2002A&A...391..577S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST01:10:36

2002A&A...391..577S - Astronomy and Astrophysics, volume 391, 577-586 (2002/8-4)

Probing the mass loss history of carbon stars using CO line and dust continuum emission.

SCHOEIER F.L., RYDE N. and OLOFSSON H.

Abstract (from CDS):

An extensive modelling of CO line emission from the circumstellar envelopes around a number of carbon stars is performed. By combining radio observations and infrared observations obtained by ISO the circumstellar envelope characteristics are probed over a large radial range. In the radiative transfer analysis the observational data are consistently reproduced assuming a spherically symmetric and smooth wind expanding at a constant velocity. The combined data set gives better determined envelope parameters, and puts constraints on the mass loss history of these carbon stars. The importance of dust in the excitation of CO is addressed using a radiative transfer analysis of the observed continuum emission, and it is found to have only minor effects on the derived line intensities. The analysis of the dust emission also puts further constraints on the mass loss rate history. The stars presented here are not likely to have experienced any drastic long-term mass loss rate modulations, at least less than a factor of ∼5, over the past thousands of years. Only three, out of nine, carbon stars were observed long enough by ISO to allow a detection of CO far-infrared rotational lines.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: circumstellar matter - stars: late-type - stars: mass-loss - infrared: stars

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LEE 259 C* 03 26 29.5050382299 +47 31 48.463099623           N 165 0
2 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2134 0
3 V* RW LMi C* 10 16 02.2834693816 +30 34 18.977096332       15.27   C4,3e 379 0
4 V* Y CVn C* 12 45 07.8257032577 +45 26 24.898861195 14.03 7.41 4.87 3.12 1.74 C-N5 461 0
5 WOS 48 C* 15 23 05.0744336371 -51 25 58.881494593   17.85 16.66 14.51 10.18 C 118 1
6 V* V Cyg C* 20 41 18.2688237607 +48 08 28.886946369   14.05 7.70     C7,4eJ 290 0
7 V* S Cep C* 21 35 12.8240104870 +78 37 28.201592479   12.13 7.40     C7,3e 245 0
8 RAFGL 3068 C* 23 19 12.60744 +17 11 33.1332           C 249 0
9 IRC +40540 C* 23 34 27.5215563443 +43 33 01.299562617     15.12     C8,3.5eJ 170 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-01:10:36

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