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Multipoint Cluster Observations of Kinetic Alfvén Waves, Electron Energization, and O+ Ion Outflow Response in the Mid-Altitude Cusp Associated With Solar Wind Pressure and/or IMF BZ Variations
Chaston, Christopher C.; Hull, Arthur J.; Damiano, Peter A.
We report the properties of low frequency (LF) electromagnetic fluctuations (≤11 Hz) in relation to input electron and ion outflow response observed by Cluster in the mid-altitude cusp during high solar wind dynamic pressure PSW and active magnetospheric conditions (Kp = 4+). The multipoint observations reveal the dynamic int…
The variable stars in the field of NGC 6139: a critical approach to their reddening and membership
Arellano Ferro, A.; Luna, A.; Yepez, M. A. +1 more
We present a CCD VI time-series analysis of the globular cluster NGC 6139 and its variable star population. Using the astrometric data available in Gaia-DR3, we performed a membership analysis that enabled the construction of a clean colour-magnitude diagram (CMD). Variable stars in the field of the cluster reported by Gaia-DR3 and newly discovere…
Analysis of the first coronagraphic multi-band observations of a sungrazing comet
Heinzel, P.; Sasso, C.; Romoli, M. +35 more
Context. Between 24 and 25 December 2021 a sungrazing comet (SOHO-4341) approached the Sun, being observed by "classical" visible light (VL) coronagraphs on board the SOHO and STEREO missions, and also by the innovative Metis coronagraph on board the ESA-NASA Solar Orbiter mission in the VL and ultraviolet (UV H I Lyman-α) band.
Aims: We show…
Polarimetric Study of the Solar Corona During the Total Solar Eclipse on July 2, 2019 with a Liquid-Crystal Polarimeter
Fineschi, Silvano; Liberatore, Alessandro; Capobianco, Gerardo +5 more
The results obtained during the total Solar Eclipse on July 2, 2019, in Chile are presented together with the Eclipse K-corona Polarimeter (EKPol). The EKPol is equipped with an electro-optically modulating Liquid-Crystal Variable Retarder (LCVR) for the polarimetric observation of the solar corona. The use of this technology has been an important…
Evidence of Widespread Volcanic Activity near Hebrus Valles on Mars Revealed by SHARAD
Hamilton, Christopher W.; Holt, John W.; Nerozzi, Stefano +1 more
Hebrus Valles is an outflow channel system in the plain-forming terrains of southeastern Utopia Planitia, Mars. These terrains may have formed through a combination of liquid water and volcanic processes, yet their nature, subsurface structure, and composition remain unclear. We investigate these terrains by mapping subsurface reflectors across 54…
The Kinematics of the Young Stellar Population in the W5 Region of the Cassiopeia OB6 Association: Implication for the Formation Process of Stellar Associations
Lim, Beomdu; Yun, Hyeong-Sik; Park, Byeong-Gon +3 more
The star-forming region W5 is a major part of the Cassiopeia OB6 association. Its internal structure and kinematics may provide hints of the star formation process in this region. Here, we present a kinematic study of young stars in W5 using the Gaia data and our radial velocity data. A total 490 out of 2000 young stars are confirmed as members. T…
XMM-Newton and Chandra Observations of the Candidate Fermi-LAT Pulsar 4FGL J1015.5-6030
Pavlov, George G.; Kargaltsev, Oleg; Younes, George +2 more
4FGL J1015.5-6030 is an unidentified Fermi-LAT source hosting a bright, extended X-ray source whose X-ray spectrum is consistent with that of a young pulsar, yet no pulsations have been found. Here we report on XMM-Newton timing and Chandra imaging observations of the X-ray counterpart of 4FGL J1015.5-6030. We find no significant periodicity from …
Miras as a distance indicator in the CSST, JWST, and Gaia era
Sun, Yan; Zhang, Bo; Chen, Wen +5 more
Mira variables are important distance indicators owing to the clear period–luminosity relation at infrared wavelengths. We have compiled a sample of 343 Galactic Miras selected from the American Association of Variable Star Observers database and Gaia Data Release 3. We used V-band observations from the American Association of Variable Star Observ…
Multiple Populations in Low-mass Globular Clusters: Eridanus
Li, Chengyuan; Baumgardt, Holger; Geisler, Doug +5 more
Multiple populations (MPs), characterized by variations in light elemental abundances, have been found in stellar clusters in the Milky Way, Magellanic Clouds, as well as several other dwarf galaxies. Based on a large number of observations, mass has been suggested to be a key parameter affecting the presence and appearance of MPs in stellar clust…
Multiwavelength Analysis of a Nearby Heavily Obscured AGN in NGC 449
Fang, Guanwen; Gu, Qiusheng; Xu, Jun +5 more
We present the multiwavelength analysis of a heavily obscured active galactic nucleus (AGN) in NGC 449. We first constructed a broadband X-ray spectrum using the latest NuSTAR and XMM-Newton data. Its column density (≃1024 cm-2) and photon index (Γ ≃ 2.4) were reliably obtained by analyzing the broadband X-ray spectrum. Howev…