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Title: Millimetre observations of infrared carbon stars - II. Mass loss rates and expansion velocities
Authors: Groenewegen, Martin ×
Sevenster, M
Spoon, HWW
Perez, I #
Issue Date: 2002
Publisher: E D P SCIENCES
Series Title: Astronomy & Astrophysics vol:390 issue:2 pages:511-522
Conference: date:ICC, PACS, Inst Sterrenkunde, B-3001 Heverlee, Belgium; Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Weston, ACT 2611, Australia; Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands; Univ Chile, Dept Astron, Santiago, Chile
Abstract: Dust- and gas mass loss rates and distances are determined for a sample of about 330 infra-red carbon stars that probe a distance up to about 5.5 kpc. The dependence of the dust- and gas mass loss rates, and the expansion velocity upon galactic longitude (l) are studied. It is found that the expansion velocity significantly depends on l, but that the absolute bolometric magnitude, the dust mass loss rate and the gas-to-dust ratio depend on l marginally, if at all, and the gas mass loss rate does not depend on l. Beyond the solar circle, the expansion velocity (as well as the luminosity, dust-to-gas ratio, dust mass loss rate) is lower than inside the solar circle, as expected from the overall gradient in metallicity content of the Galaxy. Combining the average expansion velocity inside and beyond the solar circle with the theoretically predicted relation between expansion velocity and gas-to-dust ratio, we find that the metallicity gradient in the solar neighbourhood is about 0:034 dex/kpc, well within the quoted range of values in the literature.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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