The occurrence of non-pulsating stars in the γ Dor and δ Sct pulsation instability regions: results fromKeplerquarter 14–17 data
| Autor: | Joanna Molenda-Zakowicz, K. Uytterhoeven, Joyce A. Guzik, Karen Kinemuchi, Jason Jackiewicz, Paul A. Bradley |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Astronomy Astrophysics::Cosmology and Extragalactic Astrophysics General Medicine Astrophysics Stellar classification Stars Photometry (astronomy) Amplitude Magnitude (astronomy) Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Variable star Astrophysics::Galaxy Astrophysics Stellar pulsation Superflare |
| Zdroj: | Astronomical Review. 11:1-24 |
| ISSN: | 2167-2865 2167-2857 |
| DOI: | 10.1080/21672857.2015.1023120 |
| Popis: | The high precision long time-series photometry of the NASA Kepler spacecraft provides an excellent means to discover and characterize variability in main-sequence stars, and to make progress in interpreting the pulsations to derive stellar interior structure and test stellar models. For stars of spectral types A–F, the Kepler data revealed a number of surprises, such as more hybrid pulsating Sct and Dor pulsators than expected, pulsators lying outside of the instability regions predicted by theory, and stars that were expected to pulsate, but showed no variability. In our 2013 Astronomical Review article, we discussed the statistics of variability for 633 faint (Kepler magnitude 14–16) spectral type A–F stars observed by Kepler during Quarters 6–13 (June 2010–June 2012). We found six stars that showed no variability with amplitude 20 ppm or greater in the range 0.2–24.4 cycles/day, but whose positions in the log diagram place them in the Sct or Dor pulsation instability regions established from pre-Kepler... |
| Databáze: | OpenAIRE |
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