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Four stellar populations and extreme helium variation in the massive outer-halo globular cluster NGC 2419
Milone, A. P.; Cordoni, G.; Marino, A. F. +3 more
Recent work revealed that both the helium variation within globular clusters (GCs) and the relative numbers of first- and second-generation stars (1G, 2G) depend on the mass of the host cluster. Precise determination of the internal helium variations and of the fraction of 1G stars are crucial constraints to the formation scenarios of multiple pop…
Galactic tide and local stellar perturbations on the Oort cloud: creation of interstellar comets
Brown, A. G. A.; Torres, S.; Portegies Zwart, S. +1 more
Comets in the Oort cloud evolve under the influence of internal and external perturbations, such as giant planets, stellar passages, and the Galactic gravitational tidal field. We aim to study the dynamical evolution of the comets in the Oort cloud, accounting for the perturbation of the Galactic tidal field and passing stars. We base our study on…
OMEGA-OSIRIS mapping of emission-line galaxies in A901/2-V. The rich population of jellyfish galaxies in the multicluster system Abell 901/2
Chies-Santos, Ana L.; Aragón-Salamanca, A.; Bamford, Steven P. +3 more
We present the results of a systematic search and characterization of galaxies with morphological signatures of ram pressure stripping, known as jellyfish galaxies, in the multicluster system A901/2, at z ∼ 0.165, as part of the OMEGA survey. By visually inspecting Advanced Camera for Surveys/Hubble Space Telescope F606W images looking for morphol…
Investigating the diversity of Type Ia supernova spectra with the open-source relational data base KAEPORA
Foley, R. J.; Jones, D. O.; Siebert, M. R. +10 more
We present a public, open-source relational data base (we name KAEPORA) containing a sample of 4975 spectra of 777 Type Ia supernovae (SNe Ia). Since we draw from many sources, we significantly improve the spectra by inspecting these data for quality, removing galactic emission lines and cosmic rays, generating variance spectra, and correcting for…
The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-rich Stars in the Solar Neighborhood
Baranec, Christoph; Law, Nicholas M.; Riddle, Reed +8 more
Young stars in the solar neighborhood serve as nearby probes of stellar evolution and represent promising targets to directly image self-luminous giant planets. We have carried out an all-sky search for late-type (≈K7-M5) stars within 100 pc selected primarily on the basis of activity indicators from the Galaxy Evolution Explorer and ROSAT. Approx…
Three new Galactic star clusters discovered in the field of the open cluster NGC 5999 with Gaia DR2
Corradi, W. J. B.; Ferreira, Filipe A.; Santos, J. F. C. +2 more
We report the serendipitous discovery of three new open clusters, named UFMG 1, UFMG 2, and UFMG 3 in the field of the intermediate-age cluster NGC 5999, by using Gaia DR2 data. A colour-magnitude filter tailored for a proper selection of main-sequence stars and red clump giants turned evident the presence of NGC 5999 and these three new stellar g…
Molecular complexity on disc scales uncovered by ALMA. Chemical composition of the high-mass protostar AFGL 4176
van Dishoeck, Ewine F.; Hogerheijde, Michiel R.; Ligterink, Niels F. W. +4 more
Context. The chemical composition of high-mass protostars reflects the physical evolution associated with different stages of star formation. In addition, the spatial distribution and velocity structure of different molecular species provide valuable information on the physical structure of these embedded objects. Despite an increasing number of i…
The white dwarf mass-radius relation and its dependence on the hydrogen envelope
Kepler, S. O.; Romero, Alejandra D.; Joyce, S. R. G. +2 more
We present a study of the dependence of the mass-radius relation for DA white dwarf stars on the hydrogen envelope mass and the impact on the value of log g, and thus the determination of the stellar mass. We employ a set of full evolutionary carbon-oxygen core white dwarf sequences with white dwarf mass between 0.493 and 1.05 M⊙. Compu…
Infrared Contributions of X-Ray Selected Active Galactic Nuclei in Dusty Star-forming Galaxies
Azadi, Mojegan; Cooray, Asantha; Ma, Jingzhe +3 more
We investigate the infrared (IR) contribution from supermassive black hole activity versus host galaxy emission in the mid- to far-IR spectrum for a large sample of X-ray bright active galactic nuclei (AGN) residing in dusty, star-forming host galaxies. We select 703 AGN with {L}{{X}}={10}42{--}{10}46 erg s-1<…
SWAN/SOHO Lyman-α Mapping: The Hydrogen Geocorona Extends Well Beyond the Moon
Schmidt, W.; Bertaux, J. -L.; Quémerais, E. +2 more
The Earth's hydrogen exosphere Lyman-α radiation was mapped with the Solar Wind Anisotropies/Solar and Heliospheric Observatory (SWAN/SOHO) instrument in January 1996, 1997, and 1998 (low solar activity). The use of a hydrogen absorption cell allowed to disentangle the interplanetary emission from the geocoronal one and to assign the absorbed sign…