Bright Spectroscopic Binaries: <scp>IV</scp> . Additional Binary Systems With P&lt;1000 Days

ABSTRACT In this fourth publication of our series, we present the analysis of a further nine bright spectroscopic binaries (HD 9728, HD 21835, HD 32575, HD 41118, HD 59539, HD 88748, HD 148434, HD 177698, HD 189985) discovered with the TIGRE telescope. We obtained intermediate resolution spectra, which we used to determine the radial velocity variations and then the orbital parameters of the binary systems. The results were compared with Gaia DR3 orbits that are available for some of the binary stars. They are in good agreement, but with our analysis we could improve the orbital solutions and parameters. We further used the spectra to determine the stellar parameters of the primary stars. A comparison with evolution tracks allowed us to obtain an estimate of their masses and ages. All primaries turn out to be evolved, bright K giants, ascending on the RGB, Helium burning, or at the foot of the AGB. We were also able to estimate the minimum masses of the secondary stars. For some cases, we could determine the actual mass of the secondary using the inclinations from the Gaia DR3 non‐single stars catalogue. We found that the secondary stars of these systems are all low‐mass stars.