Publications of the MPIfR Optical & Infrared Interferometry Group


Balega, I. I.; Balega, Yu. Yu.; Falcke, H.; Osterbart, R.; Reinheimer, T.; Schöller, M.; Weigelt, G.

Speckle interferometry of the spectroscopic binaries Gliese 150.2 and 41 Draconis

Astronomy Letters, v.23, No.2, p.172-176 (1997)

Abstract
We present the first diffraction-limited, visible and infrared speckle masking observations of the nearby spectroscopic binaries Gl 150.2 and 41 Dra performed with the 6-m telescope. Gl 150.2 is a pair of K0 and M0 dwarfs with a magnitude difference of 2[roman m over dot]49 ± 0[roman m over dot]05 in the red. Its orbital period is close to ten years. A preliminary apparent orbit was derived for the pair 41 Dra with double-lined F7 V components from six speckle measurements. The masses of the components of 41 Dra determined with an error of ±16 are 1.26µ[sun] and 1.18µ[sun]. Their absolute magnitudes, M<sub>bol</sub><sup>a</sup> = 2.92 and M<sub>bol</sub><sup>b</sup> = 3.30, place them 0[roman m over dot]8 above the main-sequence stars of the same spectra range.

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