J/A+A/561/A142 Galactic extinction from SDSS BHB stars (Tian+, 2014)
Exploring the total Galactic extinction with SDSS BHB stars.
Tian H.J., Liu C., Hu J.Y., Xu Y., Chen X.L.
<Astron. Astrophys. 561, A142 (2014)>
=2014A&A...561A.142T 2014A&A...561A.142T
ADC_Keywords: Clusters, globular ; Stars, horizontal branch ; Stars, blue ;
Extinction
Keywords: dust, extinction - stars: horizontal-branch -
Galaxy: stellar content - methods: statistical
Abstract:
We use 12530 photometrically-selected BHB stars from Sloan Digital
Sky Survey DR7 to estimate, the total extinction of the Milky Way in
high Galactic latitude, RV and AV in each line of sight.
A Bayesian method is developed to estimate the reddening values in the
given lines of sight. Based on the most likely values of reddening in
multiple colors, we are able to derive the values of RV and AV.
We select 94 zero-reddened BHB stars from 7 globular cluster as the
template. The reddening in the 4 SDSS colors for the northern Galactic
cap are estimated by comparing the field BHB stars with the template
stars.
Description:
File table3 contains the SDSS colors of the 94 template BHB stars and
their coordinates and the errors of colors. The 94 BHB stars are
selected from 7 globular clusters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 118 94 List of the 94 BHB template stars
table4.dat 135 9079 Total extinction in each line of sight
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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3- 20 I18 --- objID Object identification from SDSS-DR7
22- 31 F10.6 deg GLON Galactic longitude
33- 41 F9.6 deg GLAT Galactic latitude
43- 50 F8.6 mag u-g Extinction-corrected color index in u-g (SDSS)
52- 60 F9.6 mag g-r Extinction-corrected color index in g-r (SDSS)
62- 70 F9.6 mag r-i Extinction-corrected color index in r-i (SDSS)
72- 80 F9.6 mag i-z Extinction-corrected color index in i-z (SDSS)
82- 89 F8.6 mag e_u-g Error of color Index in u-g (SDSS)
91- 98 F8.6 mag e_g-r Error of color Index in g-r (SDSS)
100-107 F8.6 mag e_r-i Error of color Index in r-i (SDSS)
109-116 F8.6 mag e_i-z Error of color Index in i-z (SDSS)
118 I1 --- gID [1/7] ID of the globular cluster (1)
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Note (1): Globular cluster ID as follows:
1 = Pal5
2 = NGC5904
3 = NGC6205
4 = NGC5466
5 = NGC5272
6 = NGC5024
7 = NGC5053
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 deg RAdeg Right ascension (J2000)
5- 7 I3 deg DEdeg Declination (J2000)
9- 19 E11.8 mag E(u-g) Reddening value in u-g
21- 31 E11.8 mag E(g-r) Reddening value in g-r
33- 43 E11.8 mag E(r-i) Reddening value in r-i
45- 55 E11.8 mag E(i-z) Reddening value in i-z
57- 65 E9.7 mag e_E(u-g) Measured error of reddening value in u-g
67- 75 E9.7 mag e_E(g-r) Measured error of reddening value in g-r
77- 85 E9.7 mag e_E(r-i) Measured error of reddening value in r-i
87- 95 E9.7 mag e_E(i-z) Measured error of reddening value in i-z
97-107 E11.8 mag AV Extinction in V-band
109-116 F8.6 mag e_AV Measured error of extinction in V-band
118-127 F10.7 --- RV The total-to-selective extinction ratio
(extinction parameter in the extinction law)
129-135 F7.5 --- e_RV Measured error of RV
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Acknowledgements:
Haijun Tian, hjtian2000(at)gmail.com
LAMOST project supports me as LAMOST Fellow
History:
* 26-Nov-2013: Original version
* 26-Mar-2014: Corrected version of table3 from the author (Haijun Tian)
containing the full SDSS-DR7 object identification
(End) Haijun Tian [NAOC], Patricia Vannier [CDS] 26-Nov-2013