Bright Spectroscopic Binaries: I. Orbital parameters of five systems with periods of P < 365 days

Abstract

In a well-aimed search based on the recently published Gaia~DR2 radial velocity data and performed with the robotic TIGRE telescope, we have discovered 19 bright ($m_V<7.66$~mag) spectroscopic binary stars. We present the radial velocity curves of five of these stars (HD~20656, HD~27259, HD~98812, HD~150600, HD~193082) with periods of $P<365$~days. We determined their orbital parameters using the toolkit RadVel. The complete set of basic stellar parameters (effective temperature, surface gravity, metallicity, mass and age) of the primary stars are determined using the observed intermediate resolution spectra ($R\approx 20,000$) with iSpec and a comparison of the position in the HRD with stellar evolution tracks. All five primary stars have already evolved to the giant phase and possess low-mass secondaries, which do not noticeably affect the spectra. Finally, we determined the minimum masses of the secondary stars of the binary systems and present conclusions about the properties of the binary systems.

arXiv commentAccepted for publication in Astronomical Notes, 13 pages, 6 figures

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Cited by in corpus (2)

• Bright Spectroscopic Binaries: II. A study of five systems with orbital periods of P < 500 days
• Yet another star in the Albireo system -- The discovery of Albireo Ad