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On the triple-star origin of the planetary nebula Sh 2-71
Corradi, Romano L. M.; Jones, David; Pejcha, Ondřej
Recent studies have indicated that triple-star systems may play a role in the formation of an appreciable number of planetary nebulae, however, only one triple central star is known to date (and that system is likely too wide to have had much influence on the evolution of its component stars). Here, we consider the possibility that Sh 2-71 was for…
Late-time Observations of the Type Ia Supernova SN 2014J with the Hubble Space Telescope Wide Field Camera 3
Graur, Or
Recent works have studied the late-time light curves of Type Ia supernovae (SNe Ia) when these were older than 500 days past B-band maximum light. Of these, SN 2014J, which exploded in the nearby galaxy M82, was studied with the Advanced Camera for Surveys onboard the Hubble Space Telescope (HST) by Yang et al. Here, I report complementary photome…
ALMA observations of the "fresh" carbon-rich AGB star TX Piscium. The discovery of an elliptical detached shell
Olofsson, H.; Mecina, M.; Kerschbaum, F. +4 more
Aims: The carbon-rich asymptotic giant branch (AGB) star TX Piscium (TX Psc) has been observed multiple times during multiple epochs and at different wavelengths and resolutions, showing a complex molecular CO line profile and a ring-like structure in thermal dust emission. We investigate the molecular counterpart in high resolution, aiming t…
First detection of oscillations in the Halo giant HD 122563: Validation of seismic scaling relations and new parameters
Andersen, M. F.; Grundahl, F.; Pallé, P. L. +8 more
Aims: The nearby metal-poor giant HD 122563 is an important astrophysical laboratory in which to test stellar atmospheric and interior physics. It is also a benchmark star for which to calibrate methods to apply to large scale surveys. Recently it has been remeasured using various methodologies given the new high precision instruments at our …
The Close AGN Reference Survey (CARS). Discovery of a global [C II] 158 µm line excess in AGN HE 1353-1917
Gaspari, M.; Groves, B.; Combes, F. +15 more
The [C II]λ158 µm line is one of the strongest far-infrared (FIR) lines and an important coolant in the interstellar medium of galaxies that is accessible out to high redshifts. The excitation of [C II] is complex and can best be studied in detail at low redshifts. Here we report the discovery of the highest global [C II] excess with respect…
Discovery of a second pulsating intermediate helium-enriched sdOB star
Latour, M.; Green, E. M.; Fontaine, G.
We present the discovery of long-period, low-amplitude, g-mode pulsations in the intermediate He-rich hot subdwarf (sdOB) star Feige 46. So far, only one other He-enriched sdOB star (LS IV-14 ° 116) was known to exhibit such pulsations. From our ground-based light curves of Feige 46, we extracted five independent periodicities ranging from 2294 s …
Masses of the Hyades white dwarfs. A gravitational redshift measurement
Pasquini, L.; Pala, A. F.; Ludwig, H. -G. +3 more
Context. It is possible to accurately measure the masses of the white dwarfs (WDs) in the Hyades cluster using gravitational redshift, because the radial velocity of the stars can be obtained independently of spectroscopy from astrometry and the cluster has a low velocity dispersion.
Aims: We aim to obtain an accurate measurement of the Hyade…
Decade‑long X‑ray observations of HESS J0632+057
Santangelo, Andrea; Pühlhofer, Gerd; Chernyakova, Maria +1 more
We present the results of a decade of X‑ray observations of the gamma ray loud binary HESS J0632+057 and interpret the available broadband data in view of the system geometry and emission mechanisms. We have performed an analysis of all X‑ray data available to date from Swift, XMM‑Newton, Chandra, NuSTAR, and Suzaku. We refine the orbital period o…
A Dynamical Study of Extraplanar Diffuse Ionized Gas in NGC 5775
Gallagher, J. S., III; Boettcher, Erin; Zweibel, Ellen G.
The structure and kinematics of gaseous, disk-halo interfaces are imprinted with the processes that transfer mass, metals, and energy between galactic disks and their environments. We study the extraplanar diffuse ionized gas (eDIG) layer in the interacting, star-forming galaxy NGC 5775 to better understand the consequences of star formation feedb…
First Observations of the Disruption of the Earth's Foreshock Wave Field During Magnetic Clouds
Escoubet, C. P.; Dandouras, I.; Palmroth, M. +8 more
The foreshock, extending upstream of Earth's bow shock, is a region of intense electromagnetic wave activity and nonlinear phenomena, which can have global effects on geospace. It is also the first geophysical region encountered by solar wind disturbances journeying toward Earth. Here, we present the first observations of considerable modification…