High-resolution AO monitoring of Kelu-1 AB

Details High-resolution AO monitoring of Kelu-1 AB High-resolution AO monitoring of Kelu-1 AB

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..561s&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Astronomy and Astrophysics

Astronomy

3

Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Star Formation, Photometric, Polarimetric, And Spectroscopic Instrumentation

Scientific paper

We present multi-epoch near-infrared high-resolution VLT/NACO observations of the benchmark brown dwarf binary Kelu-1 AB. We have analyzed the first resolved spectra of the individual components. The primary itself seems to be an unresolved spectroscopic binary with spectral types L0.5+/-0.5 and T7.5+/-1, and the secondary is likely a L3 pec+/-1.5 with some remaining unexplained features. The obtained relative astrometric measurements over 3 years allowed an estimation of the orbital elements yielding an orbital period of 38-6+8 years and the first dynamical mass determination of 177-55+113 MJup. This total system mass is somewhat higher than the doubled upper mass limit for lithium burning and thus more than one would expect for a brown dwarf-brown dwarf binary system. Including a third component would solve this discrepancy.

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