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On the Age of Galactic Bulge CSPNe: Too Young and Complicated?
Parker, Quentin A.; Lykou, Foteini; Zijlstra, Albert
We present preliminary results of our study of a small sample of planetary nebulae in the Galactic Bulge for which high-angular resolution Hubble Space Telescope imaging is available. From this and from archival spectroscopy, we were able to calculate temperatures and luminosities for their central stars. These were then correlated to up-to-date e…
Particle Induced X-ray Emission at Mercury and the Moon.
Grande, Manuel; Cooper, Rose
Mercury and the Moon are examples of terrestrial bodies which lack an atmosphere and therefore have surfaces which interact directly with the space environment. Thus the surfaces can be reprocessed by plasma impact, and in the process can emit X-rays via the Particle Induced X-ray Emission (PIXE) process. We will present and review existing measur…
HD 54361: evidence for the status of a low mass TP-AGB star
Schmidt, M.; Sperauskas, J.; Začs, L. +3 more
The mass of the cool carbon star HD 54361 was suspected to be high, assuming the membership in the stellar association CMa OB1, in conflict with the theory of stellar evolution. The Gaia parallax and a high-resolution spectrum in the wavelength region from about 4800 to 6900 Å was employed in order to update the distance, atmospheric parameters an…
New Virtual Moon Atlas freeware version 7
Legrand, Christian; Chevalley, Patrick
Introduction: Since 2002, we develop a freeware to help Moon observing, to improve interest for Moon in general public, and to provide a basic tool for aggregating informations on the Moon for professionals.Double windows with "Kaguya / LRO Shaded relief" and "Unified geologic 2020" textures Presentation : VMA uses datas coming from NASA, USGS, JP…
EREBUS: the EuRopean Extinction BUmp Survey
Shipman, R. F.; Kargl, G.; Skalidis, R. +14 more
Dust in the Interstellar Medium (ISM) is intimately linked to the life cycle of stars. Despite being of such fundamental importance to galaxy evolution, the dynamic behaviour and composition of the ISM are not yet fully understood. Observations of reddened Milky Way OB stars have revealed a strong UV extinction feature around 2175 Å and a precipit…
Observation of Gaia (DR2) Red and White Dwarf Binary Stars in the Solar Neighborhood (Abstract)
Wasson, R.
(Abstract only) The Gaia satellite combines astrometric, parallax, photometric, and spectroscopic measurements of stellar propertiesówith greater accuracy than ever before. In 2018 Gaia Data Release 2 (DR2) made preliminary but consistent data available for an extraordinary number of stars: 1.3 Billion!
Fractal dimension in star formation regions
Canavesi, T.; Hurtado, S.
Several two-dimensional studies in spiral galaxies show that HII star formation regions have a fractal distribution, with a fractal dimension of approximately 2.3. In this work, the fractal dimension is calculated through the box-counting method implemented in an R code. The innovation of the work lies in calculating the fractal dimension directly…
Follow‑up imaging observations of comet 2I/Borisov
Mugrauer, Markus; Schlagenhauf, Saskia; Bischoff, Richard +3 more
Follow‑up imaging observations of the first detected interstellar comet 2I/Borisov are presented, which were carried out with the Schmidt‑Teleskop‑Kamera at the University Observatory Jena in 11 observing epochs in October and November 2019. The orbital solution of the comet, derived from the obtained astrometric measurements, confirms its highly …
Changes of plasma parameters in Earth magnetosphere tail during substorm initialization
Grigorenko, E. E.; Kronberg, E. A.; Kozak, L. V. +3 more
The MICROSCOPE space mission to test the Equivalence Principle
Métris, Gilles; Rodrigues, Manuel; Touboul, Pierre +2 more