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X-Ray Spectra from Weakly Magnetized Accretion Flows
Pe'er, Asaf; Wallace, John
In this paper, we expand upon previous work that argued for the possibility of a subequipartition magnetic field in the accretion flow of a black hole binary system. Using X-ray observations of the three well-known sources A0620-00, XTE J1118+480, and V404 Cyg during the quiescent state, we compare the theoretically expected spectral shape with th…
WX Cen is X‑ray quiet: Does this signify a high‑mass or a low‑mass binary?
Zhekov, Svetozar A.
We present results from analysis of the XMM–Newton observation (2021 February) of the enigmatic object WX Cen: a presumed massive Wolf–Rayet (WR) binary, (WN3 + WC4), or a low‑mass binary. WX Cen was not detected in X‑rays. Its UV emission shows periodic variability with a period (0.405–0.434 day) similar to that found in the optical for this obje…
The orbital architecture and stability of the µ Arae planetary system
Goździewski, K.
We re-analyse the global orbital architecture and dynamical stability of the HD 160691 planetary system. We have updated the best-fitting elements and minimal masses of the planets based on literature precision radial velocity (RV) measurements, now spanning 17.3 yr. This is twice the RVs interval used for the first characterization of the system …
Hunting for overlooked eccentric eclipsing binaries from ASAS-3 survey
Khalikova, A. V.; Gaynullina, E. R.; Serebryanskiy, A. V.
We present the results of searching for new candidates of eclipsing binaries with eccentric orbits in the ASAS Catalog of Variable Stars (ACVS) using publicly available data from the All Sky Automated Survey (ASAS) and the Transiting Exoplanet Survey Satellite (TESS). Unsupervised machine learning techniques were applied to find anomalies among th…
Characterising the orbit and circumstellar environment of the high-mass binary MWC 166 A
Mérand, Antoine; Monnier, John D.; Lanthermann, Cyprien +13 more
Context. Stellar evolution models are highly dependent on accurate mass estimates, especially for highly massive stars in the early stages of stellar evolution. The most direct method for obtaining model-independent stellar masses is derivation from the orbit of close binaries.
Aims: Our aim was to derive the first astrometric plus radial vel…
A novel method for lunar elemental abundance estimation using Chandrayaan-2 class and Chandrayaan-1 M3 data
Bhatt, Megha; Bhardwaj, Anil; Narendranath, Shyama +3 more
We report the first employment of the Chandryaan-2 Large Area Soft X-ray Spectrometer (CLASS) data [1] from Chandrayaan-2 mission as ground truth to estimate SiO2, Al2O3, and MgO for understanding the petrological characteristics of the Moon. The algorithm uses multivariate regression between CLASS derived elemental abundances from selected region…
Kinematic Classification of Coronal Mass Ejections in LASCO C3 Field of View
Moon, Yong-Jae; Lee, Harim; Cho, Il-Hyun +2 more
In this study, we perform a statistical investigation of the kinematic classification of 4264 coronal mass ejections (CMEs) from 1996 to 2015 observed by SOHO/LASCO C3. Using the constant acceleration model, we classify these CMEs into three groups: deceleration, constant velocity, and acceleration motion. For this, we devise three different class…
Plasma dynamics in the flaring loop observed by RHESSI
Kołomański, S.; Mrozek, T.; Falewicz, R. +1 more
Context. Hard X-rays (HXRs) contain the most direct information about the non-thermal electron population in solar flares. The approximation of the HXR emission mechanism (bremsstrahlung), known as the thick-target model, is well developed. It allows one to diagnose the physical conditions within a flaring structure. The thick-target model predict…
UGPS J194310+183851: an unusual optical and X-ray faint cataclysmic variable?
Maccarone, T. J.; Cooper, W. J.; Lucas, P. W. +7 more
The growing number of multi-epoch optical and infrared sky surveys are uncovering unprecedented numbers of new variable stars, of an increasing number of types. The short interval between observations in adjacent near-infrared filters in the UKIDSS Galactic Plane Survey (UGPS) allows for the discovery of variability on the time-scale of minutes. W…
Observaciones del remanente de supernova G296.5+10.0 con el satélite XMM-Newton
Combi, J. A.; Eppens, L. K.; Reynoso, E. M.
G296.5+10.0 is a 90' × 65'-size supernova remnant (SNR) that displays a bilateral distribution in the radio band with the symmetry axis perpendicular to the Galactic Plane. The remnant shows two emission peaks at the South-East and South-West of the radio shell. In addition, the EXOSAT instrument detected an extended X-ray plasma with an axisymmet…