Search Publications
Temporal and spatial association between microwaves and type III bursts in the upper corona
Reid, H.; Altyntsev, A. T.; Meshalkina, N. S. +2 more
One of the most important tasks in solar physics is the study of particles and energy transfer from the lower corona to the outer layers of the solar atmosphere. The most sensitive methods for detecting fluxes of non-thermal electrons in the solar atmosphere is observing their radio emission using modern large radioheliographs. We analyzed joint o…
Environmental effects on associations of dwarf galaxies
Gottlöber, Stefan; Libeskind, Noam I.; Yepes, Gustavo +5 more
We study the properties of associations of dwarf galaxies and their dependence on the environment. Associations of dwarf galaxies are extended systems composed exclusively of dwarf galaxies, considering as dwarf galaxies those galaxies less massive than $M_{\star , \rm max} = 10^{9.0}$${\rm M}_{\odot }\, h^{-1}$. We identify these particular syste…
Temporal Evolution of Titan's Stratospheric Temperatures and Trace Gases from a Two-dimensional Retrieval of Cassini Composite Infrared Spectrometer Data
Achterberg, Richard K.
We use a two-dimensional (2D) radiative transfer model of Titan, which allows the atmospheric structure to vary in both altitude and latitude, to retrieve the spatial distribution of temperature, haze extinction, and C2H2, C2H6, C3H8, CH3C2H, C4H
The peculiar ejecta of the nova V1425 Aquilae
Schmidtobreick, L.; Celedón, L.; Tappert, C.
Many important details of the mechanisms underlying the ejection of material during a (classical) nova eruption are still not understood. Here we present optical spectroscopy and narrow-band images of the nova V1425 Aql, 23 yr after the nova eruption. We find that the ejecta consist of two significantly different components. The first resembles wh…
Did Kepler-444 have a long-lived convective core?
Stokholm, Amalie; Verma, Kuldeep; Aguirre Børsen-Koch, Víctor +2 more
With the greater power to infer the state of stellar interiors provided by asteroseismology, it has become possible to study the survival of initially convective cores within stars during their main-sequence evolution. Standard theories of stellar evolution predict that convective cores in subsolar mass stars have lifetimes below $1\, {\rm Gyr}$. …
Type II and anomalous Cepheids in the Kepler K2 mission
Bódi, Attila; Szabó, Róbert; Molnár, László +4 more
We present the results of the analysis of Type II and anomalous Cepheids using the data from the Kepler K2 mission. The precise light curves of these pulsating variable stars are the key to study the details of their pulsation, such as the period-doubling effect or the presence of additional modes. We applied the Automated Extended Aperture Photom…
An Update of the Catalog of Radial Velocity Standard Stars from the APOGEE DR17
Huang, Yang; Luo, A. -Li; Dong, Xiao-Bo +2 more
We present an updated catalog of 46,753 radial velocity (RV) standard stars selected from the APOGEE DR17. These stars cover the Northern and Southern Hemispheres almost evenly, with 62% being red giants and 38% being main sequence stars. These RV standard stars are stable on a baseline longer than 200 days (with 54% longer than one year and 10% l…
Effects of the Ionospheric Conductance on the Dynamics of the Magnetotail
El-Alaoui, Mostafa; Walker, Raymond J.; McPherron, Robert L.
We have carried out a series of numerical experiments designed to evaluate the sensitivity of global magnetohydrodynamic simulations to changes in ionospheric conductance. We multiplied the precipitating energy fluxes due to both strong pitch angle scattering and parallel currents by constant factors in the Robinson et al. (1987,
On the true nature of the contact binary CRTS J192848.7‑404555
Filipović, Miroslav; Wadhwa, Surjit S.; DeHorta, Ain Y. +1 more
CRTS J192848.7‑404555 was recognized as a potential contact binary merger candidate on the basis of survey photometry analysis. We have carried out follow‑up ground‑based photometry of the system and showed that at the recorded coordinates for the system, there are two stars approximately 3 s of arc apart. Our analysis shows that the fainter of th…
Determination of the eddy diffusion in the Venusian clouds from VeRa sulfuric acid observations
Sheng, Zheng; Dai, Longkang; Shao, Wencheng +1 more
Context. The vertical eddy diffusion coefficient (Kzz) characterizing the efficiency of vertical atmospheric mixing is essential for 1D planetary atmospheric modeling, but poorly constrained in the Venusian clouds, where our ability to observe tracer gases is limited. The Venusian clouds are mainly composed of H2SO4