On the evolutionary status of Beta Pictoris

Details On the evolutionary status of Beta Pictoris On the evolutionary status of Beta Pictoris

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247l..25p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 1, July 1991, p. L25-L27.

Astronomy and Astrophysics

Astrophysics

37

A Stars, Extrasolar Planets, Stellar Evolution, Dwarf Stars, Early Stars, Main Sequence Stars, Stellar Envelopes

Scientific paper

Contrary to recent speculation, Beta Pictoris is a young dwarf A5 star probably just arrived on the main sequence. Its reported underluminosity of 0.5 magnitudes or more with respect to a typical main sequence A5 star may simply be due to its relatively low metal abundance with respect to the sun of M/H = -0.6 + or - 0.3 dex, and not to gray extinction due to large particles in a nearly edge-on circumstellar disk. This removes the discrepancy between small or intermediate size particle models with near IR size measurements. A comparison with the appropriate theoretical isochrones indicates that its age is less than 200 million years and, thus, that it is not an evolved star with a bipolar nebula.

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