Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333..943m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. 943-952.
Astronomy and Astrophysics
Astrophysics
30
H Alpha Line, Speckle Interferometry, Stellar Luminosity, Stellar Mass, Stellar Rotation, Triple Stars, Radial Velocity, Spectral Resolution, Stellar Models, Stellar Spectra
Scientific paper
G208-44AB/45, the second nearest triple system, consists of three very low mass, probably stellar, components near or below 0.1 M_sun;. The close astrometric pair 44AB has been imaged directly by speckle interferometry in the JHK bands, yielding individual masses of 0.14±0.03 M_sun; and 0.10±0.02 M_sun; for A and B, respectively. The absolute K magnitudes are 8.9 and 10.0, respectively, while the distant component 45 has K = 9.1. Spectroscopic observations determine spectral types of M6 eV for 44AB and 45 and show evidence of flaring activity in both objects. Radial velocity measurements and the broadening of absorption lines in 44AB indicate stellar rotation (v sin i ≡ 18.3 km s-1). The system kinematics, large implied rotation rate of 44AB, and level of chromospheric activity in the wide component suggest that the system is relatively young (age < 2 Gyr).
Christou Julian C.
Fleming Thomas Anthony
Henry Todd J.
Liebert James
McCarthy Donald W. Jr.
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