Search Publications
Analysis of TESS Field Eclipsing Binary Star V948 Her: A Pulsating or Non-pulsating Star?
Kahraman Aliçavuş, F.; Ekinci, Ö.
Pulsating stars occupy a significant place in the H-R diagram and it was thought that all stars inside the classical instability strip should pulsate. However, recent studies showed that there are many non-pulsating stars located inside the classical instability strip. The existence of these non-pulsating stars is still a mystery. To deeply unders…
HT Lyn and IR Lyn: Two Semi-detached-type Near-contact Binaries with Stable Orbital Period
Meng, Zi-Bin; Wang, Hong-Wei; Yu, Yun-Xia +2 more
We presented the first photometric and orbital period investigations for two near-contact binaries: HT Lyn and IR Lyn. The light-curves solutions derived from both our ground-based and various surveys' observations suggested that HT Lyn and IR Lyn are two semi-detached-type near-contact binaries with the secondary and primary components filling th…
The Stellar Abundances and Galactic Evolution Survey: Photonic Passbands and Extinction Coefficients for the u and v Bands
Tan, Ke-Feng; Zhao, Gang; Fan, Zhou +6 more
The Stellar Abundances and Galactic Evolution Survey (SAGES) is a multi-band photometric survey focused on estimation of stellar atmospheric parameters and interstellar extinction. In this paper we have derived photonic passbands for the intermediate-band u and v filters of the SAGES photometric system. The derived photonic passbands have been com…
New Apsidal Motion in Four Eccentric Eclipsing Binaries: V610 Car, V944 Cep, V2815 Ori and V1260 Tau
Bulut, Ahmet
This paper presents an apsidal motion analysis. The apsidal motion analysis of the eccentric eclipsing binaries V610 Car (P = 4.84 days), V944 Cep (P = 6.56 days), V2815 Ori (P = 2.13 days), and V1260 Tau (P = 5.43 days) was performed using minima times from the O-C Gateway database, ASAS-3, ASAS-SN, and TESS, following Lacy's approach. The rates …
Search for the Metal-weak Thick Disk from the LAMOST DR5
Tian, Hao; Zhang, Bo; Shi, Jian-Rong +2 more
Based on the data release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope survey (LAMOST DR5) and the Gaia Early Data Release 3 (Gaia EDR3), we construct a sample containing 46,109 giant (log g ≤ 3.5 dex) stars with heliocentric distance d ≤ 4 kpc, and the sample is further divided into two groups of the inner (R GC <…
Analyzing Dominant 13.5 and 27 day Periods of Solar Terrestrial Interaction: A New Insight into Solar Cycle Activities
Saikia, Eeshankur; Syiemlieh, Rissnalin; Adhikary, Manashee +1 more
Our analysis presents an explanation of the Sun-Earth coupling mechanism during declining phase of a solar cycle, and how the dominant 13.5 and 27 day periods play roles in the coupling mechanism which led to intense terrestrial magnetic storms during this declining phase compared to the rising phase of a solar cycle. Moreover, it is observed that…
Diffuse Interstellar Bands λ6379, λ6614, and λ6660 in the LAMOST-MRS Spectra
Luo, A. -Li; Hou, Wen; Zhao, Yong-Heng +2 more
Diffuse interstellar bands (DIBs) have always been a mysterious existence in astronomical research. In this work, we provide more DIB samples to slightly uncover this mystery. With the LAMOST medium-resolution survey (MRS) spectra, we detected three DIBs λ6379, λ6614, and λ6660, obviously superimposed on the spectra of 11,003 stars. These spectra …
KIC 10417986: Spectroscopic Confirmation of the Nature of the Binary System with a δ Scuti Component
Esamdin, Ali; Fu, Jian-Ning; Yang, Tao-Zhi +9 more
KIC 10417986 is a short orbital period (0.0737 day) ellipsoidal variable star with a δ Sct and γ Dor hybrid pulsation component discovered by Kepler. The ground-based spectroscopic observations were carried out in the winters of 2020 and 2021 to investigate the binary nature of this star. We derive the orbital parameters using the rvfit code with …
A Stellar Ranging Scheme Based on the Second-order Correlation Measurement
Li, Jian; Xu, Can; Liu, Yinshen +5 more
Stellar ranging is the basis for stellar dynamics research and in-depth research on astrophysics. The parallax method is the most widely used and important basic method for stellar ranging. However, it needs to perform high-precision measurement of the parallax angle and the baseline length together. We aim to propose a new stellar ranging scheme …
Spectral Behavior and Flaring Activity of II Peg in the Ultraviolet
Sanad, M. R.
We have studied the spectral behavior of the II Peg binary system in the ultraviolet band by using International Ultraviolet Explorer (IUE) observations over the period 1979-1993. The ultraviolet observations reveal indication of flare activity in both chromosphere and transition region with their enhanced emission lines. Before and after the flar…