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NSVS 14256825: Period variation and orbital stability analysis of two possible substellar companions
Zervas, K.; Christopoulou, P. -E.
Context. Recent period investigations of the post-common envelop binary (PCEB) NSVS 14256825 suggest that two circumbinary companions are necessary to explain the observed eclipse timing variations (ETVs). Aims. Our objective in this work was to search for the best-fitting curve of two LTTE terms of the ETV diagram by implementing a grid search op…
Massive clumps in W43-main: Structure formation in an extensively shocked molecular cloud
Liu, H. B.; Menten, K. M.; Csengeri, T. +11 more
Aims: W43-main is a massive molecular complex undergoing starburst activities, located at the interaction of the Scutum arm and the Galactic bar. We aim to investigate the gas dynamics, in particular, the prevailing shock signatures from cloud to clump scales. We also look to assess the impact of shocks on the formation of dense gas and early…
Methodology for obtaining the relative orbit and individual masses of Gaia astrometric binaries
Pérez-Couto, X.; Docobo, J. Á.; Campo, P. P.
Context. The recent Gaia Data Release 3 has revealed a catalogue of more than eight hundred thousand binary systems. The release provides orbital solutions for half of the systems, with the majority of them being unresolved astrometric binaries. However, some astrophysical parameters are still unknown for most of them, such as the spectral type an…
Detecting stellar activity cycles in p-mode travel times. Proof of concept using SOHO/VIRGO solar observations
Gizon, L.; Vasilyev, V.
Context. The 11 yr solar cycle is known to affect the global modes of solar acoustic oscillations. In particular, p mode frequencies increase with solar activity.
Aims: We propose a new method to detect the solar cycle from the p-mode autocorrelation function, and we validate this method using VIRGO/SPM photometric time series from solar cycl…
A variety of binary targets for small telescopes
Miroshnichenko, A. S.; Zharikov, S.; Danford, S. +10 more
Results are reviewed of a long-term program of binary systems observing since 2013 at the 0.81 m telescope of the Three College Observatory in North Carolina, USA, with an échelle spectrograph at a medium spectral resolution. The target list includes recognized and suspected binary systems with normal stars (no spectral lines in emission), classic…
The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. II. Expanded cluster sample and final membership selection
Prusti, T.; Gilmore, G.; Montes, D. +25 more
Context. The Li abundance observed in pre-main sequence and main sequence late-type stars is strongly age-dependent, but also shows a complex pattern depending on several parameters, such as rotation, chromospheric activity, and metallicity. The best way to calibrate these effects, and with the aim of studying Li as an age indicator for FGK stars,…
Searching for triple systems unbound by supernovae
Kochanek, Christopher S.; Barboza, Karina
A large fraction of massive stars are found in higher order systems where the presence of a tertiary may significantly modify the system's evolution. In particular, it can lead to increased numbers of compact object binaries and accelerate their mergers with important implications for gravitational wave observations. Using Gaia, we constrain the n…
Near-infrared Spectroscopy for Remote Sensing of Porosity, Density, and Cubicity of Crystalline and Amorphous H2O Ices in Astrophysical Environments
Tonauer, Christina M.; Köck, Eva-Maria; Henn, Raphael +8 more
We present laboratory spectra of pure amorphous and crystalline H2O ices in the near-infrared (NIR, 1–2.5 µm/10,000–4000 cm‑1) at 80–180 K. The aim of this study is to provide spectroscopic reference data that allow remotely accessing ice properties for icy objects such as icy moons, cometary ice, or Saturn rings. Speci…
The possible dual nature of the asteroid (12499) 1998 FR47
Borisov, G.; Kostov, A.; Todorović, N. +2 more
We present the R-band lightcurves of the Flora family asteroid (12499) 1998 FR47, obtained in 2022 at two different astronomical sites: Bulgarian National Astronomical Observatory Rozhen (MPC Code 071) and Astronomical Station Vidojevica (MPC Code C89). The quadramodal lightcurves reveal a rotation period of 6.172±0.003 h and an amplitude of about…
Directional discontinuities in the inner heliosphere from Parker Solar Probe and Solar Orbiter observations
Szabo, A.; Opitz, A.; Nemeth, Z. +5 more
Context. Directional discontinuities (DDs) are common structures in the solar wind plasma and are among the most important discontinuities besides shock waves. The Parker Solar Probe and Solar Orbiter spacecraft currently provide whole new insight into the inner heliosphere in spatial coverage and timescales. Aims. We search for DDs and classify t…