Search Publications
Relations between global seismic parameters and activity cycles of the Sun
Chang, Heon-Young; Kim, Ki-Beom
It is suggested that the dependency of the global asteroseismic parameters on stellar properties such as magnetic activity is carefully calibrated with a homogenous data sample in stellar parameters in the sense that the empirical scaling relations of the global asteroseismic parameters are used in estimating fundamental stellar properties. As an …
The complex dynamical past and future of double eclipsing binary CzeV343: Misaligned orbits and period resonance
Prieto, Jose L.; Fausnaugh, Michael M.; De Rosa, Gisella +5 more
CzeV343 (=V849 Aur) was previously identified as a candidate double eclipsing binary (2+2 quadruple), where the orbital periods of the two eclipsing binaries (PA ≈ 1.2 days and PB ≈ 0.8 days) lie very close to a 3:2 resonance. Here, we analyze 11 yr of ground-based photometry, four sectors of Transiting Exoplanet Survey Satel…
Dependence of Pulsation Mode of Cepheids on Metallicity
Ren, Yi; Wang, Shu; Jiang, Biwei +2 more
The Cepheid variables in the Small Magellanic Cloud (SMC), the Large Magellanic Cloud (LMC), the Milky Way, M33, and M31 are used to examine the dependence of pulsation mode on metallicity, which was previously found in red supergiants. The initial samples of Cepheids are collected from the Cepheid catalogs identified from the Optical Gravitationa…
The strongest cool core in REXCESS: Missing X-ray cavities in RXC J2014.8-2430
Donahue, Megan; Mroczkowski, Tony; Clarke, Tracy E. +8 more
We present a broad, multi-wavelength study of RXC J2014.8−2430, the most extreme cool-core cluster in the Representative XMM-Newton Cluster Structure Survey (REXCESS), using Chandra X-ray, Southern Astrophysical Research (SOAR) Telescope spectroscopic and narrow-band imaging, Atacama Large Millimeter/submillimeter Array (ALMA), Very Large Array, a…
Molecular hydrogen in the upper atmospheres of Saturn and Titan
Strobel, Darrell F.
Molecular hydrogen is the third most abundant species in Titan's atmosphere with a tropospheric/lower stratospheric mole fraction of 0.001 derived from Voyager and Cassini measurements and the major species in Saturn's atmosphere. The motivation for this paper is to explore the hypothesis that the corrected H2 density measurements repor…
η Geminorum: an eclipsing semiregular variable star orbited by a companion surrounded by an extended disc
Torres, Guillermo; Sakano, Kristy
We report 11 yr of spectroscopic monitoring of the M-type asymptotic giant branch star η Gem, a semiregular variable and a known spectroscopic binary with a period of 8.2 yr. We combine our radial velocities with others from the literature to provide an improved spectroscopic orbital solution, giving a period of 2979 d, which we then use to predic…
Deep Extragalactic VIsible Legacy Survey: Data Release 1 blended spectra search for candidate strong gravitational lenses
Holwerda, B. W.; Davies, L. J. M.; Siudek, M. +3 more
Here, we present a catalogue of blended spectra in Data Release 1 of the Deep Extragalactic VIsible Legacy Survey (DEVILS) on the Anglo-Australian Telescope. Of the 23 197 spectra, 181 showed signs of a blend of redshifts and spectral templates. We examine these blends in detail for signs of either a candidate strong lensing galaxy or a useful ove…
Plateaus, dips, and rebrightenings during the outbursts of WZ Sge: no magnetic propeller, but a veiling curtain
Knigge, C.; Castro Segura, N.; Long, K. S. +1 more
WZ Sge is the prototype of highly evolved, low-accretion rate dwarf novae (DNe). During the decline from eruptions, its light curve displays a 'dip' followed by ≃10 'echo outbursts'. The standard disc instability model does not account for this behaviour, which is also seen in other low-accretion rate DNe. One recent interpretation for these rapid…
Scattered Light in the Hinode/EIS and SDO/AIA Instruments Measured from the 2012 Venus Transit
Young, Peter R.; Viall, Nicholeen M.
Observations from the 2012 transit of Venus are used to derive empirical formulae for long- and short-range scattered light at locations on the solar disk observed by the Hinode Extreme ultraviolet Imaging Spectrometer (EIS) and the Solar Dynamics Observatory Atmospheric Imaging Assembly (AIA) instruments. Long-range scattered light comes from the…
X-Ray Spectroscopic Evidence of Charge Exchange Emission in the Disk of M51
Wang, Q. Daniel; Zhang, Shuinai; Sun, Wei +3 more
In the disks of spiral galaxies, diffuse soft X-ray emission is known to be strongly correlated with star-forming regions. However, this emission is not simply from a thermal-equilibrium plasma and its origin remains greatly unclear. In this work, we present an X-ray spectroscopic analysis of the emission from the northern hot spot; a region with …