2015AJ....150....4C


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST02:41:01

2015AJ....150....4C - Astron. J., 150, 4 (2015/July-0)

Estimation of distances to stars with stellar parameters from LAMOST.

CARLIN J.L., LIU C., NEWBERG H.J., BEERS T.C., CHEN L., DENG L., GUHATHAKURTA P., HOU J., HOU Y., LEPINE S., LI G., LUO A.-L., SMITH M.C., WU Y., YANG M., YANNY B., ZHANG H. and ZHENG Z.

Abstract (from CDS):

We present a method to estimate distances to stars with spectroscopically derived stellar parameters. The technique is a Bayesian approach with likelihood estimated via comparison of measured parameters to a grid of stellar isochrones, and returns a posterior probability density function for each star's absolute magnitude. This technique is tailored specifically to data from the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) survey. Because LAMOST obtains roughly 3000 stellar spectra simultaneously within each ∼5° diameter ``plate'' that is observed, we can use the stellar parameters of the observed stars to account for the stellar luminosity function and target selection effects. This removes biasing assumptions about the underlying populations, both due to predictions of the luminosity function from stellar evolution modeling, and from Galactic models of stellar populations along each line of sight. Using calibration data of stars with known distances and stellar parameters, we show that our method recovers distances for most stars within ∼20%, but with some systematic overestimation of distances to halo giants. We apply our code to the LAMOST database, and show that the current precision of LAMOST stellar parameters permits measurements of distances with ∼40% error bars. This precision should improve as the LAMOST data pipelines continue to be refined.

Abstract Copyright:

Journal keyword(s): Galaxy: stellar content - Galaxy: structure - stars: distances - surveys

Simbad objects: 7

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Number of rows : 7

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 NGC 1039 OpC 02 42 05 +42 45.7           ~ 383 0
2 NGC 1647 OpC 04 45 55 +19 06.9   6.82 6.4     ~ 146 0
3 NGC 1662 OpC 04 48 27 +10 56.2   7.0 6.4     ~ 110 0
4 NGC 2168 OpC 06 08 54 +24 20.0           ~ 476 0
5 NGC 2281 OpC 06 48 17 +41 04.7   6.05 5.4     ~ 129 0
6 [KPR2005] 26 OpC 06 50 24 +07 15.0           ~ 17 0
7 NGC 2548 OpC 08 13 43 -05 45.0           ~ 148 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-02:41:01

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