidate
from Morgan et al. (2012AJ....144...93M 2012AJ....144...93M)
1000 I1 --- pmOK [0/1] 1=satisfies proper motion criteria from
Munn et al. 2004AJ....127.3034M 2004AJ....127.3034M (GOODPM)
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Note (1): ζ is defined in Lepine et al. (2007ApJ...669.1235L 2007ApJ...669.1235L) ,
and is related to the metallicity: ζ<1 are metal-poor,
ζ>1 are meta-rich
Note (2): index defined in Reid et al. 1995AJ....110.1838R 1995AJ....110.1838R
Note (3): galactocentric frame, where the Sun is at
(x,y,z)☉=(8500,0,15)pc
Note (4): Velocity of the Sun in LSR is (U,V,W)☉=(-10,5,7);
the rotation velocity at Sun's position is 220km/s.
Note (5): Proper motion from USNO-B matches (Munn et al. 2004AJ....127.3034M 2004AJ....127.3034M
Note (6): Magnitudes are from PSF fit, and extinction corrected.
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History:
* 01-Aug-2012: FITS file from the author (Andrew A. West)
* 15-Oct-2014: Standardized table; removed spurious record #62758
(an odd match with plate-MJD-fiber=2713-54400-501)
(End) Francois Ochsenbein [CDS] 01-Aug-2012