First results from the GHRS: element abundances as a function of velocity in the neutral gas toward ξ Persei.

Details First results from the GHRS: element abundances as a function of velocity in the neutral gas toward ξ Persei. First results from the GHRS: element abundances as a function of velocity in the neutral gas toward ξ Persei.

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991frfg.book.....s&link_type=abstract

First results from the GHRS: element abundances as a function of velocity in the neutral gas toward ξ Persei., by Savage, B. D.;

Astronomy and Astrophysics

Astrophysics

Scientific paper

Observations of ultraviolet interstellar absorption lines toward ξ Persei (HD 24912) obtained with the Echelle mode of the Goddard High Resolution Spectrograph (GHRS) aboard the Hubble Space Telescope at a resolution of 3.5 km s-1 are presented. The data for O I, C II, Mg II, S II, Fe II, Si II, Mn II, and Zn II are converted into representations of apparent column density per unit velocity, Na(v), over the velocity range from -30 to +40 km s-1. The profiles for ions that are the dominant state of ionization in neutral clouds permit a study of the variation of element abundance with velocity caused by changes in the gas phase depletion in the different absorbing regions situated toward ξ Per. In the denser portions of the diffuse clouds with v ≡ +5 to 15 km s-1 heavy element depletions are very large. However, in absorbing components near -5 and +25 km s-1, the depletions are less severe, with a nearly solar gas phase abundance ratio being found for the gas in the +25 km s-1 component. The measurements confirm that the GHRS is well suited for diagnostic spectroscopy of interstellar gas.

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