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A Theoretical Light‐Curve Model for the 1999 Outburst of U Scorpii

  • Authors: Izumi Hachisu, Mariko Kato, Taichi Kato, and Katsura Matsumoto

Hachisu et al. 2000 The Astrophysical Journal Letters 528 L97.

  • Provider: AAS Journals

Caption: Fig. 2.

Theoretical light curve (solid line) plotted against time (HJD 2,451,000+), together with the observational points (the filled circles represent data taken from K. Matsumoto & T. Kato [1999, in preparation], the open circles from the VS‐NET archives), for 1.37 M WD + 1.5 M MS with an inclination angle ﹩i=80^{\circ }﹩. The brightnesses of the WD photosphere (dotted line) and of the accretion disk surface (dashed line) are also added. The distance to U Sco is estimated to be 5.4–8.0 kpc for no absorption (﹩A_{V}=0﹩) but 4.1–6.1 kpc for ﹩A_{V}=0.6﹩. U Sco was detected by BeppoSAX as a supersoft X‐ray source (SSS) 19–20 days after maximum (Kahabka et al. 1999). The capital letters "S" and "P" mean the secondary minimum and the primary minimum, respectively, in the eclipses observed by K. Matsumoto & T. Kato (1999, in preparation).

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