Copernicus observations of neutral hydrogen and deuterium in the direction of HR 1099

Details Copernicus observations of neutral hydrogen and deuterium in the direction of HR 1099 Copernicus observations of neutral hydrogen and deuterium in the direction of HR 1099

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..431a&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Aug.-Sept. 1979, p. 431-435.

Other

5

Binary Stars, Interstellar Matter, Oao 3, H I Regions, Line Spectra, Lyman Alpha Radiation, Neutral Atoms, Stellar Spectrophotometry

Scientific paper

High-resolution Copernicus U1 scans were obtained of the bright RS CVn binary HR 1099 (d = 33 pc, galactic longitude = 185 deg, galactic latitude = -41 deg) in October 1977. Strong emission at L-alpha was detected. The interstellar L-alpha absorption features of H I and D I were also observed. Analyses of these interstellar lines are reported in this paper. The average density of neutral H in the direction of this system is found to be 0.006-0.012 per cu cm, which, because the local density is higher, requires a marked inhomogeneity along this line of sight. This result, when combined with other recent studies of the local interstellar medium, suggests the sun is located within a moderate-density H I region.

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