Statistics – Computation
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...60..577t&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 60, Feb. 1986, p. 577-599.
Statistics
Computation
152
Computational Astrophysics, Image Analysis, Infrared Photometry, Transformations (Mathematics), Hot Stars, Interstellar Extinction, Paschen Series, Tables (Data)
Scientific paper
Transformations among VRI systems are commonly beset by Paschen-jump effects, for which fully satisfactory allowance has not previously been made. This paper describes two new techniques which are based on the work of Gutierrez-Moreno, and which allow fully for the effects of the Paschen jump. Values of E(V-R)/E(B-V) and E(R-I)/E(B-V) are also given for the Cousins system for a wide range of temperatures. These and the new techniques contribute to a set of new transformation relations which apply for most VRI systems; the status of the remaining systems is reviewed, and future work needed for them is described. Two major sources of Cousins VRI data underlie the new relations; the consistency of these sources is reviewed and found to be generally satisfactory, although more work on this question is needed. Finally, three tables of transformed standard-star and other data are given for the Cousins and Johnson systems, and a description of ways to reproduce the latter is presented.
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