The Changing Lightcurve of the Double-mode RR Lyrae Variable Star V338 Boo

Kenneth Carrell, Ronald Wilhelm, Faith Olsen, Andrew Tom, Garath Vetters, Anna McElhannon

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We present an analysis of the lightcurve extracted from Transiting Exoplanet Survey Satellite (TESS) Full Frame Images (FFIs) of the double-mode RR Lyrae V338 Boo. We find that the fundamental mode pulsation is changing in amplitude across the 54 days of observations. The first overtone mode pulsation also changes, but on a much smaller scale. Harmonics and combinations of the primary pulsation modes also exhibit unusual behavior. Possible connections with other changes in RR Lyrae pulsations are discussed, but a full understanding of the cause of the changes seen in V338 Boo should shed light on some of the most difficult and unanswered questions in stellar pulsation theory, and astrophysics more generally.

Original languageEnglish
Article numberL12
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Aug 1 2021

Bibliographical note

Publisher Copyright:
© 2021. The American Astronomical Society. All rights reserved.

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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