Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2534h&link_type=abstract
Chandra proposal ID #10200496
Astronomy and Astrophysics
Astrophysics
Scientific paper
We propose to obtain a 10ks ACIS image and spectrum of Adara (epsilon CMa) to characterize an unusual and unexplained spatially extended emission feature in this astrophysically important object. This supposedly non-variable B2 II star shows extended emission in the LETGS zero order and in the spatial dimension of the dispersed spectrum. The LETGS spectrum shows an unusual and broad (10 A) excess centered on 30 A (0.4 keV). The spectral excess was not present in XMM/RGS spectra taken 5 years earlier. Since Adara is noted for its absence of variability, its very low line-of-sight column density, and high EUV flux, it is considered to be a standard for B2 supergiant atmospheric and wind studies. Something has changed. ACIS data are necessary to understand this unprecedented feature.
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