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The Gaia-ESO survey: a lithium depletion boundary age for NGC 2232
Gilmore, G.; Bayo, A.; Franciosini, E. +17 more
Astrometry and photometry from Gaia and spectroscopic data from the Gaia-ESO Survey (GES) are used to identify the lithium depletion boundary (LDB) in the young cluster NGC 2232. A specialized spectral line analysis procedure was used to recover the signature of undepleted lithium in very low luminosity cluster members. An age of 38 ± 3 Myr is inf…
Observational Signatures of Cosmic-Ray Interactions in Molecular Clouds
Wu, Kinwah; Lai, Shih-Ping; On, Alvina Y. L. +1 more
We investigate ionization and heating of gas in the dense, shielded clumps/cores of molecular clouds bathed by an influx of energetic, charged cosmic rays (CRs). These molecular clouds have complex structures, with substantial variation in their physical properties over a wide range of length scales. The propagation and distribution of CRs is thus…
BO Ceti: Dwarf nova showing both IW And-type and SU UMa-Type features
Monard, Berto; Tampo, Yusuke; Kato, Taichi +13 more
IW And stars are a recently recognized subgroup of dwarf novae which are characterized by (often repetitive) slowly rising standstills terminated by brightening, but the exact mechanism for this variation is not yet identified. We have identified BO Cet, which had been considered as a novalike cataclysmic variable, as a new member of IW And stars …
Non-LTE inversions of a confined X2.2 flare. I. The vector magnetic field in the photosphere and chromosphere
Leenaarts, J.; Pomoell, J.; Price, D. J. +7 more
Context. Obtaining an accurate measurement of magnetic field vector in the solar atmosphere is essential for studying changes in field topology during flares and reliably modelling space weather.
Aims: We tackle this problem by applying various inversion methods to a confined X2.2 flare that occurred in NOAA AR 12673 on 6 September 2017 and c…
Discovery of a new nearby globular cluster with extreme kinematics located in the extension of a halo stream
Smith, Leigh C.; Minniti, Dante; Fernández-Trincado, José G. +3 more
Context. We report the discovery of VVV-CL160, a new nearby globular cluster (GC) with extreme kinematics, located in the Galactic plane at l = 10.1477 deg, b = 0.2999 deg.
Aims: We aim to characterize the physical properties of this new GC and place it in the context of the Milky Way, exploring its possible connection with the known GC NGC 6…
Analysis of galaxy kinematics based on Cepheids from the Gaia DR2 Catalogue
Bobylev, V. V.; Bajkova, A. T.; Rastorguev, A. S. +1 more
To construct the rotation curve of the Galaxy, classical Cepheids with proper motions, parallaxes and line-of-sight velocities from the Gaia DR2 Catalogue are used in large part. Our working sample formed from literature data contains about 800 Cepheids with estimates of their age. We determined that the linear rotation velocity of the Galaxy at t…
MONOS: Multiplicity Of Northern O-type Spectroscopic systems. II. Orbit review and analysis for 35 single-lined spectroscopic binary systems and candidates
Simón-Díaz, S.; Maíz Apellániz, J.; Negueruela, I. +3 more
Context. Massive stars are a key element for understanding the chemical and dynamical evolution of galaxies. Stellar evolution is conditioned by many factors: Rotation, mass loss, and interaction with other objects are the most important ones for massive stars. During the first evolutionary stages of stars with initial masses (i.e., MZAMS
The Hubble PanCET Program: A Metal-rich Atmosphere for the Inflated Hot Jupiter HAT-P-41b
Deming, Drake; Madhusudhan, Nikku; Nikolov, Nikolay +14 more
We present a comprehensive analysis of the 0.3-5 µm transit spectrum for the inflated hot Jupiter HAT-P-41b. The planet was observed in transit with Hubble STIS and WFC3 as part of the Hubble Panchromatic Comparative Exoplanet Treasury (PanCET) program, and we combine those data with warm Spitzer transit observations. We extract transit dept…
Recurrent Activity from Active Asteroid (248370) 2005 QN173: A Main-belt Comet
Chandler, Colin Orion; Trujillo, Chadwick A.; Hsieh, Henry H.
We present archival observations of main-belt asteroid (248370) 2005 QN173 (also designated 433P) that demonstrate this recently discovered active asteroid (a body with a dynamically asteroidal orbit displaying a tail or coma) has had at least one additional apparition of activity near perihelion during a prior orbit. We discovered evid…
Revisiting Attenuation Curves: The Case of NGC 3351
Grebel, Eva K.; Östlin, Göran; Smith, Linda J. +14 more
Multiwavelength images from the far-UV (∼0.15 µm) to the submillimeter of the central region of the galaxy NGC 3351 are analyzed to constrain its stellar populations and dust attenuation. Despite hosting a ∼1 kpc circumnuclear starburst ring, NGC 3351 deviates from the IRX-β relation, the relation between the infrared-to-UV luminosity ratio …