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Astrochemistry as a Tool To Follow Protostellar Evolution: The Class I Stage
Bianchi, Eleonora; Ceccarelli, Cecilia; Codella, Claudio +3 more
The latest developments in astrochemistry have shown how some molecular species can be used as a tool to study the early stages of the solar-type star formation process. Among them, the more relevant species are the interstellar complex organic molecules (iCOMs) and the deuterated molecules. Their analysis give us information on the present and pa…
The WAGGS project - II. The reliability of the calcium triplet as a metallicity indicator in integrated stellar light
Kamann, Sebastian; Schiavon, Ricardo P.; Foster, Caroline +12 more
Using data from the WiFeS Atlas of Galactic Globular cluster Spectra, we study the behaviour of the calcium triplet (CaT), a popular metallicity indicator in extragalactic stellar population studies. A major caveat of these studies is that the potential sensitivity to other stellar population parameters such as age, calcium abundance, and the init…
New β Cep pulsators discovered with K2 space photometry
Aerts, C.; Bowman, D. M.; Burssens, S. +3 more
We present the discovery of three new β Cep pulsators, three new pulsators with frequency groupings, and frequency patterns in a B3Ib star, all of which show pulsations with frequencies as high as about 17 d-1, with K2 space mission photometry. Based on a Fourier analysis and iterative pre-whitening, we present a classification and eval…
In-flight Characterization and Calibration of the Juno-ultraviolet Spectrograph (Juno-UVS)
Gérard, Jean-Claude; Kammer, Joshua A.; Gladstone, G. Randall +9 more
Juno is the first polar orbiter around Jupiter. Juno possesses a suite of instruments designed to measure the electron and ion populations in the Jupiter magnetosphere, leading to the powerful Jovian aurorae. The Ultraviolet Spectrograph onboard Juno (Juno-UVS) is a photon-counting imaging spectrograph (68-210 nm), designed to observe and characte…
A treatment procedure for GMOS/IFU data cubes: application to NGC 2835
Ricci, T. V.; Ferrari, Fabricio; Steiner, J. E. +3 more
We present a set of treatment techniques for GMOS/IFU data cubes, including correction of the differential atmospheric refraction; Butterworth spatial filtering, to remove high spatial-frequency noise; instrumental fingerprint removal; Richardson-Lucy deconvolution, to improve the spatial resolution of the observations. A comparison with HST image…
Measuring the Magnetic Field of Young Stars Using iSHELL Observations: BP Tau and V347 Aur
Flores, C.; Boogert, A.; Connelley, M. S. +1 more
While it has been suggested that there is a connection between the magnetic properties and the internal structure of young stars, there have not been enough magnetic measurements to firmly establish such a correlation at the earliest ages. Here, we contribute to this endeavor by presenting stellar parameters and magnetic field strength measurement…
Hubble Space Telescope analysis of stellar populations within the globular cluster G1 (Mayall II) in M 31
Milone, A. P.; Bedin, L. R.; Rich, R. M. +5 more
In this paper, we present a multiwavelength analysis of the complex stellar populations within the massive globular cluster Mayall II (G1), a satellite of the nearby Andromeda galaxy projected at a distance of 40 kpc. We used images collected with the Hubble Space Telescope in UV, blue and optical filters to explore the multiple stellar population…
Flipping-up the field: gravitational feedback as a mechanism for young clusters dispersal
Kounkel, Marina; Hernández, Jesús; Román-Zúñiga, Carlos +3 more
Recent analyses of Gaia data have provided direct evidence that most young stellar clusters are in a state of expansion, with velocities of the order of ∼0.5 km s-1. Traditionally, expanding young clusters have been pictured as entities that became unbound due to the lack of gravitational binding once the gas from the parental cloud tha…
The New EXor Outburst of ESO-Hα 99 Observed by Gaia ATLAS and TESS
Kochanek, C. S.; Tonry, John; Vallely, Patrick J. +11 more
We report photometry and spectroscopy of the outburst of the young stellar object ESO-Hα99. The outburst was first noticed in Gaia alert Gaia18dvc and later by the Asteroid Terrestrial-impact Last Alert System (ATLAS). We have established the outburst light curve with archival ATLAS orange filter photometry, Gaia data, new V-band photometry, and J…
A connection between accretion states and the formation of ultrarelativistic outflows in a neutron star X-ray binary
Motta, S. E.; Fender, R. P.
The nearby accreting neutron star binary Sco X-1 is the closest example of ongoing relativistic jet production at high Eddington ratios. Previous radio studies have revealed that alongside mildly relativistic, radio-emitting ejecta, there is at times a much faster transfer of energy from the region of the accretion flow along the jet. The nature o…