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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198647.0, MPI für Astronomie / Publikationen_mpia
Automated determination of stellar parameters
from simulated dispersed images for DIVA
Authors:Willemsen, P. G.; Bailer-Jones, C. A. L.; Kaempf, T. A.; de Boer, K. S.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:Astronomy and Astrophysics
Volume:401
Start Page:1203
End Page:1213
Sequence Number of Article:2003A&A...401.1203W
Review Status:not specified
Audience:Experts Only
Abstract / Description:We have assessed how well stellar parameters
(Teff, log g and [M/H]) can be
retrieved from low-resolution dispersed images to
be obtained by the DIVA satellite. Although DIVA
is primarily an all-sky astrometric mission, it
will also obtain spectrophotometric information
for about 13 million stars (operational limiting
magnitude V =~ 13.5 mag). Constructional studies
foresee a grating system yielding a dispersion of
=~ 200 nm/mm on the focal plane (first spectral
order). For astrometric reasons there will be no
cross dispersion which results in the overlapping
of the first to third diffraction orders. The
one-dimensional, \emph{position related}
intensity function is called a DISPI (DISPersed
Intensity). We simulated DISPIs from synthetic
spectra taken from Lejeune et al.
(\cite{basel97}) and Lejeune et al.
(\cite{basel98}) but for a limited range of
metallicites, i.e. our results are for [M/H] in
the range -0.3 to 1 dex. We show that there is no
need to deconvolve these low resolution signals
in order to obtain basic stellar parameters.
Using neural network methods and by including
simulated data of DIVA's UV telescope, we can
determine Teff to an average accuracy
of about 2
Free Keywords:astrometry; stars: fundamental parameters;
; methods: data analysis; techniques: spectroscopic
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Hügel 71, 53121 Bonn, Germany),
AB(Max-Planck-Institut für Astronomie,
Königstuhl 17, 69117 Heidelberg, Germany),
AC(Sternwarte der Universität Bonn, Auf dem
Hügel 71, 53121 Bonn, Germany), AD(Sternwarte
der Universität Bonn, Auf dem Hügel 71, 53121
Bonn, Germany)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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