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Volume 26, Issue 1

Issues

New Pulse Timing Measurements of the sdBV Star CS 1246

Zackary L. Hutchens / Brad N. Barlow / Alan Vasquez Soto / Dan E. Reichart
  • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Phillips Hall, 120 E Cameron Ave, Chapel Hill, NC 27514, USA
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/ Josh B. Haislip
  • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Phillips Hall, 120 E Cameron Ave, Chapel Hill, NC 27514, USA
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/ Vladimir V. Kouprianov
  • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Phillips Hall, 120 E Cameron Ave, Chapel Hill, NC 27514, USA
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/ Tyler R. Linder
  • Department of Physics, Eastern Illinois University, 600 Lincoln Ave, Charleston, IL 61920, USA
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/ Justin P. Moore
  • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Phillips Hall, 120 E Cameron Ave, Chapel Hill, NC 27514, USA
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Published Online: 2017-12-29 | DOI: https://doi.org/10.1515/astro-2017-0446

Abstract

CS 1246 is a hot subdwarf B star discovered in 2009 to exhibit a single, large-amplitude radial pulsation. An O-C diagram constructed from this mode revealed reflex motion due to the presence of a low-mass M dwarf, as well as a long-term trend consistent with a decrease in the pulsational period. The orbital reflex motion was later confirmed with radial velocity measurements. Using eight years of data collected with the Skynet Robotic Telescope Network, we show that the pulsation amplitude of CS 1246 is decaying nonlinearly. We also present an updated O-C diagram, which might now indicate a positive Ṗ and a new 2.09 ± 0.05 yr oscillation consistent with orbital reflex motion of the entire inner sdB+dM binary, possibly due to the gravitational influence of a circumbinary planet with minimum mass . However, unlike the presence of the M dwarf, we hesistate to claim this object as a definitive detection since intrinsic variability of the pulsation phase could theoretically produce a similar effect.

Keywords : stars; individual; CS 1246; stars; oscillations; stars; subdwarfs; techniques; miscellaneous

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About the article

Received: 2017-09-30

Accepted: 2017-11-16

Published Online: 2017-12-29

Published in Print: 2017-12-20


Citation Information: Open Astronomy, Volume 26, Issue 1, Pages 252–257, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0446.

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© 2018. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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