SIMBAD references

2002ApJ...567L.133P - Astrophys. J., 567, L133-L136 (2002/March-2)

Hokupa'a-Gemini discovery of two ultracool companions to the young star HD 130948.

POTTER D., MARTIN E.L., CUSHING M.C., BAUDOZ P., BRANDNER W., GUYON O. and NEUHAEUSER R.

Abstract (from CDS):

We report the discovery of two faint ultracool companions to the nearby (d∼17.9 pc) young G2 V star HD 130948 (HR 5534, HIP 72567) using the Hokupa'a adaptive optics (AO) instrument mounted on the Gemini North 8 m telescope. Both objects have the same common proper motion as the primary star as seen over a 7 month baseline and have near-IR photometric colors that are consistent with an early L classification. Near-IR spectra taken with the NIRSPEC AO instrument on the Keck II telescope reveal K I lines, FeH, and H2O band heads. Based on these spectra, we determine that both objects have a spectral type of dL2 with an uncertainty of two spectral subclasses. The position of the new companions on the H-R diagram in comparison with theoretical models is consistent with the young age of the primary star (<0.8 Gyr) estimated on the basis of X-ray activity, lithium abundance, and fast rotation. HD 130948B and C likely constitute a pair of young contracting brown dwarfs with an orbital period of about 10 yr and will yield dynamical masses for L dwarfs in the near future.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Stars: Binaries: Visual - Stars: Evolution - Stars: Fundamental Parameters - Stars: Imaging - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 13

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