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Intrinsic metallicity variation in the intermediate mass type II globular cluster NGC 1261
Sarajedini, Ata; Monaco, L.; Geisler, D. +5 more
Globular Clusters (GCs) are now well known to almost universally show multiple populations (MPs). The HST UV Legacy Survey of a large number of Galactic GCs in UV filters optimized to explore MPs finds that a small fraction of GCs, termed Type II, also display more complex, anomalous behaviour. Several well-studied Type II GCs show intrinsic Fe ab…
The Pre-He White Dwarfs in Eclipsing Binaries. II. WASP 0843-11
Koo, Jae-Rim; Han, Cheongho; Hong, Kyeongsoo +5 more
We present the Transiting Exoplanet Survey Satellite (TESS) photometry and our high-resolution spectra of the EL CVn-type star 1SWASP J084356.46-113327.5 (WASP 0843-11), which consists of an F-type main-sequence (MS) star and a hotter low-mass helium white dwarf precursor (pre-He WD). In a spectral analysis, double-lined radial velocities (RVs) we…
Detection of an extremely strong magnetic field in the double-degenerate binary merger product HD 144941
Owocki, S. P.; Shultz, M. E.; Kochukhov, O. +2 more
HD 144941 is an extreme He (EHe) star, a rare class of subdwarf OB star formed from the merger of two white dwarf (WD) stars. Uniquely amongst EHe stars, its light curve has been reported to be modulated entirely by rotation, suggesting the presence of a magnetic field. Here, we report the first high-resolution spectropolarimetric observations of …
Joint Suzaku and Chandra observations of the MKW4 galaxy group out to the virial radius
Kraft, Ralph; Gastaldello, Fabio; Sarkar, Arnab +5 more
We present joint Suzaku and Chandra observations of MKW4. With a global temperature of 1.6 keV, MKW4 is one of the smallest galaxy groups that have been mapped in X-rays out to the virial radius. We measure its gas properties from its centre to the virial radius in the north, east, and north-east directions. Its entropy profile follows a power law…
An Insight into the Coupling of CME Kinematics in Inner and Outer Corona and the Imprint of Source Regions
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Despite studying coronal mass ejections (CMEs) for several years, we do not yet have a complete understanding of their kinematics. To this end, it is essential to understand the change in kinematics of the CMEs as they travel from the inner corona (<3 R⊙) up to the higher heights of the outer corona. We conduct a follow-up statistica…
Eclipsing Binaries Found by the EREBOS Project: Gaia DR2 6097540197980557440-a Deeply Eclipsing sdB+dM System
Barlow, Brad N.; Corcoran, Kyle A.; Schaffenroth, Veronika +3 more
We present time-series spectroscopy and photometry of Gaia DR2 6097540197980557440, a new deeply eclipsing hot subdwarf B (sdB) + M dwarf (dM) binary. We discovered this object during the course of the Eclipsing Reflection Effect Binaries from Optical Surveys (EREBOS) project, which aims to find new eclipsing sdB+dM binaries (HW Vir systems) and i…
The Scientific Value of a Sustained Exploration Program at the Aristarchus Plateau
Glotch, Timothy D.; Li, Shuai; Lucey, Paul G. +13 more
The Aristarchus plateau hosts a diversity of volcanic features, including the largest pyroclastic deposit on the Moon, the largest sinuous rille on the Moon, and intrusive and extrusive examples of evolved, Th-rich silicic lithologies. We provide an overview of previous remote-sensing measurements of the Aristarchus plateau and provide new analyse…
Diagnostics of homologous solar-surge plasma as observed by IRIS and SDO
Kayshap, Pradeep; Tripathi, Sharad C.; Singh Payal, Rajdeep +1 more
Surges have regularly been observed in mostly H α 6563 Å and Ca II 8542 Å. However, surge responses to other prominent lines of the interface region (Mg II k 2796.35 Å and h 2803.52 Å, O IV 1401.15 Å, Si IV 1402.77 Å) are not well studied. Here, the evolution and kinematics of six homologous surges are analysed using IRIS and AIA observations. The…
The Quest for the Missing Dust. I. Restoring Large-scale Emission in Herschel Maps of Local Group Galaxies
Gordon, Karl D.; Bot, Caroline; Clark, Christopher J. R. +2 more
Because the galaxies of the Local Group have such large angular sizes, much of their diffuse, large-angular-scale emission is filtered out by the Herschel data reduction process. In this work, we restore this previously missed dust in Herschel observations of the Large Magellanic Cloud, Small Magellanic Cloud, M31, and M33. We do this by combining…
Penumbral decay observed in active region NOAA 12585
Guglielmino, S. L.; Romano, P.; Rouppe van der Voort, L. H. M. +3 more
Context. The physical conditions leading the sunspot penumbra decay are poorly understood so far.
Aims: We investigate the photospheric magnetic and velocity properties of a sunspot penumbra during the decay phase to advance the current knowledge of the conditions leading to this process.
Methods: A penumbral decay was observed with the …