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Stellar Associations in the Andromeda Nebula.

1964; Institute of Physics; Volume: 9; Linguagem: Inglês

10.1086/190097

1538-4365

Sidney van den Bergh,

Astrophysics and Star Formation Studies

view Abstract Citations (174) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Stellar Associations in the Andromeda Nebula. van den Bergh, Sidney Abstract Plates in five colors obtained with the 52-inch Schmidt telescope have been used to study the distribution of bright young stars in M31. A total of 188 OB associations were found in the region 3-25 kpc from the nucleus. Descriptions and identification charts are given for all associations. It is estimated that ten new OB associations are formed in M3 1 every 1000000 years. A number of associations are seen to consist of dense young cores surrounded by somewhat older envelopes. The diameters of these dense cores are comparable to the observed dimensions of galactic OB associations. A provisional age classification of the associations in M3 1 indicates that different spiral-arm segments have different ages. The inner spiral structure of M3 1 is found to be trailing. The outer spiral arms appear to form ring segments. Publication: The Astrophysical Journal Supplement Series Pub Date: June 1964 DOI: 10.1086/190097 Bibcode: 1964ApJS....9...65V full text sources ADS | data products SIMBAD (23) NED (1)