Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..499r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 2, p. 499-509.
Astronomy and Astrophysics
Astronomy
20
Astronomical Photometry, Charge Coupled Devices, Galactic Structure, Local Group (Astronomy), Ubv Spectra, Blue Stars, Interstellar Matter, Star Formation, Stellar Winds
Scientific paper
OB associations in the southern arm of the Local Group galaxy M33 are identified, and their properties are determined on the basis of UBV CCD photometry. Twenty associations that contain at least 10 blue stars are found in this region. Comparison of several age estimators shows that formation was not coeval in some of the associations. The associations in the spiral arm form two groups, with a spatial separation of about 1 kpc and an age difference of about 2 Myr. The youngest associations lie near a kink in the spiral arm, where orbit crowding could be a trigger for star formation. CO is detected upstream of this group, consistent with streaming motions due to a density wave. An age gradient perpendicular to the spiral arm is seen when either the presence of evolved stars or the radius of the association is used to identify old associations. This age gradient suggests that a spiral density wave is the trigger for the star formation in this spiral arm of M33.
Regan Michael W.
Wilson Christine Diana
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