The Changing Lightcurve of the Double-Mode RR Lyrae Variable Star V338 Boo
| Autor: | Anna McElhannon, Kenneth Carrell, Andrew Tom, Faith Olsen, Garath Vetters, Ronald Wilhelm |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Overtone Astrophysics::High Energy Astrophysical Phenomena Mode (statistics) FOS: Physical sciences Astronomy and Astrophysics Astrophysics RR Lyrae variable Exoplanet Amplitude Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Primary (astronomy) Harmonics Astrophysics::Solar and Stellar Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Stellar pulsation |
| Popis: | We present an analysis of the lightcurve extracted from Transiting Exoplanet Survey Satellite Full Frame Images 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. 8 pages, 4 figures, accepted to The Astrophysical Journal Letters |
| Databáze: | OpenAIRE |
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