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On the Arm Pattern of M33

Published online by Cambridge University Press:  04 August 2017

Georgi Raikov Ivanov  and
Peter Z. Kunchev
Georgi Raikov Ivanov
Affiliation:
UNIVERSITY OF SOFIA, DEPARTMENT OF ASTRONOMY, SOFIA, BULGARIA
Peter Z. Kunchev
Affiliation:
UNIVERSITY OF SOFIA, DEPARTMENT OF ASTRONOMY, SOFIA, BULGARIA

Extract

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By comparison of U and B plates of M33 we extended the numerations of Humphreys and Sandage (1980) adding 54 new OB associations. The associations identified by HS are outlined with continuous line and ours are represented with dash on Figure 1. Many of the identified by us associations are near the nucleus of M33. Due to U plate used by us the background in the central region is fainter than that on the B plate and the associations are distinguished very well on U plate (Kunchev and Ivanov, 1984). Our associations of the outer region of M33 consist mainly of relatively fainter young B stars.

Type
Poster Papers 3
Information
Symposium - International Astronomical Union , Volume 116: Luminous Stars and Associations in Galaxies , 1986 , pp. 419 - 420
Copyright
Copyright © Reidel 1986 

References

Humphreys, R. M., Sandage, A. 1980, Ap. J. 44, 319.Google Scholar
Kunchev, P. Z., Ivanov, G. R. 1984, Astrophysics and Space Sci., 106, 371.Google Scholar
Maucherat, A. J., Dubout-Crillon, R., Monnet, G., Figon, P. 1984, Astron. Astrophys. 133, 341.Google Scholar