2017A&A...606L...8K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:07:28

2017A&A...606L...8K - Astronomy and Astrophysics, volume 606, L8-8 (2017/10-1)

Open star clusters in the Milky Way. Comparison of photometric and trigonometric distance scales based on Gaia TGAS data.

KOVALEVA D.A., PISKUNOV A.E., KHARCHENKO N.V., ROSER S., SCHILBACH E., SCHOLZ R.-D., REFFERT S. and YEN S.X.

Abstract (from CDS):

Context. The global survey of star clusters in the Milky Way (MWSC) is a comprehensive list of 3061 objects that provides, among other parameters, distances to clusters based on isochrone fitting. The Tycho-Gaia Astrometric Solution (TGAS) catalogue, which is a part of Gaia data release 1 (Gaia DR1), delivers accurate trigonometric parallax measurements for more than 2 million stars, including those in star clusters.
Aims. We compare the open cluster photometric distance scale with the measurements given by the trigonometric parallaxes from TGAS to evaluate the consistency between these values.
Methods. The average parallaxes of probable cluster members available in TGAS provide the trigonometric distance scale of open clusters, while the photometric scale is given by the distances published in the MWSC. Sixty-four clusters are suited for comparison as they have more than 16 probable members with parallax measurements in TGAS. We computed the average parallaxes of the probable members and compared these to the photometric parallaxes derived within the MWSC.
Results. We find a good agreement between the trigonometric TGAS-based and the photometric MWSC-based distance scales of open clusters, which for distances less than 2.3 kpc coincide at a level of about 0.1 mas with no dependence on the distance. If at all, there is a slight systematic offset along the Galactic equator between 30° and 160° galactic longitude.

Abstract Copyright: © ESO, 2017

Journal keyword(s): techniques: photometric - parallaxes - proper motions - Galaxy: general - open clusters and associations: general - distance scale - distance scale

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 - 2020
#notes
1 NGC 869 OpC 02 19 00 +57 07.7           ~ 426 0
2 Ass Per OB 2 As* 03 42.2 +33 26           ~ 305 0
3 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2654 0
4 IC 2391 OpC 08 40 32 -53 02.0           ~ 714 0
5 NAME Alessi Teutsch 8 OpC 12 02.9 -60 55           ~ 13 0
6 Cl Platais 12 OpC 13 51 44 -63 27.2           ~ 23 0
7 NGC 6405 OpC 17 40 20 -32 15.2           ~ 168 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-14:07:28

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