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The Age-Activity-Rotation Relationship in Solar-Type Stars | | Giancarlo Pace
; Luca Pasquini
; | | Date: |
29 Jun 2004 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/0406651 | | Services: | Forum | Review | PDF | Favorites | |
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