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Type IIP Supernova Progenitors. II. Stellar Mass and Obscuration by the Dust in the Circumstellar Medium
Ray, Alak; Wagle, Gururaj A.
It has been well established from a variety of observations that red supergiants (RSGs) lose a lot of mass in stellar wind. Dust that has formed in this emitted gas over a few decades before core-collapse can lead to substantial extinction and obscure the intrinsic luminosity of the progenitor RSG. This may lead to a difficulty in determining the …
Determination of Size, Albedo, and Thermal Inertia of 10 Vesta Family Asteroids with WISE/NEOWISE Observations
Ji, Jianghui; Jiang, Haoxuan; Yu, Liangliang
In this work, we investigate the size, thermal inertia, surface roughness, and geometric albedo of 10 Vesta family asteroids using the Advanced Thermophysical Model, based on the thermal-infrared data acquired by mainly NASA's Wide-field Infrared Survey Explorer. Here, we show that the average thermal inertia and geometric albedo of the investigat…
High-Resolution Radio Observations of Five Optically Selected Type 2 Quasars
Paragi, Zsolt; Krezinger, Máté; Frey, Sándor +1 more
Many low-luminosity active galactic nuclei (AGNs) contain a compact radio core which can be observed with high angular resolution using very long baseline interferometry (VLBI). Combining arcsec-scale structural information with milliarcsec-resolution VLBI imaging is a useful way to characterise the objects and to find compact cores on parsec scal…
ESPRESSO highlights the binary nature of the ultra-metal-poor giant HE 0107-5240
Rebolo, R.; Allende Prieto, C.; Bonifacio, P. +29 more
Context. The vast majority of the known stars of ultra low metallicity ([Fe/H] < -4.5) are known to be enhanced in carbon, and belong to the "low-carbon band" (A(C) = log(C/H)+12 ≤ 7.6). It is generally, although not universally, accepted that this peculiar chemical composition reflects the chemical composition of the gas cloud out of which the…
Recurrent Cometary Activity in Near-Earth Object (3552) Don Quixote
Smith, Howard A.; Hora, Joseph L.; Agarwal, Jessica +12 more
We report on observations of activity in near-Earth object (3552) Don Quixote using the Spitzer Space Telescope and ground-based telescopes around its 2018 perihelion passage. Spitzer observations obtained six months before perihelion show extended emission around the target's nucleus that is most likely caused by molecular band emission from eith…
Dust and star formation in the centre of NGC 3311
Hilker, M.; Richtler, T.; Barbosa, C. E. +1 more
Context. NGC 3311 is the central galaxy of the Hydra I galaxy cluster. It has a hot interstellar medium and hosts a central dust lane with emission lines. These dust lanes are frequent in elliptical galaxies, but the case of NGC 3311 might be particularly interesting for problems of dust lifetime and the role of cool gas in the central parts.
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Adiabatic Invariants Calculations for Cluster Mission: A Long-Term Product for Radiation Belts Studies
Kronberg, Elena A.; Daly, Patrick W.; Shprits, Yuri Y. +3 more
Young Stars near Cometary Globule CG 30 in the Tumultuous Gum Nebula
White, Russel J.; Yep, Alexandra C.
We have conducted a high-dispersion (R ∼ 34,000) optical spectroscopic study of 10 young stars near the cometary globule CG 30 in the Gum Nebula, a diffuse H II region home to at least 32 cometary globules. All 10 spectroscopically observed stars at the nebula's northern edge are of low mass (spectral types M4.5-K5), have broad Hα emission, and sh…
X-raying winds in distant quasars: The first high-redshift wind duty cycle
Cappi, M.; Vignali, C.; Dadina, M. +6 more
Aims: Theoretical models of wind-driven feedback from active galactic nuclei (AGN) often identify ultra-fast outflows as being the main agent in the generation of galaxy-sized outflows, which are possibly the main actors in establishing so-called AGN-galaxy co-evolution. Ultra-fast outflows are well characterized in local AGN but much less is…
Discovery of a near-infrared bar and a pseudo-bulge in the collisional ring galaxy Cartwheel
Mayya, Y. D.; Barway, Sudhanshu; Robleto-Orús, Aitor
We report the discovery of a bar, a pseudo-bulge, and unresolved point source in the archetype collisional ring galaxy Cartwheel using careful morphological analysis of a near-infrared (NIR) Ks-band image of excellent quality (seeing = 0.42″) at the ESO archive. The bar is oval-shaped with a semi-major axis length of 3.23