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The complications of learning from Super Soft Source X-ray spectra
Ness, Jan-Uwe
Super Soft X-ray Sources (SSS) are powered by nuclear burning on the surface of an accreting white dwarf, they are seen around 0.1-1 keV (thus in the soft X-ray regime), depending on effective temperature and the amount of intervening interstellar neutral hydrogen (NH). The most realistic model to derive physical parameters from observe…
See Change: VLT spectroscopy of a sample of high-redshift Type Ia supernova host galaxies
Rubin, D.; Aldering, G.; Goobar, A. +10 more
The Supernova Cosmology Project has conducted the 'See Change' programme, aimed at discovering and observing high-redshift (1.13 ≤ z ≤ 1.75) Type Ia supernovae (SNe Ia). We used multifilter Hubble Space Telescope (HST) observations of massive galaxy clusters with sufficient cadence to make the observed SN Ia light curves suitable for a cosmologica…
A Beginner's Guide to Working with Astronomical Data
Pössel, Markus
This elementary review covers the basics of working with astronomical data, notably with images, spectra and higher-level (catalog) data. The basic concepts and tools are presented using both application software (DS9 and TOPCAT) and Python. The level of presentation is suitable for undergraduate students, but should also be accessible to advanced…
An extensive spectroscopic time series of three Wolf-Rayet stars - II. A search for wind asymmetries in the dust-forming WC7 binary WR137
Garrel, T.; Knapen, J. H.; Mauclaire, B. +39 more
We present the results of a 4-month, spectroscopic campaign of the Wolf-Rayet dust-making binary, WR137. We detect only small-amplitude random variability in the C III λ5696 emission line and its integrated quantities (radial velocity, equivalent width, skewness, and kurtosis) that can be explained by stochastic clumps in the wind of the WC star. …
A new method for determining the total electron content in Mars' ionosphere based on Mars Express MARSIS data
Witasse, Olivier; Sánchez-Cano, Beatriz; Kofman, Wlodek +5 more
We present a new method for determining the total electron content (TEC) in the Martian ionosphere based on the time delay of received radar pulses of the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) on board the Mars Express spacecraft. Previous studies of the same dataset have produced differing results for the day-side i…
Phase-resolved Analyses of Millihertz Quasi-periodic Oscillations in 4U 1636-53 using the Hilbert-Huang Transform
Chou, Yi; Hsieh, Hung-En
We present phase-resolved spectroscopy based on the Hilbert-Huang transform (HHT) for millihertz quasi-periodic oscillations (mHz QPOs) in 4U 1636-53. The ∼8 mHz QPO can be detected approximately several thousand seconds before a type-I X-ray burst. It has been interpreted as marginally stable burning on the neutron-star surface. In this study, we…
A rare case of FR I interaction with a hot X-ray bridge in the A2384 galaxy cluster
Durret, F.; Parekh, V.; Laganá, T. F. +3 more
Clusters of varying mass ratios can merge and the process significantly disturbs the cluster environments and alters their global properties. Active radio galaxies are another phenomenon that can also affect cluster environments. Radio jets can interact with the intracluster medium (ICM) and locally affect its properties. Abell 2384 (hereafter A23…
Investigation on the mass transferring near-contact binary TT Cet
Tian, Xiao-Man; Chang, Lin-Feng
First multi-colour complete light curves and low-resolution spectra of short-period eclipsing binary TT Cet are presented. The stellar atmospheric parameters of the primary star were derived through spectra fitting as: $T_{eff}=7 091±124 {K}$, $\log g = 4.15±0.33 {cm}/s^2$, and $[Fe/H]=-0.23±0.04 dex$. The light curves were analysed using the Wils…
Numerical Analysis of Shock Layer Ionization during the Entry of the Schiaparelli Spacecraft into the Martian Atmosphere
Surzhikov, S. T.
The paper presents a numerical analysis of aerophysical nonequilibrium processes occurring near the surface of the Schiaparelli entry vehicle in the region of hypersonic flight in the dense Martian atmosphere. The two-dimensional model realized is based on the system of self-consistent equations of nonequilibrium physical and chemical mechanics of…
Orbits for Eight Binaries
Cvetković, Z.; Pavlović, R.
The subject of the present paper is the analysis of the orbital solutions for eight binaries: WDS 02402+0436 = HDS 347, WDS 02552+5950 = MLR 520, WDS 03119+6131 = HDS 407, WDS 04570+7350 = YSC 145, WDS 05202+4105 = HDS 701, WDS 06467+0822 = HDS 940AB, WDS 08259-1623 = HDS 1199, and WDS 22550+5132 = HU 785. Seven orbits are determined for the first…