Lutraviolet Absorption lines from high-velocity gas in the vela supernova Remnant: new insights from space telescope imaging spectrograph Echelle observations of HD 72089

摘要

The star HD 72089 is located behind the Vela supernova remnant and shows a complex array of high- and low-velocity interstellar absorption features arising from shocked clouds. A spectrum of this star was recorded over the wavelength range 1196.4- 1397.2 A at a resolving power of λ/△λ= 110,000 and a signal-to-noise ratio of 32 by the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We have identified seven narrow components of C I and have measured their relative populations in excited fine-structure seven features at heliocentric velocities ranging from -70 to 130 km~-1 are seen in C II, N I, O I, Si II, S II, and Ni II.