Letter | Published:

No IR burst from the X-ray rapid burster MXB1730–335

Nature volume 286, pages 688689 (14 August 1980) | Download Citation



The X-ray rapid burster MXB1730–335, discovered by Lewin et al.1 has been identified with a compact globular cluster embedded in the midst of the galactic plane and named2 Liller 1. It has an extremely large interstellar extinction (Av = 11 mag) from which Liller2 and Kleinmann et al.4 derived its distance as 10 kpc. Kulkarni et al.3 detected IR bursts in the globular cluster, six times during their 2.5 h observing time on 4–5 April 1979 using a 1-m telescope at Kavalur3. The burst power emitted in H-band was estimated to be 1.6–2.3 × 1030 W. Stimulated by this report, we monitored MXB1730 – 335 using a multi-band IR photometer for about 10 h during April and August 1979. In the latter period, although the X-ray bursts were very active, no coincident IR and X-ray burst could be detected. We show here that this conflicts with previous results by Kulkarni et al.3 and Jones et al.5.

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  1. Department of Physics, Kyoto University, Kyoto 606, Japan

    • S. Sato
    • , K. Kawara
    • , Y. Kobayashi
    • , T. Maihara
    •  & H. Okuda
  2. Tokyo Astronomical Observatory, Mitaka, Tokyo 181, Japan

    • J. Jugaku


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