Interstellar extinction and the intrinsic spectral distribution of variable carbon stars.

Details Interstellar extinction and the intrinsic spectral distribution of variable carbon stars. Interstellar extinction and the intrinsic spectral distribution of variable carbon stars.

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321..236k&link_type=abstract

Astronomy and Astrophysics, v.321, p.236-244

Astronomy and Astrophysics

Astrophysics

12

Stars: Agb And Post-Agb, Stars: Carbon, Dust, Extinction

Scientific paper

We present a new method of evaluation of the extinction by interstellar dust on cool carbon variables. These late-type stars show no marked relationship between spectral classification (the R, N- and C-types) and photometric colour indices. The pair method is thus ruled out, at least in the form currently in use for early-type or intermediate stars. Our method makes use of the whole spectral energy distributions from UV to IR. A sample of 60 unreddened carbon variables is delineated and new colour-colour diagrams are proposed where the reddening vector is nearly perpendicular to their narrow intrinsic locus. Six photometric groups (or boxes : CV1 to 6) are derived among unreddened stars. They show a continuous range of spectral energy distributions from "bluer" to "redder", and mean colour indices are obtained. A pair method is described where each presumably reddened star is compared to these mean unreddened stars, a given extinction law being assumed. As an illustration, the results are shown for a sample of 133 well-documented stars. The mean extinction law usually adopted for the diffuse interstellar medium (R_V_=~3.1) is shown to provide good fits. The threshold for reddening detection turns to be E(B-V)=~0.02-0.03A good correlation is observed when the derived colour excesses are compared to values from maps in the literature. The mean rate of visual extinction amounts to =~1.25+/-1.1 , ranging from 0.37 near l=~240° (intercloud) to 2.1 (cloud + intercloud) in two structures correlated with Gould's belt.

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