FAST ROTATION vs. METALLICITY

Ronaldo Levenhagen (1) , Nelson Vani Leister (1) , Juan Zorec (2) , Yves Fremat (3)

1 IAGSAUSP - Instituto de Astronomia Geofisica e Ciencias Astmosfericas
2 IAP - Institut d'Astrophysique de Paris
3 ROB - Royal Observatory of Belgium = Observatoire Royal de Belgique

Fast rotation seems to be the major factor to trigger the Be phenomenon. Surface fast rotation can be favored by initial formation conditions such as metal abundance. Models of fast rotating atmospheres and evolutionary tracks are used to determine the stellar fundamental parameters of 120 Be stars situated in spatially well-separated regions to imply there is between them some gradient of metallicity. We study the effects of the incidence of this gradient on the nature of the studied stars as fast rotators.

Mots clés: Stellar evolution; Be stars

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

Ronaldo Levenhagen, Nelson Vani Leister, Juan Zorec, Yves Fremat. FAST ROTATION vs. METALLICITY. Societe Francaise d'Astronomie et d'Astrophysique, 2005, France. ⟨hal-00008530⟩