Search Publications
The Radial Evolution of Magnetic Clouds From Helios to Ulysses
Wang, Yuming; Li, Xiaolei; Cai, Qiangwei +5 more
The evolution of a magnetic cloud (MC) from the inner heliosphere to the outer heliosphere has been investigated for decades. Although many studies have reported on the evolution of MCs, there is no relevant statistical study about the continuous parametric evolution of the flux rope model of the Gold-Hoyle solution for MCs from near the Sun to 5.…
The stability of a liquid-water body below the south polar cap of Mars
Ruiz, Javier; Bramson, Ali M.; Egea-González, Isabel +4 more
Radar data from the Mars Express spacecraft show bright subsurface reflections in the Planum Australe area that could be due to liquid water located at a depth of 1.5 km (Orosei et al., 2018). If this interpretation of the data is correct, the presence of such water would have important implications for the present-day thermal state of the region.…
Instability in the System of the Distant Post-AGB Star LS III +52°24 (IRAS 22023+5249)
Miroshnichenko, A. S.; Klochkova, V. G.; Panchuk, V. E. +2 more
The optical spectra of the B-supergiant LS III +52°24 (IRAS 22023+5249) obtained at the 6-m BTA telescope with a resolution ${R} ≥slant 60{\kern 1pt} {\kern 1pt} 000$ in 2010-2021 revealed signs of wind variability and velocity stratification in the extended atmosphere. The neutral hydrogen lines H$α $ and H$β $ have a P Cyg profile; their wind ab…
Collision of two stellar associations in the nearby Gum Nebula
White, Russel J.; Yep, Alexandra C.
Based on Gaia DR2 data and new CHIRON radial velocities, we have discovered that two nearby stellar associations UPK 535 (318.08 ± 0.29 pc, $25^{+15}_{-10}$ Myr, 174 stars) and Yep 3 (339.54 ± 0.25 pc, $45^{+55}_{-20}$ Myr, 297 stars) in the Gum Nebula have recently collided. We project stars' current positions, motions, and measurement uncertaint…
Hot magnetic halo of NGC 628 (M 74)
Ehle, M.; Weżgowiec, M.; Soida, M. +4 more
Context. In several spiral galaxies that are observed face-on, large-scale ordered magnetic fields (the so-called magnetic arms) were found. One of the explanations was the action of the magnetic reconnection, which leads to a higher ordering of the magnetic fields. Because it simultaneously converts the energy of the magnetic fields into thermal …
Towards a consistent model of the hot quadruple system HD 93206 = QZ Carinæ. I. Observations and their initial analyses
Wolf, M.; Chini, R.; Harmanec, P. +18 more
The hot nine-component system HD 93206, which contains a gravitationally bounded eclipsing Ac1+Ac2 binary (P = 5.9987 d) and a spectroscopic Aa1+Aa2 (P = 20.734 d) binary can provide important insights into the origin and evolution of massive stars. Using archival and new spectra, and a rich collection of ground-based and space photometric observa…
KIC 6951642: A confirmed Kepler γ Doradus - δ Scuti star with intermediate to fast rotation in a possible single-lined binary system
Gizon, L.; Lampens, P.; Samadi-Ghadim, A.
Context. KIC 6951642 has been reported as a candidate hybrid pulsator of type-γ Doradus - δ Scuti from observations of the first quarters of the Kepler mission. The regular patterns seen in the Fourier spectra of the Kepler and Transiting Exoplanet Survey Satellite TESS light curves and the sinusoidal modulation of its surface brightness suggest t…
Mapping of Compositional Diversity and Chronological Ages of Lunar Farside Multiring Mare Moscoviense Basin: Implications to the Middle Imbrian Mare Basalts
Sharma, Manish; Karthi, A.; Arivazhagan, S.
The Mare Moscoviense is an astonishing rare flatland multi-ring basin and one of the recognizable mare regions on the Moon's farside. The mineralogical, chronological, topographical and morphological studies of the maria surface of the Moon provide a primary understanding of the origin and evolution of the mare provinces. In this study, the Chandr…
An ALMA 1.3 millimeter Search for Debris Disks around Solar-type Stars in the Pleiades
MacGregor, Meredith A.; Wilner, David J.; Matthews, Brenda +4 more
Millimeter emission from debris disks around stars of different ages provides constraints on the collisional evolution of planetesimals. We present ALMA 1.3 millimeter observations of a sample of 76 Solar-type stars in the ~115 Myr old Pleiades star cluster. These ALMA observations complement previous infrared observations of this sample by provid…
H I in and behind the Hubble Frontier Field clusters: a deep MeerKAT pilot search out to z ∼ 0.5
Obreschkow, Danail; Heywood, Ian; Deane, Roger +2 more
The Hubble Frontier Fields (HFF) are a selection of well-studied galaxy clusters used to probe dense environments and distant gravitationally lensed galaxies. We explore the 21cm neutral hydrogen (H I) content of galaxies in three of the HFF clusters, Abell 2744 (z = 0.308), Abell S1063 (z = 0.346), and Abell 370 (z = 0.375), to investigate the ev…