J/ApJS/271/26 Stellar loci. VII. FGK stars from GALEX and Gaia (Lu+, 2024)
Stellar loci.
VII. Photometric metallicities of 5 million FGK stars based on GALEX GR6+7 AIS
and Gaia EDR3.
Lu X., Yuan H., Xu S., Zhang R., Xiao K., Huang Y., Beers T.C., Hong J.
<Astrophys. J. Suppl. Ser., 271, 26 (2024)>
=2024ApJS..271...26L 2024ApJS..271...26L
ADC_Keywords: Stars, dwarfs; Stars, giant; Parallaxes, trigonometric;
Proper motions; Photometry, UBV; Magnitudes, absolute; Colors;
Surveys; Radial velocities; Abundances, [Fe/H]; Ultraviolet
Keywords: Fundamental parameters of stars ; Galaxy stellar content ;
Astronomy data analysis ; Metallicity ; Near ultraviolet astronomy
Abstract:
We combine photometric data from GALEX GR6+7 All-Sky Imaging Survey
and Gaia Early Data Release 3 with stellar parameters from the SAGA
and PASTEL catalogs to construct high-quality training samples for
dwarfs (0.4<BP-RP<1.6) and giants (0.6<BP-RP<1.6). We apply careful
reddening corrections using empirical temperature- and
extinction-dependent extinction coefficients. Using the two samples,
we establish a relationship between stellar loci (near-ultraviolet
(NUV)-BP versus BP-RP colors), metallicity, and MG. For a given BP-RP
color, a 1dex change in [Fe/H] corresponds to an approximately 1mag
change in NUV-BP color for solar-type stars. These relationships are
employed to estimate metallicities based on NUV-BP, BP-RP, and MG.
Thanks to the strong metallicity dependence in the GALEX NUV band, our
models enable a typical photometric-metallicity precision of
approximately σ[Fe/H]=0.11dex for dwarfs and
σ[Fe/H]=0.17dex for giants, with an effective metallicity range
extending down to [Fe/H]=-3.0 for dwarfs and [Fe/H]=-4.0 for giants.
We also find that the NUV-band-based photometric-metallicity estimate
is not as strongly affected by carbon enhancement as previous
photometric techniques. With the GALEX and Gaia data, we have
estimated metallicities for about 5 million stars across almost the
entire sky, including approximately 4.5 million dwarfs and 0.5 million
giants. This work demonstrates the potential of the NUV band for
estimating photometric metallicities, and sets the groundwork for
utilizing the NUV data from space telescopes such as the upcoming
Chinese Space Station Telescope.
Description:
GALEX, launched on 2003 April 28, simultaneously performs sky surveys
in two bands through the use of a dichroic beam splitter:
FUV (1344-1786Å) and NUV (1771-2831Å). The field of view of
GALEX is 1.28°/1.24°, with a spatial resolution of 4.2"/5.3"
for the FUV/NUV, respectively. The GALEX GR6+7 All-Sky Imaging Survey
(AIS) database (Bianchi+ 2017, II/335) is a valuable catalog derived
from the mission, containing 214,449,551 source measurements. The
photometric precision of the NUV band varies from 0.0025 to 0.5mag.
We obtain spectroscopic data for the training samples by combining
metallicity information from the Stellar Abundances for the Galactic
Archeology (SAGA) and the PASTEL catalogs. See Section 2.3.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 327 4971805 The final sample catalog
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See also:
B/pastel : The PASTEL catalogue (Soubiran+, 2016-)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
II/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)
J/ApJ/833/20 : Carbon-enhanced metal-poor (CEMP) star abund. (Yoon+, 2016)
J/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)
J/A+A/618/A93 : Gaia DR2 open clusters in the MW (Cantat-Gaudin+, 2018)
J/ApJS/238/16 : LAMOST-DR3 very metal-poor star catalog (Li+, 2018)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
J/ApJS/262/8 : Sp. data of low-metallicity S-PLUS stars (Placco+, 2022)
J/A+A/666/A121 : Cluster target Giraffe HR15N RV precision (Randich+, 2022)
J/ApJS/259/60 : SEGUE-2 updated stellar parameter pipeline (Rockosi+, 2022)
J/A+A/659/A181 : J-PLUS DR1 stellar param, and abundances (Yang+, 2022)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaEDR3 Gaia EDR3 identifier (source_id)
21- 35 F15.11 deg RAdeg Gaia EDR3 right ascension
(ICRS) at Ep=2016.0 (ra)
37- 51 F15.11 deg DEdeg Gaia EDR3 declination
(ICRS) at Ep=2016.0 (dec)
53- 60 F8.5 mas plx [1e-5/79] Gaia EDR3 parallax (parallax)
62- 68 F7.5 mas e_plx [0.007/1.1] plx uncertainty
(parallax_error)
70- 77 F8.5 mas plx-cor [0.02/79]? Parallax corrected by
Lindegren+ 2021A&A...649A...4L 2021A&A...649A...4L
(parallax_corrected)
79- 86 F8.3 mas.yr-1 pmRA [-457/379] Gaia EDR3 proper motion in
RA (pmra)
88- 93 F6.4 mas.yr-1 e_pmRA [0.004/1] pmRA uncertainty (pmra_error)
95- 102 F8.3 mas.yr-1 pmDE [-442/377] Gaia EDR3 proper motion in
DEC (pmdec)
104- 109 F6.4 mas.yr-1 e_pmDE [0.005/1] pmDE uncertainty
(pmdec_error)
111- 116 F6.3 --- ruwe [0.59/74] Renormalized unit weight
error from Gaia EDR3 (ruwe)
118- 122 F5.3 --- E(Bp-Rp) [1.17/1.33] BP/RP excess factor from
Gaia EDR3 (photbprpexcessfactor)
124- 131 F8.5 mag Bpmag [6.5/16.7] Integrated Bp band mean
magnitude from Gaia EDR3
(photbpmean_mag)
133- 140 F8.5 mag Rpmag [5/15.7] Integrated Rp band mean
magnitude from Gaia EDR3
(photrpmean_mag)
142- 149 F8.5 mag Gmag [6/16] Gaia EDR3 G-band mean magnitude
(photgmean_mag)
151- 165 F15.11 deg GLON Gaia EDR3 Galactic longitude (l)
167- 181 F15.11 deg GLAT Gaia EDR3 Galactic latitude (b)
183- 188 F6.3 --- feh-Gaia [-3.8/1]? Photometric metallicity from
Xu+ 2022ApJS..258...44X 2022ApJS..258...44X (feh_gaia)
190- 195 F6.3 --- e_feh-Gaia [0.03/15]? feh-Gaia formal error
(fehgaiaerror)
197- 204 F8.6 --- EBV [0.0006/0.5] Value of E(B-V)SFD (ebv)
206- 208 F3.1 --- Type [0/1]? Source type (1=giant) (type) (1)
210- 216 F7.4 mag NUVmag [15/22.1] GALEX NUV calibrated
magnitude in AB system (NUVmag)
218- 223 F6.4 mag e_NUVmag [0.003/0.2] Uncertainty on NUVmag
(e_NUVmag)
225- 232 F8.6 mag BP-RP0 [0.49/1.51] Intrinsic BP-RP color
after color correction (BP_RP0)
234- 242 F9.6 mag NUV-BP0 [-0.31/10.8] Intrinsic NUV-BP color
after color correction (NUV_BP0)
244- 249 F6.3 --- feh-GALEXold [-5/1] Photometric metallicity derived
from the previous model without
consideration of MG (fehGALEXold)
251- 256 F6.3 --- feh-GALEX [-4.5/1] Photometric metallicity
derived from the new model with
consideration of MG (feh_GALEX)
258- 266 F9.6 mag GMag [-7.9/14]? Absolute G-band magnitude
(M_G) (2)
268 I1 --- Flag [0/1]? Quality flag (0=reliable)
(flag) (3)
270- 278 F9.3 pc rpgeo [12.7/24854] Median of the
photogeometric distance posterior
(rmedphotogeo) from
Bailer-Jones+ 2021, I/352 (rpgeo)
280- 288 F9.3 pc b_rpgeo [12.7/18555] 16th percentile of the
photogeometric distance posterior
(rlophotogeo) from
Bailer-Jones+ 2021, I/352
290- 298 F9.3 pc B_rpgeo [12.7/33862] 84th percentile of the
photogeometric distance posterior
(rupphotogeo) from
Bailer-Jones+ 2021, I/352
300- 307 F8.2 km.s-1 RV [-755/801]? Radial velocity (rv)
309- 316 F8.2 km.s-1 e_RV [0/9999]? RV uncertainty (e_rv)
318- 327 A10 --- r_RV Flag on RV (flag_rv) (4)
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Note (1): Flag to classify stars (Xu+ 2022ApJS..258...44X 2022ApJS..258...44X) as follows:
0.0 = dwarfs
1.0 = giant (513,777 sources)
Note (2): Absolute magnitude of the G band, calculated by
MG=G-10-5*log(1/plx-cor)-RG*E(B-V)
Note (3): Quality flag as follows:
1 = stars outside the limits where we consider the feh-GALEX values
to be reliable (3727 occurrences)
0 = the stars are within the limits, and considered reliable
Note (4): Flag to indicate the source of radial velocity, which takes the
values GALAH (DR3+), APOGEE (DR17), Gaia (DR3), LAMOST_MRS (DR9),
LAMOST_LRS (DR9), SEGUE (DR16).
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History:
FITS file downloaded from: http://nadc.china-vo.org/res/r101366/
References:
Yuan et al. Paper I. 2015ApJ...799..134Y 2015ApJ...799..134Y
Yuan et al. Paper II. 2015ApJ...799..135Y 2015ApJ...799..135Y
Yuan et al. Paper III. 2015ApJ...803...13Y 2015ApJ...803...13Y
Zhang et al. Paper IV. 2021RAA....21..319Z 2021RAA....21..319Z
Xu et al. Paper V. 2022ApJS..258...44X 2022ApJS..258...44X
Xu et al. Paper VI. 2022ApJS..263...29X 2022ApJS..263...29X
Lu et al. Paper VII. 2024ApJS..271...26L 2024ApJS..271...26L This catalog
(End) Emmanuelle Perret [CDS] 29-Apr-2024