Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725006l&link_type=abstract
American Astronomical Society, AAS Meeting #217, #250.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The value of the ratio of total-to-selective extinction, RV, allows extinction to be calculated from observation of reddening. Variation in the ratio due to variation in the foreground grain size distribution adds additional uncertainty to knowledge of extinction and ultimately distance. This work uses model calculations to show that when RV is measured by comparing observed colors of background stars to their intrinsic colors based on spectral type, the uncertainty in RV is a complicated function of spectral type. How sensitive the value of RV is to the precision of the spectral type varies widely across the range of stellar spectral type. Results from this modeling can be used to select stars that would yield the most accurate map of real variations in the value of RV.
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