High-Resolution Observations of Interstellar C 2 Toward zeta Ophiuchi

Details High-Resolution Observations of Interstellar C 2 Toward zeta Ophiuchi High-Resolution Observations of Interstellar C 2 Toward zeta Ophiuchi

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...460l..61s&link_type=abstract

Astrophysical Journal Letters v.460, p.L61

Astronomy and Astrophysics

Astronomy

6

Ism: Molecules, Line: Profiles, Stars: Individual Constellation Name: Zeta Ophiuchi

Scientific paper

We present high-resolution ( lambda / Delta lambda ~ 540,000) absorption-line observations of two weak C2 lines in the 2--0 band of the Phillips system in the direction of zeta Ophiuchi. These high signal-to-noise ratio (S/N ~ 230--380) data were obtained at the McDonald Observatory 2.7 m telescope using the coude echelle spectrograph in double-pass mode. The C2 line profiles are resolved into two components, having a spacing of ~1.14 km s-1, as has been seen for other molecular species such as CN, CO, and CH. Unlike these molecules, however, the strengths of the two narrow C2 components are very similar. We briefly discuss the implications these results have for understanding the chemical behavior of diatomic molecules in diffuse interstellar clouds.

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