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J/A+A/376/997       Galactic mass-losing AGB stars            (Le Bertre+, 2001)

Galactic mass-losing AGB stars probed with the IRTS. I. Le Bertre T., Matsuura M., Winters J.M., Murakami H., Yamamura I., Freund M., Tanaka M. <Astron. Astrophys. 376, 997 (2001)> =2001A&A...376..997L
ADC_Keywords: Stars, carbon ; Mass loss ; Infrared sources ; Stars, distances Keywords: stars: carbon - stars: mass-loss - stars: AGB and post-AGB - ISM: evolution - galaxy: solar neighbourhood - infrared: stars Abstract: AGB mass-losing sources are easy to identify and to characterize in the near-infrared range (1-5µm). We make use of the near-infrared data acquired by the Japanese space experiment IRTS to study a sample of sources detected in the 2 celestial strips surveyed by the IRTS. Mass-loss rates and distances are estimated for 40 carbon-rich sources and 86 oxygen-rich sources of which 8 are probably of S-type. Although the sample is small, one sees a dependence of the relative contribution of the two kinds of sources to the replenishment of the interstellar medium (ISM) on the galactocentric distance. E.g. from 6 to 8kpc, oxygen-rich sources in our sample contribute 10-12 times as much as carbon rich sources, whereas from 10 to 12kpc, the latters contribute 3-4 times as much as the formers. Therefore, one would expect a gradient in the composition of the ISM between 6 and 12kpc from the Galactic Centre, especially in its dust component. Most of the replenishment (>50%) by AGB stars is due to sources with mass-loss rate larger than 10-6M/yr. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 51 126 Properties of the 126 selected mass-losing AGB sources
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [LMW2001] Sequential number 5- 14 A10 --- IRAS IRAS name 16- 20 F5.2 mag [2.20] The [2.20] magnitude (1) 22- 25 F4.2 mag [2.20-3.77] The [2.20-3.77] colour index (1) 27- 30 I4 pc DSun Distance to the sun 32- 36 I5 pc z Distance above the Galactic plane 38- 42 F5.2 kpc DGC Distance to the Galactic Center 44- 49 F6.3 [10-6solMass/yr] log(dM/dt) Mass-loss rate 51 A1 --- Comp [OC] Composition (2)
Note (1): The magnitudes and colours are corrected for reddening. [2.20] is the flux at 2.20µm, [3.77] the flux at 3.77µm. Note (2): (C) stands for a carbon-rich composition and (O), for an oxygen-rich composition.
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 11-Oct-2001
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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