ɛ Indi Ba, Bb: a spectroscopic study of the nearest known brown dwarfs

King, Robert R.; McCaughrean, Mark J.; Homeier, Derek; Allard, France; Scholz, Ralf-Dieter; Lodieu, Nicolas
Bibliographical reference

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun. AIP Conference Proceedings, Volume 1094, pp. 537-540 (2009).

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2
2009
Number of authors
6
IAC number of authors
1
Citations
2
Refereed citations
1
Description
The discovery of V Indi Ba and Bb, a nearby binary brown dwarf system with a main-sequence companion, allows a concerted campaign to characterise the physical parameters of two T dwarfs providing benchmarks against which atmospheric and evolutionary models can be tested. Some recent observations suggest the models at low mass and intermediate age may not reflect reality with, however, few conclusive tests. We are carrying out a comprehensive characterisation of these, the nearest known brown dwarfs, to allow constraints to be placed upon models of cool field dwarfs. We present broadband photometry from the V-to M'-band and the individual spectrum of both components from 0.6-5.1 μm at a resolution of up to R~5000. A custom analytic profile fitting routine was implemented to extract the blended spectra and photometry of both components separated by ~0.7''. We confirm the spectral types to be T1 and T6, and notably, we do not detect lithium at 6708Å in the more massive object which may be indicative both of the age of the system and the mass of the components.