The Age of Gl879 and Fomalhaut

Details The Age of Gl879 and Fomalhaut The Age of Gl879 and Fomalhaut

1997-04-02

arxiv.org/abs/astro-ph/9704021v1

ApJ (1997), 475, 313

Astronomy and Astrophysics

Astrophysics

27 pages, Postscript file

Scientific paper

10.1086/303518

We estimate here the age of one of the prototypes of the Beta Pic-like stars, Fomalhaut, based on the properties of its common proper motion companion Gl879. By combining constraints derived from the lithium abundance, rotational velocity, HR diagram position, and coronal activity we conclude that the age for Gl879, and hence the age for Fomalhaut, is 200$\pm$100 Myr. This age estimate agrees quite well with the completely independent age estimate derived directly from isochrone--fitting to Fomalhaut's position in an HR diagram, and thus confirms that circumstellar dust disks can persist in A stars for several hundred Myr.

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