Search Publications
Mass loss via solar wind and coronal mass ejections during solar cycles 23 and 24
Wang, Yuming; Liu, Rui; Srivastava, Nandita +3 more
Similar to the Sun, other stars shed mass and magnetic flux via ubiquitous quasi-steady wind and episodic stellar coronal mass ejections (CMEs). We investigate the mass loss rate via solar wind and CMEs as a function of solar magnetic variability represented in terms of sunspot number and solar X-ray background luminosity. We estimate the contribu…
Early science with the Large Millimetre Telescope: An LMT/AzTEC 1.1 mm Survey of dense cores in the Monoceros R2 giant molecular cloud
Wilson, G. W.; Schloerb, F. P.; Luna, A. +7 more
We present a 1.1 mm census of dense cores in the Mon R2 giant molecular cloud with the AzTEC instrument on the Large Millimetre Telescope. We detect 295 cores (209 starless and 86 with protostars) in a two square degree shallow survey. We also carry out a deep follow-up survey of nine regions with low to intermediate (3 < AV < 7) …
Extraction of globular clusters members with Gaia DR2 astrometry
Bustos Fierro, Iván H.; Calderón, J. H.
In this work, we present a method to identify possible members of globular clusters using data from Gaia DR2. The method consists of two stages: the first one based on a clustering algorithm, and the second one based on the analysis of the projected spatial distribution of stars with different proper motions. In order to confirm that the clusters …
The core of the massive cluster merger MACS J0417.5-1154 as seen by VLT/MUSE
Mahler, Guillaume; Richard, Johan; Massey, Richard +11 more
We present a multiwavelength analysis of the core of the massive galaxy cluster MACS J0417.5-1154 (z = 0.441). Our analysis takes advantage of Very Large Telescope/Multi-Unit Spectroscopic Explorer observations which allow the spectroscopic confirmation of three strongly lensed systems. System #1, nicknamed The Doughnut, consists of three images o…
On migration of dust and ice grains on the surface of the rotating comet nucleus
Wesołowski, M.; Gronkowski, P.; Tralle, I.
In the paper the migration of dust and ice grains over the surface of the comet nucleus is considered and analysed. This phenomenon is a consequence of interplay between the components of three forces tangential to the surface of comet nucleus and acting on the comet's grain. These forces are the gravity of the comet's nucleus, the frictional forc…
K2 observations of the sdBV + dM/bd binaries PHL 457 and EQ Psc
Reed, M. D.; Jeffery, C. S.; Baran, A. S. +5 more
We present an analysis of two pulsating subdwarf B stars PHL 457 and EQ Psc observed during the K2 mission. The K2 light curves of both stars show variation consistent with irradiation of a cooler companion by the hot subdwarf. They also show higher frequency oscillations consistent with pulsation. Using new spectroscopic data, we measured the rad…
Signs of accretion in the white dwarf + brown dwarf binary NLTT5306
Maxted, P. F. L.; Page, K. L.; Wynn, G. A. +4 more
We present new XSHOOTER spectra of NLTT5306, a 0.44 ± 0.04 M⊙ white dwarf in a short period (101 min) binary system with a brown dwarf companion that is likely to have previously undergone common envelope evolution. We have confirmed the presence of H α emission and discovered Na I absorption associated with the white dwarf. These obser…
The integrated properties of the CALIFA galaxies: model-derived galaxy parameters and quenching of star formation
Zezas, A.; Ciesla, L.; Charmandaris, V. +6 more
We present a study of the integrated properties of the 835 galaxies in the Calar-Alto Legacy Integral Field spectroscopy Area survey. To derive the main physical parameters of the galaxies we have fitted their UV-to-IR spectral energy distributions (SEDs) with sets of theoretical models using CIGALE. We perform a comparison of the integrated galax…
Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology
Huber, Daniel; Bedding, Timothy R.; Howard, Andrew W. +6 more
We perform a search for rapidly oscillating Ap stars in the Kepler long-cadence data, where true oscillations above the Nyquist limit of 283.21 µHz can be reliably distinguished from aliases as a consequence of the barycentric time corrections applied to the Kepler data. We find evidence for rapid oscillations in six stars: KIC 6631188, KIC …
The fifth main-sequence magnetic B-type star showing coherent radio emission: Is this really a rare phenomenon?
Wade, Gregg A.; Chandra, Poonam; Das, Barnali +1 more
We report the discovery of intense, highly directional radio emission from the Bp star HD 35298, which we interpret as the consequence of Electron Cyclotron Maser Emission (ECME). The star was observed with the Giant Metrewave Radio Telescope near the rotational phases of both magnetic nulls in band 4 (550-750 MHz) and one of the nulls in band 5 (…