Search Publications
Unveiling the origin of XMM-Newton soft proton flares: II. Systematics in the proton spectral analysis
Cappi, M.; Molendi, S.; Gastaldello, F. +7 more
Context. Low-energy (< 300 keV) protons entering the field of view of the XMM-Newton telescope scatter with the X-ray mirror surface and might reach the X-ray detectors on the focal plane. They manifest in the form of a sudden increase in the rates, usually referred to as soft proton flares. By knowing the conversion factor between the soft pro…
Effects of surface and subsurface water/ice on spatial distributions of impact crater ejecta on Mars
Wünnemann, Kai; Thomas, Nicolas; Sokołowska, Aleksandra
Ejecta blankets around craters on a km-scale show stark differences in the ejecta mobility (maximal extent of ejecta divided by the crater radius) with latitude and types of plains on Mars, which has been known for a long time (Barlow and Pollak, 2002; Li et al., 2015) but is not well-understood. Our main goal is to explore the idea that the subsu…
Stellar Pulsation and Evolution: A Combined Theoretical Renewal and Updated Models (SPECTRUM). I. Updating Radiative Opacities for Pulsation Models of Classical Cepheid and RR-Lyrae
Marconi, Marcella; Molinaro, Roberto; De Somma, Giulia +1 more
Pulsating stars are universally recognized as precise distance indicators and tracers of stellar populations. Their variability, combined with well-defined relationships between pulsation properties and intrinsic evolutionary parameters such as luminosity, mass, and age, makes them essential for understanding galactic evolution and retrieving star…
Deepest Limits on Scattered Light Emission from the Epsilon Eridani Inner Debris Disk with HST/STIS
Stark, Christopher C.; Debes, John H.; Hom, Justin +9 more
Epsilon Eridani is one of the first debris disk systems detected by the Infrared Astronomical Satellite. However, the system has thus far eluded detection in scattered light with no components having been directly imaged. Its similarity to a relatively young solar system combined with its proximity makes it an excellent candidate to further our un…
Testing He II Emission from Wolf–Rayet Stars as a Dust Attenuation Measure in Eight Nearby Star-forming Galaxies
Leitherer, Claus; Lee, Janice C.; Maschmann, Daniel +2 more
The ability to determine galaxy properties such as masses, ages, and star formation rates robustly is critically limited by the ability to measure dust attenuation accurately. Dust reddening is often characterized by comparing observations to models of either nebular recombination lines or the UV continuum. Here, we use a new technique to measure …
Archives of Photographic PLates for Astronomical USE (APPLAUSE). Digitisation of astronomical plates and their integration into the International Virtual Observatory
Enke, Harry; Heber, Ulrich; Tuvikene, Taavi +2 more
Aims: The Archives of Photographic PLates for Astronomical USE (APPLAUSE) project is aimed at digitising astronomical photographic plates from three major German plate collections, making them accessible through integration into the International Virtual Observatory (IVO).
Methods: Photographic plates and related materials (logbooks, env…
Berkeley 76: An intermediate age open star cluster in Gaia Era
Bisht, D.; Rangwal, Geeta; Raj, A. +3 more
We studied the open star cluster Berkeley 76 using Gaia DR3 and 2MASS data sets. We obtained 314 most probable cluster members with a membership probability greater than 80%. We have found the cluster center as α = 106.67 ± 0.07 deg and δ=‑11.75±0.07 deg. The mean PMs of cluster members in right ascension and declination are ‑0.60±0.22 and 1.35 ± …
Mapping the Longitudinal Magnetic Field in the Atmosphere of an Active Region Plage from the Inversion of the Near-ultraviolet CLASP2.1 Spectropolarimetric Data
Song, Donguk; Rachmeler, Laurel A.; Kobayashi, Ken +10 more
We apply the HanleRT Tenerife Inversion Code to the spectropolarimetric observations obtained by the Chromospheric Layer Spectropolarimeter. This suborbital space experiment measured the variation with wavelength of the four Stokes parameters in the near-ultraviolet spectral region of the Mg II h and k lines over a solar disk area containing part …
Revised Magnetospheric Model Reveals Signatures of Field-Aligned Current Systems at Mercury
Plaschke, Ferdinand; Exner, W.; Heyner, D. +2 more
Mercury is the smallest and innermost planet of our solar system and has a dipole-dominated internal magnetic field that is relatively weak, very axisymmetric and significantly offset toward north. Through the interaction with the solar wind, a magnetosphere is created. Compared to the magnetosphere of Earth, Mercury's magnetosphere is smaller and…
Electron Density Distribution in H II Regions in IC 10
Lebouteiller, Vianney; Ramambason, Lise; Jackson, James M. +7 more
We present the [O III] λ52 µm map of the dwarf galaxy IC 10 obtained with the Field-Imaging Far-Infrared Line Spectrometer on board the Stratospheric Observatory for Infrared Astronomy. We combine the [O III] λ52 µm map with Herschel and Spitzer observations to estimate the electron density distribution of the brightest H II regions of…