On the existence of high-velocity gas in the direction of Delta SCO

Details On the existence of high-velocity gas in the direction of Delta SCO On the existence of high-velocity gas in the direction of Delta SCO

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176p..37b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 176, July 1976, p. 37P-43P. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

1

Abundance, Astronomical Spectroscopy, D Lines, Interstellar Gas, Gas Spectroscopy, Magnesium, Radial Velocity, Sodium, Ultraviolet Spectra

Scientific paper

Two high-radial-velocity components of the NaI(D2) line recently reported by Hicks et al. (1975) towards Delta Sco are not observed in the ultraviolet Mg I and Mg II lines along the same line of sight. Several physical situations are considered in an attempt to explain the anomalously low Mg I/NaI column-density ratio implied by the observations. It is concluded that if these features are not of a time-dependent nature, then Mg is underabundant with respect to Na by at least an order of magnitude in the high-velocity components, in contrast with previous general findings.

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