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American Astronomical Society, Astrophysical Journal, 1(750), p. 79, 2012

DOI: 10.1088/0004-637x/750/1/79

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Rotational Velocities of Individual Components in Very Low Mass Binaries

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present rotational velocities for individual components of eleven very low mass (VLM) binaries with spectral types between M7 and L7.5. These results are based on observations taken with the near-infrared spectrograph, NIRSPEC, and the Keck II laser guide star adaptive optics (LGS AO) system. We find that the observed sources tend to be rapid rotators (vsini > 10 km/s), consistent with previous seeing-limited measurements of VLM objects. The two sources with the largest vsini, LP 349-25B and HD 130948C, are rotating at ~30% of their break up speed, and are among the most rapidly rotating VLM objects known. Furthermore, five binary systems, all with orbital semi-major axes