The complex case of V445 Lyr observed with Kepler: Two Blazhko modulations, a non-radial mode, possible triple mode RR Lyrae pulsation, and more

E. Guggenberger, K. Kolenberg, J. M. Nemec, R. Smolec, J. Benkő, C. C. Ngeow, J. G. Cohen, B. Sesar, R. Szabó, M. Catelan, P. Moskalik, K. Kinemuchi, S. E. Seader, J. C. Smith, P. Tenenbaum, H. Kjeldsen

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =-2.0 dex from spectroscopy, allowed us to constrain the mass (0.55-0.65 M ) and luminosity (40-50 L ) of V445 Lyr through theoretical Petersen diagrams. A non-radial mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O - C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.

Original languageEnglish
Pages (from-to)649-665
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume424
Issue number1
DOIs
Publication statusPublished - Jul 2012

Fingerprint

satellite data
modulation
stars
harmonics
diagram
spectroscopy
cycles
period doubling
Fourier analysis
space missions
metallicity
frequency ranges
diagrams
luminosity
analysis
effect
causes
estimates

Keywords

  • Asteroseismology
  • Methods: data analysis
  • Stars: individual: CoRoT 105288363
  • Stars: individual: KIC 6186029 (V445 Lyr)
  • Stars: variables: RR Lyrae
  • Techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The complex case of V445 Lyr observed with Kepler : Two Blazhko modulations, a non-radial mode, possible triple mode RR Lyrae pulsation, and more. / Guggenberger, E.; Kolenberg, K.; Nemec, J. M.; Smolec, R.; Benkő, J.; Ngeow, C. C.; Cohen, J. G.; Sesar, B.; Szabó, R.; Catelan, M.; Moskalik, P.; Kinemuchi, K.; Seader, S. E.; Smith, J. C.; Tenenbaum, P.; Kjeldsen, H.

In: Monthly Notices of the Royal Astronomical Society, Vol. 424, No. 1, 07.2012, p. 649-665.

Research output: Contribution to journalArticle

Guggenberger, E, Kolenberg, K, Nemec, JM, Smolec, R, Benkő, J, Ngeow, CC, Cohen, JG, Sesar, B, Szabó, R, Catelan, M, Moskalik, P, Kinemuchi, K, Seader, SE, Smith, JC, Tenenbaum, P & Kjeldsen, H 2012, 'The complex case of V445 Lyr observed with Kepler: Two Blazhko modulations, a non-radial mode, possible triple mode RR Lyrae pulsation, and more', Monthly Notices of the Royal Astronomical Society, vol. 424, no. 1, pp. 649-665. https://doi.org/10.1111/j.1365-2966.2012.21244.x
Guggenberger, E. ; Kolenberg, K. ; Nemec, J. M. ; Smolec, R. ; Benkő, J. ; Ngeow, C. C. ; Cohen, J. G. ; Sesar, B. ; Szabó, R. ; Catelan, M. ; Moskalik, P. ; Kinemuchi, K. ; Seader, S. E. ; Smith, J. C. ; Tenenbaum, P. ; Kjeldsen, H. / The complex case of V445 Lyr observed with Kepler : Two Blazhko modulations, a non-radial mode, possible triple mode RR Lyrae pulsation, and more. In: Monthly Notices of the Royal Astronomical Society. 2012 ; Vol. 424, No. 1. pp. 649-665.
@article{a9199ee43e564f2eb965230b0d5bf35b,
title = "The complex case of V445 Lyr observed with Kepler: Two Blazhko modulations, a non-radial mode, possible triple mode RR Lyrae pulsation, and more",
abstract = "Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =-2.0 dex from spectroscopy, allowed us to constrain the mass (0.55-0.65 M ⊙) and luminosity (40-50 L ⊙) of V445 Lyr through theoretical Petersen diagrams. A non-radial mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O - C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.",
keywords = "Asteroseismology, Methods: data analysis, Stars: individual: CoRoT 105288363, Stars: individual: KIC 6186029 (V445 Lyr), Stars: variables: RR Lyrae, Techniques: photometric",
author = "E. Guggenberger and K. Kolenberg and Nemec, {J. M.} and R. Smolec and J. Benkő and Ngeow, {C. C.} and Cohen, {J. G.} and B. Sesar and R. Szab{\'o} and M. Catelan and P. Moskalik and K. Kinemuchi and Seader, {S. E.} and Smith, {J. C.} and P. Tenenbaum and H. Kjeldsen",
year = "2012",
month = "7",
doi = "10.1111/j.1365-2966.2012.21244.x",
language = "English",
volume = "424",
pages = "649--665",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

TY - JOUR

T1 - The complex case of V445 Lyr observed with Kepler

T2 - Two Blazhko modulations, a non-radial mode, possible triple mode RR Lyrae pulsation, and more

AU - Guggenberger, E.

AU - Kolenberg, K.

AU - Nemec, J. M.

AU - Smolec, R.

AU - Benkő, J.

AU - Ngeow, C. C.

AU - Cohen, J. G.

AU - Sesar, B.

AU - Szabó, R.

AU - Catelan, M.

AU - Moskalik, P.

AU - Kinemuchi, K.

AU - Seader, S. E.

AU - Smith, J. C.

AU - Tenenbaum, P.

AU - Kjeldsen, H.

PY - 2012/7

Y1 - 2012/7

N2 - Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =-2.0 dex from spectroscopy, allowed us to constrain the mass (0.55-0.65 M ⊙) and luminosity (40-50 L ⊙) of V445 Lyr through theoretical Petersen diagrams. A non-radial mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O - C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.

AB - Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as have recently been detected in high-precision satellite data, have become a crucial topic in finding an explanation of the long-standing mystery of the Blazhko effect. We present here an analysis of the most extreme case detected so far, the RRab star V445 Lyr (KIC 6186029) which was observed with the Kepler space mission. V445 Lyr shows very strong cycle-to-cycle changes in its Blazhko modulation, which are caused by both a secondary long-term modulation period and irregular variations. In addition to the complex Blazhko modulation, V445 Lyr also shows a rich spectrum of additional peaks in the frequency range between the fundamental pulsation and the first harmonic. Among those peaks, the second radial overtone could be identified, which, combined with a metallicity estimate of [Fe/H] =-2.0 dex from spectroscopy, allowed us to constrain the mass (0.55-0.65 M ⊙) and luminosity (40-50 L ⊙) of V445 Lyr through theoretical Petersen diagrams. A non-radial mode and possibly the first overtone are also excited. Furthermore, V445 Lyr shows signs of the period-doubling phenomenon and a long-term period change. A detailed Fourier analysis along with a study of the O - C variation of V445 Lyr is presented, and the origin of the additional peaks and possible causes of the changes in the Blazhko modulation are discussed. The results are then put into context with those of the only other star with a variable Blazhko effect for which a long enough set of high-precision continuous satellite data has been published so far, the CoRoT star 105288363.

KW - Asteroseismology

KW - Methods: data analysis

KW - Stars: individual: CoRoT 105288363

KW - Stars: individual: KIC 6186029 (V445 Lyr)

KW - Stars: variables: RR Lyrae

KW - Techniques: photometric

UR - http://www.scopus.com/inward/record.url?scp=84863556395&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863556395&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2012.21244.x

DO - 10.1111/j.1365-2966.2012.21244.x

M3 - Article

AN - SCOPUS:84863556395

VL - 424

SP - 649

EP - 665

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -