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- W2020332820 abstract "We present an 8-13m spectrum of V4334 Sgr (Sakurai's object), which shows clear evidence for the presence of a silicate absorption feature at 9.7m. We argue that the feature is interstellar in origin, and on this basis we determine the interstellar extinction to V4334 Sgr to be E(B V)= 0:66 0:12. This is the only determination of the extinction to V4334 Sgr to date that uses direct observation of the intervening material; as the reddening using this method is refined it will be of importance in determining the distance of V4334 Sgr, and hence in modelling its evolution. grating was used with a 2 pixel (0.76 arcsec) wide slit, giv- ing a resolving power= ' 200. Sakurai's object was ob- served in the standard stare/nod mode, at an average airmass of 1.28. The bright star HR 6378 (assumed to have N = 2:25 and Te = 8800 K) was observed in the same way at a mean airmass of 1.24, for the purposes of flux calibration and remov- ing telluric features. Telluric absorption features provided the wavelength calibration, which is accurate to 0.02m. The reduced 8-13m spectrum of V4334 Sgr is shown in Fig. 1a. An apparent broad absorption feature, centered be- tween 9.5 and 10.0m, resembles the absorption profile of as- tronomical silicates. The spectrum is noisy near the maximum absorption, which coincides with the strongest part of the deep telluric ozone absorption near 9.6m. The airmass mismatch would tend to artificially deepen the feature in the reduced spectrum, but the eect is small compared to the observed fea- ture, because the mismatch was small and because many of the individual ozone lines are saturated. We have made no attempt to correct for the mismatch." @default.
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- W2020332820 date "2002-10-21" @default.
- W2020332820 modified "2023-09-26" @default.
- W2020332820 title "The interstellar extinction to V4334 Sgr (Sakurai's object)" @default.
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- W2020332820 doi "https://doi.org/10.1051/0004-6361:20021229" @default.
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