Observations of Binary Stars with the Differential Speckle Survey Instrument. IX. Observations of Known and Suspected Binaries, and a Partial Survey of Be Stars. (arXiv:2004.03065v1 [astro-ph.SR])

Observations of Binary Stars with the Differential Speckle Survey Instrument. IX. Observations of Known and Suspected Binaries, and a Partial Survey of Be Stars. (arXiv:2004.03065v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Horch_E/0/1/0/all/0/1">Elliott P. Horch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Belle_G/0/1/0/all/0/1">Gerard T. van Belle</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Davidson_J/0/1/0/all/0/1">James W. Davidson, Jr.</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Willmarth_D/0/1/0/all/0/1">Daryl Willmarth</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fekel_F/0/1/0/all/0/1">Francis C. Fekel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Muterspaugh_M/0/1/0/all/0/1">Matthew Muterspaugh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Casetti_Dinescu_D/0/1/0/all/0/1">Dana I. Casetti-Dinescu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hahne_F/0/1/0/all/0/1">Frederick W. Hahne</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Granucci_N/0/1/0/all/0/1">Nicole M. Granucci</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Clark_C/0/1/0/all/0/1">Catherine Clark</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Winters_J/0/1/0/all/0/1">Jennifer G. Winters</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rupert_J/0/1/0/all/0/1">Justin D. Rupert</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Weiss_S/0/1/0/all/0/1">Samuel A. Weiss</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Colton_N/0/1/0/all/0/1">Nicole M. Colton</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nusdeo_D/0/1/0/all/0/1">Daniel A. Nusdeo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Henry_T/0/1/0/all/0/1">Todd J. Henry</a>

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
non-detections and fifteen 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 to 0.15 magnitude 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 percent 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 2-$sigma$ level. We find that HD 22451 consists of
an F6V+F7V pair with orbital period of $2401.1 pm 3.2$ days and masses of
$1.342 pm 0.029$ and $1.236 pm 0.026$ $ M_{odot}$. For HD 185501, both stars
are G5 dwarfs that orbit one another with a period of $433.94 pm 0.15$ days,
and the masses are $0.898 pm 0.012$ and $0.876 pm 0.012$ $ M_{odot}$. We
discuss the details of both the new discoveries and the orbit objects.

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