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Comparison of the PPMXL and UCAC5 Catalogs with the Gaia DR2
Liu, N.; Zhu, Z.; Liu, J. -C. +3 more
Astrometric ground-based catalogs usually suffer from varied systematic errors. These systematic errors were hard to detect because there was no independent reference catalog complete to very faint limiting magnitudes (∼20 mag). This situation has changed since the second data release of the Gaia mission (Gaia DR2). We aim to investigate positions…
Measuring relative abundances in the solar corona with optimised linear combinations of spectral lines
Buchlin, Éric; Zambrana Prado, Natalia
Context. Elemental abundances in some coronal structures differ significantly from photospheric abundances, with a dependence on the first ionization potential (FIP) of the element. Measuring these FIP-dependent abundance biases is important for coronal and heliospheric physics.
Aims: We aim to build a method for optimal determination of FIP …
Knickpoints in Martian channels indicate past ocean levels
Duran, Sergio; Coulthard, Tom J.; Baynes, Edwin R. C.
On Mars, the presence of extensive networks of sinuous valleys and large channels provides evidence for a wetter and warmer environment where liquid water was more abundant than it is at present. We undertook an analysis of all major channel systems on Mars and detected sharp changes in elevation along the river long profiles associated with steep…
Properties of jet and surrounding material of GW/GRB 170817A
Ziaeepour, Houri
We use published data in radio, optical, and X-ray bands to analyse and model afterglows of GW/GRB 170817A. Our analysis is based on a phenomenological gamma-ray burst generator model, which we previously used to study the prompt gamma-ray emission of this important transient. We find a multicomponent model and a few of its variants that are consi…
CCD U B V ( R I ) KC
Oralhan, İnci Akkaya; Michel, Raúl; Karataş, Yüksel +3 more
The open clusters NGC 2323 and NGC 2539 have been analysed using CCD
Dynamic field line draping at comet 67P/Churyumov-Gerasimenko during the Rosetta dayside excursion
Henri, Pierre; Nilsson, Hans; Behar, Etienne +9 more
Context. The Rosetta dayside excursion took place in September-October 2015 when comet 67P/Churyumov-Gerasimenko (67P/CG) was located at 1.36 AU from the Sun after it had passed perihelion on 13 August 2015 at 1.25 AU. At this time, the comet was near its most active period, and its interaction with the solar wind was expected to be at its most in…
Non-linear flow modelling of a Martian Lobate Debris Apron
Schmidt, Louise Steffensen; Hvidberg, Christine Schøtt; Kim, Jung Rack +1 more
XRB continuum fitting with sensitive high-energy X-ray detectors
Fabian, A. C.; Tomsick, J. A.; Buisson, D. J. K. +4 more
The launch of the Nuclear Spectroscopic Telescope Array (NuSTAR) heralded a new era of sensitive high-energy X-ray spectroscopy for X-ray binaries (XRBs). In this paper we show how multiple physical parameters can be measured from the accretion disc spectrum when the high-energy side of the disc spectrum can be measured precisely using NuSTAR. Thi…
Rosetta/OSIRIS observations of the 67P nucleus during the April 2016 flyby: high-resolution spectrophotometry
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +35 more
Context. From August 2014 to September 2016, the Rosetta spacecraft followed comet 67P/Churyumov-Gerasimenko along its orbit. After the comet passed perihelion, Rosetta performed a flyby manoeuvre over the Imhotep-Khepry transition in April 2016. The OSIRIS/Narrow-Angle-Camera (NAC) acquired 112 observations with mainly three broadband filters (ce…
Constraining Stellar Parameters and Atmospheric Dynamics of the Carbon AGB star V Oph
Ohnaka, Keiichi; Carpenter, Kenneth G.; Rau, Gioia +2 more
Molecules and dust produced by the atmospheres of cool evolved stars contribute to a significant amount of the total material found in the interstellar medium. To understand the mechanism behind the mass loss of these stars, it is of pivotal importance to investigate the structure and dynamics of their atmospheres. Our goal is to verify if the ext…