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Selection, Statistics and Photometry of Compact Galaxies with Different Instrumental Equipment. Part I
Author(s) -
Richter N.,
Schnell A.
Publication year - 1979
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.19793000605
Subject(s) - physics , astrophysics , photometry (optics) , limiting magnitude , galaxy , telescope , brightness , observatory , angular diameter , magnitude (astronomy) , astronomy , optics , stars
On plates taken with 2 different photographic telescopes compact galaxies in 3 fields near M 3 and M 92 were selected. The integral magnitudes and maximum angular diameters of the compacts were determined. The R ITCHEY ‐C HRéTIEN telescope of the F IGL Observatory for Astrophysics (FOA) with a focal ratio of 1:8.3 has a scale of 1 mm = 16.3, while the Tautenburg S CHMIDT with 1:3.2 has a scale of 1 mm ≌ 52°. From the selection statistics for both telescopes results nearly the same number of objects (50) up to 18 m .5 in V in a field of 1.5□°.60% of these objects are identical. An integral photometry on B plates of the same limiting magnitude from both telescopes leads to nearly the same brightness of objects, while they are o m .5 fainter on FOA V plates. Because of its smaller focal ratio this telescope does not record the halo parts of the compacts. This is clearly demonstrated by the maximum equidensitometric diameters which on FAO plates are on the average only half of those determined on Tautenburg plates. A diameter magnitude diagram is shown.