1999A&A...341L..71V


Query : 1999A&A...341L..71V

1999A&A...341L..71V - Astronomy and Astrophysics, volume 341, L71-74 (1999/1-3)

Hipparcos distance calibrations for 9 open clusters.

VAN LEEUWEN F.

Abstract (from CDS):

Parallaxes have been determined for 9 nearby open clusters in order to derive a composite, age resolved, HR diagram. An age-luminosity relation was found to exist for main-sequence stars. A suggested 1 mas error in the Hipparcos parallax for the Pleiades, to explain the difference with the ground-based photometric distance estimate, seems unlikely: 5 other young open clusters examined (IC 2602, IC 2391, α Per, NGC 2451 and Blanco 1) all share the Pleiades main sequence locus in the HR diagram. The 3 older open clusters (Coma Ber, Praesepe and NGC 6475) were found displaced towards brighter magnitudes. These trends are more pronounced than predicted by theoretical stellar evolution models, and affect distance, metallicity and possibly also age determinations for open- and globular clusters through the use of theoretical isochrones.

Abstract Copyright:

Journal keyword(s): stars: distances - stars: evolution - stars: Hertzsprung-Russel (HR) and C-M diagrams - Galaxy: open clusters and associations: general

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Cl Blanco 1 OpC 00 03 25 -29 57.5           ~ 276 0
2 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 795 0
3 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3184 0
4 NGC 2451 Cl* 07 45.4 -37 58           ~ 155 1
5 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1384 0
6 IC 2391 OpC 08 41 10 -52 59.5           ~ 766 0
7 IC 2602 OpC 10 42 27 -64 25.6           ~ 610 0
8 Cl Melotte 111 OpC 12 24 03 +25 39.1           ~ 438 0
9 C 1232+365 OpC 12 35 01 +36 22.3     6.3     ~ 16 0
10 NGC 6475 OpC 17 53 47 -34 50.5           ~ 355 0
11 Cl Collinder 399 Cl* 19 25.4 +20 11   3.93 3.6     ~ 20 0

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2022.05.23-22:06:34

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