Rotation Periods of the Hyades Open Cluster using ASAS Light Curves: Measuring the Hyades Gyro-Age and Benchmarking Tools for Gyrochronology Studies with LSST

Details Rotation Periods of the Hyades Open Cluster using ASAS Light Curves: Measuring the Hyades Gyro-Age and Benchmarking Tools for Gyrochronology Studies with LSST Rotation Periods of the Hyades Open Cluster using ASAS Light Curves: Measuring the Hyades Gyro-Age and Benchmarking Tools for Gyrochronology Studies with LSST

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915213k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #152.13

Astronomy and Astrophysics

Astronomy

Scientific paper

Rotation period distributions for older open clusters are difficult to obtain because of the general scarcity of clusters with ages greater than 200 Myr and the challenge in measuring rotation periods for less active older stars. This has clouded our knowledge of how stars spin down as they evolve from the zero-age main sequence. A key piece of our understanding of how stellar rotation rates change over time relies on the study of the nearby (∼45 pc) and old (? Myr) Hyades open cluster. We present the results from a detailed analysis of the rotation period distribution of the Hyades in an effort to estimate the gyro-age of this benchmark open cluster. Analyzing All Sky Automated Survey (ASAS) light curves with 10+ year baselines, we measure rotation periods for Hyads by applying a period-finding technique that combines the Lomb-Scargle periodogram with Monte Carlo simulations to optimize period detection in long-baseline, low-cadence data which might suffer from time-dependent changes in the light curve, e.g. star spot evolution. We derive rotation periods for known Hyades members, of which a significant number are newly determined periods not currently found in the literature. These rotation periods measured from ASAS light curves allow us to characterize the rotation period distribution of the Hyades, enabling the application of current gyrochronology models to calculate a precise rotation-age for the cluster. Additionally, using ASAS data provides a valuable test of determining rotation periods in future low-cadence, extended duration surveys, such as the Large Synoptic Survey Telescope (LSST), and assesses our ability to estimate stellar ages via gyrochronology from sparsely sampled, long-baseline light curve data.

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