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Massive dust clumps in the envelope of the red supergiant VY Canis Majoris
Kamiński, T.
The envelope of the red supergiant VY CMa has long been considered an extreme example of episodic mass loss that is possibly taking place in other cool and massive evolved stars. Recent (sub-)millimeter observations of the envelope revealed the presence of massive dusty clumps within 800 mas of the star and reinforce the picture of drastic mass-lo…
Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73-033933.0
Reichart, D. E.; Wang, L.; Knigge, C. +21 more
We present high-time-resolution photometry and phase-resolved spectroscopy of the short-period ({P_orb}= 80.52 min) cataclysmic variable SDSS J123813.73-033933.0, observed with the Hubble Space Telescope (HST), the Kepler/K2 mission, and the Very Large Telescope (VLT). We also report observations of the first detected superoutburst. SDSS J1238-033…
Variable dust emission by WC type Wolf-Rayet stars observed in the NEOWISE-R survey
Williams, P. M.
Photometry at 3.4 and 4.6 {µ m} of 128 Population I WC type Wolf-Rayet stars in the Galaxy and 12 in the Large Magellanic Cloud (LMC) observed in the WISE NEOWISE-R survey was searched for evidence of circumstellar dust emission and its variation. Infrared spectral energy distributions (SEDs) were assembled, making use of archival r, i, Z, a…
Manifestations of Three-dimensional Magnetic Reconnection in an Eruption of a Quiescent Filament: Filament Strands Turning to Flare Loops
Aulanier, Guillaume; Dudík, Jaroslav; Lörinčík, Juraj
We report on observations of the conversion of bright filament strands into flare loops during the 2012 August 31 filament eruption. Prior to the eruption, individual bright strands composing one of the legs of the filament were observed in the 171 Å filter channel data of the Atmospheric Imaging Assembly. After the onset of the eruption, one of t…
Nature of a shell of young stars in the outskirts of the Small Magellanic Cloud
Bell, Eric F.; Carballo-Bello, Julio A.; Grebel, Eva K. +36 more
Context. Understanding the evolutionary history of the Magellanic Clouds requires an in-depth exploration and characterization of the stellar content in their outer regions, which ultimately are key to tracing the epochs and nature of past interactions.
Aims: We present new deep images of a shell-like overdensity of stars in the outskirts of …
New Constraints on Early-type Galaxy Assembly from Spectroscopic Metallicities of Globular Clusters in M87
Romanowsky, Aaron J.; Strader, Jay; Brodie, Jean +1 more
The observed characteristics of globular cluster (GC) systems, such as metallicity distributions, are commonly used to place constraints on galaxy formation models. However, obtaining reliable metallicity values is particularly difficult because of our limited means to obtain high quality spectroscopy of extragalactic GCs. Often, “color-metallicit…
The Cold Circumgalactic Environment of MAMMOTH-I: Dynamically Cold Gas in the Core of an Enormous Lyα Nebula
Prochaska, J. Xavier; Lehnert, Matthew D.; Cai, Zheng +2 more
The MAMMOTH-I Nebula at redshift 2.3 is one of the largest known Lyα nebulae in the universe, spanning ∼440 kpc. Enormous Lyα nebulae like MAMMOTH-I typically trace the densest and most active regions of galaxy formation. Using sensitive low-surface-brightness observations of CO(1-0) with the Very Large Array, we trace the cold molecular gas in th…
Infrared Spectroscopy of Symbiotic Stars. XII. The Neutron Star SyXB System 4U 1700+24 = V934 Herculis
Mikołajewska, Joanna; Fekel, Francis C.; Hinkle, Kenneth H. +3 more
The X-ray symbiotic (SyXB) V934 Her = 4U 1700+24 is an M giant-neutron star (NS) binary system. Employing optical and infrared radial velocities spanning 29 yr combined with the extensive velocities in the literature, we compute the spectroscopic orbit of the M giant in that system. We determine an orbital period of 4391 days, or 12.0 yr, the long…
Molecular Cloud Distances Based on the MWISP CO Survey and Gaia DR2
Xu, Ye; Su, Yang; Yan, Qing-Zeng +2 more
We present a new method of calculating distances of molecular clouds in the Galactic plane, using CO observations and the Gaia DR2 parallax and G-band extinction (A G ) measurements. Due to the complexity of dust environments in the Galactic plane, A G contains irregular variations, which are difficult to model. To overcom…
Probing ISM Structure in Trumpler 14 and Carina I Using the Stratospheric Terahertz Observatory 2
van der Tak, Floris F. S.; Tolls, Volker; Horiuchi, Shinji +26 more
We present observations of the Trumpler 14/Carina I region carried out using the Stratospheric Terahertz Observatory 2. The Trumpler 14/Carina I region is in the western part of the Carina Nebula Complex (CNC), which is one of the most extreme star-forming regions in the Milky Way. We observed Trumpler 14/Carina I in the 158 µm transition of…