Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204....1m&link_type=abstract
Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 1, p. 1-11.
Astronomy and Astrophysics
Astrophysics
112
H Lines, Hydrogen Clouds, Interstellar Gas, Molecular Spectra, Ultraviolet Absorption, Electron States, Far Ultraviolet Radiation, Molecular Oscillations, Molecular Rotation, Tables (Data), Ultraviolet Spectra
Scientific paper
This paper reports the measurement of some 136 interstellar H2 absorption lines found in a continuous scan of the far-ultraviolet spectrum of zeta Pup at 0.05-A resolution with the Copernicus telescope. Absorptions from only the rotational levels 0 to 5 of the lowest vibrational state of the ground electronic state were observed. The total H2 column density is 2.8 by 10 to the 14th power molecules/sq cm; the ratio of H nuclei in H2 to the number in H I plus molecules is 6 by 10 to the -6th power; the population of the rotational levels can be represented by a single excitation temperature of 1120 (plus or minus 80) K. The radial velocities of all rotational levels were the same within 7 km/s and differed from most atoms and first ions by no more than 4.5 km/s on the average. The tables also list the best available data on wavelengths, oscillator strengths, and radiative damping constants for all the H2 lines with zero vibrational level likely to be observed in the interstellar gas.
Dinerstein Harriet L.
Morton Donald C.
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