Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-24
Astronomy and Astrophysics
Astrophysics
MNRAS in press 8 pages 7 figures
Scientific paper
10.1111/j.1365-2966.2004.08104.x
In this paper we present multi-epoch observations of the pre-main sequence binary HK Ori. These data have been drawn from the EXPORT database and are complemented by high quality spectro-astrometric data of the system. The spectroscopic data appear to be very well represented by a combination of an A dwarf star spectrum superposed on a (sub-)giant G-type spectrum. The radial velocity of the system is consistent with previous determinations, and does not reveal binary motion, as expected for a wide binary. The spectral, photometric and polarimetric properties and variability of the system indicate that the active object in the system is a T Tauri star with UX Ori characteristics. The spectro-astrometry of HK Ori is sensitive down to milli-arcsecond scales and confirms the speckle interferometric results from Leinert et al. The spectro-astrometry allows with fair certainty the identification of the active star within the binary, which we suggest to be a G-type T Tauri star based on its spectral characteristics.
Baines Deborah
collaboration the EXPORT
Eiroa Carlos
Mora Alcione
Oudmaijer Rene D.
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