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Asteroseismology of the DAV star KUV 08368+4026
Yang, Y. H.; Chen, Y. H.; Tang, M. Y.
As a DAV star, KUV 08368+4026 was observed by Li et al. in 2009 February, 2009 December, 2010 January, and 2012 February. They extracted 30 frequencies from the reported 300 h observation data and identified 17 independent modes. Based on the frequency splitting relationship, 6 l = 1 modes and 1 l = 2 mode are identified. The seven identified mode…
Multiwavelength and astrometric study of the DBS 89−90−91 embedded clusters region
Orellana, R. B.; Suad, L. A.; Corti, M. A. +1 more
Aims: Our main aims are to improve our understanding of the main properties of the radio source G316.8−0.1 (IRAS 14416−5937) where the DBS 89−90−91 embedded clusters are located, to identify the stellar population present in this region, and to study the interaction of these stars with the interstellar medium.
Methods: We analyzed some c…
Origin of the diffuse 4-8 keV emission in M 82
Gilli, R.; Iwasawa, K.; Gandhi, P. +2 more
We present the first spatially resolved, X-ray spectroscopic study of the 4−8 keV diffuse emission found in the central part of the nearby starburst galaxy M 82 on a few arcsecond scales. The new details that we see allow a number of important conclusions to be drawn on the nature of the hot gas and its origin as well as feedback on the interstell…
Study of Global Photospheric and Chromospheric Flows Using Local Correlation Tracking and Machine Learning Methods I: Methodology and Uncertainty Estimates
Xu, Yan; Denker, Carsten; Wang, Haimin +3 more
Cyclical variations of the solar magnetic fields, and hence the level of solar activity, are among the top interests of space weather research. Surface flows in global-scale, in particular differential rotation and meridional flows, play important roles in the solar dynamo that describes the origin and variation of solar magnetic fields. In princi…
Estimating the optical depth of Saturn's main rings using the Cassini Langmuir Probe
Arridge, Christopher S.; Wahlund, Jan-Erik; Xystouris, Georgios +1 more
A Langmuir Probe (LP) measures currents from incident charged particles as a function of the applied bias voltage. While onboard a spacecraft the particles are either originated from the surrounding plasma, or emitted (e.g. through photoemission) from the spacecraft itself. The obtained current-voltage curve reflects the properties of the plasma i…
Prolonged Record of Hydroclimatic Changes at Antoniadi Crater, Mars
Mangold, N.; Pajola, M.; Cremonese, G. +13 more
The first billion years of Martian geologic history consisted of surface environments and landscapes dramatically different from those seen today, with flowing liquid water sculpting river channels and ponding to form bodies of water. However, the hydro-climatic context, the frequency, and the duration under which these systems existed remain unce…
Rotational radial shear in the low solar photosphere
Corbard, T.; Faurobert, M.; Gelly, B. +2 more
Context. Radial differential rotation is an important physical ingredient in stellar dynamo theory. In the case of the Sun, heliosismology techniques have revealed the existence of a near-surface shear layer covering 15-20% of the upper convection zone. It was recently shown that the rotation velocity gradient is not uniform in this layer and that…
The composition and thermal properties of a cool core lacking a brightest cluster galaxy
Combes, Francoise; Su, Yuanyuan; Olivares, Valeria +3 more
We present a multiwavelength observation of a cool core that does not appear to be associated with any galaxy, in a nearby cluster, Abell 1142. Its X-ray surface brightness peak of ≲2 keV is cooler than the ambient intracluster gas of ≳3 keV, and is offset from its brightest cluster galaxy (BCG) by 80 kpc in projection, representing the largest kn…
The Origin of the Large Magellanic Cloud Globular Cluster NGC 2005
Piatti, Andrés E.; Hirai, Yutaka
The ancient Large Magellanic Cloud (LMC) globular cluster NGC 2005 has recently been reported to have an ex situ origin, thus, setting precedents that the LMC could have partially formed from smaller merged dwarf galaxies. We here provide additional arguments from which we conclude that is also fairly plausible an in situ origin of NGC 2005, based…
Astrometric observations of the main Saturnian satellites from 2004 to 2014 based on Gaia DR3
Zhang, H. Y.; Yan, D.; Qiao, R. C. +1 more
A total of 3169 astrometric positions of the seven main satellites of Saturn: Enceladus, Tethys, Dione, Rhea, Titan, Hyperion and Iapetus were obtained in the time span 2004-2014 from observations made with 1.56 m telescope at Sheshan station of Shanghai Observatory, CAS. We compared our observations to the theoretical positions retrieved from IMC…