Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...261..617g&link_type=abstract
Astrophysical Journal, Part 1, vol. 261, Oct. 15, 1982, p. 617-624.
Astronomy and Astrophysics
Astrophysics
17
Binary Stars, Novae, Orbit Calculation, Stellar Spectra, Variable Stars, Absorption Spectra, Astronomical Photometry, Emission Spectra, Line Spectra, Radial Velocity, Spectrum Analysis
Scientific paper
High time resolution spectroscopy has been used to determine an orbital period of 10.9 hr for QU Carinae (= HDE 310376). The spectrum shows moderate He II 4686 and C III-N III 4630-4660 emission with weak and variable Balmer-line absorption and emission. The 4630-4660 feature is centered at 4648 A, which rules out Bowen fluorescence or dielectronic recombination of N III as the dominant production mechanism. The C III-N III feature most likely results from nonselective emission and may be indicative of high C and N abundances. The contributions of C and N to the 4630-4660 feature are 75% and 25%, respectively, with negligible O II contribution. Although QU Car has a relatively long orbital period of 10.9 hr determined from radial velocities of He II emission, no evidence of an absorption-line spectrum from an expected G-K spectral type secondary component is seen. A bolometric magnitude of not greater than approximately 2.2 for the system is inferred from the lack of secondary lines. High-speed photometry confirms variations of 0.1-0.2 mag on time scales of minutes.
Gilliland Ron L.
Phillips Marcia
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