|
|
The Asiago Red Clump Spectroscopic survey, ongoing since 2005, derives
from Asiago Echelle high resolution optical spectra accurate multi-epoch
radial velocities and atmospheric parameters (Teff, log g, [M/H], Vrot
sin i, [alpha/Fe], individual chemical abundances) for a well selected
sample of 500 equatorial Hipparcos Red Clump stars belonging to the solar
neighbourhood. The acquisition of spectra is complete for about half of the
sample. A revised absolute magnitude for Red Clump stars as function of
metallicity and other atmospheric parameters has been derived. The radial
velocities coupled with astrometric and photometric external data are used in
investigation of galactic structure and dynamics. This is M. Valentini PhD
project.
People: U. Munari, M. Valentini
Collaboration: T. Zwitter (Lubiana Univ.), K. Freeman (RSAA Mt Stromlo), M. Bellazzini (INAF OA Bologna)
Recent Publication: Valentini et al. (2007), ASPC 374,205; Valentini & Munari (2007), ASPC 374,203
Synthetic Spectra
A large library of synthetic spectra has been developed as
an efficient tool to interpret stellar spectra at high resolution.
At the moment the library comprises 51,288 spectra from 2500 to
10500 Å, computed with the most recent Opacity Distribution Functions,
and covering the whole HR diagram. The spectra are offered at different
dispersion and resolving powers. The library will be expanded to include
extremely low metallicities, and a range of micro-turbulent velocities and
alpha-enhancements. This is the reference library for automated analysis
of RAVE and ARCS survey spectra.