A calibration of the ROSAT HRI UV leak
T.W. Berghöfer 1,2,
J.H.M.M. Schmitt 1 and
M. Hünsch 3
Astron. Astrophys. 342, L17-L20 (1999)
In the paper "A calibration of the ROSAT HRI UV leak" by Berghöfer, Schmitt & Hünsch (1999, A&A 342, L17) ROSAT HRI UV contamination count rate predictions are reported for the star Betelgeuse. A recent reinvestigation shows that the given numbers are too high, as was also pointed out to us by M. V. Zombeck (private communication). Based on new calculations, including archival IUE low dispersion SWP and LWP spectra and a photospheric model of this star, we compute the following HRI count rate estimates: The logarithmic interpolation of the MCP quantum efficiency between 2500-6000Å provides a count rate of counts s-1, whereas the exponential interpolation leads to a count rate counts s-1 in the 2500-6000Å band. The values for the 1000-6000Å band are counts s-1 (logarithmic MCP interpolation) and counts s-1 (exponential MCP interpolation).
The new HRI count rate predictions are all consistent with the upper limit derived from the ROSAT HRI observation of Betelgeuse.
Send offprint requests to: T.W. Berghöfer
© European Southern Observatory (ESO) 2000
Online publication: May 3, 2000