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مقالۀ پژوهشی: حل تحلیلی معادله حاکم بر نوسانات ستارگان تپنده Ap تحت اثر دوران | ||
| فیزیک کاربردی ایران | ||
| دوره 14، شماره 4 - شماره پیاپی 39، دی 1403، صفحه 86-99 اصل مقاله (1.88 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22051/ijap.2024.47591.1416 | ||
| نویسنده | ||
| فاطمه عزیزی* | ||
| استادیار، گروه فیزیک، دانشگاه پیام نور، تهران، ایران | ||
| چکیده | ||
| ستارگان نوسان کننده سریع نوع ویژهای از ستارگان متغییر هستند که در حال تعادل هیدرواستاتیکی نیستند و دوره تپش آنها درمقایسه با سایر ستارگان این گروه بسیار کوتاه و از مرتبهی کمتر از یک ساعت است. این ستارگان دارای نوع طیفی A هستند و در طیفشان خطوط مربوط به عناصر نادرخاکی به صورت فزایندهای مشاهده میشوند و به همین خاطر به ستارگان معروف هستند. در این پژوهش، معادله حرکت ستاره نوسانکننده سریع در حضور یک دوران آرام و یکنواخت به کمک روش اختلالی حل شد و مشخص گردید که تحت اثر دوران سامانه ستارهای، مُدها بین خودشان کوپله میشوند. در حقیقت، هر مُد با مشخص در اثر دوران ستاره به مُد جداسازیشده که هر یک از این مُدها مربوط به یک مقدار ویژهای m نمیباشد، بلکه هر مُد تحت اختلال، متشکل از ترکیب خطی مُد غیراختلالی میباشد. | ||
| کلیدواژهها | ||
| ستارگان تپنده؛ نوسان ستاره ای؛ روش اختلالی؛ کوپلاژ | ||
| عنوان مقاله [English] | ||
| Research Paper: Analytical Solution of the Equation Related to the Oscillations of Ap Pulsating Stars Under the Effect of Rotation | ||
| نویسندگان [English] | ||
| Fatemeh Azizi | ||
| Department of Physics, Payame Noor University, Tehran, Iran | ||
| چکیده [English] | ||
| Rapidly oscillating Ap stars are a special type of variable stars that are not in hydrostatic equilibrium. Their pulsation period is very short compared to other stars of this group and is less than one hour. These stars have spectral type A and lines related to rare-earth elements are increasingly observed in their spectrum, so they are known as Ap stars. In this research, the equation of motion of the rapidly oscillating Ap star was solved using the perturbation method in the presence of a smooth and uniform rotation and it was determined that under the effect of rotation in the stellar system, the modes are coupled among themselves. Each mode with a specific l is separated into 2l+1 modes due to rotation, and each of these modes under disturbance does not correspond to a specific value of m, but each mode under perturbation consists of a linear combination of m=2l+1modes. | ||
| کلیدواژهها [English] | ||
| Perturbation Method, Stellar Oscillation, Pulsating Stars, Coupling | ||
| مراجع | ||
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[1] Elkin, V.G., Mathys, G., Kurtz, D.W., Hubrig, S. and Freyhammer, L.M., "A rival for Babcock's star: the extreme 30-kG variable magnetic field in the Ap star HD 75049", Monthly Notices of the Royal Astronomical Society, 402(3), 1883-1891, 2010. https://doi.org/10.1111/j.1365-2966.2009.16015.x [2] Babcock, H. W., 1958, "Stellar magnetic fields", Proceedings from IAU Symposium no. 6, Cambridge University Press, p.16. http://adsabs.harvard.edu/abs/1958IAUS....6..161B [3] Kurtz, D.W., "12.15 Minute Light Variations in Przybylski's Star, HD 101065", Information Bulletin on Variable Stars, 1436,# 1. 1436, 1978. https://articles.adsabs.harvard.edu/pdf/1978IBVS.1436....1K [4] Martinez, P., and Kurtz, D. W., "The Cape rapidly oscillating Ap star survey. II. Discovery of another six new roAp stars", Mon. Not. R. Astron. Soc., 271, 118–128, 1994a. https://doi.org/10.1093/mnras/271.1.118 [5] Kochukhov, O., Alentiev, D., Ryabchikova, T., Boyko, S., Cunha, M., Tsymbal, V. and Weiss, W., "Discovery of new roAp pulsators in the UVES survey of cool magnetic Ap stars", arXiv preprint arXiv:1302.6585, 2013. https://doi.org/10.1093/mnras/stt377 [6] Holdsworth, D.L., Smalley, B., Gillon, M., Clubb, K.I., Southworth, J., Maxted, P.F.L., Anderson, D.R., Barros, S.C.C., Cameron, A.C., Delrez, L. and Faedi, F., "High-frequency A-type pulsators discovered using SuperWASP", Monthly Notices of the Royal Astronomical Society, 439(2), 2078-2095, 2014. https://doi.org/10.1093/mnras/stu094 [7] Joshi, S., Martinez, P., Chowdhury, S., Chakradhari, N.K., Joshi, Y.C., van Heerden, P., Medupe, T., Kumar, Y.B. and Kuhn, R.B., "The Nainital-Cape Survey-IV", arXiv preprint arXiv:1603.03517, 2016. https://doi.org/10.1051/0004-6361/201527242 [8] Cunha, M.S., Antoci, V., Holdsworth, D.L., Kurtz, D.W., Balona, L.A., Bognár, Z., Bowman, D.M., Guo, Z., Kołaczek-Szymański, P.A., Lares-Martiz, M. and Paunzen, E., , "Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2", Monthly Notices of the Royal Astronomical Society 487(3), 3523-3549, 2019. https://doi.org/10.1093/mnras/stz1332 [9] Hey, D. R., Holdsworth, D. L., Bedding, T. R., Murphy, S. J., Cunha, M. S., Kurtz, D. W., et al., , "Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology", Mon. Not. R. Astron. Soc., 488, 18–36, 2019. https://doi.org/10.1093/mnras/stz1633 [10] Alentiev, D., Kochukhov, O., Ryabchikova, T., Cunha, M., Tsymbal, V. and Weiss, W., "Discovery of the longest period rapidly oscillating Ap star HD 177765", Monthly Notices of the Royal Astronomical Society: Letters, 421(1), L82-L86, 2012. https://doi.org/10.1111/j.1745-3933.2011.01211.x [11] Kurtz, D.W. and Seeman, J., "Frequency analysis of the rapidly oscillating Ap star HR 1217 (HD 24712)", Monthly Notices of the Royal Astronomical Society, 205(1), 11-22, 1983. https://doi.org/10.1093/mnras/205.1.11 [12] Kurtz, D.W., "Rapidly oscillating Ap stars." IN: Annual review of astronomy and astrophysics. Vol. 28 (A91-28201 10-90). Palo Alto, CA, Annual Reviews, Inc., 28, 607-655, 1990. https://doi.org/10.1146/annurev.aa.28.090190.003135 [13] Gray, R. O., and Corbally, C. J., Stellar Spectral Classification. Princeton, NJ: Princeton University Press, 2009. https://press.princeton.edu/books/paperback/9780691125114/stellar-spectral-classification [14] Lüftinger, T., Kochukhov, O., Ryabchikova, T., Piskunov, N., Weiss, W. W., and Ilyin, I., "Magnetic Doppler imaging of the roAp star HD 24712", Astron. Astrophys., 509:A71, 2010. https://doi.org/10.1051/0004-6361/200811545 [15] Vauclair, S., Dolez, N., "Pulsations and chemical composition of main sequence magnetic stars", In Progress of Seismology of the Sun and Stars: Proceedings of the Oji International Seminar Held at Hakone, Japan, 11–14 December 1989, 399-403. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. https://doi.org/10.1007/3-540-53091-6_106 [16] Holdsworth, D. L., "The roAp Stars Observed by the Kepler Space Telescope", Frontiers in Astronomy and Space Sciences, 8, 626398, 2021. https://doi.org/10.3389/fspas.2021.626398 [17] Shibahashi, H., "Magnetic overstability as exitation Mechanism of the rapid oscillations of Ap stars", the Astrophysical journal, 275, L5-L9, 1983. https://ui.adsabs.harvard.edu/link_gateway/1983ApJ...275L...5S/doi:10.1086/184160 [18] Sakurai, J. J., Jim, Napolitano, "Modern Quantum Mechanics, second edition", Addison Wesley publishing, 303-310, 1994. https://kgut.ac.ir/useruploads/1505647831850hcd.pdf | ||
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