دورية أكاديمية

Constraining the Evolution of Zz Ceti

التفاصيل البيبلوغرافية
العنوان: Constraining the Evolution of Zz Ceti
المؤلفون: Mukadam, Anjum S., Kepler, S. O., Nather, D. E., Kilic, M., Mullally, F., von Hippel, T., Kleinman, S. J., Nitta, A., Guzik, J. A., Bradley, P. A., Matthews, J., Sekiguchi, K., Sullivan, D. J., Sullivan, T., Shobbrook, R. R., Birch, P., Jiang, X. J., Xu, D. W., Joshi, S., Ashoka, B. N., Ibbetson, P., Leibowitz, E., Ofek, E. O., Meištas, E. G., Janulis, R., Ališauskas, R. D., Kalytis, R., Handler, G., Kilkenny, D., O'Donoghue, D., Kurtz, D. W., Müller, M., Moskalik, P., Ogloza, W., Zola, S., Krzesiński, J., Johnannessen, F., Gonzalez-Perez, J. M., Solheim, J. E., Silvotti, R., Bernabei, S., Vauclair, G., Dolez, N., Fu, J. N., Chevreton, M., Manteiga, M., Suárez, O., Ulla, A., Cunha, M. S., Metcalfe, T. S., Kanaan, A., Fraga, L., Costa, A. F. M., Giovannini, O., Fontaine, G., Bergeron, P., O'Brien, M. S., Sanwal, D., Wood, M. A., Ahrens, T. J., Silvestri, N., Klumpe, E. W., Kawaler, S. D., Riddle, R., Reed, M. D., Watson, T. K.
المساهمون: 1777676
المصدر: Publications
بيانات النشر: Scholarly Commons
سنة النشر: 2003
المجموعة: Embry-Riddle Aeronautical University: ERAU Scholarly Commons
مصطلحات موضوعية: stars: evolution, stars: individual (ZZ Ceti, R548), stars: oscillations, stars: variables: other, white dwarfs, Stars, Interstellar Medium and the Galaxy
الوصف: We report our analysis of the stability of pulsation periods in the DAV star (pulsating hydrogen atmosphere white dwarf) ZZ Ceti, also called R548. On the basis of observations that span 31 years, we conclude that the period 213.13 s observed in ZZ Ceti drifts at a rate dP/dt ≤ (5:5 ± 1:9) x 10-15 s s-1, after correcting for proper motion. Our results are consistent with previous Ṗ values for this mode and an improvement over them because of the larger time base. The characteristic stability timescale implied for the pulsation period is ⎸P / Ṗ ⎸=⎹≥ 1:2 Gyr, comparable to the theoretical cooling timescale for the star. Our current stability limit for the period 213.13 s is only slightly less than the present measurement for another DAV, G117-B15A, for the period 215.2 s, establishing this mode in ZZ Ceti as the second most stable optical clock known, comparable to atomic clocks and more stable than most pulsars. Constraining the cooling rate of ZZ Ceti aids theoretical evolutionary models and white dwarf cosmochronology. The drift rate of this clock is small enough that we can set interesting limits on reflex motion due to planetary companions.
نوع الوثيقة: text
وصف الملف: application/pdf
اللغة: unknown
العلاقة: https://commons.erau.edu/publication/230Test; https://commons.erau.edu/context/publication/article/1272/viewcontent/CONSTRAINING_THE_EVOLUTION___Ted_von_Hippel.pdfTest
الإتاحة: https://commons.erau.edu/publication/230Test
https://commons.erau.edu/context/publication/article/1272/viewcontent/CONSTRAINING_THE_EVOLUTION___Ted_von_Hippel.pdfTest
رقم الانضمام: edsbas.5BFA64F3
قاعدة البيانات: BASE