Search Publications
The binary system of the spinning-top Be star Achernar
Klement, Robert; Rivinius, Thomas; Mérand, Antoine +16 more
Context. Achernar, the closest and brightest classical Be star, presents rotational flattening, gravity darkening, occasional emission lines due to a gaseous disk, and an extended polar wind. It is also a member of a close binary system with an early A-type dwarf companion.
Aims: We aim to determine the orbital parameters of the Achernar syst…
Dust scattering halo around the CCO in HESS J1731-347: A detailed analysis
Pühlhofer, G.; Doroshenko, V.; Landstorfer, A.
The supernova remnant (SNR) HESS J1731−347 is one of the few objects exhibiting emission up to the TeV energy band and it stands as a prime target for the study of cosmic ray acceleration in SNRs. It also hosts a central compact object (CCO), which is of interest in the context of the ultra-dense matter equation of state in neutron stars. For both…
Sudden depletion of Alfvénic turbulence in the rarefaction region of corotating solar wind high-speed streams at 1 AU: Possible solar origin?
Pietropaolo, E.; Bruno, R.; Marino, R. +2 more
A canonical description of a corotating solar wind high-speed stream in terms of velocity profile would indicate three main regions: a stream interface or corotating interaction region characterized by a rapid increase in flow speed and by compressive phenomena that are due to dynamical interaction between the fast wind flow and the slower ambient…
Recent star formation history of the dwarf irregular galaxy Leo A
Stonkutė, Rima; Vansevičius, Vladas; Leščinskaitė, Alina
Context.
KMHK 1762: Another star cluster in the Large Magellanic Cloud age gap
Cignoni, M.; Tosi, M.; Ripepi, V. +11 more
Context. The star cluster (SC) age distribution of the Large Magellanic Cloud (LMC) exhibits a gap from ∼4 to 10 Gyr ago, with an almost total absence of SCs. Within this age gap, only two confirmed SCs have been identified hitherto. Nonetheless, the star field counterpart does not show the same characteristics, making the LMC a peculiar galaxy wh…
Orbital and atmospheric parameters of two wide O-type subdwarf binaries: BD−11o162 and Feige 80
Németh, Péter; Tkachenko, Andrew; van Winckel, Hans +4 more
Context. There are 23 long-period binary systems discovered to date that contain a B-type hot subdwarf whose orbital parameters have been fully solved. They evolve into O-type subdwarfs (sdO) once the helium burning transitions from the core to the He shell. Their study will help constraint parameters on the formation and evolution of these binari…
An intermediate polar candidate toward the Galactic plane
Campana, S.; Haberl, F.; Ponti, G. +5 more
Context. For the past decade, it has been suggested that intermediate polars (IPs), a subclass of magnetic cataclysmic variables (CVs), are one of the main contributors to the hard diffuse X-ray emission from the Galactic center (GC) and Galactic ridge.
Aims: In our ongoing XMM-Newton survey of the central region of the Galactic disk (20° ×2°…
Analytic modeling of recurrent Forbush decreases caused by corotating interaction regions
Vršnak, B.; Dumbović, M.; Heber, B. +1 more
Context. On scales of days, the galactic cosmic ray (GCR) flux is affected by coronal mass ejections and corotating interaction regions (CIRs), causing so-called Forbush decreases and recurrent Forbush decreases (RFDs), respectively.
Aims: We explain the properties and behavior of RFDs recorded at about 1 au that are caused by CIRs generated …
Spectroscopic observation of a transition region network jet
Peter, H.; Chitta, L. P.; Gorman, J.
Aims: Ubiquitous transition region (TR) network jets are considered to be substantial sources of mass and energy to the corona and solar wind. We conduct a case study of a network jet to better understand the nature of mass flows along its length and the energetics involved in its launch.
Methods: We present an observation of a jet with …
HD 60431, the CP2 star with the shortest rotational period. Physical parameters and period analysis
Paunzen, E.; Bernhard, K.; Hümmerich, S. +5 more
Context. CP2 stars show periodic photometric, spectroscopic, and magnetic variations with the rotational period. They are generally slow rotators, with rotational periods exceeding half a day, except for the late B-type star HD 60431, which has an unusually short rotational period of 0.4755 days. As slow rotation is deemed a necessary criterion fo…