Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...195..413c&link_type=abstract
Astrophysical Journal, vol. 195, Jan. 15, 1975, pt. 1, p. 413-421.
Astronomy and Astrophysics
Astronomy
61
Binary Stars, Novae, Stellar Spectrophotometry, Variable Stars, Absorption Spectra, Astronomical Models, Balmer Series, Continuous Spectra, Emission Spectra, H Lines, Orbital Elements, Stellar Evolution, X Ray Astronomy
Scientific paper
A spectroscopic investigation of the rapid variable TT Ari reveals it to be a binary system with an orbital period of 0.1375 days. The spectrum is nearly continuous, with weak hydrogen emission lines superposed on shallow broad absorption. Broad C III and He II emission and narrower He I absorption are present, but very weak. The strength of the H emission is found to vary with the orbital phase, reaching a maximum intensity near quadrature (with the hot primary receding). The presence of a nonuniform, rotating ring surrounding the primary is inferred from the H emission lines. The complex light variations show a broad maximum during each orbital period, in addition to rapid flickering. This variation may be due to a hot spot in a ring or disk around the primary excited by infalling matter from the secondary. The inferred model of the system is similar to that derived for old novae.
Cowley Anne Pyne
Crampton David
Hutchings John B.
Marlborough J. M.
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