Results of Ginga/ROSAT simultaneous observation of the X-ray burst source 1735-444

Kwang Il Seon, Kyoung Wook Min, Kenji Yoshida, Fumiyoshi Makino, Walter H.G. Lewin, Michiel Van Der Klis, Jan Van Paradijs

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Abstract

We present a detailed analysis of simultaneous Ginga and ROSAT observations of the X-ray burst source 1735-444, during which the source was in an unusually high luminosity state. The source shows the characteristics of an atoll source in the high-intensity (banana) state, with a general correlation between intensity and spectral hardness. A blackbody component contributes ∼15%-20% of the total flux when the conventional two-component model is used to fit the spectra. We also observed a bright burst with radius expansion at this very high luminosity. The burst spectrum could not be described by a simple blackbody model. We discuss possible explanations.

Original languageEnglish
Pages (from-to)398-407
Number of pages10
JournalAstrophysical Journal
Volume479
Issue number1 PART I
DOIs
Publication statusPublished - 1997 Jan 1

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Keywords

  • Binaries: close
  • Stars: individual (1735-444)
  • X-rays: bursts
  • X-rays: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Seon, K. I., Min, K. W., Yoshida, K., Makino, F., Lewin, W. H. G., Van Der Klis, M., & Van Paradijs, J. (1997). Results of Ginga/ROSAT simultaneous observation of the X-ray burst source 1735-444. Astrophysical Journal, 479(1 PART I), 398-407. https://doi.org/10.1086/303856