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Stellar associations and complexes in M33
Astrophysics and Space Science, 1987About 460 OB associations were selected by a comparison of theUBV plates. TheUBV photographic photometry of 1944 blue stars in the associations was made. The new associations appear like cores within Humphreys and Sandage's associations. Their star content, size distribution, and mean size ≈80 pc confirm their identity with the OB associations in the ...
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THE STELLAR ASSOCIATIONS OF THE SMALL MAGELLANIC CLOUD.
Publications of the Astronomical Society of the Pacific, 1985The stellar associations of the SMC are less well defined than those of the LMC. A catalog is presented of 70 probable examples, of which 16 objects are of a more questionable nature. The associations have almost exactly the same mean size as those in the LMC but are poorer in the number of bright members. There are several problems in establishing the
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New stellar associations in M33 galaxy
Astrophysics and Space Science, 1984Extending the numeration of Humphreys and Sandage (1980) 54 new associations are identified in the galaxy M33 by comparing the plates in theU andB system. The larger part of the associations are located in the spiral arms. The young associations are prevailing in proximity to the nucleus.
P. Z. Kunchev, G. R. Ivanov
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On the expansion of stellar association Per OB2
Astrophysics, 1999The analysis of the proper motions of bright members of the Per OB2 association on the basis of Hipparcos high-accuracy astromethc observations is presented. The existence of two different subgroups of OB-stars in the Per OB2 association that are in the state of expansion is considered. The expansion ages are calculated as 1.3 and 1.9×106 years.
L. V. Mirzoyan +4 more
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Observations of stellar magnetism and associated phenomena
EAS Publications Series, 2013This paper first surveys how stellar magnetic fields are measured, and especially the impact of the most recent spectropolarimeters on our measurement capabilities. The two main types of stellar magnetism, dynamo and fossil fields, are discussed in a general way. This is followed by a broad survey of the current level of knowledge of magnetic fields in
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Relationship between pulsars and stellar associations
Astrophysics, 1997The spatial distribution of pulsars and stellar associations in the solar neighborhood is investigated on the basis of recent data. The distribution of young pulsars and stellar associations indicates fragments of the spiral structure of the galaxy.
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STELLAR ASSOCIATIONS IN THE GALAXY NGC 2403.
Publications of the Astronomical Society of the Pacific, 1985Stellar associations in the Sc galaxy NGC 2403 are identified and compared to similar samples in Local Group galaxies. Their properties, including the total number delineated, their sizes, the average number of supergiant stars they contain, and their radial distribution are tabulated and are shown to be similar to those of M33 and the LMC. The stellar
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Galactic Clusters and Stellar Associations
2014A casual glance at the night sky may lead you into believing that stars are solitary, isolated objects, but in fact no star is born in isolation. As we have discussed in previous chapters, the process of star birth takes place in immense interstellar clouds of dust and gas that, depending upon the cloud’s size, can give rise to anything from a few ...
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Stellar Content and Evolution of OB Associations
Publications of the Astronomical Society of the Pacific, 1996An important goal in astronomy is to understand the star formation process. Studies thereof have led to fairly detailed theoretical knowledge of the formation of individual stars. However, there is no detailed understanding of the origin of global properties of the stellar population, such as the initial mass function.
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