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28 papers · 2 filters
Uncovering a 260 pc wide, 35 Myr old filamentary relic of star formation
Giacomo Beccari, Henri M. J. Boffin, Tereza Jerabkova
Several recent studies have shown that the Vela OB2 region hosts a complex constellation of sub-populations with ages in the range 10 to 50 Myr. Such populations might represent th…
The ASAS-SN Catalog of Variable Stars VII: Contact Binaries are Different Above and Below the Kraft Break
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +11
We characterize W UMa type (EW) contact binaries, including new discoveries, using ASAS-SN -band all-sky light curves along with archival data fr…
The possible role of stellar mergers for the formation of multiple stellar populations in globular clusters
Long Wang, Pavel Kroupa, Koh Takahashi +1
Many possible scenarios for the formation of multiple stellar populations (MSP) in globular clusters (GCs) have been discussed so far, including the involvement of asymptotic giant…
Doubly eclipsing systems
P. Zasche, D. Vokrouhlicky, M. Wolf +6
Aims: Our goal was to increase number of known doubly eclipsing systems such that the resulting dataset would allow to study them via statistical means, as well as prove that they…
The Salpeter IMF and its descendants
Pavel Kroupa, Tereza Jerabkova
The stellar initial mass function (IMF) is the key to understanding the matter cycle in the Universe. Edwin Salpeter's paper of 1955 founded this research field. Evidence today, ho…
The ASAS-SN Catalog of Variable Stars VI: An All-Sky Sample of Scuti Stars
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +10
We characterize an all-sky catalog of Scuti variables in ASAS-SN, which includes new discoveries. Using distances from \textit{Gaia} DR2, we deriv…
Multiple bursts of star formation in young star clusters: The case of the Orion Nebula Cluster
Tereza Jerabkova
Young star clusters (YSCs) with resolved stellar populations are well suited for studying star-cluster formation. In most cases, the (pre-main-sequence) stellar populations found i…
A stellar relic filament in the Orion star forming region
Tereza Jerabkova, Henri M. J. Boffin, Giacomo Beccari +1
We report the discovery of the oldest stellar substructure in the Orion star forming region (OSFR), the Orion relic filament. The relic filament is physically associated with the O…
Manifestations of three dimensional magnetic reconnection in an eruption of a quiescent filament: \\ Filament strands turning to flare loops
Juraj Lorincik, Jaroslav Dudik, Guillaume Aulanier
We report on observations of conversion of bright filament strands into flare loops during 2012 August 31 filament eruption. Prior to the eruption, individual bright strands compos…
TOI-503: The first known brown dwarf-Am star binary from the TESS mission
Ján Šubjak, Rishikesh Sharma, Theron W. Carmichael +76
We report the discovery of an intermediate-mass transiting brown dwarf, TOI-503b, from the TESS mission. TOI-503b is the first brown dwarf discovered by TESS and orbits a metallic-…
On the triple-star origin of the planetary nebula Sh 2-71
David Jones, Ondrej Pejcha, Romano L. M. Corradi
Recent studies have indicated that triple star systems may play a role in the formation of an appreciable number of planetary nebulae, however only one triple central star is known…
V348 And and V572 Per: Bright Triple Systems with Eccentric Eclipsing Binaries
P. Zasche, R. Uhlar, P. Svoboda +5
The eclipsing binaries are still important objects for our understanding of the universe. Especially these ones located within the more complex multiple systems can help us solving…
Comparison of time-distance inversion methods applied to SDO/HMI Dopplergrams
David Korda, Michal Švanda, Junwei Zhao
We compared the results from the JSOC pipeline for horizontal flow components and the perturbations of the speed of sound at set of depths with equivalent results from an independe…
Properties and nature of Be stars 31. The binary nature, light variability, physical elements, and emission-line changes of HD~81357
P. Koubský, P. Harmanec, M. Brož +10
Reliable determination of the basic physical properties of hot emission-line binaries with Roche-lobe filling secondaries is important for developing the theory of mass exchange in…
Kinematics of Mass Loss from the Outer Lagrange Point L2
Dominika Hubova, Ondrej Pejcha
We investigate kinematics of mass loss from the vicinity of the second Lagrange point L2 with applications to merging binary stars, common envelope evolution and the associated tra…
The EREBOS project -- Investigating the effect of substellar and low-mass stellar companions on late stellar evolution
V. Schaffenroth, B. N. Barlow, S. Geier +14
Eclipsing post-common envelope binaries are highly important for resolving the poorly understood, very short-lived common envelope phase. Most hot subdwarfs (sdO/Bs) are the bare H…
The ASAS-SN Catalog of Variable Stars V: Variables in the Southern Hemisphere
T. Jayasinghe, K. Z. Stanek, C. S. Kochanek +13
The All-Sky Automated Survey for Supernovae (ASAS-SN) provides long baseline ( yrs) light curves for sources brighter than V mag across the whole sky. As part…
Directly testing gravity with Proxima Centauri
Indranil Banik, Pavel Kroupa
The wide binary orbit of Proxima Centauri around Centauri A and B differs significantly between Newtonian and Milgromian dynamics (MOND). By combining previous calculations of…
The ASAS-SN Catalog of Variable Stars IV: Periodic Variables in the APOGEE Survey
Michal Pawlak, O. Pejcha, P. Jakubcik +12
We explore the synergy between photometric and spectroscopic surveys by searching for periodic variable stars among the targets observed by the Apache Point Observatory Galactic Ev…
Velocities of flare kernels and the mapping norm of field line connectivity
Juraj Lörinčík, Guillaume Aulanier, Jaroslav Dudík +2
We report on observations of flare ribbon kernels during the 2012 August 31 filament eruption. In the 1600\,Å and 304\,Å channels of the Atmospheric Imaging Assembly, flare kernels…
HD 99458: First time ever Ap-type star as a Scuti pulsator in a short period eclipsing binary?
M. Skarka, P. Kabáth, E. Paunzen +18
We present the discovery of a unique object, a chemically peculiar Ap-type star showing Scuti pulsations which is bound in an eclipsing binary system with an orbital period sho…
When the tale comes true: multiple populations and wide binaries in the Orion Nebula Cluster
Tereza Jerabkova, Giacomo Beccari, Henri M. J. Boffin +5
The high-quality OmegaCAM photometry of the 3x3 deg around the Orion Nebula Cluster (ONC) in r, and i filters by Beccari et al.(2017) revealed three well-separated pre-main sequenc…
Modeling of interactions between supernovae ejecta and aspherical circumstellar environments
Petr Kurfürst, Jiří Krtička
Massive stars are characterized by a significant loss of mass either via spherically symmetric stellar winds or pre-explosion pulses, or by aspherical forms of circumstellar matter…
A new look into putative duplicity and pulsations of the Be star CMi
P. Harmanec, M. Svanda, D. Korcakova +6
Bright Be star beta CMi has been identified as a non-radial pulsator on the basis of space photometry with the MOST satellite and also as a single-line spectroscopic binary with a…