SIMBAD references

1997A&A...324.1059L - Astronomy and Astrophysics, volume 324, 1059-1070 (1997/8-3)

Optical and infrared observations of 23 carbon-rich stars. Modelling of the circumstellar dust shells.


Abstract (from CDS):

A study of circumstellar dust shells (CDS) around carbon stars is presented. This study is based on the analysis of the 1-100µm broad-band spectra of 23 objects which have been monitored in the 1-20µm region over several years at ESO. The sources in the sample range from Irr/SR variables and optical miras to Extreme Carbon Stars which have only been discovered recently in infrared surveys. A modelling accounting for the photometric variations with phase (with up to 9 spectra per object) has been developed. All the CDSs in the sample can be modelled successfully in spherical geometry with a dust opacity law ∝λ–1.3 and a dust formation temperature ∼950K. The modelling favors the case of an acceleration of dust, from the site of formation and on a distance of ∼1015cm, over the case of a uniform expansion. Mass loss rates in the range 0.1-50x10–6M/yr are derived. The estimates based on this modelling are consistent with those derived from the CO emission line measurements. In view of the incoming near-infrared surveys (DENIS and 2MASS), an analysis of the location of carbon-rich sources in color diagrams is presented. It is shown that the near-infrared colors are well correlated with the mass loss rate. This property can be used to get an estimate, within a factor 3, of this rate for carbon stars without a priori on the distance.

Abstract Copyright:

Journal keyword(s): radiative transfer - stars: carbon - (stars:) circumstellar matter - stars: mass loss - stars: AGB and post-AGB - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/324/1059): table2 table3 table4 tables.tex>

Simbad objects: 23

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