Galactic FUV Extinction Determined Using FUSE

Details Galactic FUV Extinction Determined Using FUSE Galactic FUV Extinction Determined Using FUSE

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99r.135c&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.135

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an extinction analysis of sight lines selected from all public FUSE observations of Galactic O and B stars. Over 90% of Milky Way extinction curves sampled from IR through UV wavelengths (UV coverage provided by IUE) conform to the CCM family of curves based on R(V), a single parameter linked to grain size (Cardelli, Clayton, & Mathis 1989, ApJ, 345, 245; Valencic, Clayton, & Gordon 2004, ApJ, 616, 912). The far-ultraviolet (FUV) portion of this formulation, however, was based only on a few sight lines observed by Copernicus. FUSE has observed a large number of diverse sight lines through the Galaxy, and a preliminary sample including paths characterised by a wide range of R (Sofia et al. 2005, ApJ, in press) suggests that CCM does not predict extinction in the FUV as accurately as it does at IUE wavelengths. We include in this poster a selection of sight lines from among the sample we are studying in search of a more accurate FUV extinction description.

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