Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310..228c&link_type=abstract
Astronomy and Astrophysics, v.310, p.228-234
Astronomy and Astrophysics
Astrophysics
23
Stars: Individual: Ty Cra, Stars: Pre-Main Sequence, Stars: Emission-Line, Be, Binaries: Spectroscopic
Scientific paper
The pre-main sequence star TY CrA is an eclipsing multiple system; in addition to the spectroscopic signatures of the primary and the secondary, lines from a third component were recently detected. Here we present high resolution spectra of the Li I 6708A, [S II] 6716,6731A, and [O I] 6300A lines of the TY CrA system. [S II] and [O I] lines are undoubtedly detected in the visible spectrum of TY CrA. Their origin remains uncertain, but they might be due to the tertiary component. A long-term monitoring of the Li I lines of the tertiary component allows us to derive its orbital motion around the binary system. We propose a possible fit for the orbit of this third component, and estimate its dynamical and physical attributes. In particular, the orbit of the tertiary appears eccentric (e=~0.5) and highly inclined (~70deg) with respect to the orbital plane of the close binary.
Beust Hervé
Corporon Patrice
Lagrange Anne Marie
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