Other
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt........24h&link_type=abstract
Thesis (PhD). THE CATHOLIC UNIVERSITY OF AMERICA, Source DAI-B 60/09, p. 4657, Mar 2000, 170 pages.
Other
Scientific paper
During three consecutive orbital cycles, forty-two ultraviolet and thirty-nine near ultraviolet high- resolution spectra of the Algol-type interacting binary star system Delta (δ) Librae were obtained with the International Utraviolet Explorer (IUE) satellite. Atomic resonance lines of Si IV and C IV are present in absorption of weak to moderate strength from about phase 0.68 before primary eclipse through phase 0.16 following. The high- temperature pseudo-photospheric region which is found surrounding the equatorial regions of the primary detached star in all active Algol-type binaries is only partially present in δ Librae. This indicates δ Librae is semi-active exhibiting a low rate of mass flow from the secondary star, which is in contact with its critical equipotential surface. A model of the system presents new estimates of system dimensions and masses. It also presents a semi-quantitative morphology of the high temperature ionization region with temperature, density, and mass flow rate estimates. This region resembles the equatorial pseudo-photosphere seen in other Algol-type binaries, but is cooler. In addition, it only partially covers the equatorial region of the primary star in an apparently thin layer (<3% of primary radius) within about 80 degrees east of the longitude marking the line joining the stellar centers. The ionization region shows transient behavior as evidenced by the variation in Si IV and C IV line profiles and strengths within a cycle. Significant blending with photospheric Fe II lines required special care in measuring Si IV and C IV resonance line equivalent widths. A review of historical systematic radial velocity variations leaves open the possibility of a third star in the system.
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