SIMBAD references

2019ApJ...887...84Z - Astrophys. J., 887, 84-84 (2019/December-2)

Stellar chromospheric activity and age relation from open clusters in the LAMOST survey.

ZHANG J., ZHAO J., OSWALT T.D., FANG X., ZHAO G., LIANG X., YE X. and ZHONG J.

Abstract (from CDS):

We identify member stars of more than 90 open clusters in the LAMOST survey. With the method of Fang et al., the chromospheric activity (CA) indices, logRCaK^′^ for 1091 member stars in 82 open clusters and logR^′^ for 1118 member stars in 83 open clusters, are calculated. The relations between the average logRCaK^′^, logR^′^ in each open cluster and its age are investigated in different Teff and [Fe/H] ranges. We find that CA starts to decrease slowly from log t = 6.70 to log t = 8.50, and then decreases rapidly until log t = 9.53. The trend becomes clearer for cooler stars. The quadratic functions between log R' and log t with 4000 K < Teff < 5500 K are constructed, which can be used to roughly estimate ages of field stars with accuracy about 40% for logRCaK^′^ and 60% for logR^′^.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Stellar activity - Stellar ages - Open star clusters

Simbad objects: 97

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2019ApJ...887...84Z and select 'bookmark this link' or equivalent in the popup menu


2020.11.29-21:42:13

© Université de Strasbourg/CNRS

    • Contact