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II/354        HIP and TGAS stars reddening and extinction     (Gontcharov+ 2018)

Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars. Verifying reddening and extinction for Gaia DR1 TGAS giants. Gontcharov G.A., Mosenkov A.V. <Mon. Not. R. Astron. Soc. 472, 3805 (2017) and 475, 1121 (2018) > =2018yCat.2354....0G =2017MNRAS.472.3805G +2018MNRAS.475.1121G
ADC_Keywords: Extinction ; Interstellar medium ; Milky Way ; Reddening Keywords: color-magnitude diagram - interstellar medium - Galactic solar neighborhoods - dark clouds - stellar reddening - interstellar extinction - Milky Way Galaxy Abstract: These reddening and interstellar extinction estimates are a result of a series of studies presented in the papers 2009AstL...35..780G, 2010AstL...36..584G, 2012AstL...38...12G, 2012AstL...38...87G, 2017AstL...43..472G and finally 2017MNRAS.472.3805G and 2018MNRAS.475.1121G. The key basis of these estimates is the 3D reddening map of Gontcharov (2017AstL...43..472G, 2017PAZh...43..521G, Cat. J/PAZh/43/521). This map has been tested among eight sources of reddening and extinction estimates for nearly 60,000 Gaia DR1 TGAS main sequence stars younger than 3Gyr with a relative error of the Gaia parallax less than 0.1. The sources are tested in their ability to put the stars among the PARSEC and MIST theoretical isochrones in the Hertzsprung-Russell diagram based on the precise Gaia, Tycho-2, 2MASS and WISE photometry. The 3D reddening map of Gontcharov provides both the minimal number of outliers bluer than any reasonable isochrone and the correct number of stars younger than 3Gyr in agreement with the Besancon Galaxy model. In another test Gaia DR1 TGAS parallaxes, Tycho-2 photometry and reddening/extinction estimates from nine data sources for 38,074 giants within 415pc from the Sun are used to compare their position in the Hertzsprung-Russell diagram with theoretical estimates, which are based on the PARSEC and MIST isochrones and the TRILEGAL model of the Galaxy with its parameters being widely varied. We conclude that, again, the estimates from the 3D reddening map of Gontcharov, including the median reddening E(B-V)=0.06mag at |b|>50°, give the best fit of the empirical and theoretical data with each other. Based on these studies we present here the best up-to-date reddening, extinction and extinction-to-reddening estimates for the Gaia DR1 TGAS and Hipparcos stars within 415pc from the Sun. The accuracy of the E(B-V) estimates is proved to be better than 0.04mag everywhere in this space. Description: These are the reddening, interstellar extinction and extinction-to-reddening ratio estimates interpolated for 730,496 Gaia DR1 TGAS and Hipparcos stars within 415 pc from the Sun based on the 3D reddening map of Gontcharov (J/PAZh/43/521) and 3D extinction-to-reddening (total-to-selective extinction) ratio Rv=Av/E(B-V) map of Gontcharov (J/PAZh/38/15). For 711,237 Gaia DR1 TGAS stars the rMoMW distances from Astraatmadja and Bailer-Jones (2016ApJ...833..119A, Cat. J/ApJ/833/119) are used. For 19,259 Hipparcos stars, not in Gaia DR1 TGAS, the distances as the inversion of Hipparcos (I/311) parallaxes are used. The E(B-V) are calculated from initial E(J-Ks) as E(B-V)=E(J-Ks)*(0.047X3-0.1X2-0.09X+1.74), where X=(BT-VT) (B_T and V_T Tycho-2 bands) following the extinction law. This refined relation supersedes E(B-V)=1.655E(J-Ks) in the original 3D reddening map of Gontcharov. The Rv are interpolated from the 3D map of Rv of Gontcharov (2012AstL...38...12G, 2012PAZh...38...15G, Cat. J/PAZh/38/15). The Av are the product of E(B-V) and Rv. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tgasext.dat 82 711237 E(J-Ks), E(B-V), Rv and Av for Gaia DR1 TGAS stars hipext.dat 62 19259 E(J-Ks), E(B-V), Rv and Av for Hipparcos stars, not in Gaia DR1 TGAS
See also: I/259 : The Tycho-2 Catalogue (Hog+ 2000) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007) I/337 : Gaia DR1 (Gaia Collaboration, 2016) J/PAZh/38/15 : Total-to-selective extinction ratio within 700pc (Gontcharov, 2012) J/PAZh/43/521 : 3D map of reddening and interstellar extinction (Gontcharov, 2017) Byte-by-byte Description of file: tgasext.dat
Bytes Format Units Label Explanations
1- 19 I19 --- Source Source ID (Cat. I/337) 21- 26 I6 --- HIP ? Hipparcos (Cat. I/311) identifier 28- 35 F8.4 deg RAdeg Approximate right ascension (ICRS) at epoch 2015.0 (G1) 37- 44 F8.4 deg DEdeg Approximate declination (ICRS) at epoch 2015.0 (G1) 46- 53 F8.4 deg GLON Approximate Galactic longitude at epoch 2015.0 (G1) 55- 62 F8.4 deg GLAT Approximate Galactic latitude at epoch 2015.0 (G1) 64- 67 F4.2 mag E(J-Ks) [0.00,0.26] E(J-Ks) reddening (G2) 69- 72 F4.2 mag E(B-V) [0.00,0.43] E(B-V) reddening (G3) 74- 77 F4.2 --- Rv [2.01,4.12] Rv total-to-selective extinction ratio (G4) 79- 82 F4.2 mag Av [0.00,1.24] Av interstellar extinction (G5)
Byte-by-byte Description of file: hipext.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP Hipparcos (Cat. I/311) identifier 8- 15 F8.4 deg RAdeg Approximate right ascension (ICRS) at epoch 1991.25 (G6) 17- 24 F8.4 deg DEdeg Approximate declination (ICRS) at epoch 1991.25 (G6) 26- 33 F8.4 deg GLON Approximate Galactic longitude at epoch 1991.25 (G6) 35- 42 F8.4 deg GLAT Approximate Galactic latitude at epoch 1991.25 (G6) 44- 47 F4.2 mag E(J-Ks) [0.00,0.24] E(J-Ks) reddening (G7) 49- 52 F4.2 mag E(B-V) [0.00,0.40] E(B-V) reddening (G3) 54- 57 F4.2 --- Rv [2.16,4.07] Rv total-to-selective extinction ratio (G4) 59- 62 F4.2 mag Av [0.00,1.15] Av interstellar extinction (G5)
Global notes: Note (G1): Taken from Gaia DR1 TGAS (Cat. I/337). Note (G2): The E(J-Ks) (2MASS J and Ks bands) are interpolated from the 3D reddening map of Gontcharov (2017AstL...43..472G, 2017PAZh...43..521G, Cat. J/PAZh/43/521) by use of the rMoMW distances from Astraatmadja and Bailer-Jones (2016ApJ...833..119A, Cat. J/ApJ/833/119). Note (G3): The E(B-V) are calculated as E(B-V)=E(J-Ks)*(0.047X3-0.1X2-0.09X+1.74), where X=(BT-VT) (B_T and V_T Tycho-2 bands) following the extinction law. This refined relation supersedes E(B-V)=1.655E(J-Ks) in the original 3D reddening map of Gontcharov (2017AstL...43..472G, 2017PAZh...43..521G, Cat. J/PAZh/43/521). Note (G4): The Rv are interpolated from the 3D map of Rv of Gontcharov (2012AstL...38...12G, 2012PAZh...38...15G, Cat. J/PAZh/38/15). Note (G5): The Av are the product of E(B-V) and Rv. Note (G6): Taken from Hipparcos (I/311). Note (G7): The E(J-Ks) (2MASS J and Ks bands) are interpolated from the 3D reddening map of Gontcharov (2017AstL...43..472G, 2017PAZh...43..521G, Cat. J/PAZh/43/521) by use of the distances as 1/Plx, where Plx are from Hipparcos (I/311).
Acknowledgements: George Gontcharov, george.gontcharov(at)tdt.edu.vn
(End) George Gontcharov [Ton Duc Thang Univ.] Patricia Vannier [CDS] 24-Jan-2018
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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