J/AJ/161/234 1.7 million K and M dwarfs cross-matching (Medan+, 2021)
Bayesian cross-matching of high proper motion stars in Gaia DR2 and photometric
metallicities for 1.7 million K and M dwarfs.
Medan I., Lepine S., Hartman Z.
<Astron. J. 161, 234 (2021)>
=2021AJ....161..234M 2021AJ....161..234M (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Cross identifications ; Abundances, [Fe/H]
Keywords: Catalogs (205) - Sky surveys (1464) - Astrometry (80) -
Chemical abundances (224)
Abstract:
We present a Bayesian method to cross-match 5827988 high
proper-motion Gaia sources (µ>40mas/yr) to various photometric
surveys: Two Micron All Sky Survey, AllWISE data release from the
Wide-field Infrared Explorer (WISE) mission, Galaxy Evolution
Explorer, Radial Velocity Experiment, Sloan Digital Sky Survey, and
Panoramic Survey Telescope and Rapid Response System (Pan-STARRS). To
efficiently associate these objects across catalogs, we develop a
technique that compares the multidimensional distribution of all
sources in the vicinity of each Gaia star to a reference distribution
of random field stars obtained by extracting all sources in a region
on the sky displaced 2'. This offset preserves the local field
stellar density and magnitude distribution, allowing us to
characterize the frequency of chance alignments. The resulting catalog
with Bayesian probabilities >95% has a marginally higher match rate
than current internal Gaia data release 2 (DR2) matches for most
catalogs. However, a significant improvement is found with Pan-STARRS,
where ∼99.8% of the sample within the Pan-STARRS footprint is
recovered, as compared to a low ∼20.8% in Gaia DR2. Using these
results, we train a Gaussian process regressor to calibrate two
photometric metallicity relationships. For dwarfs of 3500<Teff<5280K,
we use metallicity values of 4378 stars from the Apache Point
Observatory Galactic Evolution Experiment and Hejazi et al. to
calibrate the relationship, producing results with a 1σ
precision of 0.12dex and few systematic errors. We then indirectly
infer the metallicity of 4018 stars with 2850<Teff<3500K, which are
wide companions of primaries whose metallicities are estimated with
our first regressor, to produce a relationship with a 1σ
precision of 0.21dex and significant systematic errors. Additional
work is needed to better remove unresolved binaries from this second
sample to reduce these systematic errors.
Description:
Results of a Bayesian method that cross-match 5827988 high
proper-motion Gaia sources (µ>40mas/yr) to various photometric
surveys: Two Micron All Sky Survey, AllWISE data release from the
Wide-field Infrared Explorer (WISE) mission, Galaxy Evolution
Explorer, Radial Velocity Experiment, Sloan Digital Sky Survey, and
Panoramic Survey Telescope and Rapid Response System (Pan-STARRS).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 835 5827988 Best matches found in this study with a Bayesian
probability greater than 95% for all
cross matches in this study
table3.dat 164 8767235 All of the possible matches for the cross match
between Gaia and 2MASS
table4.dat 182 7929318 All of the possible matches for the cross match
between Gaia and AllWISE
table5.dat 151 950881 All of the possible matches for the cross match
between Gaia and GALEX DR5
table6.dat 209 20455196 All of the possible matches for the cross match
between Gaia and Pan-STARRS
table7.dat 194 9487426 All of the possible matches for the cross match
between Gaia and SDSS DR12
table8.dat 173 74448 All of the possible matches for the cross match
between Gaia and RAVE DR5
table12.dat 64 716651 List of predicted metallicities for 716651 K
and early M dwarfs using the Gaussian Process
Regressor outlined in Section 4.1
table13.dat 64 1030761 List of predicted metallicities for 1030761 M
dwarfs using the Gaussian Process Regressor
outlined in Section 4.2
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
II/328 : AllWISE Data Release (Cutri+ 2013)
III/279 : RAVE 5th data release (Kunder+, 2017)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 identifier (Cat. I/345)
21- 29 F9.6 mag Gmag Gaia DR2 G-band magnitude (G1)
31- 39 F9.6 mag BPmag ?=100 Gaia DR2 BP-band magnitude (2)
41- 49 F9.6 mag RPmag ?=100 Gaia DR2 RP-band magnitude (3)
51- 65 F15.11 deg RAdeg Gaia DR2 Right Ascension (ICRS) at Ep=2015.5
67- 81 F15.11 deg DEdeg Gaia DR2 Declination (ICRS) at Ep=2015.5
83- 92 F10.4 mas plx Gaia DR2 parallax
94- 99 F6.4 mas e_plx Uncertainty in plx
101-109 F9.3 mas/yr pmRA Gaia DR2 proper motion in RA, pmRA*cosDE (4)
111-119 F9.3 mas/yr pmDE Gaia DR2 proper motion in DE (5)
121-139 A19 --- SDSS SDSS DR12 identifier (Cat. V/147) (?=99.0)
141-146 F6.3 mag umagS ?=99 SDSS DR12 u-band AB magnitude
148-153 F6.3 mag e_umagS ?=99 Uncertainty in umagS
155-160 F6.3 mag gmagS ?=99 SDSS DR12 g-band AB magnitude
162-167 F6.3 mag e_gmagS ?=99 Uncertainty in gmagS
169-174 F6.3 mag rmagS ?=99 SDSS DR12 r-band AB magnitude
176-181 F6.3 mag e_rmagS ?=99 Uncertainty in rmagS
183-188 F6.3 mag imagS ?=99 SDSS DR12 i-band AB magnitude
190-195 F6.3 mag e_imagS ?=99 Uncertainty in imagS
197-202 F6.3 mag zmagS ?=99 SDSS DR12 z-band AB magnitude
204-209 F6.3 mag e_zmagS ?=99 Uncertainty in zmagS
211-220 F10.6 deg RASdeg ?=99 SDSS DR12 Right Ascension (J2000)
222-231 F10.6 deg DESdeg ?=99 SDSS DR12 Declination (J2000)
233-242 F10.7 --- SDSSProb ?=99 Total Bayesain probability of
SDSS DR12 to Gaia DR2
244-253 F10.7 arcsec SDSSSep ?=99 Angular separation between
SDSS DR12 and Gaia DR2 at mean epoch
255-271 A17 --- 2MASS 2MASS identifier (Cat. VII/233) (6)
273-278 F6.3 mag Jmag ?=99 2MASS J band magnitude (7)
280-285 F6.3 mag e_Jmag ?=99 Uncertainty in Jmag (8)
287-292 F6.3 mag Hmag ?=99 2MASS H band magnitude (7)
294-299 F6.3 mag e_Hmag ?=99 Uncertainty in Hmag (8)
301-306 F6.3 mag Ksmag ?=99 2MASS Ks band magnitude (7)
308-313 F6.3 mag e_Ksmag ?=99 Uncertainty in Ksmag (8)
315-324 F10.6 deg RA2deg ?=99 2MASS Right Ascension (J2000)
326-335 F10.6 deg DE2deg ?=99 2MASS Declination (J2000)
337-346 F10.7 --- 2MASSProb ?=99 Total Bayesain probability of
2MASS to Gaia DR2
348-357 F10.7 arcsec 2MASSSep ?=99 Angular separation between
2MASS and Gaia DR2 at mean epoch
359-377 A19 --- AllWISE AllWISE identifier (Cat. II/328)
379-384 F6.3 mag W1mag ?=99 AllWISE W1-band magnitude
386-391 F6.3 mag e_W1mag ?=99 Uncertainty in W1mag
393-398 F6.3 mag W2mag ?=99 AllWISE W2-band magnitude
400-405 F6.3 mag e_W2mag ?=99 Uncertainty in W2mag
407-412 F6.3 mag W3mag ?=99 AllWISE W3-band magnitude
414-419 F6.3 mag e_W3mag ?=99 Uncertainty in W3mag
421-426 F6.3 mag W4mag ?=99 AllWISE W4-band magnitude
428-433 F6.3 mag e_W4mag ?=99 Uncertainty in W4mag
435-445 F11.7 deg RAWdeg ?=99 AllWISE Right Ascension (J2000)
447-457 F11.7 deg DEWdeg ?=99 AllWISE Declination (J2000)
459-468 F10.7 --- WISEProb ?=99 Total Bayesain probability of
AllWISE to Gaia DR2
470-479 F10.7 arcsec WISESep ?=99 Angular separation between
AllWISE and Gaia DR2
481-499 A19 --- GALEX GALEX DR5 identifier (Cat. II/312)
501-506 F6.3 mag FUVmag ?=99 GALEX DR5 FUV band magnitude
508-513 F6.3 mag e_FUVmag ?=99 Uncertainty in FUVmag
515-520 F6.3 mag NUVmag ?=99 GALEX DR5 NUV band magnitude
522-527 F6.3 mag e_NUVmag ?=99 Uncertainty in NUVmag
529-538 F10.6 deg RAGdeg ?=99 GALEX DR5 Right Ascension (J2000) (9)
540-549 F10.6 deg DEGdeg ?=99 GALEX DR5 Declination (J2000) (9)
551-560 F10.7 --- GALEXProb ?=99 Total Bayesain probability of
GALEX to Gaia DR2
562-571 F10.7 arcsec GALEXSep ?=99 Angular separation between
GALEX and Gaia DR2 at mean epoch
573-590 I18 --- PS1 ?=99 Pan-STARRS identifier (Cat. II/349)
592-598 F7.4 mag gmagP ?=99 Pan-STARRS g-band AB magnitude
600-606 F7.4 mag e_gmagP ?=99 Uncertainty in Pgmag
608-614 F7.4 mag rmagP ?=99 Pan-STARRS r-band AB magnitude
616-622 F7.4 mag e_rmagP ?=99 Uncertainty in Prmag
624-630 F7.4 mag imagP ?=99 Pan-STARRS i-band AB magnitude
632-638 F7.4 mag e_imagP ?=99 Uncertainty in Pimag
640-646 F7.4 mag zmagP ?=99 Pan-STARRS z-band AB magnitude
648-654 F7.4 mag e_zmagP ?=99 Uncertainty in Pzmag
656-662 F7.4 mag ymagP ?=99 Pan-STARRS y-band AB magnitude
664-670 F7.4 mag e_ymagP ?=99 Uncertainty in Pymag
672-684 F13.9 deg RAPdeg ?=99 Pan-STARRS Right Ascension (J2000) (10)
686-698 F13.9 deg DEPdeg ?=99 Pan-STARRS Declination (J2000) (10)
700-709 F10.7 --- PS1Prob ?=99 Total Bayesain probability of
Pan-STARRS to Gaia DR2
711-720 F10.7 arcsec PS1Sep ?=99 Angular separation between
Pan-STARRS and Gaia DR2
722-737 A16 --- RAVE RAVE DR5 identifier (Cat. III/279)
739-744 F6.3 mag BTmag ?=99 RAVE DR5 Tycho-2 BT magnitude
746-751 F6.3 mag e_BTmag ?=99 Uncertainty in BTmag
753-758 F6.3 mag VTmag ?=99 RAVE DR5 Tycho-2 VT magnitude
760-765 F6.3 mag e_VTmag ?=99 Uncertainty in VTmag
767-788 F22.18 deg RARdeg ?=99 RAVE DR5 Right Ascension (J2000)
789-811 F23.19 deg DERdeg ?=99 RAVE DR5 Declination (J2000)
813-822 F10.7 --- RAVEProb ?=99 Total Bayesain probability of
RAVE to Gaia DR2
824-833 F10.7 arcsec RAVESep ?=99 Angular separation between
RAVE and Gaia DR2 at mean epoch
--------------------------------------------------------------------------------
Note (2): Mean magnitude in the integrated BP band. This is computed from the
BP-band mean flux applying the magnitude zero-point in the Vega scale.
No error is provided for this quantity as the error distribution is
only symmetric in flux space. This converts to an asymmetric error
distribution in magnitude space which cannot be represented by a
single error value (Gaia Collaboration et al., 2018A&A...616A...1G 2018A&A...616A...1G,
Cat. I/345).
Note (3): Mean magnitude in the integrated RP band. This is computed from the
RP-band mean flux applying the magnitude zero-point in the Vega scale.
No error is provided for this quantity as the error distribution is
only symmetric in flux space. This converts to an asymmetric error
distribution in magnitude space which cannot be represented by a
single error value (Gaia Collaboration et al., 2018A&A...616A...1G 2018A&A...616A...1G,
Cat. I/345).
Note (4): Proper motion in right ascension of the source in ICRS at the
reference epoch. This is the tangent plane projection of the proper
motion vector in the direction of increasing right ascension
(Gaia Collaboration et al., 2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345).
Note (5): Proper motion in declination of the source at the reference epoch.
This is the tangent plane projection of the proper motion vector in
the direction of increasing declination (Gaia Collaboration et al.,
2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345).
Note (6): Sexagesimal, equatorial position-based source name in the form:
hhmmssss+ddmmsss[ABC...] Skrutskie et al. (2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233).
Note (7): This is the selected "default" magnitude for each band, [JHK]. If the
source is not detected in the band, this is the 95% confidence upper
limit derived from a 4" radius aperture measurement taken at the
position of the source on the Atlas Image. The origin of the default
magnitude is given by the first character of the Rflg value (Rflg)
in the original catalog. This column is null if the source is
nominally detected in the band, but no useful brightness estimate
could be made (Rflg="9") Skrutskie et al. (2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233).
Note (8): Combined, or total photometric uncertainty [JHK]msigcom for the
default magnitude in that band. The combined uncertainty is derived
from the following relation:
e [JHK]mag = sqrt([JHK]cmsig2 + [JHK]zperr2 + fferr2 + [r1normrms2]),
where cmsig = Corrected band photometric uncertainty,
zperr = Nightly photometric zero point uncertainty = 0.011 mag,
fferr = Flat-fielding residual error = 0.005 mags,
r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for
sources with Rflg="1"). This column is null if the default magnitude is a 95%
confidence upper limit (i.e. the source is not detected, or inconsistently
deblended in the band)) Skrutskie et al. (2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233).
Note (9): Position of the NUV source, or FUV if seen in FUV
only (Bianchi et al., 2011Ap&SS.335..161B 2011Ap&SS.335..161B, Cat. II/312).
Note (10): Coordinates from single epoch detections (weighted mean) in equinox
J2000 at the mean epoch given by mean epoch from object
(Chambers et al., 2016, arXiv:1612.05560, Cat. II/349).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 identifier
21- 29 F9.6 mag Gmag Gaia DR2 G-band magnitude (G1)
31- 45 F15.11 deg RAdeg Gaia DR2 Right Ascension (ICRS) at Ep=2015.5
47- 61 F15.11 deg DEdeg Gaia DR2 Declination (ICRS) at Ep=2015.5
63- 79 A17 --- 2MASS 2MASS identifier (Cat. VII/233) (2)
81- 86 F6.3 mag Jmag ?=99.0 2MASS J band magnitude (3)
88- 93 F6.3 mag e_Jmag ?=99.0 Uncertainty in Jmag (4)
95-100 F6.3 mag Hmag ?=99.0 2MASS H band magnitude (3)
102-107 F6.3 mag e_Hmag ?=99.0 Uncertainty in Hmag (4)
109-114 F6.3 mag Ksmag ?=99.0 2MASS Ks band magnitude (3)
116-121 F6.3 mag e_Ksmag ?=99.0 Uncertainty in Ksmag (4)
123-132 F10.6 deg RA2deg 2MASS Right Ascension (J2000)
134-143 F10.6 deg DE2deg 2MASS Declination in (J2000)
145-153 F9.7 --- 2MASSProb Total Bayesain probability of
2MASS to Gaia DR2
155-164 F10.7 arcsec 2MASSSep Angular separation between
2MASS and Gaia DR2 at mean epoch
--------------------------------------------------------------------------------
Note (2): Sexagesimal, equatorial position-based source name in the form:
hhmmssss+ddmmsss[ABC...] Skrutskie et al. (2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233).
Note (3): This is the selected "default" magnitude for each band, [JHK]. If the
source is not detected in the band, this is the 95% confidence upper limit
derived from a 4" radius aperture measurement taken at the position of the
source on the Atlas Image. The origin of the default magnitude is given by
the first character of the Rflg value (Rflg) in the original catalog.
This column is null if the source is nominally detected in the band, but no
useful brightness estimate could be made (Rflg="9") Skrutskie et al.
(2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233).
Note (4): Combined, or total photometric uncertainty [JHK]msigcom for the
default magnitude in that band. The combined uncertainty is derived from the
following relation:
e [JHK]mag = sqrt([JHK]cmsig2 + [JHK]zperr2 + fferr2 + [r1normrms2]),
where cmsig = Corrected band photometric uncertainty,
zperr = Nightly photometric zero point uncertainty = 0.011 mag,
fferr = Flat-fielding residual error = 0.005 mags,
r1normrms = R1 normalization uncertainty = 0.012 mags (applied only for
sources with Rflg="1"). This column is null if the default magnitude is a 95%
confidence upper limit (i.e. the source is not detected, or inconsistently
deblended in the band)) Skrutskie et al. (2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 identifier
21- 29 F9.6 mag Gmag Gaia DR2 G-band magnitude (G1)
31- 45 F15.11 deg RAdeg Gaia DR2 Right Ascension (ICRS) at Ep=2015.5
47- 61 F15.11 deg DEdeg Gaia DR2 Declination (ICRS) at Ep=2015.5
63- 81 A19 --- AllWISE AllWISE identifier (Cat. II/328)
83- 88 F6.3 mag W1mag ?=99.0 AllWISE W1-band magnitude
90- 95 F6.3 mag e_W1mag ?=99.0 Uncertainty in W1mag
97-102 F6.3 mag W2mag ?=99.0 AllWISE W2-band magnitude
104-109 F6.3 mag e_W2mag ?=99.0 Uncertainty in W2mag
111-116 F6.3 mag W3mag ?=99.0 AllWISE W3-band magnitude
118-123 F6.3 mag e_W3mag ?=99.0 Uncertainty in W3mag
125-130 F6.3 mag W4mag ?=99.0 AllWISE W4-band magnitude
132-137 F6.3 mag e_W4mag ?=99.0 Uncertainty in W4mag
139-149 F11.7 deg RAAdeg AllWISE Right Ascension (J2000)
151-161 F11.7 deg DEAdeg AllWISE Declination (J2000)
163-171 F9.7 --- WISEProb Total Bayesain probability of
AllWISE to Gaia DR2
173-182 F10.7 arcsec WISESep Angular separation between
AllWISE and Gaia DR2 at mean epoch
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 identifier
21- 29 F9.6 mag Gmag Gaia DR2 G-band magnitude (G1)
31- 45 F15.11 deg RAdeg Gaia DR2 Right Ascension (ICRS) at Ep=2015.5
47- 61 F15.11 deg DEdeg Gaia DR2 Declination (ICRS) at Ep=2015.5
63- 81 A19 --- GALEX GALEX DR5 identifier (Cat. II/312)
83- 88 F6.3 mag FUVmag ?=99.0 GALEX DR5 FUV band magnitude
90- 95 F6.3 mag e_FUVmag ?=99.0 Uncertainty in FUVmag
97-102 F6.3 mag NUVmag GALEX DR5 NUV band magnitude
104-108 F5.3 mag e_NUVmag Uncertainty in NUVmag
110-119 F10.6 deg RAGdeg GALEX DR5 Right Ascension (J2000) (2)
121-130 F10.6 deg DEGdeg GALEX DR5 Declination (J2000) (2)
132-140 F9.7 --- GALEXProb Total Bayesain probability of
GALEX to Gaia DR2
142-151 F10.7 arcsec GALEXSep Angular separation between
GALEX and Gaia DR2 at mean epoch
--------------------------------------------------------------------------------
Note (2): Position of the NUV source, or FUV if seen in FUV
only (Bianchi et al., 2011Ap&SS.335..161B 2011Ap&SS.335..161B, Cat. II/312).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 identifier
21- 29 F9.6 mag Gmag Gaia DR2 G-band magnitude (G1)
31- 45 F15.11 deg RAdeg Gaia DR2 Right Ascension (J2015.5)
47- 61 F15.11 deg DEdeg Gaia DR2 Declination (J2015.5)
63- 80 I18 --- PS1 Pan-STARRS identifier (Cat. II/349)
82- 88 F7.4 mag gmagP ?=99.0 Pan-STARRS g-band AB magnitude
90- 96 F7.4 mag e_gmagP ?=99.0 Uncertainty in Pgmag
98-104 F7.4 mag rmagP ?=99.0 Pan-STARRS r-band AB magnitude
106-112 F7.4 mag e_rmagP ?=99.0 Uncertainty in Prmag
114-120 F7.4 mag imagP ?=99.0 Pan-STARRS i-band AB magnitude
122-128 F7.4 mag e_imagP ?=99.0 Uncertainty in Pimag
130-136 F7.4 mag zmagP ?=99.0 Pan-STARRS z-band AB magnitude
138-144 F7.4 mag e_zmagP ?=99.0 Uncertainty in Pzmag
146-152 F7.4 mag ymagP ?=99.0 Pan-STARRS y-band AB magnitude
154-160 F7.4 mag e_ymagP ?=99.0 Uncertainty in Pymag
162-174 F13.9 deg RAPdeg Pan-STARRS Right Ascension (J2000) (2)
176-188 F13.9 deg DEPdeg Pan-STARRS Declination (J2000) (2)
190-198 F9.7 --- PS1Prob Total Bayesain probability of
Pan-STARRS to Gaia DR2
200-209 F10.7 arcsec PS1Sep Angular separation between
Pan-STARRS and Gaia DR2 at mean epoch
--------------------------------------------------------------------------------
Note (2): Coordinates from single epoch detections (weighted mean) in equinox
J2000 at the mean epoch given by mean epoch from object
(Chambers et al., 2016, arXiv:1612.05560, Cat. II/349).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 identifier
21- 29 F9.6 mag Gmag Gaia DR2 G-band magnitude (G1)
31- 45 F15.11 deg RAdeg Gaia DR2 Right Ascension (ICRS) at Ep=2015.5
47- 61 F15.11 deg DEdeg Gaia DR2 Declination (ICRS) at Ep=2015.5
63- 81 A19 --- SDSS SDSS DR12 identifier (Cat. V/147)
83- 88 F6.3 mag umagS ?=99.0 SDSS DR12 u-band AB magnitude
90- 95 F6.3 mag e_umagS ?=99.0 Uncertainty in umagS
97-102 F6.3 mag gmagS ?=99.0 SDSS DR12 g-band AB magnitude
104-109 F6.3 mag e_gmagS ?=99.0 Uncertainty in gmagS
111-116 F6.3 mag rmagS ?=99.0 SDSS DR12 r-band AB magnitude
118-123 F6.3 mag e_rmagS ?=99.0 Uncertainty in rmagS
125-130 F6.3 mag imagS ?=99.0 SDSS DR12 i-band AB magnitude
132-137 F6.3 mag e_imagS ?=99.0 Uncertainty in imagS
139-144 F6.3 mag zmagS ?=99.0 SDSS DR12 z-band AB magnitude
146-151 F6.3 mag e_zmagS ?=99.0 Uncertainty in zmagS
153-162 F10.6 deg RASdeg SDSS DR12 Right Ascension (J2000)
164-173 F10.6 deg DESdeg SDSS DR12 Declination (J2000)
175-183 F9.7 --- SDSSProb Total Bayesain probability of
SDSS DR12 to Gaia DR2
185-194 F10.7 arcsec SDSSSep Angular separation between
SDSS DR12 and Gaia DR2 at mean epoch
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 identifier
21- 29 F9.6 mag Gmag Gaia DR2 G-band magnitude (G1)
31- 45 F15.11 deg RAdeg Gaia DR2 Right Ascension (ICRS) at Ep=2015.5
47- 61 F15.11 deg DEdeg Gaia DR2 Declination (ICRS) at Ep=2015.5
63- 78 A16 --- RAVE RAVE DR5 identifier (III/279)
80- 85 F6.3 mag BTmag ?=99.0 RAVE DR5 Tycho-2 BT magnitude
87- 92 F6.3 mag e_BTmag ?=99.0 Uncertainty in BTmag
94- 99 F6.3 mag VTmag ?=99.0 RAVE DR5 Tycho-2 VT magnitude
101-106 F6.3 mag e_VTmag ?=99.0 Uncertainty in VTmag
108-128 F21.17 deg RARdeg RAVE DR5 Right Ascension (J2000)
130-152 F23.19 deg DERdeg RAVE DR5 Declination (J2000)
154-162 F9.7 --- RAVEProb Total Bayesain probability of RAVE to Gaia DR2
164-173 F10.7 arcsec RAVESep Angular separation between RAVE and
Gaia DR2 at mean epoch
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table12.dat table13.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 identifier (1)
21- 35 F15.11 deg RAdeg Gaia DR2 Right Ascension (J2015.5)
37- 51 F15.11 deg DEdeg Gaia DR2 Declination (J2015.5)
53- 58 F6.3 [-] [M/H] log predicted metallicity relative to hydrogen
60- 64 F5.3 [-] e_[M/H] Uncertainty in [M/H]
--------------------------------------------------------------------------------
Note (1): The regressor uses the following data inputs, Mg, g-y, y-W2, J-W2,
W1-W2, and stars are included only if they pass the single star
polynomial cuts outline in Table 9.
--------------------------------------------------------------------------------
Global notes:
Note (G1): This is computed from the G-band mean flux applying the magnitude
zero-point in the Vega scale. No error is provided for this quantity
as the error distribution is only symmetric in flux space. This
converts to an asymmetric error distribution in magnitude space
which cannot be represented by a single error value
(Gaia Collaboration et al., 2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345).
--------------------------------------------------------------------------------
Acknowledgements:
Ilija Miroslav Medan, imedan1(at)gsu.edu
(End) Patricia Vannier [CDS] 15-Jun-2022