Search Publications
The 50-100 pc scale parent stellar populations of Type II supernovae and limitations of single star evolution models
Galbany, L.; Anderson, J.; Schady, P. +4 more
There is observational evidence of a dearth in core-collapse supernova (ccSN) explosions from stars with zero-age main-sequence (ZAMS) mass M0 ≈ 17-30M⊙, referred to as the `red supergiant problem'. However, simulations now predict that above 20 M⊙ we should indeed only expect stars within certain pockets of M…
Flow Structure in the Eclipsing Polar V808 Aur. Results of 3D Numerical Simulations
Bisikalo, D. V.; Zhilkin, A. G.; Gabdeev, M. M. +1 more
The structure of the flows in the eclipsing polar V808 Aur is studied. Comparison of computations with observed light curves is used to identify and clarify a number of features in the system, such as the drift of the hot spot—the place where the stream from the inner Lagrange point approaches the surface of the white dwarf, changes in the brightn…
Spectroscopic binaries RV Tauri and DF Cygni
Bowman, Dominic M.; Manick, Rajeev; Van Winckel, Hans +7 more
Context. Some RV Tauri stars show a long-term photometric variability in their mean magnitudes. DF Cygni (DF Cyg), the only RV Tauri star in the original Kepler field, and the prototype RV Tauri (RV Tau) are two such stars.
Aims: The focus of this paper is on two famous but still poorly understood RV Tauri stars: RV Tau and DF Cyg. We aim to …
Studies of irregular satellites: I. Lightcurves and rotation periods of 25 Saturnian moons from Cassini observations
Mottola, Stefano; Denk, Tilmann
Disk-integrated time-resolved photometric observations have been performed for 25 irregular moons of Saturn with the ISS camera of the Cassini spacecraft in a wide range of solar phase angles. From the derived lightcurves, synodic rotation periods were determined, ranging from 5.5 h to 76 h; the fastest observed spin rate is much slower than the d…
The Gaia-ESO Survey: The inner disc, intermediate-age open cluster Pismis 18
Hatzidimitriou, D.; Gilmore, G.; Bayo, A. +34 more
Context. Pismis 18 is a moderately populated, intermediate-age open cluster located within the solar circle at a Galactocentric distance of about seven kpc. Few open clusters have been studied in detail in the inner disc region before the Gaia-ESO Survey.
Aims: New data from the Gaia-ESO Survey allowed us to conduct an extended radial velocit…
Properties of the Interstellar Medium along Sight Lines to Nearby Planet-hosting Stars
Redfield, Seth; Wood, Brian E.; Linsky, Jeffrey L. +2 more
We analyze the high-resolution ultraviolet spectra of three nearby exoplanet host stars (HD 192310, HD 9826, and HD 206860) to study interstellar properties along their lines of sight and to search for the presence of astrospheric absorption. Using the Hubble Space Telescope/Space Telescope Imaging Spectrograph spectra of the Lyα, Mg II, and Fe II…
Herschel-ATLAS : the spatial clustering of low- and high-redshift submillimetre galaxies
Andreani, P.; van Kampen, E.; Wang, L. +12 more
We present measurements of the angular correlation function of sub-millimetre (sub-mm) galaxies (SMGs) identified in four out of the five fields of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) - GAMA-9h, GAMA-12h, GAMA-15h, and NGP - with flux densities S_{250 µ m} > 30 mJy at 250 µm. We show that galaxies select…
Radio Occultation Observations of the Solar Corona Over 1.60-1.86 R⊙: Faraday Rotation and Frequency Shift Analysis
Lionello, Roberto; Hollweg, Joseph V.; Jensen, Elizabeth A. +5 more
The study of coronal energy transport, central to the solar wind acceleration problem, relies upon accurate representation of magnetic fields and plasma electron densities. This information is difficult to obtain in middle-to-lower coronal regions that may contain complex magnetic structures. Faraday rotation (FR) solar radio occultation observati…
Two new R CMa-type eclipsing binaries containing a possible low-mass Helium white dwarf precursor: KIC 7368103 and KIC 8823397
Zhang, Xiaobin; Luo, Yangping; Wang, Kun +1 more
We report the discovery of two new R CMa-type eclipsing binaries, each consisting of a possible low-mass Helium white dwarf precursor. Based on the Kepler long-cadence photometry and the radial-velocity measurements given by Matson et al., we determined comprehensive photometric solutions and physical parameters of two binaries KIC 7368103 and KIC…
Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC 7094
Rauch, T.; Werner, K.; Kruk, J. W. +5 more
Stellar post asymptotic giant branch (post-AGB) evolution can be completely altered by a final thermal pulse (FTP) which may occur when the star is still leaving the AGB (AFTP), at the departure from the AGB at still constant luminosity (late TP, LTP) or after the entry to the white-dwarf cooling sequence (very late TP, VLTP). Then convection mixe…