The interstellar D1 line at high resolution

Details The interstellar D1 line at high resolution The interstellar D1 line at high resolution

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9026737h&link_type=abstract

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Computer Science

Cygnus Constellation, High Resolution, Hyperfine Structure, Interstellar Matter, Light Curve, Spectral Resolution, Absorption Spectra, Charge Coupled Devices, Echelle Gratings, Reflectors

Scientific paper

Observations at a resolving power or a velocity resolution are reported of the interstellar D1 line of Na I in the spectra of gamma Cas, delta Ori, epsilon Ori, pi Sco, delta Cyg, and alpha Cyg. An echelle grating was used in a double-pass configuration with a CCD detector in the coude spectrograph of the 2.7 m reflector at McDonald Observatory. At least 42 kinematically distinct clouds are detected along the light paths to the five more distant stars, in addition to a single cloud seen toward delta Cyg. The absorption lines arising in 13 of the clouds are sufficiently narrow and unblended to reveal clearly resolved hyperfine structure components split by 1.05 km/s. An additional 13 clouds apparently show comparably narrow, but more strongly blended, lines. For each individual cloud, upper limits Tmax and (vt)max on the temperature and the turbulent velocity, respectively, are derived by fitting the observed lines with theoretical absorption profiles.

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