Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..267l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 1, p. 267-273
Astronomy and Astrophysics
Astrophysics
24
Data Reduction, Halos, Interstellar Gas, Radio Spectra, Spectroscopy, Stellar Spectra, Ultraviolet Spectra, Absorption Spectra, Charge Coupled Devices, Gas Density, Gas Temperature, Line Of Sight, Radial Velocity, Spectrometers, Supernova Remnants, Telescopes, Wavelengths
Scientific paper
High-resolution optical stellar and interstellar observations toward the halo star HD 203664 and six surrounding early-type stars have been combined with a 21 cm mapping of the region to investigate a 70 km s-1 between 200 and 1500 pc; upper limits to temperature and velocity dispersion of 4600 K and 2.2 km s-1 have been estimated; and a column density ratio N(Na II)/N (Ca II) approx. equal to 0.32 has been deduced. These parameters are consistent with the material being shocked gas, possibly arising from an old supernova remnant. The N(Na I)/N(H I) and N(Ca II)/N(H I) ratios are anomalously large by factors of approximately 20 and 100, respectively, with respect to normal diffuse gas; several scenarios are presented as possible explanations of this phenomenon.
Conlon E. S.
Davies Rhodri D.
Dufton Philip L.
Keenan Francis P.
Little J. E.
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