J/A+A/692/A243 New stellar age estimates using SPInS (Casamiquela+, 2024)
New stellar age estimates using SPInS based on Gaia DR3 photometry and
LAMOST DR8 abundances.
Casamiquela L., Reese D.R., Lebreton Y., Haywood M., Di Matteo P.,
Anders F., Jash R., Katz D., Cerqui V., Boin T., Kordopatis G.
<Astron. Astrophys. 692, A243 (2024)>
=2024A&A...692A.243C 2024A&A...692A.243C (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Photometry ; Optical ; Abundances ;
Effective temperatures ; Stars, masses
Keywords: Galaxy: evolution - Galaxy: general - solar neighborhood
Abstract:
Reliable stellar age estimates are fundamental for testing several
problems in modern astrophysics, in particular since they set the
timescales of Galactic dynamical and chemical evolution.
In this study, we determine ages using only Gaia DR3 photometry and
parallaxes, in combination with interstellar extinction maps, and
spectroscopic metallicities and abundances from the latest data
release (DR8) of the LAMOST survey. In contrast with previous age
estimates, we do not use spectroscopic effective temperatures or
surface gravities, and thus we rely on the excellent precision and
accuracy of the Gaia photometry. We use a new version of the publicly
available SPInS code with improved features, including the on-the-fly
computation of the autocorrelation time and the automatic convergence
evaluation. We determine reliable age estimates for 35096 and 243768
sub-giant and main-sequence turn-off stars in the LAMOST DR8 low-
and medium-resolution surveys with typical uncertainties smaller than
10%. In addition, we successfully test our method on more than 4000
stars of 14 well-studied open and globular star clusters covering a
wide range of ages, confirming the reliability of our age and
uncertainty estimates.
Description:
We include here a table containing the SPInS results for the low an
medium resolution surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
mrs.dat 696 35096 Medium resolution sample catalog
lrs.dat 455 243768 Low resolution sample catalog
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See also:
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: mrs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR3 Gaia DR3 source id (source_id)
21- 38 F18.16 mag GMAG Absolute magnitude in G band (MG)
40- 57 F18.16 mag e_GMAG Error in absolute magnitude in G band
(e_MG)
59- 76 F18.16 mag GBP-GRP0 GBP-GRP color extinction corrected
(GBPGRP0)
78- 95 F18.16 mag e_GBP-GRP0 Error in GBP-GRP color (eGBPGRP_0)
97-114 F18.16 mag AG Interstellar absorption (AG)
116-133 F18.16 mag E(GBP-GRP) Reddening in GBP-GRP (E(GBP-GRP))
135-156 F22.16 pc Xpc0 X galactic cartesian coordinate (Xpc0) (G1)
158-178 F21.16 pc Ypc0 Y galactic cartesian coordinate (Ypc0) (G1)
180-199 F20.15 pc Zpc0 Z galactic cartesian coordinate (Zpc0) (G1)
201-207 F7.2 K Teffl Effective temperature taken from
LAMOSTDR8-MRS obtained by LASP
(tefflaspdr8MRS)
209-213 F5.2 K e_Teffl Error in effective temperature taken from
LAMOSTDR8-MRS obtained by LASP
(tefflasperr_dr8MRS)
215-219 F5.3 [cm/s2] loggl Surface gravity taken from LAMOSTDR8-MRS
obtained by LASP (logglaspdr8MRS)
221-225 F5.3 [cm/s2] e_loggl Error in surface gravity taken from
LAMOSTDR8-MRS obtained by LASP
(logglasperr_dr8MRS)
227-232 F6.3 [-] [Fe/H]l Fe abundance taken from LAMOSTDR8-MRS
obtained by LASP (fehlaspdr8MRS)
234-238 F5.3 [-] e_[Fe/H]l Error in Fe abundance taken from
LAMOSTDR8-MRS obtained by LASP
(fehlasperr_dr8MRS)
240-245 F6.3 --- [alpha/M]l Abundance [alpha/M] taken from
LAMOSTDR8-MRS obtained by LASP
(alphamlasp_dr8MRS)
247-254 F8.6 --- e_[alpha/M]l Error in [alpha/M] taken from
LAMOSTDR8-MRS obtained by LASP
(alphamlasperrdr8MRS)
256-263 F8.2 K Teffc ?=-9999 Effective temperature taken from
LAMOSTDR8-MRS obtained by CNN
(teffcnndr8MRS)
265-273 F9.3 K e_Teffc ?=-9999 Surface gravity taken from
LAMOSTDR8-MRS obtained by CNN
(loggcnndr8MRS)
275-283 F9.3 [-] [Fe/H]c ?=-9999 Fe abundance taken from
LAMOSTDR8-MRS obtained by CNN
(fehcnndr8MRS)
285-293 F9.3 --- [alpha/M]c ?=-9999 [alpha/M] taken from LAMOSTDR8-MRS
obtained by CNN (alphamcnn_dr8MRS)
295-316 E22.17 [Msun] logMass0l Median of the logarithm of the initial mass
of the star obtained by SPInS using LASP
abundances (logMass0SPInS50_lasp)
318-339 E22.17 [Msun] b_logMass0l 16th percentile of the logarithm of the
initial mass of the star obtained by SPInS
using LASP abundances
(logMass0SPInS16_lasp)
341-362 E22.17 [Msun] B_logMass0l 84th percentile of the logarithm of the
initial mass of the star obtained by SPInS
using LASP abundances
(logMass0SPInS84_lasp)
364-384 E21.16 --- MoHl Median of the overall metallicity of the
star obtained by SPInS using LASP
abundances (MoHSPInS50_lasp)
386-407 E22.17 --- b_MoHl 16th percentile of the overall metallicity
of the star obtained by SPInS using LASP
abundances (MoHSPInS16_lasp)
409-430 E22.17 --- B_MoHl 84th percentile of the overall metallicity
of the star obtained by SPInS using LASP
abundances (MoHSPInS84_lasp)
432-451 F20.14 Myr Agel Median of the Age of the star obtained by
SPInS using LASP abundances
(AgeSPInS50_lasp)
453-473 F21.15 Myr b_Agel 16th percentile of the Age of the star
obtained by SPInS using LASP abundances
(AgeSPInS16_lasp)
475-494 F20.14 Myr B_Agel 84th percentile of the Age of the star
obtained by SPInS using LASP abundances
(AgeSPInS84_lasp)
496-517 E22.19 [Msun] logMass0c ? Median of the logarithm of the initial
mass of the star obtained by SPInS using
CNN abundances (logMass0SPInS50_cnn)
519-540 E22.19 [Msun] b_logMass0c ? 16th percentile of the logarithm of the
initial mass of the star obtained by SPInS
using CNN abundances
(logMass0SPInS16_cnn)
542-563 E22.19 [Msun] B_logMass0c ? 84th percentile of the logarithm of the
initial mass of the star obtained by SPInS
using CNN abundances
(logMass0SPInS84_cnn)
565-586 E22.19 --- MoHc ? Median of the overall metallicity of the
star obtained by SPInS using CNN
abundances (MoHSPInS50_cnn)
588-609 E22.19 --- b_MoHc ? 16th percentile of the overall
metallicity of the star obtained by SPInS
using CNN abundances (MoHSPInS16_cnn)
611-632 E22.19 --- B_MoHc ? 84th percentile of the overall
metallicity of the star obtained by SPInS
using CNN abundances (MoHSPInS84_cnn)
634-653 F20.14 Myr Agec ? Median of the Age of the star obtained by
SPInS using CNN abundances
(AgeSPInS50_cnn)
655-675 F21.15 Myr b_Agec ? 16th percentile of the Age of the star
obtained by SPInS using CNN abundances
(AgeSPInS16_cnn)
677-696 F20.14 Myr B_Agec ? 84th percentile of the Age of the star
obtained by SPInS using CNN abundances
(AgeSPInS84_cnn)
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Byte-by-byte Description of file: lrs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR3 Gaia DR3 source id (source_id)
21- 38 F18.16 mag GMAG Absolute magnitude in G band (MG)
40- 57 F18.16 mag e_GMAG Error in absolute magnitude in G band
(e_MG)
59- 76 F18.16 mag GBP-GRP0 GBP-GRP color extinction corrected
(GBPGRP0)
78- 95 F18.16 mag e_GBP-GRP0 Error in GBP-GRP color (eGBPGRP_0)
97-114 F18.16 mag AG Interstellar absorption (AG)
116-133 F18.16 mag E(GBP-GRP) Reddening in GBP-GRP (E(GBP-GRP))
135-153 E19.16 pc Xpc0 X galactic cartesian coordinate (Xpc0) (G1)
155-173 E19.16 pc Ypc0 Y galactic cartesian coordinate (Ypc0) (G1)
175-195 F21.15 pc Zpc0 Z galactic cartesian coordinate (Zpc0) (G1)
197-203 F7.2 K Teff Effective temperature taken from
LAMOSTDR8-LRS (teff_dr8LRS)
205-209 F5.2 K e_Teff Error in effective temperature taken from
LAMOSTDR8-LRS (tefferrdr8LRS)
211-215 F5.3 [cm/s2] logg Surface gravity taken from LAMOSTDR8-LRS
(logg_dr8LRS)
217-221 F5.3 [cm/s2] e_logg Error in surface gravity taken from
LAMOSTDR8-LRS (loggerrdr8LRS)
223-228 F6.3 [-] [Fe/H] Fe abundance taken from LAMOSTDR8-LRS
(feh_dr8LRS)
230-234 F5.3 [-] e_[Fe/H] Error in Fe abundance taken from
LAMOSTDR8-LRS (feherrdr8LRS)
236-244 E9.6 --- [alpha/M] Abundance [alpha/M] taken from
LAMOSTDR8-LRS (alphamdr8LRS)
246-253 F8.6 --- e_[alpha/M] Error in [alpha/M] taken from
LAMOSTDR8-LRS (alphamerr_dr8LRS)
255-276 E22.17 [Msun] logMass0 Median of the logarithm of the initial mass
of the star obtained by SPInS
(logMass0SPInS50)
278-299 E22.17 [Msun] b_logMass0 16th percentile of the logarithm of the
initial mass of the star obtained by
SPInS (logMass0SPInS16)
301-322 E22.17 [Msun] B_logMass0 84th percentile of the logarithm of the
initial mass of the star obtained by
SPInS (logMass0SPInS84)
324-345 E22.17 [-] MoH Median of the overall metallicity of the
star obtained by SPInS (MoHSPInS50)
347-368 E22.17 [-] b_MoH 16th percentile of the overall metallicity
of the star obtained by SPInS
(MoHSPInS16)
370-391 E22.17 [-] B_MoH 84th percentile of the overall metallicity
of the star obtained by SPInS
(MoHSPInS84)
393-412 F20.14 Myr Age Median of the Age of the star obtained
by SPInS (AgeSPInS50)
414-434 F21.15 Myr b_Age 16th percentile of the Age of the star
obtained by SPInS (AgeSPInS16)
436-455 F20.14 Myr B_Age 84th percentile of the Age of the star
obtained by SPInS (AgeSPInS84)
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Global notes:
Note (G1): The Sun is at (0,0,0) and left-handed Galactocentric coordinate
frame .
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Acknowledgements:
Laia Casamiquela, laia.casamiquela(at)obspm.fr
(End) Patricia Vannier [CDS] 13-Nov-2024