THE NOISE IN THE 35-D CYCLE OF HER X-1


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BAYKAL A. , BOYNTON P., DEETER J., SCOTT D.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.265, ss.347-350, 1993 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 265 Konu: 2
  • Basım Tarihi: 1993
  • Doi Numarası: 10.1093/mnras/265.2.347
  • Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Sayfa Sayıları: ss.347-350

Özet

We calculate the power density spectrum of fluctuations in the X-ray turn-on times of Her X-1, including new data which extend the X-ray and optical flux observations to a span of over 20 yr with 221 distinct 35-d high-low flux cycles. If we assume that turn-on times define the period of the 35-d clock, this statistical interpretation of turn-on behaviour is consistent with a white-noise process in the first derivative of the 35-d phase fluctuations (or a random walk in clock phase). We discuss the implications of considering the 35-d clock mechanism as a noise process.