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Far-red spectroscopy of peculiar stars and the GAIA mission
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Exotic Stars as Challenges to Evolution
ASP Conference Series, Vol. ,
C.A. Tout and W. van Hamme ed.s
Far-red spectroscopy of peculiar stars and the GAIA
mission
Ulisse Munari
Osservatorio Astronomico di Padova, Sede di Asiago,
36012 Asiago (VI), Italy, (munari@pd.astro.it)
Abstract. The coming GAIA Cornerstone mission by ESA will provide
micro-arcsec astrometry, ～10 bands photometry and far-red spectroscopy
for a huge number of stars in the Galaxy (109). GAIA spectroscopy will
cover the range 8480–8740 A? which includes the CaII triplet and the head
of the Paschen series. In this paper we address the diagnostic potential
of this wavelength range toward detection of peculiar stars.
1. Introduction
The large impact that the Hipparcos astrometric mission by ESA had on many
fields of astrophysics is well known to the community. This is even more remark-
able by considering that the Hipparcos observations were complete to just V ～8
mag and the horizon for astrometric errors less than 10% (R10%) was limited to
0.1 kpc, i.e. the solar neighborhood. Nevertheless, Hipparcos data have been
the main driver or at least a contributor to more than 1900 papers since the
release to the community of the mission data in 1997.
Hipparcos was still flying when the European community begun openly
speaking of its successor, with ideas already well in focus about GAIA by the
time of the Cambridge 1995 ESA colloquium on the future of astrometry in space
(ESA SP-379). Since then, GAIA has been at the center of a continent-wide
effort dealing with its science goals and the technical design, culminated with
the formal mission approval in the fall of 2000. Perryman et al. (2001, and
references therein) provides an useful introduction to GAIA.
Before GAIA (http://astro.estec.esa.nl/GAIA/) which launch is scheduled
for not later than 2012, two other survey astrometric missions could fly if their
current financial problems will
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