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Local galaxies with compact cores as the possible descendants of massive compact quiescent galaxies at high redshift
Fan, Lu-Lu; Gao, Ying
In order to test a possible evolutionary scenario of high-z compact quiescent galaxies (cQGs) that they can survive as local compact cores embedded in local massive galaxies with different morphology classes, we explore the star formation histories of local compact cores according to their spectral analysis. We build a sample of 182 massive galaxi…
Accuracy of view factor calculations for digital terrain models of comets and asteroids
Rezac, L.; Zhao, Y.
Context. Detailed shape and topographic models coupled with sophisticated thermal physics are critical elements to proper characterization of surfaces of small bodies in our solar system. Calculations of self-heating effects are especially important in the context of thermal evolution of non-convex surfaces, including craters, cracks, or openings …
On the Long Range Clustering of Global Seismicity and its Correlation With Solar Activity: A New Perspective for Earthquake Forecasting
Marchitelli, Vito; Troise, Claudia; Harabaglia, Paolo +2 more
Large earthquakes occurring worldwide have long been recognized to be non Poisson distributed, so involving some large scale correlation mechanism, which could be internal or external to the Earth. We have recently demonstrated this observation can be explained by the correlation of global seismicity with solar activity. We inferred such a clear c…
Statistical Analysis of Asymmetric Sunspot Decay Observed by Hinode
Imada, Shinsuke; Kato, Shota; Fujiyama, Masashi
We statistically studied the transport of magnetic flux in and around sunspots using a magnetic-element tracking technique to investigate whether sunspot-decay processes are isotropic. Using this method, we detected moving magnetic features (MMFs). The observed radius of an MMFs region was approximately 1.7 times the sunspot radius; furthermore, t…
On the flux saturation of SOHO/ERNE proton events
Miteva, Rositsa; Dechev, Momchil; Samwel, Susan W. +1 more
This study lists the main procedures completed on the analysis of solar proton events using data from the SOHO/ERNE high energy detector in the period 1996$-$2017. The highest possible temporal resolution of 1 minute is used here. The proton fluxes from the two analyzed energy channels, at $\sim$25 and $\sim$50 MeV, are compared with the respectiv…
Bright spectroscopic binaries: I. Orbital parameters of five systems with periods of P < 365 days
Jack, Dennis; Schröder, Klaus-Peter; Hernández Huerta, Missael Alejandro
In a well‑aimed search based on the recently published Gaia DR2 radial velocity data and performed with the robotic TIGRE telescope, we have discovered 19 bright (mV < 7.66 mag) spectroscopic binary stars. We present the radial velocity curves of five of these stars (HD 20656, HD 27259, HD 98812, HD 150600, HD 193082) with periods of P < 365…
Identification of young nearby runaway stars based on Gaia data and the lithium test†
Torres, Guillermo; Mugrauer, Markus; Lux, Oliver +6 more
Young nearby runaway stars are suitable to search for their place of origin and possibly associated objects, for example, neutron stars. Tetzlaff et al. (2011) selected young (≤50 Myr) runaway star candidates from Hipparcos, for which they had estimated the ages from the location in the Hertzsprung-Russell diagram and evolutionary models. Here, we…
X-Ray Observations of the Peculiar Cepheid V473 Lyr Identify A Low-mass Companion
Drake, Jeremy J.; Evans, Nancy Remage; Marengo, Massimo +17 more
V473 Lyr is a classical Cepheid that is unique in having substantial amplitude variations with a period of approximately 3.3 yr, thought to be similar to the Blazhko variations in RR Lyrae stars. We obtained an XMM-Newton observation of this star to follow up a previous detection in X-rays. Rather than the X-ray burst and rapid decline near maximu…
Dust and gas in the central region of NGC 1316 (Fornax A). Its origin and nature
Hilker, M.; Richtler, T.; Iodice, E.
Context. The early-type galaxy NGC 1316, associated with the radio source Fornax A, hosts about 107 M⊙ of dust within a central radius of 5 kpc. These prominent dust structures are believed to have an external origin, which is also a popular interpretation for other dusty early-type galaxies. Moreover, it has been long known …
First speckle interferometric measurements of binary stars at the Observatorio Astrofísico Guillermo Haro
Guerrero, C. A.; Castillo, E.; Rosales-Ortega, F. F. +4 more
In this paper, we present the first multiband speckle interferometric measurements of binary stars performed using the 2.1 m telescope of the Observatorio Astrofísico Guillermo Haro, Cananea, Sonora, México. We describe here FICCO: Fast Imaging Camera for Cananea Observatory, a new instrument developed to perform speckle observations from the Nort…