Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-29
Astron.Astrophys. 426 (2004) 1021-1034
Astronomy and Astrophysics
Astrophysics
17 pages, 10 figures. Accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20040568
Measured from high-resolution spectra, we present Ca II K line chromospheric fluxes in 35 G dwarf stars of 5 open clusters to determine the age-activity-rotation relationship from the young Hyades and Praesepe (0.6 Gyr) to the old M 67 (~ 4.5 Gyr) through the two intermediate age clusters IC 4651 and NGC 3680 (~ 1.7 Gyr). Our data show that a dramatic decrease in chromospheric activity takes place among solar stars between the Hyades and the IC4651 age, in about 1 Gyr. Afterwards, activity remains virtually constant for more than 3 Gyr. We briefly investigate the impact of this result on the age determinations of field G dwarfs in the solar neighborhood; the two main conclusions are that a consistent group of 'young' stars (i.e. as active as Hyades stars) is present, and that it is virtually impossible to give accurate chromospheric ages for stars older than ~ 2 Gyr. The observed abrupt decline in activity explains very well the Vaughan-Preston gap.
Pace Giancarlo
Pasquini Luca
No associations
LandOfFree
The Age-Activity-Rotation Relationship in Solar-Type Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Age-Activity-Rotation Relationship in Solar-Type Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Age-Activity-Rotation Relationship in Solar-Type Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-525361