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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz


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Volume 27, Issue 1

Issues

Spectroscopic and Photometric Analysis of the HW Vir Star PTF1 J011339.09+225739.1

Maximilian Wolz
  • Corresponding author
  • Dr. Karl Remeis- Observatory & ECAP, Astronomical Institute, Friedrich-Alexander- University of Erlangen-Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germany
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/ Thomas Kupfer
  • Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Passadena, CA 91125, United States of America
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/ Horst Drechsel
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander-University of Erlangen- Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germany
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/ Ulrich Heber
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander-University of Erlangen- Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germany
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/ Andreas Irrgang
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander-University of Erlangen- Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germany
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/ J.J. Hermes
  • Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, United States of America Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, United States of America
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/ Steven Bloemen / David Levitan
  • Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, United States of America
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/ Vik Dhillon
  • Department of Physics & Astronomy, University of Shefleld, Shefleld, S3 7RH, United Kingdom; Instituto de Astrofísica de Canarias (IAC), E-38200 La Laguna, Tenerife, Spain
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/ TomR. Marsh
  • Department of Physics, University ofWarwick, Coventry CV4 7AL, United Kingdom; Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, United States of America
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Published Online: 2018-05-24 | DOI: https://doi.org/10.1515/astro-2018-0011

Abstract

HW Vir systems are rare eclipsing binary systems including a subdwarf B star (sdB) with a faint companion, mostly M-dwarfs. Up to now, 19 HW Vir systems have been published, three of them with substellar companions. We report the spectroscopic as well as photometric observation of the eclipsing sdB binary PTF1 J011339.09+225739.1 (PTF1 J0113) in a close (a=0.722 ± 0.023 R⊙), short period (P = 0.0933731(3)d) orbit. A quantitative spectral analysis of the sdB yields Te.=29280 ± 720 K, log(g)=5.77 ± 0.09 dex, and log(y)=−2.32 ± 0.12. The circular orbital velocity of the sdB of K1=74.2 ± 1.7 km s−1 is derived from the radial velocity curve. Except for the strong reflection effect, no other light contribution of the companion could be detected. The light curves - recorded with ULTRACAM - were analyzed using the Wilson-Devinney code. We find an inclination angle of i=79.88 ± 0.18∘. Because our first attempts to determine q failed, we calculated large grids of synthetic lightcurves for several mass ratios. Because of degeneracy, good solutions for different mass ratios were found - the one at q = 0.24 is consistent with the sdB’s canonical mass (MsdB = 0.47 M⊙). Accordingly, the mass of the companion is M2=0.112 ± 0.003 M⊙. The radii of the two components were also derived: RsdB=0.178 ± 0.006 R⊙ and R2 = 0.158 ± 0.009 R⊙. Thus, the results for the secondary are consistent with an M-dwarf as secondary

Keywords : subdwarfs; binaries: eclipsing; stars: early-type; stars: evolution; stars: fundamental parameters; stars: horizontal-branch

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About the article

Received: 2017-10-10

Accepted: 2017-12-08

Published Online: 2018-05-24


Citation Information: Open Astronomy, Volume 27, Issue 1, Pages 80–90, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2018-0011.

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© 2018 Maximilian Wolz, published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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