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 2018yCat.2354....0G
=2017MNRAS.472.3805G 2017MNRAS.472.3805G
+2018MNRAS.475.1121G 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 2009AstL...35..780G,
2010AstL...36..584G 2010AstL...36..584G, 2012AstL...38...12G 2012AstL...38...12G, 2012AstL...38...87G 2012AstL...38...87G,
2017AstL...43..472G 2017AstL...43..472G and finally 2017MNRAS.472.3805G 2017MNRAS.472.3805G and
2018MNRAS.475.1121G 2018MNRAS.475.1121G. The key basis of these estimates is the 3D
reddening map of Gontcharov (2017AstL...43..472G 2017AstL...43..472G, 2017PAZh...43..521G 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 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 2012AstL...38...12G, 2012PAZh...38...15G 2012PAZh...38...15G, Cat.
J/PAZh/38/15). The Av are the product of E(B-V) and Rv.
File Summary:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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)
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Byte-by-byte Description of file: hipext.dat
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Bytes Format Units Label Explanations
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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)
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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 2017AstL...43..472G, 2017PAZh...43..521G 2017PAZh...43..521G,
Cat. J/PAZh/43/521) by use of the rMoMW distances from Astraatmadja
and Bailer-Jones (2016ApJ...833..119A 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 2017AstL...43..472G, 2017PAZh...43..521G 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 2012AstL...38...12G, 2012PAZh...38...15G 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 2017AstL...43..472G, 2017PAZh...43..521G 2017PAZh...43..521G,
Cat. J/PAZh/43/521) by use of the distances as 1/Plx, where Plx are
from Hipparcos (I/311).
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Acknowledgements:
George Gontcharov, george.gontcharov(at)tdt.edu.vn
(End) George Gontcharov [Ton Duc Thang Univ.] Patricia Vannier [CDS] 24-Jan-2018