SIMBAD references

1999MNRAS.304...47G - Mon. Not. R. Astron. Soc., 304, 47-51 (1999/March-3)

The optical counterpart of SAX J1808.4-3658, the transient bursting millisecond X-ray pulsar.


Abstract (from CDS):

A set of CCD images have been obtained during the decline of the X-ray transient SAX J1808.4 - 3658 during 1998 April–June. The optical counterpart has been confirmed by several pieces of evidence. The optical flux shows a modulation on several nights that is consistent with the established X-ray binary orbit period of 2 h. This optical variability is roughly in antiphase with the weak X-ray modulation. The source mean magnitude of V=16.7 on April 18 declined rapidly after April 22. From May 2 onwards the magnitude was more constant at around V=18.45 but by June 27 it was below our sensitivity limit. The optical decline precedes the rapid second phase of the X-ray decrease by 3±1 d. The source has been identified on a 1974 UK Schmidt plate at an estimated magnitude of ∼ 20. The nature of the optical companion is discussed.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): binaries: close - stars: neutron - pulsars: individual: SAX J1808.4-3658 - X-rays: stars

Simbad objects: 5

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