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

doi:10.3847/2041-8213/ac1202

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

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

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Abstract

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 language	English
Article number	L12
Journal	Astrophysical Journal Letters
Volume	916
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/ac1202
State	Published - Aug 1 2021

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ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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abstract = "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.",

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AB - 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.

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

Abstract

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