Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..220b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 220-224. Research supported by the Smithsonian Scho
Astronomy and Astrophysics
Astrophysics
34
A Stars, Dwarf Stars, F Stars, Stellar Evolution, Stellar Winds, Radio Spectra, Stellar Atmospheres, Stellar Mass Ejection, Stellar Models, Stellar Spectra, Very Large Array (Vla)
Scientific paper
Following the suggestion of Willson et al. (1987) that A- and F-type main-sequence stars might undergo significant mass loss due to pulsationally driven winds, upper limits to the ionized mass loss from A and F dwarfs have been obtained using VLA observations. These stringent upper limits show that the level of ionized mass loss would have at most only a small effect on stellar evolution. Radiative-equilibrium atmospheric and wind models for early A dwarfs indicate that it is highly likely that a wind flowing from such stars would be significantly ionized. In addition, late A and early F dwarfs exhibit chromospheric emission indicative of significant nonradiative heating. The present mass-loss limits are thus representative of the total mass-loss rates for these stars. It is concluded that A and F dwarfs are not losing sufficient mass to cause A dwarfs to evolve into G dwarfs.
Bookbinder Jay A.
Brown Alexander
Hubeny Ivan
Judge Philip
Veale Anthony
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