THE BLAZHKO EFFECT and ADDITIONAL EXCITED MODES in RR LYRAE STARS

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Recent photometric space missions, such as CoRoT and Kepler, revealed that many RR Lyrae stars pulsate - beyond their main radial pulsation mode - in low-amplitude modes. Space data seem to indicate a clear trend that, namely, overtone (RRc) stars and modulated fundamental (RRab) RR Lyrae stars ubiquitously show additional modes, while non-Blazhko RRab stars never do. Two Kepler stars (V350 Lyr and KIC 7021124), however, apparently seemed to break this rule: they were classified as non-Blazhko RRab stars showing additional modes. We processed Kepler pixel photometric data of these stars. We detected a small amplitude (but significant) Blazhko effect for both stars by using the resulting light curves and O-C diagrams. This finding strengthens the apparent connection between the Blazhko effect and the excitation of additional modes. In addition, it yields a potential tool for detecting Blazhko stars through the additional frequency patterns, even if we have only short but accurate time series observations. V350 Lyr shows the smallest amplitude multiperiodic Blazhko effect ever detected.

Original languageEnglish
Article numberL19
JournalAstrophysical Journal Letters
Volume809
Issue number2
DOIs
Publication statusPublished - Aug 20 2015

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stars
pixel
diagram
time series
effect
space missions
light curve
pixels
diagrams
trends
harmonics
excitation
trend

Keywords

  • space vehicles
  • stars: oscillations
  • stars: variables: RR Lyrae
  • techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

THE BLAZHKO EFFECT and ADDITIONAL EXCITED MODES in RR LYRAE STARS. / Benkö, J. M.; Szabó, R.

In: Astrophysical Journal Letters, Vol. 809, No. 2, L19, 20.08.2015.

Research output: Contribution to journalArticle

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