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Computer‐Assisted Reduction of Photographic Two‐Colour Diagrams Application to Field Stars Near IC 348
Author(s) -
Pfau W.,
Lehmann H.
Publication year - 1982
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2103030304
Subject(s) - physics , stars , photometry (optics) , astrophysics , diagram , hertzsprung–russell diagram , data reduction , astronomy , stellar evolution , mathematics , statistics
A computer programme is described which derives amounts of reddening and distances of stars from UBV photometry. I t is based on analytical expressions for the normal line in the two‐colour diagram and for the absolute magnitude as a fucction of the intrinsic colour (Eqns. (I) and (3)). The programme was applied to photographic UBV data of two fields of stars in the vicinity of the galactic cluster IC 348. It is shown that the interstellar dust is concentrated there in a thin slab situated a t about zoo pc to 300 pc distance and giving rise to amounts of reddening, E(B ‐ V ), of about 0.4 mag. and 0.8 mag. for the two fields, resp.