C-rich stars IR and UBVRI photometry (Le Bertre 1997)

Details C-rich stars IR and UBVRI photometry (Le Bertre 1997) C-rich stars IR and UBVRI photometry (Le Bertre 1997)

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ycat..33241059l&link_type=abstract

VizieR On-line Data Catalog: J/A+A/324/1059. Originally published in: 1997A&A...324.1059L

Physics

Stars: Carbon, Photometry: Ubvri, Photometry: Infrared

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 ~1015cm, over the case of a uniform expansion. Mass loss rates in the range 0.1-50x10-6M&sun;/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. (3 data files).

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