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J/ApJ/794/60                SDSS RGB stars distances                (Tan+, 2014)

Red giant stars from the Sloan Digital Sky Survey. II. Distances. Tan K., Chen Y., Carrell K., Zhao J., Zhao G. <Astrophys. J., 794, 60 (2014)> =2014ApJ...794...60T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Milky Way ; Stars, distances ; Photometry, SDSS ; Abundances, [Fe/H] ; Effective temperatures ; Isochrones Keywords: Galaxy: stellar content - stars: distances Abstract: We present distance determinations for a large and clean sample of red giant branch stars selected from the ninth data release of the Sloan Digital Sky Survey (Adelman-McCarthy et al. 2012ApJS..203...21A, Cat. V/139). The distances are calculated based on both observational cluster fiducials and theoretical isochrones. Distributions of distances from the two methods are very similar with peaks at about 10 kpc and tails extending to more than 70 kpc. We find that distances from the two methods agree well for the majority of the sample stars; though, on average, distances based on isochrones are 10% higher than those based on fiducials. We test the accuracy of our distance determinations using 332 stars from 10 Galactic globular and open clusters. The average relative deviation from the literature cluster distances is 4% for the fiducial-based distances and 8% for the isochrone-based distances, both of which are within the uncertainties. We find that the effective temperature and surface gravity derived from low-resolution spectra are not accurate enough to essentially improve the performance of distance determinations. However, for stars with significant extinction, effective temperature may help to better constrain their distances to some extent. We make our sample stars and their distances available from an online catalog. The catalog comprises 17941 stars with reasonable distance estimations reaching to more than 70 kpc, which is suitable for the investigation of the formation and evolution of the Galaxy, especially the Galactic halo. Description: Our sample stars were selected from the SDSS DR9 database, which includes stars obtained during the original SDSS, the Sloan Extension for Galactic Understanding and Exploration (SEGUE; Yanny et al. 2009, J/AJ/137/4377) in SDSS-II, and SEGUE-2 (Rockosi et al., in preparation) in SDSS-III. First, we limited our sample to stars whose spectra have signal-to-noise ratios (S/Ns) larger than 10. To eliminate early-type stars, we selected stars with effective temperatures between 3000 and 10000 K. Then, stars with surface gravities less than 3.5 and (g-r)0 between 0.4 and 1.0 were selected to ensure that most of the sample stars were RGB stars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 146 17941 Parameters of the Sample Stars
See also: V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Plate SDSS plate identifier 6- 10 I5 d MJD Modified Julian Date of the observation 12- 14 I3 --- Fiber SDSS fiber identifier 16- 23 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000) 25- 32 F8.4 deg DEdeg Declination in decimal degrees (J2000) 34- 38 F5.2 [-] [Fe/H] Metallicity 40- 43 F4.2 [-] e_[Fe/H] Uncertainty in [Fe/H] 45- 48 I4 K Teff Effective temperature 50- 52 I3 K e_Teff Uncertainty in Teff 54- 57 F4.2 [cm/s2] log(g) Log of the surface gravity 59- 62 F4.2 [cm/s2] e_log(g) Uncertainty in log(g) 64- 69 F6.1 km/s HRV Heliocentric radial velocity 71- 76 F6.3 mag gmag SDSS g band magnitude; extinction corrected 78- 82 F5.3 mag g-r SDSS (g-r) color; extinction corrected 84- 88 F5.3 mag e_gmag Uncertainty in gmag 90- 94 F5.3 mag e_rmag Uncertainty in the r band magnitude 96-101 F6.2 kpc Dfid Distance based on fiducials 103-107 F5.2 kpc e_Dfid Uncertainty in Dfid 109-114 F6.2 kpc Dall Distance based on isochrones; all parameters included 116-120 F5.2 kpc e_Dall Uncertainty in Dall 122-127 F6.2 kpc D4 Distance based on isochrones (1) 129-133 F5.2 kpc e_D4 Uncertainty in D4 135-140 F6.2 kpc D3 Distance based on isochrones (2) 142-146 F5.2 kpc e_D3 Uncertainty in D3
Note (1): With [Fe/H], (g-r)0, and Teff included. Note (2): With only [Fe/H] and (g-r)0 included.
History: From electronic version of the journal References: Chen et al., Paper I, 2014ApJ...795...52C
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 27-Apr-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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