Polaris is the nearest and brightest classical Cepheid, and pulsates with a period of about 4
d. It has long been known as a single-lined spectroscopic binary with an orbital period of 30 …

We have performed a detailed systematic search for multiperiodicity in the Population I
Cepheids of the Large Magellanic Cloud. In this process, we have identified for the first time …

Aims. The purpose of the present study is to research the origin of planetary companions by
using a precise radial velocity (RV) survey. Methods. The high-resolution spectroscopy of …

We investigate temporally changing variability amplitudes and the multi-periodicity of the
type-I Cepheid Polaris using 161 high-precision radial velocity (RV) and bisector inverse …

ABSTRACT A previously derived photometric parallax of 10.10±0.20 mas, d= 99±2 pc, is
confirmed for Polaris by a spectroscopic parallax derived using line ratios in high dispersion …

Hydrodynamic models of short-period Cepheids were computed to determine the pulsation
period as a function of evolutionary time during the first and third crossings of the instability …

Aims. The aim of our paper is to investigate the low-amplitude and long-period variations in
evolved stars with a precise radial velocity survey. Methods. The high-resolution, the fiber …

We present an analysis of 67 recent spectra of α UMi (Polaris) obtained in 2017 August–
2018 May. Frequency analysis reveals an increase in the pulsation period to relative to our …

We present the detection of long-period RV variations in HD 36384, HD 52030, and HD
208742 by using the high-resolution, fiber-fed Bohyunsan Observatory Echelle …

Aims. We have been carrying out a precise radial velocity (RV) survey for K giants to search
for and study the origin of the low-amplitude and long-periodic RV variations. Methods. We …