J/AJ/165/224 Distance determinations for LAMOST DR8 K-giants (Zhang+, 2023)
A Catalog of Distance Determinations for the LAMOST DR8 K-Giants in the
Galactic Halo.
Zhang L., Xue X.-X., Yang C., Wang F., Rix H.-W., Zhao G., Liu C.
<Astron. J., 165, 224 (2023)>
=2023AJ....165..224Z 2023AJ....165..224Z
ADC_Keywords: Milky Way; Stars, K-type; Stars, giant; Spectra, optical;
Radial velocities; Effective temperatures
Keywords: Distance measure ; Stellar distance ; K giant stars ; Milky
Way stellar halo
Abstract:
We present a catalog of distances for 19544 K-giants drawn from Large
Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR8. Most
of them are located in the halo of the Milky Way up to ∼120kpc. There
are 15% K-giants without Sloan Digital Sky Survey (SDSS) photometry,
for which we supplements with Pan-STARRS1 (PS1) photometry calibrated
to SDSS photometric system. The possible contamination of the red
clumps/horizontal branch are removed according to metallicities and
colors before the distance determination. Combining the LAMOST
spectroscopic metallicities with the SDSS/PS1 photometry, we estimate
the absolute magnitudes in the SDSS r-band, the distance moduli, and
the corresponding uncertainties through an Bayesian approach devised
by Xue et al. for the Sloan Extension for Galactic understanding and
exploration halo K-giants. The typical distance precision is about
11%. The stars in the catalog lie in a region of 4-126kpc from the
Galactic center, of which with 6320 stars beyond 20kpc and 273 stars
beyond 50kpc, forming the largest spectroscopic sample of distant
tracers in the Milky Way halo so far.
Description:
Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) is
a quasimeridian reflecting Schmidt telescope with an effective
aperture of 4m and 4000 optical fibers, from which numerous
low-resolution (R∼1800) spectra covering a wavelength range of
3700<λ<9000Å of stars with r<19 can be obtained
simultaneously at one exposure.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 219 19544 Catalog of 19544 K-giants selected from LAMOST DR8
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/ApJ/518/262 : CCD VIc Photometry of M30 Stars (Sandquist+, 1999)
J/ApJ/684/1143 : BHB candidates in the Milky Way (Xue+, 2008)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)
J/ApJ/738/79 : SDSS-DR8 BHB stars in the Milky Way's halo (Xue+, 2011)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/ApJ/784/170 : SEGUE K giant survey. II. Dist of 6036 stars (Xue+, 2014)
J/ApJ/886/154 : Sgr stream K- & M-giants and BHB stars (Yang+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 22 F22.18 deg RAdeg [0/360] Right Ascension (J2000)
24- 45 F22.19 deg DEdeg [-9/87] Declination (J2000)
47- 53 F7.4 mag rmag [12.8/18.1] Intrinsic, r-band magnitude
55- 60 F6.4 mag e_rmag [0.03/0.07] Uncertainty in rmag
62- 67 F6.4 mag (g-r) [0.52/1.41] Intrinsic (g-r) color
69- 74 F6.4 mag e_(g-r) [0.01/0.07] Uncertainty in (G-R)
76- 82 F7.2 km/s RVel [-495/452] Radial velocity
84- 88 F5.2 km/s e_RVel [1.65/88.9]? Uncertainty in RVel
90- 93 I4 K Teff [3812/5597] Effective temperature
95- 97 I3 K e_Teff [11/867]? Uncertainty in Teff
99-104 F6.3 [cm/s2] logg [-0.04/4] log surface gravity
106-110 F5.3 [cm/s2] e_logg [0.01/2]? Uncertainty in logg
112-117 F6.3 [Sun] [Fe/H] [-2.5/0.31] Metallicity
119-123 F5.3 [Sun] e_[Fe/H] [0.01/0.9]? Uncertainty in [Fe/H]
125-131 F7.4 mag DM5 [10/21] Distance modulus at the 5% confidence
level
133-139 F7.4 mag DM16 [11/21] Distance modulus at the 16% confidence
level
141-147 F7.4 mag DM50 [12/21] Distance modulus at the 50% confidence
level
149-155 F7.4 mag DM84 [12/21] Distance modulus at the 84% confidence
level
157-163 F7.4 mag DM95 [13/21] Distance modulus at the 95% confidence
level
165-170 F6.4 mag e_DM50 [0.05/0.7] Uncertainty in DM50
172-178 F7.4 mag rMAG [-3.14/1.29] Absolute r band magnitude
180-185 F6.4 mag e_rMAG [0.06/0.7] Uncertainty in rMag
187-194 F8.4 kpc Dist [2.95/122] Distance
196-202 F7.4 kpc e_Dist [0.3/16] Uncertainty in Dist
204-211 F8.4 kpc rGC [3.79/126] Galactocentric distance
213-219 F7.4 kpc e_rGC [0.001/16] Uncertainty in rGC
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 03-Oct-2023