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The Three-body System δ Circini
Mayer, Pavel; Harmanec, Petr; Sana, Hugues +1 more
Delta Cir is known as an O7.5 III eclipsing and spectroscopic binary with an eccentric orbit. Penny et al. discovered the presence of a third component in the IUE spectra. The eclipsing binary and the third body revolve around a common center of gravity with a period of 1644 days in an eccentric orbit with a semimajor axis of 10 AU. We demonstrate…
Superimposed oscillations in brane inflation
Martin, Jérôme; Ávila, Santiago; Steer, Danièle A.
In canonical scalar field inflation, the Starobinsky model (with a linear potential but discontinuous slope) is remarkable in that though slow-roll is violated, both the power-spectrum and bi-spectrum can be calculated exactly analytically. The two-point function is characterised by different power on large and small scales, and a burst of small a…
Predictions for the detection of Earth and Mars Trojan asteroids by the Gaia satellite
Tanga, P.; Coward, D. M.; Todd, M. +1 more
The European Space Agency Gaia satellite, planned for launch in late 2013, will perform systematic astrometric observations of the whole sky over a five year period. During this mission, many thousands of Solar System objects down to magnitude V = 20 will be observed including near-Earth asteroids and objects at solar elongations as low as 45°, wh…
Measuring Metallicities with Hubble Space Telescope/Wide-Field Camera 3 Photometry
Bond, Howard E.; Anthony-Twarog, Barbara J.; Holtzman, Jon A. +4 more
We quantified and calibrated the metallicity and temperature sensitivities of colors derived from nine Wide-Field Camera 3 filters on board the Hubble Space Telescope using Dartmouth isochrones and Kurucz atmosphere models. The theoretical isochrone colors were tested and calibrated against observations of five well studied galactic clusters, M92,…
Hubble Space Telescope and Spitzer point-source detection and optical extinction in powerful narrow-line radio galaxies
Tadhunter, C. N.; Rose, M.; Ramírez, E. A. +4 more
We present an analysis of infrared Hubble Space Telescope (HST) and Spitzer data for a sample of 13 Fanaroff-Riley II (FRII) radio galaxies at 0.03 < z < 0.11 that are classified as narrow-line radio galaxies (NLRGs). In the context of unified schemes for active galactic nuclei (AGNs), our direct view of AGNs in NLRGs is impeded by a parsec-…
PLANCK and WMAP constraints on generalised Hubble flow inflationary trajectories
Contaldi, Carlo R.; Horner, Jonathan S.
We use the Hamilton-Jacobi formalism to constrain the space of possible single field, inflationary Hubble flow trajectories when compared to the WMAP and PLANK satellites Cosmic Microwave Background (CMB) results. This method yields posteriors on the space of Hubble Slow Roll (HSR) parameters that uniquely determine the history of the Hubble param…
DN Tauri - coronal activity and accretion in a young low-mass CTTS
Schmitt, J. H. M. M.; Güdel, M.; Robrade, J. +1 more
Context. Classical T Tauri stars (CTTSs) are young, accreting low-mass stars; their X-ray emission differs from that of their main-sequence counterparts in a number of aspects.
Aims: We study the specific case of DN Tau, a young M0-type accreting CTTS, to extend the range of young CTTSs studied with high-resolution X-ray spectroscopy at lower…
Compositional diversity of near-, far-side transitory zone around Naonobu, Webb and Sinus Successus craters: Inferences from Chandrayaan-1 Moon Mineralogy Mapper (M3) data
Bharti, Rishikesh; Ramakrishnan, D.; Singh, K. D.
This study investigated the potential of Moon Mineralogy Mapper (M3) data for studying compositional variation in the near-, far-side transition zone of the lunar surface. For this purpose, the radiance values of the M3 data were corrected for illumination and emission related effects and converted to apparent reflectance. Di…
Broadband spectrum of the total X-ray emission from the galaxy M31
Sunyaev, R. A.; Tsygankov, S. S.; Revnivtsev, M. G. +2 more
We present the results of measurements of the total X-ray flux from the Andromeda galaxy (M31) in the 3-100 keV band based on data from the RXTE/PCA, INTEGRAL/ISGRI, and SWIFT/BAT space experiments. We show that the total emission from the galaxy has a multicomponent spectrum whose main characteristics are specified by binaries emitting in the opt…
Temperature Anisotropy in the Presence of Ultra Low Frequency Waves in the Terrestrial Foreshock
Eastwood, J. P.; Burgess, D.; Nakariakov, V. M. +3 more
We report the first study of the correlation between elevated solar wind core plasma temperatures and temperature anisotropy in the terrestrial foreshock. Plasma temperature is enhanced near the fire hose marginal stability threshold in the presence of ultra low frequency (ULF) large amplitude magnetic perturbations, which are intrinsically right-…