• ROBERT H. NELSON

      Articles written in Journal of Astrophysics and Astronomy

    • A comprehensive investigation of the variable overcontact system EH Cancri

      KEVIN B. ALTON ROBERT H. NELSON KAZIMIERZ STEPIEN

      More Details Abstract Fulltext PDF

      Precise multi-color CCD-derived photometric data were obtained from EH Cnc at two sites during 2010, 2014 and 2018 wherein each epoch used a different instrument. This has provided a unique opportunity to investigate parameter uncertainty following Roche modeling of light curves optimized by differential corrections using the Wilson–Devinney code. Furthermore, new radial velocity data from EH Cnc presented in this study for the first time has produced absolute physical and geometric parameters for this A-subtype WUMa-type variable. Analysis of eclipse timing data confirms the presence of sinusoidallikeexcursions in the eclipse timing residuals. We address whether these are due to magnetic activity cycles, the so-called ‘‘Applegate effect’’, or related to a light-time effect (LiTE) resulting from the presence of a third gravitationally bound cool low mass white dwarf. A model using the PAdova & TRieste Stellar Evolution Code (PARSEC) has provided valuable insight about the evolutionary history of EH Cnc as a trinary system.

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    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

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      Posted on July 25, 2019

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