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Proper-motion Membership Tests for Four Planetary Nebulae in Galactic Globular Clusters
Bond, Howard E.; Sahu, Kailash C.; Bellini, Andrea
Four planetary nebulae (PNe) are considered to be probable or possible members of Galactic globular clusters (GCs). These are Ps 1 = K648 in M15, GJJC 1 = IRAS 18333-2357 in M22, JaFu 1 in Palomar 6, and JaFu 2 in NGC 6441. In addition to lying close to the host GCs on the sky, these PNe have radial velocities that are consistent, within the error…
Temporal evolution of the permanent shadowed regions at Mercury poles: applications for spectral detection of ices by SIMBIOSYS-VIHI on BepiColombo mission
Massironi, Matteo; Lucchetti, Alice; Cremonese, Gabriele +9 more
Radar observations from the Earth and multi-instrument measurements by MESSENGER mission have indicated the presence of large quantities of ices within the permanent shadowed regions (PSRs) located at Mercury poles. The detection and mapping of the distribution of volatile species on PSRs are among the primary scientific goals of the Spectrometer …
The Galactic LMXB Population and the Galactic Centre Region
Krivonos, R.; Sazonov, S.; Wilms, J. +21 more
Seventeen years of hard X-ray observations with the instruments of the INTEGRAL observatory, with a focus on the Milky Way and in particular on the Galactic Centre region, have provided a unique database for exploration of the Galactic population of low-mass X-ray binaries (LMXBs). Our understanding of the diverse energetic phenomena associated wi…
Ice Permafrost ``Oases'' Close to Martian Equator: Planet Neutron Mapping Based on Data of FREND Instrument Onboard TGO Orbiter of Russian-European ExoMars Mission
Mitrofanov, I. G.; Golovin, D. V.; Litvak, M. L. +8 more
We present the first results of Mars neutron sounding by FREND instrument onboard ESA's Trace Gas Orbiter data analysis. Neutron flux mapping is performed with high spatial resolution, which allows to match epithermal neutron flux variation with relief's geomorphological structures. Local regions with suppressed neutron flux indicate the presence …
Measurements of the Ca II infrared triplet emission lines of pre-main-sequence stars
Itoh, Yoichi; Takagi, Yuhei; Yamashita, Mai
We investigated the chromospheric activity of 60 pre-main-sequence (PMS) stars in four molecular clouds and five moving groups. It is considered that strong chromospheric activity is driven by the dynamo processes generated by stellar rotation. In contrast, several researchers have pointed out that the chromospheres of PMS stars are activated by m…
Time-sequence Spectroscopy of Epsilon CrA: The 518 nm Mg I Triplet Region Analyzed with Broadening Functions
Rucinski, Slavek M.
High-resolution spectroscopic observations of the W UMa-type binary ɛ CrA obtained as a time-monitoring sequence on four full and four partial nights within two weeks have been used to derive orbital elements of the system and discuss the validity of the Lucy model for description of the radial-velocity data. The observations had more extensive te…
The star formation properties of the observed and simulated AGN Universe: BAT versus EAGLE
Alexander, D. M.; Bower, R. G.; Rosario, D. J. +3 more
In this paper, we present data from 72 low-redshift, hard X-ray selected active galactic nucleus (AGN) taken from the Swift-BAT 58 month catalogue. We utilize spectral energy distribution fitting to the optical to infrared photometry in order to estimate host galaxy properties. We compare this observational sample to a volume- and flux-matched sam…
VIBES: Visual Binary Exoplanet survey with SPHERE. Upper limits on wide S-planet and S-BD frequencies, triple system discovery, and astrometric confirmation of 20 stellar binaries and three triple systems
Quanz, S. P.; Meyer, M.; Jayawardhana, R. +7 more
Context. Recent surveys indicate that planets in binary systems are more abundant than previously thought, which is in agreement with theoretical work on disc dynamics and planet formation in binaries. So far, most observational surveys, however, have focused on short-period planets in binaries, thus little is known about the occurrence rates of p…
Crepuscular Rays from the Highly Inclined Active Galactic Nucleus in IC 5063
Ho, Luis C.; Elvis, Martin; Barth, Aaron J. +10 more
On Earth near sunset, the Sun may cast "crepuscular rays" such that clouds near the horizon obscure the origin of light scattered in bright rays. In principle, active galactic nuclei (AGN) should be able to produce similar effects. Using new Hubble Space Telescope (HST) near-infrared and optical observations, we show that the active galaxy IC 5063…
A qualitative classification of extraterrestrial civilizations
Minniti, Dante; Ivanov, Valentin D.; Cáceres, Claudio +1 more
Context. Interest in searches for extraterrestrial civilizations (ETCs) has been boosted in recent decades by the discovery of thousands of exoplanets.
Aims: We turn to the classification of ETCs for new considerations that may help to design better strategies for searching for ETCs.
Methods: This study is based on analogies with our own…