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标题：Observations of Binary Stars with the Differential Speckle Survey Instrument. IX. Observations of Known and Suspected Binaries, and a Partial Survey of Be Stars
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作者：Elliott P.Horch ; Gerard T.van Belle ; James W.Davidson Jr. 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：5
页码：3167-3181
DOI：10.3847/1538-3881/ab87a6
语种：English
出版社：American Institute of Physics
摘要：We report 370 measures of 170 components of binary and multiple-star systems, obtained from speckle imaging observations made with the Differential Speckle Survey Instrument at Lowell Observatory's Discovery Channel Telescope in 2015 through 2017.Of the systems studied, 147 are binary stars, 10 are seen as triple systems, and 1 quadruple system is measured.Seventy-six high-quality nondetections and 15 newly resolved components are presented in our observations.The uncertainty in relative astrometry appears to be similar to our previous work at Lowell, namely, linear measurement uncertainties of approximately 2 mas, and the relative photometry appears to be uncertain at the 0.1–0.15 mag level.Using these measures and those in the literature, we calculate six new visual orbits, including one for the Be star 66 Oph and two combined spectroscopic–visual orbits.The latter two orbits, which are for HD 22451 (YSC 127) and HD 185501 (YSC 135), yield individual masses of the components at the level of 2% or better, and independent distance measures that in one case agrees with the value found in the Gaia DR2 and in the other disagrees at the 2σ level.We find that HD 22451 consists of an F6V+F7V pair with orbital period of 2401.1 ± 3.2 days and masses of 1.342 ± 0.029 and $1.236\pm 0.026\,{M}_{\odot }$.For HD 185501, both stars are G5 dwarfs that orbit one another with a period of 433.94 ± 0.15 days, and the masses are 0.898 ± 0.012 and $0.876\pm 0.012\,{M}_{\odot }$.We discuss the details of both the new discoveries and the orbit objects.
关键词：Interferometric binary stars;Spectroscopic binary stars;Visual binary stars;Astronomical techniques;Be stars