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

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

2002-09-09

arxiv.org/abs/astro-ph/0209144v1

Astron.Astrophys. 395 (2002) 877-884

Astronomy and Astrophysics

Astrophysics

A&A in press

Scientific paper

10.1051/0004-6361:20021345

We present JHK images of the young (~20 Myrs) nearby (~48 pc) stars HD 199143 and HD 358623 to search for (sub-)stellar companions around them. The images were obtained in JHK with the speckle camera SHARP-I in July 2001 and in H with SofI in Dec 2000, July 2001, and Dec 2001, all at the ESO 3.5m NTT. We present a companion candidate with a 2 arc sec offset being almost 2 mag fainter than HD 358623 with proper motion consistent with the known proper motion of the primary star HD 358623 A. Then, we obtained a spectrum in the H-band (with SofI at 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 companion candidate with a 1 arcsecond offset being 2 mag fainter than HD 199143 is detected. The JHK colors of this candidate are consistent with a spectral type M0-2. We determine the ages and masses of all four objects from theoretical tracks and isochrones, all four stars appear to be co-eval with ~20 Myrs. Our limits for additional detectable but undetected companions are such that we would have detected all stellar companions with separations > 0.5 arc sec (24 AU at 48 pc).

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