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dc.contributor.authorSilvestri, Nicole M.
dc.contributor.authorHawley, Suzanne L.
dc.contributor.authorOswalt, T. D.
dc.date.accessioned2017-06-13T20:06:45Z
dc.date.available2017-06-13T20:06:45Z
dc.date.issued2005-05
dc.identifier.citationSilvestri, N. M., Hawley, S. L., & Oswalt, T. D. (2005). The chromospheric activity and ages of M dwarf stars in wide binary systems. Astronomical Journal, 129(5), 2428-2450. doi:10.1086/429593en_US
dc.identifier.urihttp://hdl.handle.net/11141/1563
dc.description.abstractWe investigate the relationship between age and chromospheric activity for 139 M dwarf stars in wide binary systems with white dwarf companions. The age of each system is determined from the cooling age of its white dwarf component. The current limit for activity-age relations found for M dwarfs in open clusters is 4 Gyr. Our unique approach to finding ages for M stars allows for the exploration of this relationship at ages older than 4 Gyr. The general trend of stars remaining active for a longer time at a later spectral type is confirmed. However, our larger sample and greater age range reveal additional complexity in assigning age based on activity alone. We find that M dwarfs in wide binaries older than 4 Gyr depart from the loglinear relation for clusters and are found to have activity at magnitudes, colors, and masses that are brighter, bluer, and more massive than predicted by the cluster relation. In addition to our activity-age results, we present the measured radial velocities and complete space motions for 161 white dwarf stars in wide binaries.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is made available in accordance with publishers policy. It may be subject to U.S. copyright law.en_US
dc.rights.urihttps://aas.org/publications/aas-copyright-policyen_US
dc.titleThe chromospheric activity and ages of M dwarf stars in wide binary systemsen_US
dc.typeArticleen_US
dc.identifier.doi10.1086/429593


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