Detection of a local high-velocity absorption-line system toward HD 93721

Details Detection of a local high-velocity absorption-line system toward HD 93721 Detection of a local high-velocity absorption-line system toward HD 93721

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..276p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 276-284.

Astronomy and Astrophysics

Astronomy

8

Absorption Spectra, Interstellar Matter, Stellar Composition, Stellar Spectra, Astronomical Spectroscopy, Calcium, Emission Spectra, Infrared Astronomy Satellite, Nebulae, Sky Surveys (Astronomy)

Scientific paper

Attention is given to high-resolution spectroscopic observations of the star HD 93721, which reveal the presence of at least 10 components of Ca II absorption, ranging in velocity from -65 to +75 km/s, for a total range of 140 km/s. Interstellar Ca II components with N(Ca II) ranging from 6 x 10 exp 10 to 9.0 x 10 exp 11/sq cm are observed, while spectroscopic observations of Na I absorption show a total of five interstellar components ranging in velocity from -58 to -13 km/s, with a total N(Na I) of 7.0 x 10 exp 11/sq cm. Low-resolution spectra for HD 93721 provide a spectral type of B9.5 III, which when combined with new photometry places the star at a distance of 410 +/- 50 pc. Examination of both optical and IR sky-survey plates reveals the location of the main absorbing cloud at the edge of an extended filament which may be associated with the interaction of a high-velocity cloud with the local interstellar medium in the vicinity of the Gum Nebula.

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