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

D Baines, RD Oudmaijer, A Mora, C Eiroa, John M Porter, B Merín, B Montesinos, D de Winter, Andrew Collier Cameron, JK Davies, HJ Deeg, R Ferlet, F Garzon, CA Grady, AW Harris, MG Hoare, Keith Douglas Horne, SL Lumsden, LF Miranda, J PalaciosA Penny, A Quirrenbach, H Rauer, J Schneider, E Solano, PR Wesselius

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)697-704
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume353
Issue number2
DOIs
Publication statusPublished - 11 Sept 2004

Keywords

  • techniques : spectroscopic
  • binaries : spectroscopic
  • stars : individual : HK Ori
  • stars : pre-main-sequence
  • T-TAURI STARS
  • HERBIG AE/BE STARS
  • VEGA-TYPE
  • EMISSION
  • ACCRETION
  • SEARCH
  • VARIABILITY
  • ORIONIS
  • DUST
  • AE

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