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Stellar rotation, binarity, and lithium in the open cluster IC 4756
Strassmeier, K. G.; Weber, M.; Granzer, T. +3 more
Context. An important aspect in the evolutionary scenario of cool stars is their rotation and the rotationally induced magnetic activity and interior mixing. Stars in open clusters are particularly useful tracers for these aspects because of their known ages.
Aims: We aim to characterize the open cluster IC 4756 and measure stellar rotation p…
Surface brightness profiles of blue compact dwarf galaxies in the GOODS-N and GOODS-S field
Kong, X.; Lian, J. H.; Jiang, N. +2 more
We investigate the structural properties of the underlying hosts of 34 blue compact dwarf (BCD) galaxies with deep near-infrared (NIR) photometry. The BCD sample is selected from the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey in the Great observatories origins Deep Survey North and South fields. We extract the surface brightness prof…
Previously hidden low-energy ions: a better map of near-Earth space and the terrestrial mass balance
André, Mats
This is a review of the mass balance of planet Earth, intended also for scientists not usually working with space physics or geophysics. The discussion includes both outflow of ions and neutrals from the ionosphere and upper atmosphere, and the inflow of meteoroids and larger objects. The focus is on ions with energies less than tens of eV origina…
Constraining hybrid natural inflation with recent CMB data
Hidalgo, Juan Carlos; Vázquez, J. Alberto; Carrillo-González, Mariana +2 more
We study the Hybrid Natural Inflation (HNI) model and some of its realisations in the light of recent CMB observations, mainly Planck temperature and WMAP-9 polarization, and compare with the recent release of BICEP2 dataset. The inflationary sector of HNI is essentially given by the potential V(ϕ) = V0(1+acos(ϕ/f)), where a is a positi…
“Dust, Ice, and Gas In Time” (DIGIT) Herschel Observations of GSS30-IRS1 in Ophiuchus
Lee, Jeong-Eun; Green, Joel D.; Je, Hyerin +2 more
As a part of the “Dust, Ice, and Gas In Time” (DIGIT) key program on Herschel, we observed GSS30-IRS1, a Class I protostar located in Ophiuchus (d = 120 pc), with Herschel/Photodetector Array Camera and Spectrometer. More than 70 lines were detected within a wavelength range from 50 to 200 µ m, including CO, H2O, OH, and two atomi…
Non-local scalar fields inflationary mechanism in light of Planck 2013
Sheikhahmadi, Haidar; Ghorbani, Soheyla; Saaidi, Khaled
A generalization of the canonical and non-canonical theory of inflation is introduced in which the kinetic energy term in action is written as non-local term. The inflationary universe within the framework of considering this non-locality will be studied. To investigate the effects of non-locality on the inflationary parameters we consider two wel…
Constraints on the Surface Magnetic Fields and Age of a Cool Hypergiant: XMM-Newton X-Ray Observations of VY CMa
Humphreys, Roberta M.; Davidson, Kris; Kastner, Joel H. +2 more
The complex circumstellar ejecta of highly evolved, cool hypergiants are indicative of multiple, asymmetric mass-loss events. To explore whether such episodic, non-isotropic mass loss may be driven by surface magnetic activity, we have observed the archetypical cool hypergiant VY CMa with the XMM-Newton X-ray satellite observatory. The hypergiant …
Detection of small-scale folds at a solar wind reconnection exhaust
Eastwood, J. P.; Hietala, H.; Mistry, R.
of reconnection in the solar wind over the last few years appear to indicate that the majority of large-scale reconnecting current sheets are roughly planar, and that reconnection itself is quasi-steady. Most studies of solar wind exhausts have used spacecraft with large separations and relatively low time cadence ion measurements. Here we present…
Coronal Radio Occultation Experiments with the Helios Solar Probes: Correlation/Spectral Analysis of Faraday Rotation Fluctuations
Pätzold, M.; Bird, M. K.; Efimov, A. I. +4 more
The coronal Faraday rotation (FR) experiments using the linearly polarized signals of the Helios-1 and Helios-2 interplanetary probes remain a unique investigation of the magnetic field of the solar corona and its aperiodic and quasi-periodic variations. The unexpectedly long lifetime of these spacecraft (1974 - 1986) enabled studies from very dee…
Auroral spirals at Saturn
Roussos, E.; Bonfond, B.; Gérard, J. -C. +4 more
We report observations of auroral spirals at Saturn propagating from midnight to noon via dawn, based on Cassini/UVIS measurements. The aurora during that sequence is observed for the first time to consist of detached features swirling as they propagate from dawn to early afternoon. The features have a diameter of ∼6000 km in the ionosphere, which…