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The Variability Of RSG : HV2576

Published online by Cambridge University Press:  01 April 2008

Ming Yang  and
B. W. Jiang
Ming Yang
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing, 100875, China email: myang@mail.bnu.edu.cn and bjiang@bnu.edu.cn
B. W. Jiang
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing, 100875, China email: myang@mail.bnu.edu.cn and bjiang@bnu.edu.cn
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Abstract

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The Harvard Variable HV2576, as a red supergiant in the Large Magallanic Cloud, has a complex light variation, which is not explained well. The existing one-period non-linear pulsation model deviated clearly from its light curve. We tried to fit the light curve by a superposition of several harmonic pulsations. By using the PDM, PERIOD04 and SparSpec codes to analyze the light variation, two periods with 525 and 261 days are well established. Furthermore, the 261-day period is found to change according to the wavelet analysis. In addition, the noise obeying the 1/f law. Based on all these facts, we suggest that the light variation of HV2576 may be due to huge convection cells that interplay with oscillation or the third very long period.

Keywords

stars: oscillationsstars: supergiantsstars: variables: other
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 267 - 268
Copyright
Copyright © International Astronomical Union 2008

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