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Testing the models of X-ray driven photoevaporation with accreting stars in the Orion Nebula Cluster
Manara, C. F.; Preibisch, T.; Ercolano, B. +1 more
Context. Recent works highlight the importance of stellar X-rays on the evolution of the circumstellar disks of young stellar objects, especially for disk photoevaporation.
Aims: A signature of this process may be seen in the so far tentatively observed dependence of stellar accretion rates on X-ray luminosities. According to models of X-ray …
Resolved Nuclear Kinematics Link the Formation and Growth of Nuclear Star Clusters with the Evolution of Their Early- and Late-type Hosts
Böker, Torsten; Neumayer, Nadine; Emsellem, Eric +7 more
We present parsec-scale kinematics of 11 nearby galactic nuclei, derived from adaptive-optics assisted integral-field spectroscopy at (near-infrared) CO band-head wavelengths. We focus our analysis on the balance between ordered rotation and random motions, which can provide insights into the dominant formation mechanism of nuclear star clusters (…
Isochrone fitting of Galactic globular clusters - III. NGC 288, NGC 362, and NGC 6218 (M12)
Gontcharov, George A.; Mosenkov, Aleksandr V.; Khovritchev, Maxim Yu +6 more
We present new isochrone fits to colour-magnitude diagrams of the Galactic globular clusters NGC 288, NGC 362, and NGC 6218 (M12). We utilize a lot of photometric bands from the ultraviolet to mid-infrared by use of data from the HST, Gaia, unWISE, Pan-STARRS, and other photometric sources. In our isochrone fitting, we use theoretical models and i…
Large Adaptive Optics Survey for Substellar Objects around Young, Nearby, Low-mass Stars with Robo-AO
Baranec, Christoph; Duev, Dmitry A.; Jensen-Clem, Rebecca +16 more
We present results from the Large Adaptive optics Survey for Substellar Objects, where the goal is to directly image new substellar companions (<70 MJup) at wide orbital separations (≳50 au) around young (≲300 Myr), nearby (<100 pc), low-mass (≈0.1-0.8 ${M}_{\odot }$ ) stars. We report on 427 young stars imaged in the visible (i')…
VVV-WIT-08: the giant star that blinked
Smith, Leigh C.; Udalski, Andrzej; Minniti, Dante +11 more
We report the serendipitous discovery of a late-type giant star that exhibited a smooth, eclipse-like drop in flux to a depth of 97 per cent. Minimum flux occurred in 2012 April and the total event duration was a few hundred days. Light curves in V, I, and Ks from the Optical Gravitational Lensing Experiment and VISTA Variables in the V…
Electron Densities in the Solar Corona Measured Simultaneously in the Extreme Ultraviolet and Infrared
Del Zanna, Giulio; Dudík, Jaroslav; Dzifčáková, Elena +5 more
Accurate measurements of electron density are critical for determination of the plasma properties in the solar corona. We compare the electron densities diagnosed from Fe XIII lines observed by the Extreme-Ultraviolet Imaging Spectrometer (EIS) onboard the Hinode mission with the near-infrared (NIR) measurements provided by the ground-based Corona…
The Center of Expansion and Age of the Oxygen-rich Supernova Remnant 1E 0102.2-7219
Drout, Maria R.; Blair, William P.; Margutti, Raffaella +8 more
We present new proper-motion measurements of optically emitting oxygen-rich knots of supernova remnant 1E 0102.2-7219 (E0102), which are used to estimate the remnant's center of expansion and age. Four epochs of high-resolution Hubble Space Telescope images spanning 19 yr were retrieved and analyzed. We found a robust center of expansion of α = 1<…
BepiColombo's cruise phase: unique opportunity for synergistic observations
André, N.; Escoubet, C. P.; Müller, D. +31 more
The investigation of multi-spacecraft coordinated observations during the cruise phase of BepiColombo (ESA/JAXA) are reported, with a particular emphasis on the recently launched missions, Solar Orbiter (ESA/NASA) and Parker Solar Probe (NASA). Despite some payload constraints, many instruments onboard BepiColombo are operating during its cruise p…
VLA Measurements of Faraday Rotation Through a Coronal Mass Ejection Using Multiple Lines of Sight
Ascione, Madison L.; Kooi, Jason E.; Ashas, Mohammad +2 more
Coronal mass ejections (CMEs) are large eruptions of magnetized plasma from the Sun that play an important role in space weather. The key to understanding the fundamental physics of a CME is measurement of the plasma properties within heliocentric distances of <20 R⊙. Faraday rotation, a radioastronomical propagation measurement, is …
Combining magneto-hydrostatic constraints with Stokes profiles inversions. II. Application to Hinode/SP observations
Pastor Yabar, A.; Ruiz Cobo, B.; Borrero, J. M.
Context. Inversion techniques applied to the radiative transfer equation for polarized light are capable of inferring the physical parameters in the solar atmosphere (temperature T, magnetic field B, and line-of-sight velocity vlos) from observations of the Stokes vector (i.e., spectropolarimetric observations) in spectral lines. Infere…