Search Publications
Ground-Based Observations of the ZZ Ceti Star HS 1625+1231
Sódor, Á.; Kalup, Cs; . Bognár, Zs.
We present the results of our detailed light curve analysis of the ZZ Ceti star HS 1625+1231. We collected photometric time series data at Konkoly Observatory on 14 nights, and performed Fourier analysis of these data sets. We detected 11 significant frequencies, where six of them are found to be independent pulsation modes in the 514-881 s period…
Divergence and Vorticity of Subsurface Flows During Solar Cycles 23 and 24
Howe, R.; Komm, R.; Hill, F.
We study the solar-cycle variation of the divergence and vorticity of subsurface horizontal flows from the surface to a depth of 16 Mm. The flows were derived with ring-diagram analysis applied to Michelson Doppler Imager (MDI) Dynamics Program, Global Oscillation Network Group (GONG), and Helioseismic and Magnetic Imager (HMI) Dopplergrams. We st…
First detection of a disk free of volatile elements around a young A-type star: A possible sign of collisions between rocky planets
Manara, C. F.; Miles-Páez, P. A.; van den Ancker, M. E. +7 more
Aims: We present the first detailed analysis of the astrophysical parameters of the poorly studied Sco-Cen member HD 152384 and its circumstellar environment.
Methods: We analyse newly obtained optical-near-IR X-shooter spectra, as well as archival TESS data, of HD 152384. In addition, we use literature photometric data to construct a de…
IllustrisTNG and S2COSMOS: possible conflicts in the evolution of neutral gas and dust
Smith, Matthew W. L.; Gomez, Haley L.; Millard, Jenifer S. +3 more
We investigate the evolution in galactic dust mass over cosmic time through (i) empirically derived dust masses using stacked submillimetre fluxes at 850 µm in the COSMOS field and (ii) dust masses derived using a robust post-processing method on the results from the cosmological hydrodynamical simulation IllustrisTNG. We effectively perform…
Atomic structure for carbon-like ions from Na VI to Ar XIII
Almodlej, A.; Alrashed, H.; Ben Nessib, N. +1 more
We have calculated the energy levels, oscillator strengths, and transition probabilities for eight carbon-like ions (Na VI, Mg VII, Al VIII, Si IX, P X, S XI, Cl XII and Ar XIII) using the Hartree-Fock pseudo-relativistic (HFR) and Thomas-Fermi-Dirac-Amaldi (TFDA) approaches. We used configuration expansions containing eight configurations, namely…
Destruction of Galaxies as a Cause of the Appearance of Stellar Streams
Vereshchagin, S. V.; Tutukov, A. V.; Sizova, M. D.
The interaction of galaxies in clusters with the intergalactic gaseous medium and other galaxies is considered. The causes for the appearance of gaseous and stellar "tails" and stellar "copies" of galaxies during their movement in a dense gaseous medium in the cores of clusters and during the tidal destruction of colliding galaxies are studied. Th…
Spatial Distribution of O VI Covering Fractions in the Simulated Circumgalactic Medium
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +6 more
We use adaptive mesh refinement cosmological simulations to study the spatial distribution and covering fraction of ${\rm{O}}\,{\rm\small{VI}}$ absorption in the circumgalactic medium (CGM) as a function of projected virial radius and azimuthal angle. We compare these simulations to an observed sample of 53 galaxies from the Multiphase Galaxy Halo…
The nature of bright C-complex asteroids
Hasegawa, Sunao; Usui, Fumihiko; Kuroda, Daisuke +1 more
Most C-complex asteroids have albedo values less than 0.1, but there are some high-albedo (bright) C-complex asteroids with albedo values exceeding 0.1. To reveal the nature and origin of bright C-complex asteroids, we conducted spectroscopic observations of the asteroids at visible and near-infrared wavelengths. As a result, the bright B-, C-, an…
The Statistical Morphology of Saturn's Equatorial Energetic Neutral Atom Emission
Mitchell, D. G.; Paranicas, C.; Badman, S. V. +6 more
Saturn's magnetosphere is an efficient emitter of energetic neutral atoms (ENAs), created through charge exchange of energetic ions with the extended neutral cloud originating from the icy moon Enceladus. We present an analysis using the complete image set captured by Cassini's Ion Neutral Camera to characterize Saturn's average ENA morphology. Co…
The ROSAT Raster survey in the north ecliptic pole field. X-ray catalogue and optical identifications
Moneti, A.; Hasinger, G.; Capak, P. +4 more
The north ecliptic pole (NEP) is an important region for extragalactic surveys. Deep and wide contiguous surveys are being performed by several space observatories, most currently with the eROSITA telescope. Several more are planned for the near future. We analyse all the ROSAT pointed and survey observations in a region of 40 deg2 arou…