The pre-main-sequence binary HK Ori: spectro-astrometry and EXPORT data

Baines, D.; Oudmaijer, R. D.; Mora, A.; Eiroa, C.; Porter, John M.; Merín, B.; Montesinos, B.; de Winter, D.; Collier Cameron, A.; Davies, J. K.; Deeg, H. J.; Ferlet, R.; Grady, C. A.; Harris, A. W.; Hoare, M. G.; Horne, K.; Lumsden, S. L.; Miranda, L. F.; Penny, A.; Quirrenbach, A.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 353, Issue 2, pp. 697-704.

Fecha de publicación:
9
2004
Número de autores
20
Número de autores del IAC
1
Número de citas
23
Número de citas referidas
21
Descripción
In this paper we present multi-epoch observations of the pre-main-sequence binary HK Ori. These data have been drawn from the EXPORT data base 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 milliarcsecond scales and confirms the speckle interferometric results from Leinert et al. The spectro-astrometry allows the identification, with fair certainty, of the active star within the binary, which we suggest to be a G-type T Tauri star based on its spectral characteristics.