Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324.1059l&link_type=abstract
Astronomy and Astrophysics, v.324, p.1059-1070
Astronomy and Astrophysics
Astrophysics
61
Radiative Transfer, Stars: Carbon, (Stars:) Circumstellar Matter, Stars: Mass Loss, Stars: Agb And Post-Agb, Infrared: Stars
Scientific paper
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 {prop.to}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 ~10^15^cm, over the case of a uniform expansion. Mass loss rates in the range 0.1-50x10^-6^Msun_/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.
No associations
LandOfFree
Optical and infrared observations of 23 carbon-rich stars. Modelling of the circumstellar dust shells. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Optical and infrared observations of 23 carbon-rich stars. Modelling of the circumstellar dust shells., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical and infrared observations of 23 carbon-rich stars. Modelling of the circumstellar dust shells. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1877725