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J/A+A/604/A108          UniDAM results                            (Mints+, 2017)

A Unified tool to estimate Distances, Ages and Masses (UniDAM) from spectrophotometric data. Mints A., Hekker S. <Astron. Astrophys. 604, A108 (2017)> =2017A&A...604A.108M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, ages ; Stars, distances ; Spectrophotometry Keywords: stars: distances - Galaxy: stellar content - stars: fundamental parameters Abstract: Galactic archaeology, the study of the formation and evolution of the Milky Way by reconstructing its past from its current constituents, requires precise and accurate knowledge of stellar parameters for as many stars as possible. To achieve this, a number of large spectroscopic surveys have been undertaken and are still ongoing. So far consortia carrying out the different spectroscopic surveys have used different tools to determine stellar parameters of stars from their derived effective temperatures, surface gravities, and metallicities; the parameters can be combined with photometric, astrometric, interferometric, or asteroseismic information. Here we aim to homogenise the stellar characterisation by applying a unified tool to a large set of publicly available spectrophotometric data. We used spectroscopic data from a variety of large surveys combined with infrared photometry from 2MASS and AllWISE and compared these in a Bayesian manner with PARSEC isochrones to derive probability density functions (PDFs) for stellar masses, ages, and distances. We treated PDFs of pre-helium-core burning, helium-core burning, and post helium-core burning solutions as well as different peaks in multimodal PDFs (i.e. each unimodal sub-PDF) of the different evolutionary phases separately. For over 2.5 million stars we report mass, age, and distance estimates for each evolutionary phase and unimodal sub-PDF. We report Gaussian, skewed, Gaussian, truncated Gaussian, modified truncated exponential distribution or truncated Student's t-distribution functions to represent each sub-PDF, allowing us to reconstruct detailed PDFs. Comparisons with stellar parameter estimates from the literature show good agreement within uncertainties. We present UniDAM, the unified tool applicable to spectrophotometric data of different surveys, to obtain a homogenised set of stellar parameters. Description: Estimates of distances, ages, masses, extinctions and parallaxes are presented for over 2.5 million stars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file unidam.dat 1015 3847557 Parameters for the main catalogue (UniDAM) apogee12.dat 1015 180703 Parameters for APOGEE DR12 (APOGEE_dr12) apokas14.dat 1015 3626 Parameters for APOKASC (APOKASC_2014) rave_dr5.dat 1015 851808 Parameters for RAVE DR5 (RAVE_DR5)
See also: III/279 : RAVE 5th data release (Kunder+, 2017) Byte-by-byte Description of file: *.dat
Bytes Format Units Label Explanations
1- 18 A18 --- Survey Input survey designation (survey) 20- 64 A45 --- ID Unique ID of the star from the input data (id) 66- 72 F7.3 deg GLON Galactic longitude (l) 74- 83 E10.3 deg GLAT Galactic latitude (b) 85- 91 F7.3 deg RAdeg Right Ascension J2000.0 (raj2000) 93-100 F8.4 deg DEdeg Declination J2000.0 (dej2000) 102 I1 --- USPDFPri [0/7] Priority order of a given USPDF (starting from 0) (uspdf_priority) 103-109 I7 --- USPDFpts Number of models used for UPSDF (uspdf_points) 111 I1 --- Stage [1/3] Stage number (I, II or III) (stage) (1) 113-117 F5.3 --- USPDFW [0.030/1.000] Weight of a given USPDF (uspdf_weight) 119 I1 --- TUSPDF [1/8] Number of USPDF with weight >0.03 (total_uspdfs) 121 A1 --- Qual Quality flag (quality) (2) 123-132 E10.3 --- Pbest [0/1] Probability for a best-fitting model (p_best) 134-143 E10.3 --- Psed [0/1] p-value from chi-squared SED fit (p_sed) 145-150 F6.3 [yr] logAgeMean Mean value for logarithm of age (ageMean) 152-161 E10.3 [yr] e_logAgeMean Variance for logarithm of age (age_err) 163-168 F6.3 [yr] logAgeMode Mode value for logarithm of age (ageMode) 170-175 F6.3 [yr] logAgeMed Median value for logarithm of age (ageMed) 177-182 F6.3 [yr] e1_logAge Lower boundary of 1-sigma range for logarithm of age (agelow1sigma) 184-189 F6.3 [yr] E1_logAge Upper boundary of 1-sigma range for logarithm of age (ageup1sigma) 191-196 F6.3 [yr] e3_logAge Lower boundary of 3-sigma range for logarithm of age (agelow3sigma) 198-203 F6.3 [yr] E3_logAge Upper boundary of 3-sigma range for logarithm of age (ageup3sigma) 205 A1 [yr] logAgeFit Fitting function for logarithm of age (ageFit) (3) 207-215 F9.3 [yr] logAgePar1 First fit parameter for logarithm of age (agepar1) (4) 217-226 E10.3 [yr] logAgePar2 First fit parameter for logarithm of age (agepar2) (4) 228-237 E10.3 [yr] logAgePar3 First fit parameter for logarithm of age (agepar3) (4) 239-244 F6.3 [yr] logAgePar4 First fit parameter for logarithm of age (agepar4) (4) 246-251 F6.3 [yr] logAgePar5 First fit parameter for logarithm of age (agepar5) (4) 253-258 F6.3 Msun MassMean Mean value for mass (mass_mean) 260-269 E10.3 Msun e_MassMean Variance for mass (mass_err) 271-276 F6.3 Msun MassMode Mode value for mass (mass_mode) 278-283 F6.3 Msun MassMed Median value for mass (mass_median) 285-290 F6.3 Msun e1_Mass Lower boundary of 1-sigma range for mass (masslow1sigma) 292-297 F6.3 Msun E1_Mass Upper boundary of 1-sigma range for mass (massup1sigma) 299-304 F6.3 Msun e3_Mass Lower boundary of 3-sigma range for mass (masslow3sigma) 306-311 F6.3 Msun E3_Mass Upper boundary of 3-sigma range for mass (massup3sigma) 313 A1 Msun MassFit Fitting function for mass (mass_fit) (3) 315-324 E10.3 Msun MassPar1 First fit parameter for mass (masspar1) (4) 326-335 E10.3 Msun MassPar2 First fit parameter for mass (masspar2) (4) 337-346 E10.3 Msun MassPar3 First fit parameter for mass (masspar3) (4) 348-353 F6.3 Msun MassPar4 First fit parameter for mass (masspar4) (4) 355-360 F6.3 Msun MassPar5 First fit parameter for mass (masspar5) (4) 362-369 F8.4 mag DMMean Mean value for distance modulus (distancemodulusmean) 371-375 F5.3 mag e_DMMean Variance for distance modulus (distancemoduluserr) 377-383 F7.3 mag DMMode Mode value for distance modulus (distancemodulusmode) 385-391 F7.3 mag DMMed Median value for distance modulus (distancemodulusmedian) 393-399 F7.3 mag e1_DM Lower boundary of 1-sigma range for distance modulus (distancemoduluslow_1sigma) 401-407 F7.3 mag E1_DM Upper boundary of 1-sigma range for distance modulus (distancemodulusup_1sigma) 409-415 F7.3 mag e3_DM Lower boundary of 3-sigma range for distance modulus (distancemoduluslow_3sigma) 417-423 F7.3 mag E3_DM Upper boundary of 3-sigma range for distance modulus (distancemodulusup_3sigma) 425 A1 mag DMFit Fitting function for distance modulus (distance_modulusFit) (3) 427-433 F7.3 mag DMPar1 First fit parameter for distance modulus (distancemoduluspar_1) (4) 435-439 F5.3 mag DMPar2 First fit parameter for distance modulus (distancemoduluspar_2) (4) 441-450 E10.3 mag DMPar3 First fit parameter for distance modulus (distancemoduluspar_3) (4) 452-458 F7.3 mag DMPar4 First fit parameter for distance modulus (distancemoduluspar_4) (4) 460-466 F7.3 mag DMPar5 First fit parameter for distance modulus (distancemoduluspar_5) (4) 468-477 E10.3 mag ExtMean Mean value for extinction in 2MASS K-band (extinction_mean) 479-483 F5.3 mag e_ExtMean Variance for extinction in 2MASS K-band (extinction_err) 485-490 F6.3 mag ExtMode Mode value for extinction in 2MASS K-band (extinction_mode) 492-497 F6.3 mag ExtMed Median value for extinction in 2MASS K-band (extinction_median) 499-508 E10.3 mag e1_Ext Lower boundary of 1-sigma range for extinction in 2MASS K-band (extinctionlow1sigma) 510-515 F6.3 mag E1_Ext Upper boundary of 1-sigma range for extinction in 2MASS K-band (extinctionup1sigma) 517-526 E10.3 mag e3_Ext Lower boundary of 3-sigma range for extinction in 2MASS K-band (extinctionlow3sigma) 528-533 F6.3 mag E3_Ext Upper boundary of 3-sigma range for extinction in 2MASS K-band (extinctionup3sigma) 535 A1 mag ExtFit Fitting function for extinction in 2MASS K-band (extinction_fit) (3) 537-544 F8.4 mag ExtPar1 First fit parameter for extinction in 2MASS K-band (extinctionpar1) (4) 546-550 F5.3 mag ExtPar2 First fit parameter for extinction in 2MASS K-band (extinctionpar2) (4) 552-561 E10.3 mag ExtPar3 First fit parameter for extinction in 2MASS K-band (extinctionpar3) (4) 563-572 E10.3 mag ExtPar4 First fit parameter for extinction in 2MASS K-band (extinctionpar4) (4) 574-579 F6.3 mag ExtPar5 First fit parameter for extinction in 2MASS K-band (extinctionpar5) (4) 581-591 F11.3 kpc DistMean Mean value for distance (Distmean) 593-602 E10.3 kpc e_DistMean Variance for distance (distance_err) 604-614 F11.3 kpc DistMod Mode value for distance (distanceMode) 616-626 F11.3 kpc DistMed Median value for distance (distanceMed) 628-638 F11.3 kpc e1_Dist Lower boundary of 1-sigma range for distance (distancelow1sigma) 640-650 F11.3 kpc E1_Dist Upper boundary of 1-sigma range for distance (distanceup1sigma) 652-661 E10.3 kpc e3_Dist Lower boundary of 3-sigma range for distance (distancelow3sigma) 663-672 E10.3 kpc E3_Dist Upper boundary of 3-sigma range for distance (distanceup3sigma) 674 A1 kpc DistFit Fitting function for distance (distanceFit) (3) 676-685 E10.3 kpc DistPar1 First fit parameter for distance (Distpar_1) (4) 687-696 E10.3 kpc DistPar2 First fit parameter for distance (Distpar_2) (4) 698-707 E10.3 kpc DistPar3 First fit parameter for distance (Distpar_3) (4) 709-718 E10.3 kpc DistPar4 First fit parameter for distance (Distpar_4) (4) 720-730 F11.3 kpc DistPar5 First fit parameter for distance (Distpar_5) (4) 732-741 E10.3 mas plxMean Mean value for parallax (plx_mean) 743-752 E10.3 mas e_plxMean Variance for parallax (parallax_err) 754-763 E10.3 mas plxMode Mode value for parallax (parallax_mode) 765-774 E10.3 mas plxMed Median value for parallax (parallax_median) 776-785 E10.3 mas e1_plx Lower boundary of 1-sigma range for parallax (parallaxlow1sigma) 787-796 E10.3 mas E1_plx Upper boundary of 1-sigma range for parallax (parallaxup1sigma) 798-807 E10.3 mas e3_plx Lower boundary of 3-sigma range for parallax (parallaxlow3sigma) 809-818 E10.3 mas E3_plx Upper boundary of 3-sigma range for parallax (parallaxup3sigma) 820 A1 mas plxFit Fitting function for parallax (parallax_fit) (3) 822-831 E10.3 mas plxPar1 First fit parameter for parallax (plxpar1) (4) 833-842 E10.3 mas plxPar2 First fit parameter for parallax (plxpar2) (4) 844-853 E10.3 mas plxPar3 First fit parameter for parallax (plxpar3) (4) 855-864 E10.3 mas plxPar4 First fit parameter for parallax (plxpar4) (4) 866-875 E10.3 mas plxPar5 First fit parameter for parallax (plxpar5) (4) 877-886 E10.3 --- DM-AgeSlope Slope of the distance modulus-log(Age) relation (dmageslope) 888-897 E10.3 --- DM-AgeInter Intercept of the distance modulus-log(Age) relation (dmageintercept) 899-908 E10.3 --- DM-AgeSct Scatter of the distance modulus-log(Age) relation (dmagescatter) 910-919 E10.3 --- DM-AgeMad MAD of the distance modulus-log(Age) relation (dmagemad) 921-930 E10.3 --- Age-DMSlope Slope of the log(Age)-distance modulus relation (agedmslope) 932-941 E10.3 --- Age-DMInter Intercept of the log(Age)-distance modulus relation (agedmintercept) 943-948 F6.4 --- Age-DMSct Scatter of the log(Age)-distance modulus relation (agedmscatter) 950-959 E10.3 --- Age-DMMad MAD of the log(Age)-distance modulus relation (agedmmad) 961-970 E10.3 --- DM-MassSlope Slope of the distance modulus-log(Mass) relation (dmmassslope) 972-981 E10.3 --- DM-MassInter Intercept of the distance modulus-log(Mass) relation (dmmassintercept) 983-992 E10.3 --- DM-MassSct Scatter of the distance modulus-log(Mass) relation (dmmassscatter) 994-1003 E10.3 --- DM-MassMad MAD of the distance modulus-log(Mass) relation (dmmassmad) 1005-1009 F5.3 mag DM-smooth [0/7] Smoothing parameter for PDF for distance modulus (distancemodulussmooth) (5) 1011-1015 F5.3 mag Ext-smooth [0/7] Smoothing parameter for PDF for extinction in 2MASS k-band (extinction_smooth) (5)
Note (1): Evolutionary stage as follows: I = Pre-core-helium burning; II = Core-helium burning stars; III = Asymptotic giant branch stars (post-core-helium burning). Note (2): Quality flag (see section 6.1) as follows: 1 = single PDF A = highest-weight USPDF has power of 0.9 or more B = 1st and 2nd priority USPDFs together have power of 0.9 or more C = 1st, 2nd, and 3rd priority USPDFs together have power of 0.9 or more D = 1st, 2nd, and 3rd priority USPDFs together have power of less than 0.9 L = low power USPDF (between 0.03 and 0.1) E = USPDF has psed<0.1 (possibly bad photometry) X = highest weight USPDF has pbest<0.1 (likely off the model grid) N = USPDF has less than 10 models (unreliable result) Note (3): A character indicating which fitting function was chosen as follows: G = Gaussian S = Skewed Gaussian T = Truncated Gaussian L = Modified truncated exponential distribution (MTED) P = Truncated Student's t-distribution E = Fit failed for all five above functions N = There was not enough data for a fit Note (4): *Par* columns are parameters for a chosen fitting function. The first two values are location and shape for the chosen best fitting function. For a Gaussian function, by definition, location parameter is equal to the mean value and shape parameter to the variance. If the chosen function is a skewed Gaussian then the third value is the skew value. If the chosen function is a truncated Gaussian or MTED, then third and fourth values are lower and upper limits. If the chosen function is Student's t-distribution then the third value is the number of degrees of freedom and the fourth and fifth values are lower and upper limits. Note (5): Gaussian smoothing coefficients for distance modulus and extinction PDFs, see section 4.1
Acknowledgements: Alexey Mints, mints(at)mps.mpg.de, Saskia Hekker
(End) Alexey Mints [MPS, Germany], Patricia Vannier [CDS] 12-May-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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