Probing the IRC+10 ° 216 circumstellar envelope using spectroscopic observations of background stars

Details Probing the IRC+10 ° 216 circumstellar envelope using spectroscopic observations of background stars Probing the IRC+10 ° 216 circumstellar envelope using spectroscopic observations of background stars

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.289..203k&link_type=abstract

Astrophysics and Space Science, v. 289, Issue 3, p. 203-206 (2004).

Astronomy and Astrophysics

Astrophysics

4

Irc +10° 216, Carbon Stars, Circumstellar Matter, Ism: Molecules

Scientific paper

A unique and novel set of observations has been undertaken to study the circumstellar envelope (CSE) of the nearby (130 pc) carbon star IRC +10° 216 using optical absorption spectroscopy towards twobackground stars lying beyond the envelope.The primary aim of the observations is to search for diffuse band (DIB)carriers in the CSE. The circumstellar H+2H2column density expected along the line of sight towards the targets islarge compared to that derived from the small interstellar reddening inthis region, E B-V< 0.03 mag. We summarise our mainfindings, already reported in Kendall et al. (2002): The 6284Å DIB is detected in the VLT/UVES spectrum of one target, but clearly arises inthe foreground ISM. No other DIB is seen. Hence the DIB carriers, if present in the CSE, have a low abundance relative to H in the C-rich envelope of IRC +10°216, in comparison with this ratio in theISM. An important new result, previously unreported, concerns the detectionof circumstellar C2 via absorption of the Phillips bandnear 8760Å.

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