2017MNRAS.470L..97G

Query : 2017MNRAS.470L..97G

2017MNRAS.470L..97G - Mon. Not. R. Astron. Soc., 470, L97-L101 (2017/September-1)

On the discrepancy between asteroseismic and Gaia DR1 TGAS parallaxes.

GONTCHAROV G.A. and MOSENKOV A.V.

Abstract (from CDS):

Recently, a deviation of the Gaia Tycho-Gaia Astrometric Solution (TGAS) parallaxes from the asteroseismic ones for giants was found. We show that for parallaxes p < 1.5 mas it can be explained by a selection effect in favour of bright and luminous giants in the Tycho-2 and TGAS catalogues. Another explanation of this deviation seems to be valid for p > 1.5 mas based on the best extinction estimates: The deviation may be caused not by a bias of parallax, but by an underestimation of the extinction (and, consequently, an overestimation of the calculated absolute magnitude) in the asteroseismic results. We demonstrate that the reliable estimates of the reddening and extinction (about 0.22 mag of the visual extinction for the Kepler field) better fit both the giants and main-sequence stars to the PARSEC, MIST and YaPSI isochrones.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): parallaxes - stars: distances - stars: early-type - Hertzsprung-Russell and colourmagnitude diagrams - dust, extinction - dust, extinction

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Ori Arm PoG ~ ~           ~ 218 0

Query : 2017MNRAS.470L..97G

Basic data :
NAME Ori Arm -- Part of a Galaxy
Other object types: otypes_help 		PoG ()
ICRS coord. (ep=J2000) : 		No Coord.

Identifiers (3) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NAME Ori Arm NAME Orion Arm NAME Orion Spiral Arm

References (218 between 1850 and 2026) (Total 218)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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