I/354 StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)
Photo-astrometric distances, extinctions, and astrophysical parameters for
Gaia EDR3 stars brighter than G = 18.5 .
Anders F., Khalatyan A., Queiroz A.B.A., Chiappini C., Ardevol J.,
Casamiquela L., Figueras F., Jimenez-Arranz O., Jordi C., Monguio M.,
Romero-Gomez M., Altamirano D., Antoja T., Assaad R., Cantat-Gaudin T.,
Castro-Ginard A., Enke H., Girardi L., Guiglion G., Khan S., Luri X.,
Miglio A., Minchev I., Ramos P., Santiago B.X., Steinmetz M.
<Astron. Astrophys., 658, A91 (2022)>
=2022yCat.1354....0A 2022yCat.1354....0A
=2022A&A...658A..91A 2022A&A...658A..91A
ADC_Keywords: Surveys ; Stars, distances ; Extinction
Keywords: stars: distances - stars: fundamental parameters -
Galaxy: general - Galaxy: stellar content - Galaxy: structure
Abstract:
We present a catalogue of 362 million stellar parameters, distances,
and extinctions derived from Gaia's Early Data Release (EDR3)
cross-matched with the photometric catalogues of Pan-STARRS1,
SkyMapper, 2MASS, and AllWISE. The higher precision of the Gaia EDR3
data, combined with the broad wavelength coverage of the additional
photometric surveys and the new stellar-density priors of the
StarHorse code, allows us to substantially improve the accuracy and
precision over previous photo-astrometric stellarparameter estimates.
At magnitude G=14 (17), our typical precisions amount to 3% (15%) in
distance, 0.13mag (0.15mag) in V-band extinction, and 140K (180K)
in effective temperature. Our results are validated by comparisons
with open clusters, as well as with asteroseismic and spectroscopic
measurements, indicating systematic errors smaller than the nominal
uncertainties for the vast majority of objects. We also provide
distance- and extinction-corrected colour-magnitude diagrams,
extinction maps, and extensive stellar density maps that reveal
detailed substructures in the Milky Way and beyond. The new density
maps now probe a much greater volume, extending to regions beyond the
Galactic bar and to Local Group galaxies, with a larger total number
density. We publish our results through an ADQL query interface
(gaia.aip.de) as well as via tables containing approximations of the
full posterior distributions. Our multi-wavelength approach and the
deep magnitude limit render our results useful also beyond the next
Gaia release, DR3.
Description:
We present a catalogue of 362 million stellar parameters, distances,
and extinctions based on Gaia EDR3, Pan-STARRS1, SkyMapper, 2MASS, and
AllWISE. The new data and computational updates in our code serve to
substantially improve the accuracy and precision over previous
photo-astrometric stellarparameter estimates (typically by a factor of
2 compared to Anders et al., 2019A&A...628A..94A 2019A&A...628A..94A, Cat. I/349).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
starhorse2021.sam 432 1000 First 1000 lines as an example, Starhorse 2021
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
Byte-by-byte Description of file: starhorse2021.sam
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Bytes Format Units Label Explanations
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1- 19 I19 --- Source Gaia EDR3 unique source identifier (source_id)
21- 34 F14.10 deg RAdeg Barycentric right ascension of the source
(ICRS) at Ep=2016.0 (ra) (1)
36- 49 F14.10 deg DEdeg Barycentric declination of the source
(ICRS) at Ep=2016.0 (dec) (1)
51- 59 F9.6 Msun mass16 StarHorse stellar mass 16th percentile
61- 69 F9.6 Msun mass50 StarHorse stellar mass 50th percentile
71- 79 F9.6 Msun mass84 StarHorse stellar mass 84th percentile
81- 88 F8.2 K teff16 StarHorse effective temperature
16th percentile
90- 97 F8.2 K teff50 StarHorse effective temperature
50th percentile
99-106 F8.2 K teff84 StarHorse effective temperature
84th percentile
108-116 F9.6 [cm/s2] logg16 StarHorse surface gravity 16th percentile
118-126 F9.6 [cm/s2] logg50 StarHorse surface gravity 50th percentile
128-136 F9.6 [cm/s2] logg84 StarHorse surface gravity 84th percentile
138-146 F9.6 [-] met16 StarHorse metallicity 16th percentile
148-156 F9.6 [-] met50 StarHorse metallicity 50th percentile
158-166 F9.6 [-] met84 StarHorse metallicity 84th percentile
168-178 F11.6 kpc dist05 StarHorse distance 5th percentile
180-190 F11.6 kpc dist16 StarHorse distance 16th percentile
192-202 F11.6 kpc dist50 StarHorse distance 50th percentile
204-214 F11.6 kpc dist84 StarHorse distance 84th percentile
216-226 F11.6 kpc dist95 StarHorse distance 95th percentile
228-236 F9.6 mag AV05 StarHorse line-of-sight extinction at
λ=5420A 5th percentile (av05)
238-246 F9.6 mag AV16 StarHorse line-of-sight extinction at
λ=5420A 16th percentile (av16)
248-256 F9.6 mag AV50 StarHorse line-of-sight extinction at
λ=5420A 50th percentile (av50)
258-266 F9.6 mag AV84 StarHorse line-of-sight extinction at
λ=5420A 84th percentile (av84)
268-276 F9.6 mag AV95 StarHorse line-of-sight extinction at
λ=5420A 95th percentile (av95)
278-285 F8.6 --- fidelity Gaia EDR3 astrometric fidelity flag
(Rybizki et al., 2021, MNRAS, in prep.)
287-297 F11.6 kpc XGal StarHorse Galactocentric Cartesian X
co-ordinate derived from dist50 and
assuming R0=8.2kpc (xgal)
299-309 F11.6 kpc YGal StarHorse Galactocentric Cartesian Y
co-ordinate derived from dist50 and
assuming R0=8.2kpc (ygal)
311-321 F11.6 kpc ZGal StarHorse Galactocentric Cartesian Z
co-ordinate derived from dist50 and
assuming R0=8.2kpc (zgal)
323-333 F11.6 kpc RGal StarHorse Galactocentric planar distance
derived from XGal and YGal (rgal)
335-357 A23 --- FlagPhoto StarHorse photometry input flag
(sh_photoflag) (2)
359-362 I4 --- FlagOut StarHorse output flag (sh_outflag) (3)
364-382 F19.10 --- BP/RPCorr ? Gaia EDR3 photometric BP/RP flux excess
factor (corrected following
Riello et al., 2021A&A...649A...3R 2021A&A...649A...3R)
(bprpexcess_corr)
384-392 F9.6 mag AG50 StarHorse line-of-sight extinction in the
G band derived from AV50 and teff50 (ag50)
394-402 F9.6 mag ABP50 StarHorse line-of-sight extinction in the
GBP band 50th percentile derived from
AV50 and teff50 (abp50)
404-412 F9.6 mag ARP50 StarHorse line-of-sight extinction in the
GRP band 50th percentile derived from
AV50 and teff50 (arp50)
414-422 F9.6 mag GMAG0 StarHorse absolute magnitude derived from
photgmean_mag (recalibrated)
dist50 and AG50 (mg0)
424-432 F9.6 mag BP-RP0 ? StarHorse dereddened colour (GBP-GRP)0
derived from photbpmean_mag,
photrpmean_mag ABP50 and ARP50 (bprp0)
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Note (1): Positions from Gaia EDR3 with 10-10deg precision, added by CDS.
Note (2): sh_photoflag. For example, if only Gaia EDR3G;GRP and 2MASS HKs
magnitudes were available, the flag reads GRPHKs.
PS1 and SkyMapper photometry are separated by a slash (/) in the sh_photoflag:
for example, the flag Gg/riW1W2 means that the object in question has good
Gaia G, PS1 g, SkyMapper ri, and AllWISE W1W2 measurements, while G/g means
that the object has only Gaia G and SkyMapper g.
Note (3): sh_outflag: consists of several digits that inform about the
fidelity of the StarHorse output parameters.
digit 1: [0/1] flags low number of consistent models
For some targets, the number of stellar models in our model grid
found to be 3-consistent with the data is low, indicating either very
precise results or (more likely) some tension in the input data.We
consider a results unproblematic if the number of models is greater
than 30, and apply a (strong) warning flag if this number is between
10 and 30 (below 10): IF nummodels > 30 THEN 0 ELIF nummodels > 10
THEN 1 ELSE 2.
digit 2: [0/1] flags negative extinction.
Significantly negative extinctions should be treated with care:
IF AV95 > 0 THEN 0 ELSE 1.
digit 3: [0/1] warns about very large uncertainties.
Large uncertainties are not problematic per se, but the corresponding
median values are not usually very informative, which is why we
provide this flag to be able to filter out very uncertain results
quickly. The definition is as follows:
IF 0.5 * (dist84 - dist16)/dist50 > 1 OR 0.5 * (AV84 - AV16) > 1
OR 0.5 * (teff84 - teff16) > 1000 OR 0.5 * (logg84 - logg16) > 1
OR 0.5 * (met84 - met16) > 1 OR 0.5 * (mass84 - mass16)/mass50 > 1 THEN 1
ELSE 0.
digit 4: [0/1] flags very small uncertainties.
Very small
posterior uncertainties are most likely underestimated and probably
indicate poor convergence. These results should also be used with
care. The definition is as follows:
IF 0.5 * (dist84 - dist16)/dist50 < 0.001 OR 0.5 * (av84 - av16) < 0.01
OR 0.5 * (teff84 - teff16) < 20, OR 0.5 * (logg84 - logg16) < 0.01
OR 0.5 * (met84 - met16) < 0.01 OR 0.5 * (mass84 - mass16)/mass50 < 0.01
THEN 1 ELSE 0.
Unproblematic results from the point of view of StarHorse can thus be
filtered by requiring sh_outflag≡"0000".
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Acknowledgements:
Friedrich Anders, fanders(at)fqa.ub.edu
Arman Khalatyan, akhalatyan(at)aip.de
(End) Francois-Xavier Pineau, Patricia Vannier [CDS] 10-Jan-2022