Search Publications
Missions
Journals
Publication Years
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…
Millimetre Observations of Maser-Emitting Planetary Nebulae
Boumis, Panayotis; Ramos-Larios, Gerardo; Miranda, Luis F. +7 more
Observations in the millimetre bands of maser-emitting planetary nebulae (PNe) are crucial to study their circumstellar molecular gas at the beginning of the PN phase. Maser-emitting PNe are in the earliest phases of PN formation; therefore, these sources are key objects to study the molecular content during the early evolution of PNe. These circu…
Tidal Constraints for Wide Binaries in Pleiades
Danilov, V. M.
—A technique is proposed for estimating the parameters of spatial orientation of the
Solar and geomagnetic activity dependence of 150-km echoes observed by the Equatorial Atmosphere Radar in Indonesia
Yokoyama, Tatsuhiro; Takagi, Rieko; Yamamoto, Mamoru
The occurrence characteristics of 150-km echoes in low-latitude regions are studied using the Equatorial Atmosphere Radar (EAR) in Indonesia. The long-term observation of the 150-km echoes by the EAR enables us to study the occurrence characteristics of 150-km echoes statistically. It is shown that the occurrence rate of the 150-km echoes observed…
V608 Cassiopeiae: A W UMa-Type Eclipsing Binary with Two Possible Circumbinary Companions
Lee, Jae Woo; Park, Jang-Ho
We present the photometric properties of V608 Cas from detailed studies of light curves and eclipse timings. The light curve synthesis indicates that the eclipsing pair is an overcontact binary with parameters of ΔT = 155 K, q = 0.328, and f = 26%. We detected the third light ℓ_{3}, which corresponds to about 8% and 5% of the total systemic light …
Evidence of distant spiral arms in the Galactic disk quadrant IV from VVV red clump giants
Minniti, D.; Saito, R. K.; Alonso-García, J. +4 more
The discovery of new clear windows in the Galactic plane using the VVV near-IR extinction maps allows the study of the structure of the Milky Way (MW) disk. The ultimate goal of this work is to map the spiral arms in the far side of the MW, which is a relatively unexplored region of our Galaxy, using red clump (RC) giants as distance indicators. W…
Stark broadening effect in hot DA white dwarfs: Ultraviolet lines of Fe V
Hamdi, Rafik; Ben Nessib, Nabil; Sahal-Bréchot, Sylvie +1 more
Stark widths and shifts have been calculated for 17 ultraviolet lines of Fe V of astrophysical interest. The calculations have been made using semiclassical perturbation approach. The work is motivated by the importance of ultraviolet lines for the study of hot white dwarf atmospheres specially for investigations of the variation of fine structure…
Interface Region Imaging Spectrograph (IRIS) Observations of the Fractal Dimension in the Solar Atmosphere
Aschwanden, Markus J.; Vilangot Nhalil, Nived
While previous work explored the fractality and self-organized criticality (SOC) of flares and nanoflares in wavelengths emitted in the solar corona (such as in hard X-rays, soft X-rays, and EUV wavelenghts), we focus here on impulsive phenomena in the photosphere and transition region, as observed with the {\sl Interface Region Imaging Spectrogra…
Patterns of martian glacial deformation: Implications for glacio-geology, internal structure, and regional climate
Conway, Susan J.; Becerra, Patricio; Grau Galofre, Anna +2 more
Viscous Flow Features (VFF) are widespread in the martian mid-latitudes and indicative of near-surface ice deposits. Their distribution and morphology hint at the regional history of ice deposition and ablation, as well as changes in surface temperature. Here we interrogate the deformation history of a type of VFF, a Lobate Debris Apron (LDA), loc…
The impact hazard of near-Sun comets
Neslušan, Luboš; Tomko, Dušan
There are several groups of comets with perihelion near the solar surface known. Of these, the Marsden and Kracht groups move in orbits situated in a spatial corridor of the daytime Arietid meteoroid stream. The orbits of comets of the Meyer group are not very different from those of the Marsden and Kracht groups; for the purpose of our study, we …