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Coronae of stars with supersolar elemental abundances
Behar, Ehud; Peretz, Uria; Drake, Stephen A.
Coronal elemental abundances are known to deviate from the photospheric values of their parent star, with the degree of deviation depending on the first ionization potential (FIP). This study focuses on the coronal composition of stars with supersolar photospheric abundances. We present the coronal abundances of six such stars: 11 LMi, ι Hor, HR 7…
Discovery of an optical and X-ray synchrotron jet in NGC 7385
Birkinshaw, M.; Worrall, D. M.; Rawes, J.
We report the discovery of optical and X-ray synchrotron emission from the brighter radio jet in galaxy NGC 7385 using data from HST and Chandra. The jet has a projected length of 5 kpc and a similar morphology to other known optical jets in low-power radio galaxies. We also report a strong jet-cloud interaction which appears to be deflecting the …
The use of the Poynting vector in interpreting ULF waves in magnetospheric waveguides
Wright, A. N.; Elsden, T.
We numerically model ultralow frequency (ULF) waves in the magnetosphere assuming an ideal, low-β, inhomogeneous plasma waveguide. The waveguide is based on the hydromagnetic box model. We develop a novel boundary condition that drives the magnetospheric boundary by pressure perturbations, in order to simulate solar wind dynamic pressure fluctuati…
Improved prediction of accessible surface area results in efficient energy function application
Iqbal, Sumaiya; Mishra, Avdesh; Hoque, Md Tamjidul
An accurate prediction of real value accessible surface area (ASA) from protein sequence alone has wide application in the field of bioinformatics and computational biology. ASA has been helpful in understanding the 3-dimensional structure and function of a protein, acting as high impact feature in secondary structure prediction, disorder predicti…
The infrared and molecular environment surrounding the Wolf-Rayet star WR 130
Noriega-Crespo, A.; Cichowolski, S.; Pineault, S. +3 more
We present a study of the molecular CO gas and mid/far-infrared radiation arising from the environment surrounding the Wolf-Rayet (WR) star 130. We use the multiwavelength data to analyse the properties of the dense gas and dust, and its possible spatial correlation with that of young stellar objects (YSOs). We use 12CO J=1-0 data from …
Improved outer boundary conditions for outer radiation belt data assimilation using THEMIS-SST data and the Salammbo-EnKF code
Daglis, I. A.; Maget, V.; Sicard-Piet, A. +4 more
Over the last decade, efforts have been made in the radiation belt community to develop data assimilation tools in order to improve the accuracy of radiation belts models. In this paper we present a new method to correctly take into account the outer boundary conditions at L* = 8 in such an enhanced model of the radiation belts. To do that we base…
X-ray Emission from Stellar Jets by Collision against High-density Molecular Clouds: an Application to HH 248
Miceli, M.; Orlando, S.; Bonito, R. +6 more
We investigate the plausibility of detecting X-ray emission from a stellar jet that impacts a dense molecular cloud, a scenario that may be typical for classical T Tauri stars with jets in dense star-forming complexes. We first model the impact of a jet against a dense cloud using two-dimensional axisymmetric hydrodynamic simulations, exploring di…
Discovery of blue companions to two southern Cepheids: WW Car and FN Vel
Kovtyukh, V.; Szabados, L.; Chekhonadskikh, F. +2 more
A large number of high-dispersion spectra of classical Cepheids were obtained in the region of the Ca II H+K spectral lines. The analysis of these spectra allowed us to detect the presence of a strong Balmer line, Hɛ, for several Cepheids, interpreted as the signature of a blue companion: the presence of a sufficiently bright blue companion to the…
The Hyperfine Structure of the Rotational Spectrum of HDO and its Extension to the THz Region: Accurate Rest Frequencies and Spectroscopic Parameters Forastrophysical Observations
Puzzarini, Cristina; Lattanzi, Valerio; Cazzoli, Gabriele +2 more
The rotational spectrum of the mono-deuterated isotopologue of water, HD16O, has been investigated in the millimeter- and submillimeter-wave frequency regions, up to 1.6 THz. The Lamb-dip technique has been exploited to obtain sub-Doppler resolution and to resolve the hyperfine (hf) structure due to the deuterium and hydrogen nuclei, th…
Extended, Dusty Star Formation Fueled by a Residual Cooling Flow in the Cluster of Galaxies Sérsic 159-03
Veilleux, S.; McDonald, M.; Werner, N. +1 more
While the cooling of the hot intracluster medium (ICM) in the cores of galaxy clusters is mostly counteracted by heating from the central active galactic nucleus (AGN), the balance is not perfect. This can lead to residual cooling flows and low-level star formation, the physics of which is not well understood. Here we present a detailed study of t…