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Variable absorption line in XTE J1810-197
Göğüş, Ersin; Güver, Tolga; Vurgun, Eda +1 more
We report the results of a long-term spectral and timing study of the first transient magnetar, XTE J1810-197 which was discovered in 2003, when its X-ray luminosity increased ≈ 100 fold. We fit X-ray spectra of all archival X-ray observations using a two-component blackbody model, where the cool component is most likely originating from the whole…
Properties and nature of Be stars. 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357
Frémat, Y.; Harmanec, P.; Yang, S. +10 more
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 binaries. It is not easy, however, due to the presence of circumstellar matter. Here, we report the first detailed investigation of a new representative of this class o…
Red-skewed Kα iron lines in GX 13+1
Maiolino, T.; Titarchuk, L.; Frontera, F. +2 more
Context. Broad, asymmetric, and red-skewed Fe Kα emission lines have been observed in the spectra of low-mass X-ray binaries hosting neutron stars (NSs) as a compact object. Because more than one model is able to describe these features, the explanation of where and how the red-skewed Fe lines are produced is still a matter of discussio…
Revisiting the dust properties in the molecular clouds of the Large Magellanic Cloud
Juvela, M.; Ristorcelli, I.; Noriega-Crespo, A. +2 more
Context. Some Galactic molecular clouds show signs of dust evolution as compared to the diffuse interstellar medium, most of the time through indirect evidence such as color ratios, increased dust emissivity, or scattering (coreshine). These signs are not a feature of all Galactic clouds. Moreover, molecular clouds in the Large Magellanic Cloud (L…
Physical properties of the fullerene C60-containing planetary nebula SaSt2-3
Otsuka, Masaaki
We perform a detailed analysis of the fullerene C60-containing planetary nebula (PN) SaSt2-3 to investigate the physical properties of the central star (B0-1II) and nebula based on our own Subaru/HDS spectra and multiwavelength archival data. By assessing the stellar absorption, we derive the effective temperature, surface gravity, and …
Formation of Clays, Ferrihydrite, and Possible Salts in Hydrae Chasma, Mars
Weitz, Catherine M.; Bishop, Janice L.
We used multiple orbital data sets to analyze the morphology, composition, and stratigraphy of clays and other hydrated deposits within Hydrae Chasma. Fe/Mg-smectites are concentrated along the lower floor of the chasma, adjacent to pit craters. There are at least two distinct smectites that vary in their morphology and spectral properties, with a…
A Supernova Remnant Counterpart for HESS J1832-085
Haberl, F.; Filipović, M. D.; Pühlhofer, G. +18 more
We examine the new Galactic supernova remnant (SNR) candidate, G23.11+0.18, as seen by the Murchison Widefield Array radio telescope. We describe the morphology of the candidate and find a spectral index of -0.63 ± 0.05 in the 70-170 MHz domain. Coincident TeV gamma-ray detection in High Energy Stereoscopic System (HESS) data supports the SNR natu…
High Spatial Resolution Thermal Infrared Spectroscopy with ALES: Resolved Spectra of the Benchmark Brown Dwarf Binary HD 130948BC
Spalding, Eckhart; Leisenring, Jarron; Woodward, Charles E. +6 more
We present 2.9-4.1 µm integral field spectroscopy of the L4+L4 brown dwarf binary HD 130948BC, obtained with the Arizona Lenslets for Exoplanet Spectroscopy (ALES) mode of the Large Binocular Telescope Interferometer. The HD 130948 system is a hierarchical triple system, in which the G2V primary is joined by two co-orbiting brown dwarfs. By …
Probing inhomogeneity in the helium ionizing UV background
Kim, Tae-Sun; Syphers, David; Pieri, Matthew M. +1 more
We present an analysis combining the simultaneous measurement of intergalactic absorption by hydrogen ({{H {I}}}), helium ({{He {II}}}), and oxygen ({{O {VI}}}) in UV and optical quasar spectra. The combination of the {{H {I}}} and {{He {II}}} Lyman-alpha forests through η (the ratio of column densities of singly ionized helium to neutral hydrogen…
Optical observations and CYCLOPS post-shock region modelling of the polar V348 Pav
Belloni, Diogo; Rodrigues, Claudia V.; Diaz, Marcos P. +3 more
Post-shock regions (PSR) of polar cataclysmic variables (CVs) produce most of their luminosity and give rise to high circular polarization in optical wavelengths and strong variability on the white dwarf (WD) rotation period, which are distinctive features of these systems. To investigate the polar candidate V348 Pav, we obtained a comprehensive o…