Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..395j&link_type=abstract
In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 395-39
Astronomy and Astrophysics
Astrophysics
12
Companion Stars, Stellar Spectra, Ultraviolet Spectra, White Dwarf Stars, Iue, Lyman Alpha Radiation, Stellar Luminosity, Stellar Magnitude, Technetium
Scientific paper
While investigating the ultraviolet spectra of S stars, a hot compact companion to the MS star 4 omicron1 Ori was discovered. Fitting the continuum and L alpha profile to models and IUE observations of other white dwarfs, it is shown to be a DA3 star with Teff = 22,000 K. Assuming a luminosity equal to the field DA stars, M = -0.7 for the primary, somewhat fainter than M = -1.2 to -1.4 from other calibrations. In most respects, o1 Ori is an ordinary MS star, with typical values for the Ti/Zr, Li/Ca and Ti isotope ratios. One outstanding difference is the presence of Tc, which is not found in other non-Mira MS and S stars, but the secondary is not likely to be the source. Upper detection limits for hot companions to other bright MS stars are derived: HR 363, RS Cnc, ST Her and OP Her. The nondetection of evolved companions for these stars is consistent with the statistics of field giant binaries.
Ake Thomas B.
Johnson Hollis R.
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