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Distribution of luminous blue stars in M 33
Author(s) -
Ivanov G. R.,
Kunchev P. Z.
Publication year - 1986
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.2113070606
Subject(s) - stars , physics , spiral galaxy , astrophysics , distance modulus , distribution (mathematics) , astronomy , metallicity , mathematics , mathematical analysis
M 33 luminous stars with M V ≲ ‐7 and U‐‐B < o are selected in this paper. The spatial distribution of the stars shows a good agrement with the associations and HII regions. However HII regions are absent in the three youngest associations in M 33 ( t ≈ 5 ÷ 7 × 10yr). It is supposed that the true distance modulus of M 33 derived from the brightest blue stars is 24.2. An age gradient across the arms is absent. The spiral arms outlined by the luminous stars differ form those in M 31 . They are diffuse and wide. The multiarm features of M 33 support the stochastic self‐propagating model.