Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309l..27c&link_type=abstract
Astronomy and Astrophysics, v.309, p.L27-L30
Astronomy and Astrophysics
Astrophysics
68
Stars: Molecular Data, Stars: Agb, Circumstellar Matter, Ism: Molecules, Radio Lines: Stars
Scientific paper
Searching for C_7_H and C_8_H in the carbon star envelope IRC+10216, we have identified 10 lines with harrnonically related frequencies and with regularly increasing intensities (3 lines in the IRAM 3mm spectral survey and 7 lines in the 7mm Nobeyama survey of Kawaguchi et al., 1995). The rest frequencies can be closely fitted with the standard expression for the energies of a linear molecule with a rotational constant B=586.676MHz, a distortion constant D=6.3Hz, and half-integer quantum numbers J. The value of B is within 0.1% of that predicted by Pauzat et al. (1991) for the ^2PI ground state of C_8_H and the value of D typical of a linear acetylenic chain of C_8_H's weight. Since the half-integer J numbers are also consistent with a ^2PI state, we concluded that we had very probably discovered C_8_H. In the an accompanying Letter, McCarthy et al. report the detection of 30 lines of our new radical in an acetylene discharge and confirm they arise from C_8_H.
Cernicharo Jose
Guélin Michel
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