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First Results on RR Lyrae Stars with the TESS Space Telescope: Untangling the Connections between Mode Content, Colors, and Distances

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DOI

  • L. Molnar, Eotvos Lorand Univ, Eotvos Lorand University, Inst Phys
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  • A. Bodi, Eotvos Lorand Univ, Eotvos Lorand University, Inst Phys
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  • A. Pal, MIT, Massachusetts Institute of Technology (MIT), Kavli Inst Astrophys & Space Res
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  • A. Bhardwaj, Korea Astron & Space Sci Inst, Korea Astronomy & Space Science Institute (KASI)
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  • F-J Hambsch, Bundesdeutsch Arbeitsgemeinschaft Veranderl Stern
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  • J. M. Benko, MTA CSFK Lendulet Near Field Cosmol Res Grp, Hungarian Academy of Sciences, Hungarian Research Centre for Astronomy & Earth Sciences
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  • A. Derekas, MTA ELTE Exoplanet Res Grp
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  • M. Ebadi, Univ Tehran, University of Tehran, Inst Geophys
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  • M. Joyce, ARC Ctr Excellence All Sky Astrophys 3 Dimens AST
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  • A. Hasanzadeh, Univ Tehran, University of Tehran, Inst Geophys
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  • K. Kolenberg, Vrije Univ Brussel VUB, Vrije Universiteit Brussel, Phys & Astron Dept
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  • M. B. Lund, CALTECH, California Institute of Technology, IPAC NExScI
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  • J. M. Nemec, Camosun Coll, Dept Phys & Astron
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  • H. Netzel, Polish Acad Sci, Polish Academy of Sciences, Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences, Nicolaus Copernicus Astron Ctr
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  • C. -C Ngeow, Natl Cent Univ, National Central University, Grad Inst Astron
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  • J. Pepper, Lehigh Univ, Lehigh University, Dept Phys
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  • E. Plachy, MTA CSFK Lendulet Near Field Cosmol Res Grp, Hungarian Academy of Sciences, Hungarian Research Centre for Astronomy & Earth Sciences
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  • Z. Prudil, Heidelberg Univ, Ruprecht Karls University Heidelberg, Zentrum Astron, Astron Rech Inst
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  • R. J. Siverd, Gemini Observ, NSFs NOIRLab
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  • M. Skarka, Czech Acad Sci, Czech Academy of Sciences, Astronomical Institute of the Czech Academy of Sciences, Astron Inst
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  • R. Smolec, Polish Acad Sci, Polish Academy of Sciences, Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences, Nicolaus Copernicus Astron Ctr
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  • A. Sodor, Eotvos Lorand Res Network ELKH, Hungarian Academy of Sciences, Hungarian Research Centre for Astronomy & Earth Sciences, Res Ctr Astron & Earth Sci, Konkoly Observ
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  • S. Sylla, Univ Cheikh Anta Diop Dakar Fann, University Cheikh Anta Diop Dakar
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  • P. Szabo, Univ Cambridge, University of Cambridge, Magdalene Coll
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  • R. Szabo, Eotvos Lorand Univ, Eotvos Lorand University, Inst Phys
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  • H. Kjeldsen
  • J. Christensen-Dalsgaard
  • G. R. Ricker, MIT, Massachusetts Institute of Technology (MIT), Kavli Inst Astrophys & Space Res

The Transiting Exoplanet Survey Satellite (TESS) space telescope is collecting continuous, high-precision optical photometry of stars throughout the sky, including thousands of RR Lyrae stars. In this paper, we present results for an initial sample of 118 nearby RR Lyrae stars observed in TESS Sectors 1 and 2. We use differential image photometry to generate light curves and analyze their mode content and modulation properties. We combine accurate light-curve parameters from TESS with parallax and color information from the Gaia mission to create a comprehensive classification scheme. We build a clean sample, preserving RR Lyrae stars with unusual light-curve shapes, while separating other types of pulsating stars. We find that a large fraction of RR Lyrae stars exhibit various low-amplitude modes, but the distribution of those modes is markedly different from those of the bulge stars. This suggests that differences in physical parameters have an observable effect on the excitation of extra modes, potentially offering a way to uncover the origins of these signals. However, mode identification is hindered by uncertainties when identifying the true pulsation frequencies of the extra modes. We compare mode amplitude ratios in classical double-mode stars to stars with extra modes at low amplitudes and find that they separate into two distinct groups. Finally, we find a high percentage of modulated stars among the fundamental mode pulsators, but also find that at least 28% of them do not exhibit modulation, confirming that a significant fraction of stars lack the Blazhko effect.

OriginalsprogEngelsk
Artikelnummer8
TidsskriftAstrophysical Journal
Vol/bind258
Nummer1
Antal sider44
ISSN0067-0049
DOI
StatusUdgivet - jan. 2022

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