Search Publications
Ellipsoidal primary of the RS CVn binary ζ Andromedae . Investigation using high-resolution spectroscopy and optical interferometry
Strassmeier, K. G.; Korhonen, H.; Wittkowski, M. +3 more
Aims: We have obtained high-resolution spectroscopy, optical interferometry, and long-term broad band photometry of the ellipsoidal primary of the RS CVn-type binary system ζ And. These observations are used to obtain fundamental stellar parameters and to study surface structures and their temporal evolution.
Methods: Temperature maps of…
Possible detection of phase changes from the non-transiting planet HD 46375b by CoRoT
Aigrain, S.; Auvergne, M.; Schneider, J. +19 more
Context. The present work deals with the detection of phase changes in an exoplanetary system. HD 46375 is a solar analog known to host a non-transiting Saturn-mass exoplanet with a 3.0236 day period. It was observed by the CoRoT satellite for 34 days during the fall of 2008.
Aims: We attempt to identify at optical wavelengths, the changing p…
Environmental dependence of 8 µm luminosity functions of galaxies at z ~ 0.8. Comparison between RXJ1716.4+6708 and the AKARI NEP-deep field
Im, M.; Lee, H. M.; Inami, H. +20 more
Aims: We aim to reveal environmental dependence of infrared luminosity functions (IR LFs) of galaxies at z ~ 0.8 using the AKARI satellite. AKARI's wide field of view and unique mid-IR filters help us to construct restframe 8 µm LFs directly without relying on SED models.
Methods: We construct restframe 8 µm IR LFs in the clu…
High-resolution visible spectroscopy of the jet-driving star Th 28
Comerón, F.; Fernández, M.
Context. We present a study of the extreme T Tauri star Th 28, a young stellar object in the Lupus 3 cloud whose spectrum displays all the varieties of signposts associated with early stellar activity. Th 28 is the driving source of a fast jet, making it a very promising target to study the disk-jet connection.
Aims: We try to identify and in…
High- and low-resolution spectroscopic observations of the peculiar planetary-nebula HD 149427 (=PC 11)
Pereira, C. B.; Miranda, L. F.; Daflon, S. +1 more
Aims: We discuss the status of the A-type component of the binary central star in the peculiar planetary nebula HD 149427.
Methods: We acquired low and high spectral resolution optical spectroscopy for the range 4500-9000 Å.
Results: The analysis of the high resolution spectrum shows that the A-type star has an effective temperature…
Formation and evolution of early-type galaxies: spectro-photometry from cosmo-chemo-dynamical simulations
Merlin, E.; Piovan, L.; Chiosi, C. +2 more
Context. One of the major challenges in modern astrophysics is to understand the origin and the evolution of galaxies, the bright, massive early type galaxies (ETGs) in particular. There is strong observational evidence that massive ETGs are already in place at redshift z ~ 2-3 and that they formed most of their stars well before z = 1. Therefore,…
Acoustic power absorption and enhancement generated by slow and fast MHD waves. Evidence of solar cycle velocity/intensity amplitude changes consistent with the mode conversion theory
García, R. A.; Finsterle, W.; Elsworth, Y. +4 more
We used long duration, high quality, unresolved (Sun-as-a star) observations collected by the ground based network BiSON and by the instruments GOLF and VIRGO on board the ESA/NASA SOHO satellite to search for solar-cycle-related changes in mode characteristics in velocity and continuum intensity for the frequency range between 2.5 mHz <ν< 6…
The AGN fraction of submm-selected galaxies and contributions to the submm/mm-wave extragalactic background light
Im, M.; Kim, S.; Farrah, D. +22 more
We present a comparison of the SCUBA half degree extragalactic survey (SHADES) at 450 µm, 850 µm and 1100 µm with deep guaranteed time 15 µm AKARI FU-HYU survey data and Spitzer guaranteed time data at 3.6-24 µm in the Lockman hole east. The AKARI data was analysed using bespoke software based in part on the drizzling…
Warm absorber and truncated accretion disc in IRAS 05078+1626
Guainazzi, M.; Karas, V.; Svoboda, J.
Context. X-ray observations of unabsorbed active galactic nuclei provide an opportunity to explore the innermost regions of supermassive black hole accretion discs.
Aims: Our goal in this paper is to investigate the central environment of a Seyfert 1.5 galaxy IRAS 05078+1626.
Methods: We studied the time-averaged spectrum obtained with t…
Disc and halo kinematic populations from HIPPARCOS and Geneva-Copenhagen surveys of the solar neighbourhood
Cubarsi, R.; Alcobé, S.; Vidojević, S. +1 more
Discontinuities in the local velocity distribution associated with stellar populations are studied using the Maximum Entropy of the Mixture Probability from HIerarchical Segregation (MEMPHIS) improved statistical method, by combining a sampling parameter, an optimisation of the mixture approach, and a maximisation of the partition entropy for the …