Propeller‐driven Spectral State Transition in the Low‐Mass X‐Ray Binary 4U 1608−52 | Zendy

Chen Xie | Zendy; ShuangNan Zhang | Zendy; Guo Qiang Ding | Zendy

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Propeller‐driven Spectral State Transition in the Low‐Mass X‐Ray Binary 4U 1608−52

Author(s) -

Chen Xie,

ShuangNan Zhang,

Guo Qiang Ding

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/506338

Subject(s) - neutron star , physics , astrophysics , x ray binary , binary number , propeller , luminosity , black hole (networking) , x ray burster , accretion (finance) , low mass , stellar evolution , galaxy , stars , arithmetic , mathematics , marine engineering , engineering , computer network , routing protocol , routing (electronic design automation) , computer science , link state routing protocol , stellar mass loss

Spectral state transitions in neutron star LMXB systems have been widelyobserved yet not well understood. Here we report an abrupt spectral change in4U 1608-52, a typical atoll source, during its decay phase of the 2004outburst. The source is found to undergo sudden changes in its spectralhardness and other properties. The transition occurred when its luminosity isbetween (3.3-5.3) E36 ergs/s, assuming a distance of 3.6 kpc. Interpreting thisevent in terms of the propeller effect, we infer the neutron star surfacemagnetic field as (1.4-1.8) E8 Gauss. We also briefly discuss similarities anddifferences between the spectral states of neutron star and black hole binarysystems.Comment: 13 pages, 3 figures, accepted by Astrophysical Journa

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