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Sun-as-a-star Analyses of Various Solar Active Events Using Hα Spectral Images Taken by SMART/SDDI
Namekata, Kosuke; Ichimoto, Kiyoshi; Ishii, Takako T. +2 more
Sun-as-a-star analyses in which observational data is spatially integrated are useful for interpreting stellar data. For future applications to stellar observations, we performed Sun-as-a-star analyses of Hα spectra for various active events on the Sun, not only for flares and filament eruptions/surges on the solar disk, but also for eruptions of …
The Gaia-ESO Survey: Target selection of open cluster stars
Gilmore, G.; Bayo, A.; Jordi, C. +38 more
Context. The Gaia-ESO Survey (GES) is a public, high-resolution spectroscopic survey, conducted with the multi-object spectrograph Fibre Large Array Multi Element Spectrograph (FLAMES) on the Very Large Telescope (European Southern Observatory, ESO, Cerro Paranal, Chile) from December 2011 to January 2018. Gaia-ESO has targeted all the main stella…
Observational constraints on gas disc sizes in the protoplanetary discs of multiple systems in the Taurus region
Lodato, G.; Ménard, F.; van der Plas, G. +13 more
The formation of multiple stellar systems is a natural by-product of the star-formation process, and its impact on the properties of protoplanetary discs and on the formation of planets is not yet fully understood. To date, no detailed uniform study of the gas emission from a sample of protoplanetary discs around multiple stellar systems has been …
The Pristine dwarf galaxy survey - IV. Probing the outskirts of the dwarf galaxy Boötes I
Sestito, Federico; McConnachie, Alan W.; Navarro, Julio F. +12 more
We present a new spectroscopic study of the dwarf galaxy Boötes I (Boo I) with data from the Anglo-Australian Telescope and its AAOmega spectrograph together with the Two Degree Field multi-object system. We observed 36 high-probability Boo I stars selected using Gaia Early Data Release 3 proper motions and photometric metallicities from the Prist…
The gravitational field of X-COP galaxy clusters
Pointecouteau, E.; Eckert, D.; Ettori, S. +2 more
The mass profiles of massive dark matter halos are highly sensitive to the nature of dark matter and potential modifications of the theory of gravity on large scales. The Λ cold dark matter (CDM) paradigm makes strong predictions on the shape of dark matter halos and on the dependence of the shape parameters on halo mass, such that any deviation f…
The width of Herschel filaments varies with distance
Panopoulou, G. V.; Smith, R. J.; Ntormousi, E. +5 more
Context. Filamentary structures in nearby molecular clouds have been found to exhibit a characteristic width of 0.1 pc, as observed in dust emission. Understanding the origin of this universal width has become a topic of central importance in the study of molecular cloud structure and the early stages of star formation.
Aims: We investigate h…
Extragalactic fast X-ray transient candidates discovered by Chandra (2000-2014)
Bauer, F. E.; Brandt, W. N.; Xue, Y. Q. +7 more
Context. Extragalactic fast X-ray transients (FXRTs) are short flashes of X-ray photons of unknown origin that last a few seconds to hours.
Aims: Our ignorance about their physical mechanisms and progenitor systems is due in part to the lack of clear multiwavelength counterparts in most cases, because FXRTs have only been identified serendipi…
A systematic review and meta-analysis of Digital elevation model (DEM) fusion: pre-processing, methods and applications
Okolie, Chukwuma J.; Smit, Julian L.
The remote sensing community has identified data fusion as one of the key challenging topics of the 21st century. The subject of image fusion in two-dimensional (2D) space has been covered in several published reviews. However, the special case of 2.5D/3D Digital Elevation Model (DEM) fusion has not been addressed till date. DEM fusion is a key ap…
First Results on RR Lyrae Stars with the TESS Space Telescope: Untangling the Connections between Mode Content, Colors, and Distances
Smolec, R.; Christensen-Dalsgaard, J.; Derekas, A. +25 more
The Transiting Exoplanet Survey Satellite (TESS) space telescope is collecting continuous, high-precision optical photometry of stars throughout the sky, including thousands of RR Lyrae stars. In this paper, we present results for an initial sample of 118 nearby RR Lyrae stars observed in TESS Sectors 1 and 2. We use differential image photometry …
A Survey of CO, CO2, and H2O in Comets and Centaurs
Bauer, James; Harrington Pinto, Olga; Womack, Maria +1 more
CO and CO2 are the two dominant carbon-bearing molecules in comae and have major roles in driving activity. Their relative abundances also provide strong observational constraints to models of solar system formation and evolution but have never been studied together in a large sample of comets. We carefully compiled and analyzed publish…