Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-23
Astrophys.J.669:1167-1189,2007
Astronomy and Astrophysics
Astrophysics
58 pages, 18 color figures, accepted for publication in The Astrophysical Journal; Age uncertainties slightly modified upon co
Scientific paper
10.1086/519295
We here develop an improved way of using a rotating star as a clock, set it using the Sun, and demonstrate that it keeps time well. This technique, called gyrochronology, permits the derivation of ages for solar- and late-type main sequence stars using only their rotation periods and colors. The technique is clarified and developed here, and used to derive ages for illustrative groups of nearby, late-type field stars with measured rotation periods. We first demonstrate the reality of the interface sequence, the unifying feature of the rotational observations of cluster and field stars that makes the technique possible, and extends it beyond the proposal of Skumanich by specifying the mass dependence of rotation for these stars. We delineate which stars it cannot currently be used on. We then calibrate the age dependence using the Sun. The errors are propagated to understand their dependence on color and period. Representative age errors associated with the technique are estimated at ~15% (plus possible systematic errors) for late-F, G, K, & early-M stars. Ages derived via gyrochronology for the Mt. Wilson stars are shown to be in good agreement with chromospheric ages for all but the bluest stars, and probably superior. Gyro ages are then calculated for each of the active main sequence field stars studied by Strassmeier and collaborators where other ages are not available. These are shown to be mostly younger than 1Gyr, with a median age of 365Myr. The sample of single, late-type main sequence field stars assembled by Pizzolato and collaborators is then assessed, and shown to have gyro ages ranging from under 100Myr to several Gyr, and a median age of 1.2Gyr. Finally, we demonstrate that the individual components of the three wide binaries XiBooAB, 61CygAB, & AlphaCenAB yield substantially the same gyro ages.
No associations
LandOfFree
Ages for illustrative field stars using gyrochronology: viability, limitations and errors 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 Ages for illustrative field stars using gyrochronology: viability, limitations and errors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ages for illustrative field stars using gyrochronology: viability, limitations and errors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-224874