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The Improved Orbit Solution and Component Masses of bet LMi
Wang, Xiaoli; Fu, Yanning; Xia, Fang
bet LMi is a double-lined visual binary with an orbital period of ∼39 yr. Via a simultaneous fitting to both astrometric and radial velocity measurements, we give a complete and improved orbit solution with high precision. Then, the component masses are precisely determined as 2.98 ± 0.10 M⊙ and 1.92 ± 0.04 M⊙ with a relative…
A New Moving Group in the Local Arm
Zhao, Gang; Chen, Yuqin; Zhao, Jingkun +5 more
We present a new moving group clustered in kinematics, spatial position, and elemental abundances. Its spatial position is around the center of the Local Arm of the Milky Way. A convergent point method was taken to select candidate member stars. Among 206 candidate member stars, 74 are pre-main-sequence stars and some of them have stellar disks. W…
Serendipitous Discovery of a Physical Binary Quasar at z = 1.76
Geier, S.; Fynbo, J. P. U.; Heintz, K. E. +7 more
Binary quasars are extremely rare objects, used to investigate clustering on very small scales at different redshifts. The cases where the two quasar components are gravitationally bound, known as physical binary quasars, can also exhibit enhanced astrophysical activity and therefore are of particular scientific interest. Here we present the seren…
KR Persei, a Mid-F Eclipsing Binary with a One-day Period
Fekel, Francis C.; Muterspaugh, Matthew W.; Sowell, James R. +5 more
KR Per is a partially eclipsing binary with an orbital period of 0.9960798 days, very close to one sidereal day, making it difficult to obtain extensive phase coverage in a reasonable amount of time. We used the Wilson-Devinney program to determine its orbital elements and stellar absolute dimensions from recently acquired radial velocities and di…
Analytic Marginalization of Absorption Line Continua
Tchernyshyov, Kirill
Absorption line spectroscopy is a powerful way of measuring properties of stars and the interstellar medium. Absorption spectra are often analyzed manually, an approach that limits reproducibility and which cannot practically be applied to modern data sets consisting of thousands or even millions of spectra. Simultaneous probabilistic modeling of …