Unprecedentedly rapid rotational braking of the He-strong CP star HD 37776

  • Z. Mikulasek Institute of Theoretical Physics and Astrophysics, Masaryk University, CZ-611 37, Brno, Czech Republic; Observatory and Planetarium of J. Palisa, VSB – Technical University, Ostrava, Czech Republic
  • J. Krticka Institute of Theoretical Physics and Astrophysics, Masaryk University, CZ-611 37, Brno, Czech Republic
  • G.W. Henry Center of Excellence in Information Systems, Tennessee State University, Nashville, Tennessee, USA
  • J. Zverko Astronomical Institute, Slovak Academy of Sciences, Tatranska Lomnica, Slovak Republic
  • J. Ziznovský Astronomical Institute, Slovak Academy of Sciences, Tatranska Lomnica, Slovak Republic
  • J. Janik Institute of Theoretical Physics and Astrophysics, Masaryk University, CZ-611 37, Brno, Czech Republic
  • T. Graf Observatory and Planetarium of J. Palisa, VSB – Technical University, Ostrava, Czech Republic

Аннотация

We study long-term light variations in the well-known He-strong CP star HD 37776 = V901 Ori to search for changes in its photometric period. We analyze all published reliable photometric observations of this star, including 861uvbyβ, BV, V and Hp measurements. These observations are supplemented by 506 new BV observations obtained during the last two observing seasons. All the observations are treated simultaneously in our analysis.

We confirm a previously suspected lengthening of the photometric period in HD 37776 and measure the rate of increase to be 52.4 ± 2.1 s per century (!). We interpret this ongoing period increase to be the slowing of the star's surface rotation, most likely due to momentum loss through a magnetically confined stellar wind.

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Опубликован
2008-05-01
Как цитировать
Mikulasek Z., Krticka J., Henry G., и др., 2008. Известия Крымской астрофизической обсерватории, Т. 104, № 2, С. 221a-221a. Доступно на: https://jn.craocrimea.ru/index.php/izvcrao/article/view/701 (Дата доступа: 30сентябрь2022)
Раздел
Материалы конференции