G. Fritz Benedict et al. 2000 The Astronomical Journal 120 1106 doi:10.1086/301495
Interferometric Astrometry of the Low-Mass Binary Gl 791.2 (= HU Del) Using HUBBLE SPACE TELESCOPE Fine Guidance Sensor 3: Parallax and Component Masses*
FREE ISSUEG. Fritz Benedict1, Barbara E. McArthur1, Otto G. Franz2, Lawrence H. Wasserman2 and Todd J. Henry3
Show affiliationsWith fourteen epochs of fringe-tracking data spanning 1.7 yr from Fine Guidance Sensor 3 we have obtained a parallax (πabs = 113.1 ± 0.3 mas) and perturbation orbit for Gl 791.2A. Contemporaneous fringe-scanning observations yield only three clear detections of the secondary on both interferometer axes. They provide a mean component magnitude difference, ΔV = 3.27 ± 0.10. The period (P = 1.4731 yr), from the perturbation orbit, and the semimajor axis (a = 0.963 ± 0.007 AU), from the measured component separations with our parallax, provide a total system mass MA + MB = 0.412 ± 0.009 M
. Component masses are MA = 0.286 ± 0.006 M and MB = 0.126 ± 0.003 M. Gl 791.2A and Gl 791.2B are placed in a sparsely populated region of the lower main-sequence mass-luminosity relation where they help define the relation because the masses have been determined to high accuracy, with errors of only 2%.
- Footnote
- Keywords
astrometry; binaries: general; stars: distances; stars: individual (Gliese 791.2); stars: late-type; stars: low-mass, brown dwarfs
- Dates
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Issue 2 (2000 August)
Received 1999 October 5, accepted for publication 2000 March 26
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Interferometric Astrometry of the Low-Mass Binary Gl 791.2 (= HU Del) Using HUBBLE SPACE TELESCOPE Fine Guidance Sensor 3: Parallax and Component Masses
G. Fritz Benedict et al. 2000 The Astronomical Journal 120 1106
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