Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...455..590w&link_type=abstract
Astrophysical Journal v.455, p.590
Astronomy and Astrophysics
Astronomy
11
Stars: Binaries: Visual, Stars: Individual Henry Draper Number: Hd 72127, Ism: Abundances, Ism: Individual Name: Vela Supernova Remnant
Scientific paper
Spectra with a resolution of 20,000 obtained with the Goddard High Resolution Spectrograph on board Hubble Space Telescope show substantial differences in the interstellar absorption features for two stars, HD 72127A and B, despite their small separation of 4'S. Some of the material that produces these features is associated with shocked clouds in the Vela supernova remnant.
While the various components of the strong atomic features were not resolved, C I lines are weak enough to be resolved into three components in star A but only one in star B, all of which showed lines from the excited fine-structure states. Their analysis along with that of the excited fine-structure transitions of O I and Si II yielded local temperatures T and pressures p/k in each cloud. Two components of differing velocities, one in star A and one in star B, indicate that T is of order 100-200 K, and p/k ranges from about 105.5 to over 106 cm-3 K. These components thus appear to be due to shocked and compressed clouds, while other ones that indicate much lower temperatures and pressures are consistent with conditions in the general interstellar medium.
A comparison of velocities shows that the C I clouds and Ca II components, as observed in 1988, correspond quite well. Lines of Ge II and P II are seen in star A but seem to be significantly weaker in star B, though weak lines of Mg II indicate the same column density of Mg II in both stars.
The data serve as a baseline for future possible changes in the interstellar spectra, as have been monitored in Ca II between 1977 and 1988. HD 72127A was found to have a changing stellar velocity and is probably a single-line spectroscopic binary; its companion is likely to be of type B8 V.
Jenkins Edward B.
Vanture Andrew
Wallerstein George
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