20 citations · 21 across the 15 of their papers we have counts for
16 papers · 1 filter
Tidally perturbed pulsations in OO Dra
Niveditha Parthasarathy, Mikhail Kovalev, Randa Asa'd
We perform a pulsation analysis of OO Dra using Light Curve data from TESS and present the first identification of six dipole modes as doublets from the primary star in OO Dra. The…
CW Cas: A solar-type contact binary system with an unseen third companion in a hierarchical quadruple system
Azizbek Matekov, Liying Zhu, Linjia Li +11
We present a comprehensive multiband photometric and spectroscopic study of the G-type binary CW Cas whose parameters have not been well determined. Our double-lined spectroscopic…
First double red giant Algol system with active mass transfer
Mikhail Kovalev, Hailiang Chen, Sufen Guo +7
Double red giant stars are very important for studies of the stability of mass transfer, common-envelope evolution, and the formation of double white dwarfs with short orbital peri…
Search for double-line spectroscopic binaries in RAVE survey
Mikhail Kovalev
I present a study for double-line spectroscopic binaries content in RAVE DR6 spectra, using composite spectral model. Three complementing selections found 2813 composite spectra, b…
Shortest period for outer orbit in compact hierarchical triple? Discovery of SB1 around V0885 Per
Mikhail Kovalev
I present a discovery of SB1 in the LAMOST-MRS spectra of eclipsing contact binary V 885 Per. Spectroscopic orbit has period only day, which will make it shortest known ou…
Spectroscopic orbits for three SB2s and one hierarchical triple using SALT data
Mikhail Kovalev, Alexey Kniazev, Oleg Malkov
We confirmed four spectroscopic binary candidates using new observations obtained with SALT. Three SB2 systems (HD 20784, HD 43519A, HD 62153A) exhibit circular orbits with periods…
Identification of false positive double-lined spectroscopic binaries in LAMOST-MRS data due to moonlight contamination
Zhoulin Wang, Mikhail Kovalev, Jianping Xiong +2
We present a method for identifying false positive double-lined spectroscopic binary (SB2) candidates by analysing medium-resolution survey spectra from the Large Sky Area Multi-Ob…
A New Algol-type Binary with an Accretion disk
Tongyu He, Jiao Li, Xiaobin Zhang +10
We present a comprehensive photometric and spectroscopic analysis of the Algol-type binary \textit{Gaia} DR3 1892576067672499328. We identified the system as a spectroscopic binary…
The new compact triple system: discovery of bright third star around contact binary using LAMOST-MRS spectra and photometry
Mikhail Kovalev, Azizbek Matekov, Sufen Guo +2
We present a study of the third star orbiting around known contact eclipsing binary J04+25 using spectra from the LAMOST medium-resolution survey (MRS) and publicly available photo…
Orbital Parameters of 665 Double-lined Spectroscopic Binaries in the LAMOST Medium-Resolution Survey
Sufen Guo, Mikhail Kovalev, Jiao Li +9
The period, mass ratio, eccentricity, and other orbital parameters are fundamental for investigating binary star evolution. However, the number of binaries with known orbital param…
Identifying Hierarchically Triple Star Systems with Gaia DR3 and LAMOST
Tongyu He, Jiao Li, Jiangdan Li +8
Triple star systems are critical for understanding stellar dynamics and compact objects in astrophysics, yet confirmed hierarchical triples identified via spectroscopy remain limit…
TV Mon -- post mass transfer Algol type binary with Scuti pulsations in primary component
Mikhail Kovalev, Zhenwei Li, Jianping Xiong +4
We present a study of the detached eclipsing binary TV~Mon using spectra from the LAMOST medium-resolution survey and ASAS-SN, CoRoT photometry. We apply multiple-epochs spectral f…
Search for spectroscopic binaries using rotational velocities in five open clusters observed by ESO
Mikhail Kovalev, Mariyam Ahmed, Randa Asa'd
In this paper we detect double-lined spectroscopic binaries (SB2) in five open clusters: NGC 2243, NGC 2420, NGC 3532, NGC 6253 and NGC 6705 (M 11) using a method based on high val…
Detection of 12426 SB2 candidates in the LAMOST-MRS, using a binary spectral model
Mikhail Kovalev, Zenghua Zhou, Xuefei Chen +1
We use an updated method for the detection of double-lined spectroscopic binaries (SB2) using values from spectral fits. The method is applied to all spectra from LAMOS…
Spectroscopic triples and a chance alignment. A solution for a problem of suspicious mass ratios for SB2s from Wilson method
Mikhail Kovalev, Xuefei Chen, Zhanwen Han
We selected three double-lined spectroscopic binary systems which have extreme mass ratios, if measured using the Wilson method. We analysed medium resolution spectroscopic observa…
r-process Abundance Patterns in the Globular Cluster M92
Evan N. Kirby, Alexander P. Ji, Mikhail Kovalev
Whereas light element abundance variations are a hallmark of globular clusters, there is little evidence for variation in neutron-capture elements. A significant exception is M15,…