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J/A+A/390/511  Millimetre observations of carbon stars. II. (Groenewegen+, 2002)

Millimetre observations of infrared carbon stars. II. Mass loss rates and expansion velocities. Groenewegen M.A.T., Sevenster M., Spoon H.W.W., Perez I. <Astron. Astrophys. 390, 511 (2002)> =2002A&A...390..511G
ADC_Keywords: Stars, carbon ; Infrared sources ; Mass loss ; Radial velocities Keywords: circumstellar matter - stars: mass loss - stars: AGB and post-AGB - radio lines: stars 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 5.5kpc. 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 -0.034dex/kpc, well within the quoted range of values in the literature. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 74 331 Data on the stars used in this study
See also: J/A+A/390/501 : Millimetre observations of carbon stars. I (Groenewegen+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- IRAS IRAS name 12- 16 F5.1 deg GLON Galactic longitude 18- 22 F5.1 deg GLAT Galactic latitude 24- 27 F4.1 km/s Vexp ? Expansion velocity 29- 33 F5.1 km/s Vlsr Radial velocity, with respect to the LSR 35- 38 F4.2 mag mbol Apparent bolometric magnitude 40- 44 F5.2 mag Mbol Absolute bolometric magnitude 46- 49 F4.2 kpc Dist Distance 51- 59 E9.3 solMass/yr dMgas/dt ? Gas mass-loss rate 61- 69 E9.3 solMass/yr dMdust/dt ? Dust mass-loss rate 71- 74 I4 --- Gas/Dust ? Gas-to-dust ratio, (dMg/dt)/(dMd/dt)
History: From electronic version of the journal * 23-Aug-2002: 27 IRAS names were in error and have been corrected, following a mail exchange with the main author (Martin Groenewegen)
(End) Patricia Bauer [CDS] 16-Jul-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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