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- W2046373150 abstract "view Abstract Citations (81) References (66) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Local Distribution of NA i Interstellar Gas Welsh, B. Y. ; Craig, N. ; Vedder, P. W. ; Vallerga, J. V. Abstract We present high-resolution absorption measurements (lambda/Delta lambda approximately 75,000) of the interstellar Na I D lines at 5890 A toward 80 southern hemisphere early-type stars located in the local interstellar medium (LISM). Combining these results with other sodium measurements taken from the literature, we produce galactic maps of the distribution of neutral sodium column density for a total of 293 stars generally lying within approximately 250 pc of the Sun. These maps reveal the approximate shape of the mid-plane contours of the rarefied region of interstellar space termed the Local Bubble. Its shape is seen as highly asymmetric, with a radius ranging from 30 to 300 pc, and with an average radius of 60 pc. Similar plots of the Galactic mid-plane distribution of sources emitting extreme ultraviolet radiation show that they also trace out similar contours of the Local Bubble derived from Na I absorption measurements. We conclude that the Local Bubble absorption interface can be represented by a hydrogen column density, NuETA = 2 x 1019 cm-2, which explains both the local distribution of Na I absorption and the observed galactic distribution of extreme ultraviolet sources. The derived mid-plane contours of the Bubble generally reproduce the large-scale features carved out in the interstellar medium by several nearby galactic shell structures. Publication: The Astrophysical Journal Pub Date: December 1994 DOI: 10.1086/175028 Bibcode: 1994ApJ...437..638W Keywords: Absorption Spectra; Abundance; Early Stars; Extreme Ultraviolet Radiation; High Resolution; Interstellar Gas; Sodium; Spatial Distribution; Astronomical Maps; Astronomical Observatories; Extreme Ultraviolet Explorer Satellite; Hydrogen; Iue; Least Squares Method; Rosat Mission; Astrophysics; ISM: ABUNDANCES; ISM: BUBBLES; ISM: STRUCTURE full text sources ADS | data products SIMBAD (289) MAST (1)" @default.
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- W2046373150 date "1994-12-01" @default.
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- W2046373150 title "The local distribution of NA I interstellar gas" @default.
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