INVESTIGADORES
MAUAS Pablo Jacobo David
congresos y reuniones científicas
Título:
Chromospheric Models in ω Centauri Red Giant Stars
Autor/es:
VIEYTES, M. C.; MAUAS, P.J.D.; CACCIARI, C.; ORIGLIA, L.; PANCINO, E.
Lugar:
Seattle
Reunión:
Congreso; 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun; 2010
Institución organizadora:
Workshop on Cool Stars, Stellar Systems, and the Sun
Resumen:
Mass loss of ? 0.1-0.3 Msun from Population II red
giant stars is a requirement of stellar evolution theory in order to
account for several observational evidences in globular clusters. The
aim of this study is to detect the presence of outward velocity fields,
that are indicative of mass outflow, in six luminous red giant stars of
the stellar globular cluster ω Cen. We compare synthetic line
profiles computed using relevant model chromospheres to observed
profiles of the Hα and Ca II K lines. We do indeed reveal the
presence of low velocity outward motions in four of our six targets,
with no apparent correlation with astrophysical parameters.