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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 198565.0, MPI für Astronomie / Publikationen_mpia
Infrared properties of solid titanium oxides:
Exploring potential primary dust condensates
Authors:Posch, Th.; Kerschbaum, F.; Fabian, D.; Mutschke, H.; Dorschner, J.; Tamanai, A.; Henning, Th.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:The Astrophysical Journal Supplement Series
Journal Abbrev.:The Astrophysical Journal Supplement Series
Start Page:437
End Page:445
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present optical constants and opacities of
solid TiO2,
Ti2O3, magnesium and
calcium titanates, largely based on laboratory
measurements. These dust species deserve interest
as potential primary condensates in oxygen-rich
dusty environments. Of the three known solid
TiO2 phases, only one (rutile) has
been extensively studied so far with respect to
its mid-IR optical properties. We compare these
with our measurements of the optical constants of
anatase, brookite, and CaTiO3.
Furthermore, for several Mg-Ti-oxides, powder
transmission spectra are shown. While all known
TiO2 modifications have their
strongest bands between 13 and 13.5 µm (for
spherical particles), CaTiO3,
MgTiO3, and other Mg titanates have
principal maxima of their absorption coefficients
between 14 and 19 µm. This makes a spectroscopic
identification of circumstellar Ti oxide
particles rather difficult, because both the 13
and the 14-19 µm region are crowded with other
features in the spectra of oxygen-rich
circumstellar shells.
Free Keywords:Stars: Circumstellar Matter; Methods:
; Laboratory; Molecular Data; Solar System:
; Formation; Stars: AGB and Post-AGB; Stars: Mass
; Loss
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:17, A-1180 Wien, Austria;
AB(Institut für Astronomie, Türkenschanzstraße
17, A-1180 Wien, Austria;
AC(Astrophysikalisches Institut und
Universitätssternwarte, Schillergässchen 2-3,
D-07745 Jena, Germany), AD(Astrophysikalisches
Institut und Universitätssternwarte,
Schillergässchen 2-3, D-07745 Jena, Germany),
AE(Astrophysikalisches Institut und
Universitätssternwarte, Schillergässchen 2-3,
D-07745 Jena, Germany), AF(Zentrum für Astronomie
und Astrophysik, TU Berlin, Hardenbergstraße 36,
D-10623 Berlin, Germany), AG(Max-Planck-Institut
für Astronomie (MPIA), Königstuhl 17, D-69117
Heidelberg, Germany)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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