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Forgotten treasures in the HST/FOC UV imaging polarimetric archives of active galactic nuclei: III. Five years monitoring of M87
Lopez-Rodriguez, E.; Marin, F.; Wu, K. +1 more
Context. The active galactic nucleus within M87, a giant elliptical galaxy, is responsible for one of the closest kiloparsec-scale relativistic jets to Earth. It is thus a perfect target for spatially resolved observations. Aims. This one-sided jet has been extensively observed at almost all wavelengths, with almost all techniques. Among many othe…
SMC-Last Extracted Photometry
Boyer, M. L.; Oliveira, Joana M.; van Loon, Jacco Th. +11 more
We present point-source photometry from the Spitzer Space Telescope's final survey of the Small Magellanic Cloud (SMC). We mapped nearly 30 deg2 in two epochs in 2017, with the second extending to early 2018 at 3.6 and 4.5 µm using the Infrared Array Camera. This survey duplicates the footprint from the SAGE-SMC program in 2008. T…
Determining stellar properties of massive stars in NGC346 in the SMC with a Bayesian statistic technique
Hamann, W. -R.; Prinja, R. K.; Oskinova, L. M. +8 more
Context. NGC 346 is a young cluster with numerous hot OB stars. It is part of the Small Magellanic Cloud (SMC), and has an average metallicity that is one-seventh of the Milky Way's. A detailed study of its stellar content provides a unique opportunity to understand the stellar and wind properties of massive stars in low-metallicity environments, …
Spatially resolving the AGB star V3 in the metal-poor globular cluster 47 Tuc with VLTI/GRAVITY
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +1 more
Context. Mass loss at the asymptotic giant branch (AGB) plays an important role not only in the final fates of stars, but also in the chemical evolution of galaxies. Nevertheless, the metallicity effects on AGB mass loss are not yet fully understood.
Aims: We present spatially resolved observations of an AGB star, V3, in the metal-poor globul…
THEMIS observations of compressional Pc5 pulsations in the dawn- and duskside magnetosphere
Sibeck, D. G.; Korotova, G. I.
We present case and statistical studies of compressional Pc5 pulsations observed by the THEMIS spacecraft in the dawn- and duskside magnetosphere from 2007 to 2011. A case study provides evidence for compressional Pc5 pulsations in the dawnside magnetosphere following the arrival of particles injected by a substorm and the subsequent growth of the…
Mitigating astrometric bias in barycentric correction with PEXO
Feng, Fabo; Rui, Yicheng
Extremely precise radial velocity is essential for the detection of sub-m s-1 radial velocity of stars induced by Earth-like planets. Although modelling of the barycentric correction of radial velocity could achieve 1 mm s-1 precision, the input astrometry could be biased due to non-linear motions of stars caused by companion…
Revisiting the warm sub-Saturn TOI-1710b. The impact of stellar activity on the mass measurement
Pallé, E.; Nowak, G.; Winn, J. N. +37 more
The Transiting Exoplanet Survey Satellite (TESS) provides a continuous suite of new planet candidates that need confirmation and precise mass determination from ground-based observatories. This is the case for the G-type star TOI-1710, which is known to host a transiting sub-Saturn planet (Mp = 28.3 ± 4.7 M⊕) in a long-period…
X-raying the wind-wind collisions in HD 168112 and HD 167971
Blomme, R.; Nazé, Y.; Rauw, G. +1 more
The O-type long-period binary HD 168112 and triple HD 167971 star systems have been known for several decades for their non-thermal synchrotron radio emission. This emission arises from relativistic electrons accelerated in the hydrodynamic shocks of the wind collisions in these systems. Such wind collisions are expected to produce a strong X-ray …
Seasonal variation in atmospheric optical depth (AOD) and thermal inertia (TI) inter-relationship over Martian Gale crater
Shaheen, Farzana; Krishna, A. P.; Nee Lala, Mili Ghosh +1 more
Investigating the relationship between thermal inertia (TI) and aerosol optical depth (AOD) is significant in giving insights into the seasonality of dust deposition and lifting phenomenon. The present study focuses on establishing a relationship of AOD with TI and different particle sizes over different Martian seasons. Two different Martian land…
Abundances of iron-peak elements in 58 bulge spheroid stars from APOGEE
Schultheis, M.; Minniti, D.; Valentini, M. +22 more
Context. Stars presently identified in the bulge spheroid are probably very old, and their abundances can be interpreted as due to the fast chemical enrichment of the early Galactic bulge. The abundances of the iron-peak elements are important tracers of nucleosynthesis processes, in particular oxygen burning, silicon burning, the weak s-process, …