Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..230b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 2, Nov. 1984, p. 230-242.
Astronomy and Astrophysics
Astrophysics
22
Absorption Spectra, Astronomical Spectroscopy, Hydrogen, Interplanetary Medium, Interstellar Gas, Lyman Alpha Radiation, Background Radiation, Celestial Sphere, Doppler Effect, Optical Thickness
Scientific paper
The use of a hydrogen absorption cell as a means of diagnostic for interstellar hydrogen is described. Through resonance scattering of solar Lyα photons, the interstellar atoms penetrating into the solar system present a Lyα emission the profile of which is an image of their velocity distribution. From the study of hydrogen Lyα profiles the temperature T of the interstellar hydrogen and the three components of the relative velocity vector Vw can be determined. The case in which the velocity distribution of H atoms in the interplanetary medium is the same Maxwell-Boltzmann distribution as at infinity (the uniform gaussian case) is completely described.
Bertaux Jean Loup
Lallement Rosine
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