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Constraints on HD 113337 fundamental parameters and planetary system. Combining long-base visible interferometry, disc imaging, and high-contrast imaging
Henning, T.; Meunier, N.; Lagrange, A. -M. +14 more
Context. HD 113337 is a main-sequence F6V field star more massive than the Sun. This star hosts one confirmed giant planet and possibly a second candidate, detected by radial velocities (RVs). The star also hosts a cold debris disc detected through the presence of an infrared excess, making it an interesting system to explore.
Aims: We aim to…
Synthetic Emissions of the Fe XXI 1354 Å Line from Flare Loops Experiencing Fundamental Fast Sausage Oscillations
Li, Bo; Huang, Zhenghua; Shi, Mijie +1 more
Inspired by recent IRIS observations, we forward model the response of the Fe XXI 1354 Å line to fundamental, standing, linear fast sausage modes (FSMs) in flare loops. Starting with the fluid parameters for an FSM in a straight tube with equilibrium parameters largely compatible with the IRIS measurements, we synthesize the line profiles by incor…
The origin of very massive stars around NGC 3603
Vink, J. S.; de Wit, W. J.; Méndez, R. A. +2 more
The formation mechanism of the most massive stars in the Universe remains an unsolved problem. Are they able to form in relative isolation in a manner similar to the formation of solar-type stars, or do they necessarily require a clustered environment? In order to shed light on this important question, we study the origin of two very massive stars…
Flares of accretion activity of the 20 Myr old UXOR RZ Psc
Grinin, V. P.; Potravnov, I. S.; Serebriakova, N. A.
We discuss a revision of accretion activity and kinematics of the enigmatic isolated UX Ori type star RZ Psc. Previously, RZ Psc was known to possess only spectroscopic signatures of outflow in the low-excitation lines of alkali metals. The archival high-resolution spectra reveal a short-lived episode of magnetospheric accretion in the system obse…
Discovery of δ Scuti Pulsations in the Young Hybrid Debris Disk Star HD 156623
Ireland, Michael J.; Bailey, John I., III; Kenworthy, Matthew A. +11 more
The bRing robotic observatory network was built to search for circumplanetary material within the transiting Hill sphere of the exoplanet β Pic b across its bright host star β Pic. During the bRing survey of β Pic, it simultaneously monitored the brightnesses of thousands of bright stars in the southern sky (V ≃ 4-8, δ ≲ -30°). In this work, we an…
New hot subdwarf variables from the EC survey
Kilkenny, D.; Lynas-Gray, A. E.; Worters, H. L.
We present new results for hot subdwarf stars from the Edinburgh-Cape (EC) blue object survey. EC 03089-6421, an sdO star recently discovered to be a very rapid pulsator with periods near 31.1 and 34.2 s (29.2 and 32.1 mHz), is shown to have an even faster pulsation near 26.6 s (37.6 mHz) although all pulsations are variable in amplitude and effec…
The radial distribution of blue stragglers in Galactic globular cluster NGC 6656 - clues to the dynamical status
Yadav, R. K. S.; Singh, Gaurav
We present the dynamical status of the Galactic globular cluster NGC 6656 using the spatial distribution of blue straggler stars (BSSs). A combination of multi-wavelength high-resolution space- and ground-based data are used to cover a large cluster region. We determine the centre of gravity (Cgrav) and construct the projected density p…
Star formation and polycyclic aromatic hydrocarbons in ELAIS N1 galaxies as seen by AKARI
Burgarella, Denis; Oyabu, Shinki; Kaneda, Hidehiro +4 more
We have examined the relationship between star formation and polycyclic aromatic hydrocarbons (PAHs) in a variety of galaxies. PAHs are excited by the ultraviolet photons of young stars, but they are disassociated by strong UV radiation in starbursts. Therefore their emission (which is in the wavelength range covered by AKARI) can be used as a sta…
The Formation of CME from Coupling Fan-spine Magnetic System: A Difficult Journey
Yang, Jiayan; Hong, Junchao; Chen, Hechao +1 more
We present the eruption of a mini-filament that caused a large-scale complicated coronal mass ejection (CME) on 2014 March 28, using the high-resolution observations taken by the Solar Dynamic Observatory. Three-dimensional coronal magnetic field extrapolated from the nonlinear force-free field code reveals that the magnetic environment of the eru…
Solar-Related Variations of the Cloud Top Circulation Above Aphrodite Terra From VMC/Venus Express Wind Fields
Bertaux, J. -L.; Zasova, L. V.; Titov, D. V. +3 more
Winds derived by a digital tracking technique from ultraviolet (365 nm) images captured by the Venus Monitoring Camera (VMC) onboard the Venus Express spacecraft from 2006 to 2013 were used to study the atmospheric circulation at cloud top level (70 ± 2 km). This data set allows variations of the wind speed with both latitude and longitude to be s…