Search Publications
Straight outta photosphere: Open solar flux without coronal modeling
Tähtinen, Ismo; Asikainen, Timo; Mursula, Kalevi
Context. The open solar flux, that is, the total magnetic flux escaping the Sun, is one of the most important parameters connecting solar activity to the Earth. The open solar flux is commonly estimated from photospheric magnetic field measurements by making model assumptions about the solar corona. However, the question in which way the open sola…
Once in a blue stream. Detection of recent star formation in the NGC 7241 stellar stream with MEGARA
Leaman, Ryan; Erkal, Denis; Voggel, Karina T. +23 more
Aims: In this work we study the striking case of a narrow blue stream with a possible globular cluster-like progenitor around the NGC 7241 galaxy and its foreground dwarf companion. We want to figure out if the stream was generated by tidal interaction with NGC 7241 or if it first interacted with the foreground dwarf companion and later both …
Asteroid spin and shape properties from Gaia DR3 photometry
Mignard, F.; Tanga, P.; Cellino, A. +1 more
Context. The third data release of Gaia, in June 2022, included the first large sample of sparse photometric data for more than 150 000 Solar System objects (SSOs), mainly asteroids.
Aims: The SSO photometric data can be processed to derive information on the physical properties for a large number of objects, including spin properties, surfac…
Yellow hypergiant V509 Cas: Stable in the `yellow void'
Kolka, I.; Kasikov, A.; Aret, A. +2 more
Context. The yellow hypergiant star
Sublimation of volatiles from H2O:CO2 bulk ices in the context of comet 67P/Churyumov-Gerasimenko. II. Noble gases
Wurz, P.; Altwegg, K.; Rubin, M. +6 more
Context. The ROSINA instrument on board the Rosetta spacecraft measured, among others, the outgassing of noble gases from comet 67P/Churyumov-Gerasimenko. The interpretation of this dataset and unravelling underlying desorption mechanisms requires detailed laboratory studies.
Aims: We aim to improve our understanding of the desorption pattern…
A star under multiple influences. Magnetic activity in V815 Her, a compact 2+2 hierarchical system
Strassmeier, K. G.; Weber, M.; Granzer, T. +7 more
Context. Close binaries with magnetically active components are astrophysical laboratories for studying the effects of binarity on activity. Of particular interest are binary and multiple star systems that contain a solar-type active component with an internal structure similar to the Sun, allowing us to study how the dynamo of a solar-type star w…
A study of two young multipolar planetary nebulae: Hen 2-73 and Hen 2-96
Wen, Shibo; Wang, Yong-Zhi; Hsia, Chih-Hao +4 more
We perform an infrared (IR) spectral and visible morphological study of two young planetary nebulae (YPNe) Hen 2-73 and Hen 2-96 using archival Spitzer Space Telescope and Hubble Space Telescope (HST) observations to understand their dust properties and nebular structures. High-resolution HST images of these nebulae show several bipolar lobes and …
The miniJPAS survey. Optical detection of galaxy clusters with PZWav
Finoguenov, A.; Hernán-Caballero, A.; Mendes de Oliveira, C. +21 more
Context. Galaxy clusters are an essential tool to understand and constrain the cosmological parameters of our universe. Thanks to its multi-band design, J-PAS offers a unique group and cluster detection window using precise photometric redshifts and sufficient depths.
Aims: We produced galaxy cluster catalogues from miniJPAS, which is a pathf…
The giant outburst of EXO 2030+375. II. Broadband spectroscopy and evolution
Wolff, M. T.; Wilms, J.; Pottschmidt, K. +13 more
In 2021, the high-mass X-ray binary EXO 2030+375 underwent a giant X-ray outburst, the first since 2006, that reached a peak flux of ∼600 mCrab (3-50 keV). The goal of this work is to study the spectral evolution over the course of the outburst, search for possible cyclotron resonance scattering features (CRSFs), and to associate spectral componen…
Impact of α enhancement on the asteroseismic age determination of field stars. Application to the APO-K2 catalogue
Valle, G.; Dell'Omodarme, M.; Prada Moroni, P. G. +1 more
Aims: We investigated the theoretical biases affecting the asteroseismic grid-based estimates of stellar mass, radius, and age in the presence of a mismatch between the heavy element mixture of observed stars and stellar models.
Methods: We performed a controlled simulation adopting a stellar effective temperature, [Fe/H], an average lar…