تقرير
Solar cycle variation of $\nu_{\rm max}$ in helioseismic data and its implications for asteroseismology
| العنوان: | Solar cycle variation of $\nu_{\rm max}$ in helioseismic data and its implications for asteroseismology |
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| المؤلفون: | Howe, Rachel, Chaplin, William J., Basu, Sarbani, Ball, Warrick H., Davies, Guy R., Elsworth, Yvonne, Hale, Steven J., Miglio, Andrea, Nielsen, Martin Bo, Viani, Lucas S. |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | The frequency, $\nu_{\rm max}$, at which the envelope of pulsation power peaks for solar-like oscillators is an important quantity in asteroseismology. We measure $\nu_{\rm max}$ for the Sun using 25 years of Sun-as-a-Star Doppler velocity observations with the Birmingham Solar-Oscillations Network (BiSON), by fitting a simple model to binned power spectra of the data. We also apply the fit to Sun-as-a-Star Doppler velocity data from GONG and GOLF, and photometry data from VIRGO/SPM on the ESA/NASA SOHO spacecraft. We discover a weak but nevertheless significant positive correlation of the solar $\nu_{\rm max}$ with solar activity. The uncovered shift between low and high activity, of $\simeq 25\,\rm \mu Hz$, translates to an uncertainty of 0.8 per cent in radius and 2.4 per cent in mass, based on direct use of asteroseismic scaling relations calibrated to the Sun. The mean $\nu_{\rm max}$ in the different datasets is also clearly offset in frequency. Our results flag the need for caution when using $\nu_{\rm max}$ in asteroseismology. Comment: 6 pages, 4 figures, published in MNRAS Letters, 2020, vol 493, pages L49 - 53 Corrected error in metadata list of authors |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnrasl/slaa006 |
| URL الوصول: | http://arxiv.org/abs/2001.10949 |
| رقم الأكسشن: | edsarx.2001.10949 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnrasl/slaa006 |
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