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Spectroscopic frequency and mode identification of γ Doradus stars HD 109799 and HD 103257
Pollard, K. R.; Brunsden, E.; Shutt, T. R.
Following frequency and mode identification of two candidate γ Doradus stars, HD 103257 and HD 109799, both can be categorized as bona-fide members of the class. Over 250 high-resolution spectra of the two stars were collected at University of Canterbury Mount John Observatory (UCMJO) using the High Efficiency and Resolution Canterbury University …
Processing GOTO survey data with the Rubin Observatory LSST Science Pipelines II: Forced Photometry and lightcurves
Mullaney, J.; Ulaczyk, K.; Pallé, E. +45 more
We have adapted the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) Science Pipelines to process data from the Gravitational-wave Optical Transient Observer (GOTO) prototype. In this paper, we describe how we used the LSST Science Pipelines to conduct forced photometry measurements on nightly GOTO data. By comparing the photometry…
Electromechanical coupling mechanism for activation and inactivation of an HCN channel
Dai, Gucan; Aman, Teresa K.; DiMaio, Frank +1 more
Pacemaker hyperpolarization-activated cyclic nucleotide-gated (HCN) ion channels exhibit a reversed voltage-dependent gating, activating by membrane hyperpolarization instead of depolarization. Sea urchin HCN (spHCN) channels also undergo inactivation with hyperpolarization which occurs only in the absence of cyclic nucleotide. Here we applied tra…
Say Hello to Algol's New Companion Candidates
Jetsu, Lauri
Constant orbital period ephemerides of eclipsing binaries give the computed eclipse epochs (C). These ephemerides based on the old data cannot accurately predict the observed future eclipse epochs (O). Predictability can be improved by removing linear or quadratic trends from the O - C data. Additional companions in an eclipsing binary system caus…
Systematic search for lensed X-ray sources in the CLASH fields
Nonino, Mario; Grillo, Claudio; Rosati, Piero +8 more
Aims: We exploit the high angular resolution of Chandra to search for unresolved X-ray emission from lensed sources in the field of view of 11 CLASH clusters, whose critical lines and amplification maps were previously obtained with accurate strong-lensing models. We consider a solid angle in the lens plane corresponding to a magnification &m…
Evaluating Flat-Crater Floor Fill Compositions and Morphologies: Insight Into Formation Processes
Rogers, A. D.; Pan, C.; Edwards, C. S.
Numerous impact craters on Mars have been deeply filled, raising questions about the potential processes that contributed to infilling. Previously proposed processes include ponding of impact melt, aeolian sedimentation, lacustrine sedimentation, or volcanic infilling. Better constraints on the infilling processes of flat floor craters are needed …
Multiwavelength observations of the Galactic X-ray binaries IGR J20155+3827 and Swift J1713.4-4219
Masetti, N.; Bird, A. J.; Fiocchi, M. +4 more
In recent years, thanks to the continuous surveys performed by INTEGRAL and Swift satellites, our knowledge of the hard X-ray/soft gamma-ray sky has greatly improved. As a result it is now populated with about 2000 sources, both Galactic and extra-galactic, mainly discovered by IBIS and BAT instruments. Many different follow-up campaigns have been…
Properties of the brightest globular cluster in M 81 based on multicolour observations
Ma, Jun; Wang, Shoucheng
Context. Researching the properties of the brightest globular cluster (referred to as GC1) in M 81 can provide a fossil record of the earliest stages of galaxy formation and evolution. The Beijing-Arizona-Taiwan-Connecticut (BATC) Multicolour Sky Survey has carried out deep exposures of M 81.
Aims: We derive the magnitudes in intermediate-ban…
The Mie representation for Mercury's magnetospheric currents
Glassmeier, K. -H.; Narita, Y.; Motschmann, U. +4 more
Poloidal–toroidal magnetic field decomposition is a useful application of the Mie representation and the decomposition method enables us to determine the current density observationally and unambiguously in the local region of magnetic field measurement. The application and the limits of the decomposition method are tested against the Mercury magn…
Dynamics of variable dusk-dawn flow associated with magnetotail current sheet flapping
Grocott, Adrian; Walach, Maria-Theresia; Lane, James H. +1 more
We present Cluster spacecraft observations from 12 October 2006 of convective plasma flows in the Earth's magnetotail. Earthward flow bursts with a dawnward v⊥y component, observed by Cluster 1 (C1), are inconsistent with the duskward flow that might be expected at the pre-midnight location of the spacecraft. Previous observations have …