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Solar wind Alfvénicity during solar cycle 23 and 24. Perspective for future observations with Parker Solar Probe and Solar Orbiter
Bruno, R.; Lepri, S. T.; Zhao, L. +5 more
Context. Alfvénic fluctuations are ubiquitous features observed in solar wind, especially in the inner heliosphere. However, strong Alfvénic fluctuations are recovered in the near-Earth solar wind too, mainly in fast streams, but also in some cases in slow wind intervals, as highlighted in recent studies.
Aims: The present study focuses on a …
The eclipsing binary systems with δ Scuti component - I. KIC 10661783
Daszyńska-Daszkiewicz, J.; Szewczuk, W.; Miszuda, A.
We present a comprehensive study of the eclipsing binary system KIC 10661783. The analysis of the whole Kepler light curve, corrected for the binary effects, reveals a rich oscillation spectrum with 590 significant frequency peaks, 207 of which are independent. In addition to typical δ Scuti (δ Sct) frequencies, we find small-amplitude signals in …
ALMA and MUSE observations reveal a quiescent multi-phase circumgalactic medium around the z ≃ 3.6 radio galaxy 4C 19.71
Lehnert, Matthew D.; De Breuck, Carlos; Vernet, Joël +2 more
We present MUSE at VLT imaging spectroscopy of rest-frame ultraviolet emission lines and ALMA observations of the [C I] 3P1-3P0 emission line, probing both the ionized and diffuse molecular medium around the radio galaxy 4C 19.71 at z ≃ 3.6. This radio galaxy has extended Lyα emission over a region ∼100 …
On the Use of Field RR Lyrae as Galactic Probes. V. Optical and Radial Velocity Curve Templates
Lemasle, B.; Latour, M.; Zoccali, M. +29 more
We collected the largest spectroscopic catalog of RR Lyrae (RRLs) including ≈20,000 high-, medium-, and low-resolution spectra for ≈10,000 RRLs. We provide the analytical forms of radial velocity curve (RVC) templates. These were built using 36 RRLs (31 fundamental-split into three period bins-and five first-overtone pulsators) with well-sampled R…
Solar Wind Helium Abundance Heralds Solar Cycle Onset
McIntosh, Scott W.; Kasper, Justin C.; Leamon, Robert J. +1 more
We study the solar wind helium-to-hydrogen abundance's (AHe) relationship to solar cycle onset. Using OMNI/Lo data, we show that AHe increases prior to sunspot number (SSN) minima. We also identify a rapid depletion and recovery in AHe that occurs directly prior to cycle onset. This AHe shutoff happens a…
The Lithium Abundances from the Large Sky Area Multi-object Fiber Spectroscopic Telescope Medium-resolution Survey. I. The Method
Zhang, Yong; Gao, Qi; Yan, Hong-Liang +9 more
One of the purposes of taking spectra for millions of stars through the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) medium-resolution survey (MRS) is to obtain the elemental abundances, so that one can trace the origin and evolution for the element of interests. Lithium is one of such elements of great importance, which exhi…
Oscillations and Mass Draining that Lead to a Sympathetic Eruption of a Quiescent Filament
Xu, Zhe; Zhang, Qingmin; Zhang, Yanjie +3 more
In this paper, we present a multiwavelength analysis to mass draining and oscillations in a large quiescent filament prior to its successful eruption on 2015 April 28. The eruption of a smaller filament that was parallel and in close, ~350″ proximity was observed to induce longitudinal oscillations and enhance mass draining within the filament of …
Binary Fractions of G and K Dwarf Stars Based on Gaia EDR3 and LAMOST DR5: Impacts of the Chemical Abundances
Niu, Zexi; Liu, Jifeng; Wang, Song +1 more
Based on the large volume Gaia Early Data Release 3 and LAMOST Data Release 5 data, we estimate the bias-corrected binary fractions of the field late G and early K dwarfs. A stellar locus outlier method is used in this work, which works well for binaries of various periods and inclination angles with single-epoch data. With a well-selected, distan…
Higher Compact Multiple Occurrence around Metal-poor M-dwarfs and Late-K-dwarfs
Bedell, Megan; Dittmann, Jason A.; Ballard, Sarah +1 more
The planet-metallicity correlation serves as a potential link between exoplanet systems as we observe them today and the effects of bulk composition on the planet formation process. Many observers have noted a tendency for Jovian planets to form around stars with higher metallicities; however, there is no consensus on a trend for smaller planets. …
Regulating Star Formation in Nearby Dusty Galaxies: Low Photoelectric Efficiencies in the Most Compact Systems
Inami, H.; Pope, A.; Armus, L. +5 more
Star formation in galaxies is regulated by heating and cooling in the interstellar medium (ISM). In particular, the processing of molecular gas into stars will depend strongly on the ratio of gas heating to gas cooling in the neutral gas around sites of recent star formation. In this work, we combine mid-infrared (mid-IR) observations of polycycli…