Search Publications
Zonal winds at high latitudes on Venus: An improved application of cyclostrophic balance to Venus Express observations
Read, Peter L.; Mendonça, João M.; Wilson, Colin F. +1 more
Recent retrievals of zonal thermal winds obtained in a cyclostrophic regime on Venus are generally consistent with cloud tracking measurements at mid-latitudes, but become unphysical in polar regions where the values obtained above the clouds are often less than or close to zero. Using a global atmospheric model, we show that the main source of er…
UV spectrum of Enceladus
Noll, Keith S.; Clarke, John T.; Hendrix, Amanda R. +1 more
We present a far ultraviolet (FUV) spectrum of Saturn’s moon Enceladus from the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST). We have put upper limits on emission from C, N, and O lines in Enceladus’ atmosphere and column densities for the C lines assuming solar resonance scattering. We find these upper limits to be relati…
Observation and modelling of main-sequence star chromospheres - XIX. FIES and FEROS observations of dM1 stars
Houdebine, E. R.; Butler, C. J.; Telting, J. +1 more
We present 187 high-resolution spectra for 62 different M1 dwarfs from observations obtained with the FIbre-fed Echelle Spectrograph (FIES) on the Nordic Optical Telescope (NOT) and from observations with the Fibre-fed Extended Range Echelle Spectrograph (FEROS) from the European Southern Observatory (ESO) data base. We also compiled other measure…
Dust shell model of the water fountain source IRAS 16342-3814
Izumiura, H.; Murakawa, K.
Aims: We investigate the circumstellar dust shell of the water fountain source IRAS 16342-3814.
Methods: We performed two-dimensional radiative transfer modeling of the dust shell, taking into account previously observed spectral energy distributions (SEDs) and our new J-band imaging and H- and KS-band imaging polarimetry obta…
Modelling of dust around the symbiotic Mira RR Telescopii during obscuration epochs
Kotnik-Karuza, D.; Jurkic, T.
Context. Symbiotic Miras represent a class of peculiar binaries whose nature is still not well understood. Physical properties of the circumstellar dust and associated physical mechanisms play an important role in understanding the evolution of symbiotic binaries and the interaction between their components. We present a model of inner dust region…
Orbital-phase-resolved Spectroscopy of the Intermediate Polar FO Aqr Using XMM-Newton Observatory Data
Balman, Ş.; Pekön, Y.
We present the orbital-phase-resolved analysis of an archival FO Aqr observation obtained using the X-ray Multi-Mirror Mission, European Photon Imaging Camera (pn instrument). We investigate the variation of the spin pulse amplitudes over the orbital period in order to account for the effects of orbital motion on spin modulation. The semi-amplitud…
Alfvén: magnetosphere—ionosphere connection explorers
Koskinen, H.; Lundin, R.; Yamauchi, M. +60 more
The aurorae are dynamic, luminous displays that grace the night skies of Earth's high latitude regions. The solar wind emanating from the Sun is their ultimate energy source, but the chain of plasma physical processes leading to auroral displays is complex. The special conditions at the interface between the solar wind-driven magnetosphere and the…
Star Formation in LINER Host Galaxies at z ~ 0.3
Berta, Stefano; Pozzi, Francesca; Lutz, Dieter +8 more
We present the results of a Herschel-PACS study of a sample of 97 low-ionization nuclear emission-line regions (LINERs) at redshift z ~ 0.3 selected from the zCOSMOS survey. Of these sources, 34 are detected in at least one PACS band, enabling reliable estimates of the far-infrared L FIR luminosities, and a comparison to the FIR luminos…
Improved luminosity model and albedo for Saturn
Mallama, Anthony
The globe of Saturn is brighter than previously reported as indicated by its absolute opposition magnitudes in the UBVRI band passes which are -7.080, -7.842, -8.914, -9.587 and -9.606, respectively. The geometric albedo in V is 0.501 and it peaks in the R filter at 0.567. The brightest apparent magnitude of the system in the V-band is -0.61 and t…
Observed Effect of Magnetic Fields on the Propagation of Magnetoacoustic Waves in the Lower Solar Atmosphere
Lawrence, J. K.; Cadavid, A. C.
We study Hinode/SOT-FG observations of intensity fluctuations in Ca II H-line and G-band image sequences and their relation to simultaneous and co-spatial magnetic field measurements. We explore the G-band and H-line intensity oscillation spectra both separately and comparatively via their relative phase differences, time delays and cross-coherenc…