2014A&A...561A.142T


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.14CEST02:14:13

2014A&A...561A.142T - Astronomy and Astrophysics, volume 561A, 142-142 (2014/1-1)

Exploring the total galactic extinction with SDSS BHB stars.

TIAN H.-J., LIU C., HU J.-Y., XU Y. and CHEN X.-L.

Abstract (from CDS):

We used 12530 photometrically-selected blue horizontal branch (BHB) stars from the Sloan Digital Sky Survey (SDSS) to estimate the total extinction of the Milky Way at the high Galactic latitudes, RV and AV in each line of sight. A Bayesian method was developed to estimate the reddening values in the given lines of sight. Based on the most likely values of reddening in multiple colors, we were able to derive the values of RV and AV. We selected 94 zero-reddened BHB stars from seven globular clusters as the template. The reddening in the four SDSS colors for the northern Galactic cap were estimated by comparing the field BHB stars with the template stars. The accuracy of this estimation is around 0.01mag for most lines of sight. We also obtained <RV> to be around 2.40±1.05 and AV map within an uncertainty of 0.1 mag. The results, including reddening values in the four SDSS colors, AV, and RV in each line of sight, are released on line. In this work, we employ an up-to-date parallel technique on GPU card to overcome time-consuming computations. We plan to release online the C++ CUDA code used for this analysis. The extinction map derived from BHB stars is highly consistent with that from Schlegel et al. (1998, ApJ, 500, 525). The derived RV is around 2.40±1.05. The contamination probably makes the RV be larger.

Abstract Copyright:

Journal keyword(s): dust, extinction - stars: horizontal-branch - Galaxy: stellar content - methods: statistical

VizieR on-line data: <Available at CDS (J/A+A/561/A142): table3.dat table4.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3693 0
2 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 742 0
3 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 554 0
4 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2313 0
5 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 749 0
6 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 648 1
7 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1815 0
8 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2047 0

    Equat.    Gal    SGal    Ecl

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2021.05.14-02:14:13

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