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We present JHK images of the young (~20 Myrs) nearby (~48 pc) stars HD 199143and HD 358623 to search for (sub-)stellar companions around them. The imageswere obtained in JHK with the speckle camera SHARP-I in July 2001 and in H withSofI in Dec 2000, July 2001, and Dec 2001, all at the ESO 3.5m NTT. We presenta companion candidate with a 2 arc sec offset being almost 2 mag fainter thanHD 358623 with proper motion consistent with the known proper motion of theprimary star HD 358623 A. Then, we obtained a spectrum in the H-band (with SofIat the NTT) of this companion showing that it has spectral type M1-3,consistent with being a companion of HD 358623 A (K7-M0). Also, a companioncandidate with a 1 arcsecond offset being 2 mag fainter than HD 199143 isdetected. The JHK colors of this candidate are consistent with a spectral typeM0-2. We determine the ages and masses of all four objects from theoreticaltracks and isochrones, all four stars appear to be co-eval with ~20 Myrs. Ourlimits for additional detectable but undetected companions are such that wewould have detected all stellar companions with separations > 0.5 arc sec (24AU at 48 pc).Comment: A&A in pres

Infrared imaging and spectroscopy of companion candidates near the young stars HD 199143 and HD 358623 in Capricornius