Space Telescope Imaging Spectrograph Observations of the Interstellar Velocity Structure and Chemical Composition toward the Carina Nebula

Details Space Telescope Imaging Spectrograph Observations of the Interstellar Velocity Structure and Chemical Composition toward the Carina Nebula Space Telescope Imaging Spectrograph Observations of the Interstellar Velocity Structure and Chemical Composition toward the Carina Nebula

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...492l.169w&link_type=abstract

Astrophysical Journal Letters v.492, p.L169

Astronomy and Astrophysics

Astronomy

15

Ism: Structure, Ism: Individual Ngc Number: Ngc 3372, Ism: Abundances, Ultraviolet: Ism

Scientific paper

We have observed the O-type star CPD -59 deg2603 in the Carina Nebula with the Space Telescope Imaging Spectrograph near-UV and far-UV high-resolution echelles, at a resolving power of ~110,000 (FWHM) and S/N ~ 30. This sight line has complex velocity and excitation structure in the interstellar absorption lines, corresponding to three distinct regions: very high velocity components formed within the nebula; a warm, expanding H II region; and cool, low-velocity gas near the Sun. The Mg I and Mg II profiles show many components, with velocities extending from -235 to +123 km s-1. We have derived physical conditions in the expanding H II region from the Si IV doublet and the excited fine-structure lines of C I. Heavy elements (O, Ni, Cu, Ga) are present in the low-velocity gas, and their abundances indicate depletions consistent with nearby, cool diffuse clouds. 12CO is detected in just one low-velocity component, suggesting different amounts of processing among the clouds near the Sun.

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