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A photometric study of two neglected eclipsing binaries
Fedurco, M.; Parimucha, Š.; Kudak, V. +1 more
We present the first BVR photometry, period variation and photometric light curve analysis of two poorly studied eclipsing binaries, V1321 Cyg and CR Tau. Observations were carried out from November 2017 to January 2020 at the observatory of Uzhhorod National University. Period variations were studied using all available early published as well as…
Search for variable stars in the open cluster NGC 1245
Zhang, Yu; Liu, Jin-Zhong; Zeng, Xiang-Yun +5 more
We used the Nanshan 1m telescope of Xinjiang Astronomical Observatory to investigate variable stars in the region of NGC 1245. We detected 55 variable stars in the field of view, 42 of them are newly discovered: six binaries, 22 pulsating stars, 14 unclassified variables. We discussed the physical properties and classifications of the variable sta…
Simulating Photometric Images of Moving Targets with Photon-mapping
Chen, Xu; Hu, Shaoming; Du, Junju +2 more
We present a novel, easy-to-use method based on the photon-mapping technique to simulate photometric images of moving targets. Realistic images can be created in two passes: photon tracing and image rendering. The nature of light sources, tracking mode of the telescope, point-spread function, and specifications of the CCD are taken into account in…
Analysis of Previously Classified White Dwarf-Main-sequence Binaries Using Data from the APOGEE Survey
Cunha, Katia; Majewski, Steven R.; Stassun, Keivan G. +12 more
We present analyses of near-infrared spectroscopic data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey for 45 previously confirmed or candidate white dwarf-main-sequence (WDMS) binaries identified by the optical Sloan Digital Sky Survey (SDSS) and LAMOST surveys. Among these 45 systems, we classify three as having …
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 …