Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115..347a&link_type=abstract
Astronomy and Astrophysics, vol. 115, no. 2, Nov. 1982, p. 347-356.
Astronomy and Astrophysics
Astrophysics
22
Absorption Spectra, Infrared Absorption, Interstellar Extinction, Least Squares Method, Linearity
Scientific paper
The wave-number dependence of interstellar absorption has been studied in the interval λ-1=0.95μ-1 to λ-1=3.03μ-1. The study has been based on data from narrow- band photoelectric photometry and scanning. Pairs of 0 stars observed by the same observer, with identical MK classes and with significant differential reddening have been identified. The differential interstellar absorption, normalized corresponding to E(B - V) =1.00, has been studied versus wave number. Further, differential gradient values have been studied versus differential colour excess. To a first approximation the interstellar absorption law can be approximated by two linear relations, intersecting around λ-1 = 2.30μ-1. The ratio of the first-order coefficients is around 0.78. For higher accuracy five first-order polynomials have to be used. The intervals join at λ-1=1.55μ-1, 1.80μ-1, 2.20μ-1, and 2.48μ-1. The resulting accuracy may be even somewhat further improved if a spline relation is fitted to the differences remaining between the observed data and the five gradients polygon. The data at hand seem to support universality of the interstellar-absorption law for the wave-number region studied. Possible slight deviations may exist in certain intervals of galactic longitude.
Ardeberg Arne
Virdefors B.
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