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Statistical analysis of microflares as observed by the 4–8 GHz spectropolarimeter
Altyntsev, Alexander; Meshalkina, Nataliya; Zhdanov, Dmitriy +1 more
Radio observations of weak events are one of the promising methods for studying energy release and non-thermal processes in the solar corona. The development of instrumental capabilities allows for radio observations of weak transient coronal events, such as quasi-stationary brightenings and weak flares of X-ray class B and below, which were previ…
The Cluster Virtual Observatory for ULF Waves
Richter, I.; Glassmeier, K. H.; Plaschke, F. +3 more
Since its launch in 2000, the Cluster fleet visited a vast domain of the circum-terrestrial environment, from the upstream solar wind and the distant tail, down to the plasmasphere, scanning in detail all magnetospheric regions during over two solar cycles. This led to an unprecedentedly rich data collection of multi-point measurements which will …
M51 ULX-4 ve NGC 1316 ULX X7'nin X-ışın ve Optik Özellikleri
Allak, Sinan; Soydugan, Faruk; Akyüz, Aysun
Bu çalışmada, gökada NGC 1316'da ULX X7 ve M51'de geçici ULX-4 kaynaklarının X-ışın tayfsal, zamansal ve optik özellikleri {\it Chandra}, {\it XMM-Newton}, {\it Swift-XRT} ve {\it HST} arşiv verileri kullanılarak kapsamlı bir şekilde araştırıldı. Bir X-ışın kaynağı olan X7'nin, ilk defa bu çalışmada 2019 {\it Chandra} gözlemleri kullanılarak bir U…
Comparison of Gaia BP/RP spectra with LDS (Low Dispersion Spectroscopy) photographic sky surveys
Hudec, R.
Blue (BP) and Red (RP) Photometer low-resolution spectral data is one of the exciting new products in the third data release of ESA satellite Gaia (Gaia DR3) https://gaia.aip.de/cms/services/spectra-access/. The Gaia "photometric mode" RP/BP generates ultra-low-dispersion prism spectra of celestial sources. The LDS (Low-Dispersion Spectroscopy) as…
Gaia-based comparative study of protoplanetary disk frequencies in young stellar clusters
Mendigutía, I.; Huélamo, N.; Solano, E. +4 more
This poster presents the results of a recent work (https://www.aanda.org/articles/aa/full_html/2022/08/aa43146-22/aa43146-22.html {Mendigutía et al. 2022, A&A, 664, A66}), where we have compared protoplanetary disk frequencies inferred from 2 widely different regions corresponding to 2 pc and 20 pc from the centers of a representative sample o…
Magnetohydrodynamic Shocks Revisited: Magnetically Constraining the Upstream Solar Wind Condition
Narita, Yasuhito; Schmid, Daniel
Magnetohydrodynamic (MHD) shocks are commonly found in various space and astrophysical systems. One often encounters the problem that only the magnetic field data are available when studying interplanetary shocks and planetary bow shocks in the solar system, and not the plasma data due to instrumental and/or telemetry limitations. We aim to reveal…
Feige 86: Gaia confirms its Horizontal Branch nature
Bonifacio, P.; Monaco, L.
The halo star Feige 86 was considered in the 1960's and 1970's a solar metallicity chemically peculiar, He-weak B type star. Margherita Hack was the first to study its UV spectrum acquired with the IUE satellite. Later studies of this star by Hack and collaborators suggested that, in spite of the fact its iron abundance is slightly above solar, th…
Derivation of Instrument Requirements for Polarimetry Using Mg, Fe, and Mn Lines between 250 and 290 nm
Judge, P. G.; Sainz Dalda, A.; de Wijn, A. G. +1 more
Judge et al. recently argued that a region of the solar spectrum in the near-UV between about 250 and 290 nm is optimal for studying magnetism in the solar chromosphere, due to an abundance of Mg II, Fe II, and Fe I lines that sample various heights in the solar atmosphere. In this paper, we derive requirements for spectropolarimetric instruments …
The power of XP Gaia spectrophotometry and Self-Organizing Maps to analyze the evolutionary state and physical properties of Milky Way stars
Garabato, D.; Dafonte, C.; Manteiga, M. +1 more
The Gaia space telescope is able to gather a vast amount of data from each of the sources it explores. Among them, are the Blue and Red Photometer (BP/RP) spectra, also known as XP spectra. Most of those sources (and their physical properties) are easy to identify, but for some others, it is necessary to perform a deeper study on them. More precis…
Spectral evolution and calcium white dwarfs in J-PLUS
Gänsicke, B. T.; Carrasco, J. M.; Tremblay, P. -E. +8 more
We complement the Gaia-based catalogue of white dwarfs with the optical photometry from the Javalambre Photometric Local Universe Survey (J-PLUS) DR2, covering $2 176$ deg$^2$ with 12 passbands ($ugriz$ + 7 medium bands). We define a common sample of $5 926$ white dwarfs with $r < 19.5$ mag and derive their effective temperature ($T_{eff})$, su…