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Detailed Abundances of Planet-hosting Open Clusters. The Praesepe (Beehive) Cluster
Stassun, Keivan G.; Schuler, Simon C.; Vejar, George
It is not yet fully understood how planet formation affects the properties of host stars, in or out of a cluster; however, abundance trends can help us understand this process. We present a detailed chemical abundance analysis of six stars in Praesepe, a planet-hosting open cluster. Pr0201 is known to host a close-in (period of 4.4 days) giant pla…
Absolute parameters of the three totally-eclipsing WUMa stars NSVS 2443858, NSVS 780649 and V1098 Her
Popov, Velimir; Acerbi, Francesco; Barani, Carlo
We present the first photometric analysis of three totally-eclipsing W UMa binaries, NSVS 2443858, NSVS 780649 and V1098 Her. The absolute astrophysical parameters of the stellar components were determined by means of Gaia distances and light curve solutions. The results show that: (i) Two of the systems, NSVS 2443858 and V1098 Her, are of A subty…
A Gaia-based Photometric and Kinematic Analysis of the Old Open Cluster King 11
Bisht, D.; Yadav, R. K. S.; Vereshchagin, S. V. +5 more
This paper presents an investigation of an old age open cluster King 11 using Gaia's Early Data Release 3 data. Considering the stars with membership probability (Pµ) > 90%, we identified 676 most probable cluster members within the cluster's limiting radius. The mean proper motion for King 11 is determined as: µx
Evidence for Fe Kα line and soft X-ray lag in NGC 7456 ultraluminous X-ray source-1
Markowitz, Alex; Mondal, Samaresh; De Marco, Barbara +1 more
We report the first detection of an Fe Kα line and soft X-ray lag in the ultraluminous X-ray (ULX) source NGC 7456 ULX-1. The XMM-Newton spectra show the presence of the 6.4 keV Fe line at 2.6σ confidence and an upper limit on the FWHM of 32900 km s-1. Assuming that the line arises by reflection from a Keplerian disk, it must…
Cluster Multi-Probing of the Aurora During Two Decades
Lindqvist, Per-Arne; Marklund, Göran
The Cluster spacecraft, launched in the year 2000, were pioneers using multi-point measurements to explore the dynamic space plasma environment of Earth. This capability offered a new, powerful approach to study in situ fundamental space plasma processes of the solar-terrestrial interaction. Although not a major science objective of the mission, t…
Does Phobos Reflect Solar Wind Protons? Mars Express Special Flyby Operations With and Without the Presence of Phobos
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +1 more
We characterize the solar wind proton reflection (backscattering) from Phobos using a series of Mars Express operations. The plasma data obtained during the Phobos flyby of Mars Express in January 2016 showed a non-solar wind signal possibly reflected from the Phobos surface. Similar signatures were previously reported during an earlier Phobos fly…
Fine structure in the luminosity function in young stellar populations with Gaia DR2
Brown, Anthony G. A.; Kaper, Lex; de Bruijne, Jos H. J. +2 more
Context. A pioneering study showed that the fine structure in the luminosity function (LF) of young star clusters contains information about the evolutionary stage (age) and composition of the stellar population. The notable features include the H-peak, which is the result of the onset of hydrogen burning turning pre-main sequence stars into main …
HADES RV programme with HARPS-N at TNG. XIV. A candidate super-Earth orbiting the M-dwarf GJ 9689 with a period close to half the stellar rotation period
Rebolo, R.; Ribas, I.; Morales, J. C. +27 more
Context. It is now well-established that small, rocky planets are common around low-mass stars. However, the detection of such planets is challenged by the short-term activity of host stars.
Aims: The HARPS-N red Dwarf Exoplanet Survey programme is a long-term project at the Telescopio Nazionale Galileo aimed at monitoring nearby, early-type,…
Spectroscopic Observations of Obscured Populations in the Inner Galaxy: 2MASS-GC02, Terzan 4, and the 200 km s-1 stellar peak
Kunder, Andrea; Debattista, Victor P.; Koch-Hansen, Andreas J. +2 more
The interpretation of potentially new and already known stellar structures located at low latitudes is hindered by the presence of dense gas and dust, as observations toward these sight lines are limited. We have identified Apache Point Observatory Galaxy Evolution Experiment (APOGEE) stars belonging to the low-latitude globular clusters 2MASS-GC0…
First detection of VHE gamma-ray emission from TXS 1515-273, study of its X-ray variability and spectral energy distribution
Maraschi, L.; Covino, S.; Antonelli, L. A. +196 more
We report here on the first multiwavelength (MWL) campaign on the blazar TXS 1515-273, undertaken in 2019 and extending from radio to very-high-energy gamma-rays (VHE). Up until now, this blazar had not been the subject of any detailed MWL observations. It has a rather hard photon index at GeV energies and was considered a candidate extreme high-s…