New features of the X-ray dip source 1755-338

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The X-ray dip source 1755-338 was observed with Ginga and simultaneously with Ginga and ROSAT in 1991. The source was in the "high" luminosity state during the observation in 1990, similar to the EXOSAT observation. Regularly spaced dips and no apparent low-energy absorption during these dips are confirmed. During the observation in 1991, the source was in the "low" luminosity state with the flux (1-37 keV) less than 35% of the "high" state nondip level. The spectrum observed in this "low" state is much harder than that in the "high" state. Also, an iron emission line centered around 6.7 keV is found in the "low" state. The data imply that the accreting matter in this system might have the cosmic abundance, contrary to the earlier suggestion that the heavy-element abundances in 1755-338 are extremely low. The equivalent neutral hydrogen column density is ∼4 × 1021 cm-2 in the low state, as deduced from the combined data of ROSAT and Ginga.

Original languageEnglish
Pages (from-to)463-471
Number of pages9
JournalAstrophysical Journal
Volume454
Issue number1
Publication statusPublished - 1995 Nov 20
Externally publishedYes

Fingerprint

dip
luminosity
x rays
energy absorption
heavy elements
suggestion
hydrogen
iron
energy

Keywords

  • Binaries: close
  • Stars: individual (1755 - 338)
  • X-rays: stars

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Seon, K. I., Min, K. W., Yoshida, K., Makino, F., Van Der Klis, M., Van Paradijs, J., & Lewin, W. H. G. (1995). New features of the X-ray dip source 1755-338. Astrophysical Journal, 454(1), 463-471.

New features of the X-ray dip source 1755-338. / Seon, Kwang Il; Min, Kyoung Wook; Yoshida, Kenji; Makino, Fumiyoshi; Van Der Klis, Michiel; Van Paradijs, Jan; Lewin, Walter H G.

In: Astrophysical Journal, Vol. 454, No. 1, 20.11.1995, p. 463-471.

Research output: Contribution to journalArticle

Seon, KI, Min, KW, Yoshida, K, Makino, F, Van Der Klis, M, Van Paradijs, J & Lewin, WHG 1995, 'New features of the X-ray dip source 1755-338', Astrophysical Journal, vol. 454, no. 1, pp. 463-471.
Seon KI, Min KW, Yoshida K, Makino F, Van Der Klis M, Van Paradijs J et al. New features of the X-ray dip source 1755-338. Astrophysical Journal. 1995 Nov 20;454(1):463-471.
Seon, Kwang Il ; Min, Kyoung Wook ; Yoshida, Kenji ; Makino, Fumiyoshi ; Van Der Klis, Michiel ; Van Paradijs, Jan ; Lewin, Walter H G. / New features of the X-ray dip source 1755-338. In: Astrophysical Journal. 1995 ; Vol. 454, No. 1. pp. 463-471.
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AB - The X-ray dip source 1755-338 was observed with Ginga and simultaneously with Ginga and ROSAT in 1991. The source was in the "high" luminosity state during the observation in 1990, similar to the EXOSAT observation. Regularly spaced dips and no apparent low-energy absorption during these dips are confirmed. During the observation in 1991, the source was in the "low" luminosity state with the flux (1-37 keV) less than 35% of the "high" state nondip level. The spectrum observed in this "low" state is much harder than that in the "high" state. Also, an iron emission line centered around 6.7 keV is found in the "low" state. The data imply that the accreting matter in this system might have the cosmic abundance, contrary to the earlier suggestion that the heavy-element abundances in 1755-338 are extremely low. The equivalent neutral hydrogen column density is ∼4 × 1021 cm-2 in the low state, as deduced from the combined data of ROSAT and Ginga.

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