2006A&A...453..101L


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET12:08:11

2006A&A...453..101L - Astronomy and Astrophysics, volume 453, 101-119 (2006/7-1)

On the difference between nuclear and contraction ages.

LYRA W., MOITINHO A., VAN DER BLIEK N.S. and ALVES J.

Abstract (from CDS):

Ages derived from low mass stars still contracting onto the main sequence often differ from ages derived from the high mass ones that have already evolved away from it. We investigate the general claim of disagreement between these two independent age determinations by presenting UBVRI photometry for the young galactic open clusters NGC 2232, NGC 2516, NGC 2547 and NGC 4755, spanning the age range ∼10-150Myr We derived reddenings, distances, and nuclear ages by fitting ZAMS and isochrones to color-magnitudes and color-color diagrams. To derive contraction ages, we used four different pre-main sequence models, with an empirically calibrated color-temperature relation to match the Pleiades cluster sequence. When exclusively using the V vs. V-I color-magnitude diagram and empirically calibrated isochrones, there is consistency between nuclear and contraction ages for the studied clusters. Although the contraction ages seem systematically underestimated, in none of the cases do they deviate by more than one standard deviation from the nuclear ages.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: general - galaxies: star clusters - stars: formation - techniques: photometric - Hertzsprung-Russell (HR) and C-M diagrams

VizieR on-line data: <Available at CDS (J/A+A/453/101): table6.dat table7.dat table8.dat table9.dat>

Nomenclature: Tables 6-9: [LMV2006] NGC NNNN JHHMMSS.ss+DDMMSS.s N=1407+3461+12813+7188.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 14

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Number of rows : 14

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 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3064 0
2 V* GG Tau Or* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 665 1
3 V* V397 Aur Or* 04 56 02.0261376554 +30 21 03.635056925   13.07 11.72 11.25   K7e 154 0
4 V* V1642 Ori TT* 05 29 20.633592 +00 41 27.99600   13.31 12.31 12.03   K2 45 0
5 V* V1174 Ori Or* 05 34 27.8535605060 -05 41 37.876152541 16.506 15.070 14.305   12.367 M0 51 0
6 M 42 HII 05 35 17.3 -05 23 28           ~ 3777 0
7 NAME Ori A MoC 05 38 -07.1           ~ 2742 0
8 NGC 2232 OpC 06 27 15 -04 45.5           ~ 137 0
9 * 10 Mon bC* 06 27 57.5686511 -04 45 43.752881 4.11 4.861 5.041     B2V 128 0
10 NGC 2362 OpC 07 18 41 -24 57.3           ~ 364 0
11 NGC 2516 OpC 07 58 04 -60 45.2           ~ 607 0
12 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 326 0
13 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1290 0
14 NGC 4755 OpC 12 53 39 -60 21.7           ~ 270 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-12:08:11

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