Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..785l&link_type=abstract
Astronomy and Astrophysics, Vol. 274, NO. 3/JUL(III), P. 785, 1993
Astronomy and Astrophysics
Astrophysics
19
Stars: Circumstellar Matter, Stars: Binaries, Stars: Ty Cra
Scientific paper
We present high resolution spectroscopic observations of the Herbig star TY CrA in the Ca II K, Ca II triplet, Mg II, Ti II, Hα, He I, O I and Na I regions. Narrow absorption features (FWHM ≤ 50 km s-1 and sometimes as small as 8 km s-1) are observed in all these lines and have a variable radial velocity between -75 and +84 km s-1. We find that the velocity variations of all the narrow lines are periodic, with a period equal to the 2.888777d photometric period previously reported by Kardopolov et al. (1981). Our data thus provide the first direct evidence that TY CrA is a spectroscopic binary. We suggest two possible origins for these lines: 1) the narrow features are photospheric, implying that TY CrA is a late type (B7V) star with a very low ν.sini (≤ 6 km s-1) Since TY CrA is known to be an eclipsing binary with an orbital period close to 2.9 days (Kardopolov et al. 1981), such a small ν.sini indicates sub-synchroneous rotation; 2) TY CrA is a rapidly rotating B star (ν.sini ≥ 200 km s-1) surrounded by a gaseous disk or shell, in which most of the observed narrow lines form.
Bouvier Jerome
Corporon Patrice
Lagrange Anne Marie
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