A cautionary tale of interpreting O−C diagrams: period instability in a classical RR Lyr Star Z CVn mimicking as a distant companion Article Swipe
M. Skarka
,
Jiří Liška
,
R. Dřevěný
,
E. Guggenberger
,
Á. Sódor
,
Thomas Garden Barnes
,
K. Kolenberg
·
YOU?
·
· 2017
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stx2737
YOU?
·
· 2017
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/stx2737
We present a comprehensive study of Z CVn, an RR Lyrae star that shows\nlong-term cyclic variations of its pulsation period. A possible explanation\nsuggested from the shape of the O-C diagram is the light travel-time effect,\nwhich we thoroughly examine. We used original photometric and spectroscopic\nmeasurements and investigated the period evolution using available maximum\ntimes spanning more than one century. If the binary hypothesis is valid, Z CVn\norbits around a black hole with minimal mass of $56.5$ $\\mathfrak{M}_{\\odot}$\non a very wide ($P_{\\rm orbit}=78.3$ years) and eccentric orbit ($e=0.63$). We\ndiscuss the probability of a formation of a black hole-RR Lyrae pair and,\nalthough we found it possible, there is no observational evidence of the black\nhole in the direction to Z CVn. However, the main objection against the binary\nhypothesis is the comparison of the systemic radial velocity curve model and\nspectroscopic observations that clearly show that Z CVn cannot be bound in such\na binary. Therefore, the variations of pulsation period are likely intrinsic to\nthe star. This finding represents a discovery/confirmation of a new type of\ncyclic period changes in RR Lyrae stars. By the analysis of our photometric\ndata, we found that the Blazhko modulation with period of 22.931 d is strongly\ndominant in amplitude. The strength of the phase modulation varies and is\ncurrently almost undetectable. We also estimated photometric physical\nparameters of Z CVn and investigated their variations during the Blazhko cycle\nusing the Inverse Baade-Wesselink method.\n
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- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/stx2737
- https://academic.oup.com/mnras/article-pdf/474/1/824/22279954/stx2737.pdf
- OA Status
- bronze
- Cited By
- 12
- References
- 104
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W2766616578
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- OpenAlex ID
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https://openalex.org/W2766616578Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1093/mnras/stx2737Digital Object Identifier
- Title
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A cautionary tale of interpreting O−C diagrams: period instability in a classical RR Lyr Star Z CVn mimicking as a distant companionWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2017Year of publication
- Publication date
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2017-10-18Full publication date if available
- Authors
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M. Skarka, Jiří Liška, R. Dřevěný, E. Guggenberger, Á. Sódor, Thomas Garden Barnes, K. KolenbergList of authors in order
- Landing page
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https://doi.org/10.1093/mnras/stx2737Publisher landing page
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https://academic.oup.com/mnras/article-pdf/474/1/824/22279954/stx2737.pdfDirect link to full text PDF
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YesWhether a free full text is available
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bronzeOpen access status per OpenAlex
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https://academic.oup.com/mnras/article-pdf/474/1/824/22279954/stx2737.pdfDirect OA link when available
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Physics, Astrophysics, Period (music), Instability, Astronomy, Star (game theory), Quantum mechanics, AcousticsTop concepts (fields/topics) attached by OpenAlex
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12Total citation count in OpenAlex
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2025: 2, 2023: 1, 2022: 1, 2021: 4, 2019: 2Per-year citation counts (last 5 years)
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104Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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