The Age-Activity-Rotation Relationship in Solar-Type Stars Export

@article{citeulike:3483588, 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.}, archivePrefix = {arXiv}, author = {Pace, Giancarlo and Pasquini, Luca}, citeulike-article-id = {3483588}, citeulike-linkout-0 = {http://arxiv.org/abs/astro-ph/0406651}, citeulike-linkout-1 = {http://arxiv.org/pdf/astro-ph/0406651}, day = {29}, eprint = {astro-ph/0406651}, keywords = {age-activity-rotation-relation}, month = {Jun}, posted-at = {2008-11-06 03:20:36}, priority = {4}, title = {The Age-Activity-Rotation Relationship in Solar-Type Stars}, url = {http://arxiv.org/abs/astro-ph/0406651}, year = {2004} }

TY - JOUR ID - citeulike:3483588 L3 - citeulike-article-id:3483588 N2 - 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. TI - The Age-Activity-Rotation Relationship in Solar-Type Stars KW - age-activity-rotation-relation AU - Pace, Giancarlo AU - Pasquini, Luca PY - 2004/Jun/29/ UR - http://arxiv.org/abs/astro-ph/0406651 ER -