Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..473w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. 473-484.
Astronomy and Astrophysics
Astrophysics
55
Absorption Spectra, Early Stars, Interstellar Matter, Sodium, Velocity Distribution, Astronomical Coordinates, Electron Density (Concentration), High Resolution, Interstellar Gas, Spatial Distribution
Scientific paper
High-resolution observations of the sodium D1 and D2 interstellar absorption lines have been made toward 19 stars in the local ISM at distances ranging from 20 to 220 pc. A least-squares absorption line-fitting analysis is carried out on 10 of the stars that show detectable sodium. The velocity structure, velocity dispersions, and column densities of the various interstellar cloud components are derived. For the majority of stars, the best-fit dispersion parameter is about 2 km/s, corresponding to an upper limit for the kinetic temperature of the interstellar gas of about 5500 K. No sodium is detected toward stars with distances less than 42 pc, placing an upper limit 2.5 x 10 to the 18th/sq cm to the hydrogen column density in these lines of sight.
Vallerga John V.
Vedder Peter W.
Welsh Barry Y.
No associations
LandOfFree
High-resolution sodium absorption-line observations of the local interstellar medium does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High-resolution sodium absorption-line observations of the local interstellar medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-resolution sodium absorption-line observations of the local interstellar medium will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1124995