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The multiplicity of exoplanet host stars. New low-mass stellar companions of the exoplanet host stars HD 125612 and HD 212301
Aims: We present new results from our ongoing multiplicity study ofexoplanet host stars, carried out with SofI/NTT. We provide the mostrecent list of confirmed binary and triple star systems that harborexoplanets. Methods: We use direct imaging to identify widestellar and substellar companions as co-moving objects to the observedexoplanet host stars, whose masses and spectral types are determinedwith follow-up photometry and spectroscopy. Results: We found twonew co-moving companions of the exoplanet host stars HD 125612 and HD212301. HD 125612 B is a wide M 4 dwarf (0.18 M_ȯ) companion of theexoplanet host star HD 125612, located about 1.5 arcmin (~4750 AU ofprojected separation) south-east of its primary. In contrast, HD 212301B is a close M 3 dwarf (0.35 M_ȯ), which is found about 4.4 arcsec(~230 AU of projected separation) north-west of its primary. Conclusions: The binaries HD 125612 AB and HD 212301 AB are newmembers in the continuously growing list of exoplanet host star systemsof which 43 are presently known. Hence, the multiplicity rate ofexoplanet host stars is about 17%.Based on observations obtained on La Silla in ESO programs079.C-0099(A), 080.C-0312(A).
| UBV(RI)c photometry for CaII emission stars. II - Observations at Mt. John University Observatory and at Mt. Stromlo
UBV(RI)c data are given for 17 stars with strong Ca II H and K emission.Techniques of observation and reduction are described briefly.
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