2015A&A...581A...2K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:04:21

2015A&A...581A...2K - Astronomy and Astrophysics, volume 581A, 2-2 (2015/9-1)

Are the gyro-ages of field stars underestimated ?

KOVACS G.

Abstract (from CDS):

By using the current photometric rotational data on eight galactic open clusters, we show that the evolutionary stellar model (isochrone) ages of these clusters are tightly correlated with the period shifts applied to the (B-V)0-Prot ridges that optimally align these ridges to the one defined by Praesepe and the Hyades. On the other hand, when the traditional Skumanich-type multiplicative transformation is used, the ridges become far less aligned due to the age-dependent slope change introduced by the period multiplication. Therefore, we employ our simple additive gyro-age calibration on various datasets of Galactic field stars to test its applicability. We show that, in the overall sense, the gyro-ages are systematically greater than the isochrone ages. The difference could exceed several giga years, depending on the stellar parameters. Although the age overlap between the open clusters used in the calibration and the field star samples is only partial, the systematic difference indicates the limitation of the currently available gyro-age methods and suggests that the rotation of field stars slows down with a considerably lower speed than we would expect from the simple extrapolation of the stellar rotation rates in open clusters.

Abstract Copyright:

Journal keyword(s): stars: rotation - starspots - open clusters and associations: general

Simbad objects: 15

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Number of rows : 15

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 Cl Blanco 1 OpC 00 04 07 -29 50.0           ~ 233 0
2 HD 15082 dS* 02 26 51.0582746497 +37 33 01.737746137   8.41 8.14     kA5hA8mF4 135 1
3 NGC 1039 OpC 02 42 05 +42 45.7           ~ 370 0
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2978 0
5 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2654 0
6 M 37 OpC 05 52 18 +32 33.2   6.19 5.6     ~ 332 2
7 NGC 2168 OpC 06 08 54 +24 20.0           ~ 457 0
8 HD 42176 * 06 10 39.3452456624 +30 57 25.717178081   9.23 8.71     F7V 38 1
9 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1224 0
10 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
11 * rho01 Cnc PM* 08 52 35.8113282132 +28 19 50.956901366 7.45 6.82   5.4   K0IV-V 969 1
12 HATS-2 * 11 46 57.3702861837 -22 33 46.816907262   14.53 13.62 13.40   ~ 25 1
13 NGC 6811 OpC 19 37 17 +46 23.3   7.47 6.8     ~ 250 0
14 NGC 6819 OpC 19 41 18 +40 11.2   8.21 7.3     ~ 465 0
15 NGC 6866 OpC 20 03 55 +44 09.5   8.04 7.6     ~ 126 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-15:04:21

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