Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977lastr..91..377l&link_type=abstract
L'Astronomie, vol. 91, Oct. 1977, p. 377-386. In French.
Astronomy and Astrophysics
Astronomy
Early Stars, Shock Waves, Stellar Evolution, Interstellar Gas, O Stars, Spiral Galaxies, Stellar Mass, Stellar Structure, Stellar Temperature, Ultraviolet Spectra
Scientific paper
Observations of M33 in Triangulum support the theory that a shock wave in the arms of a spiral galaxy can increase the density of gas so that star formation occurs. This shock wave would be caused by a sudden reduction of gas velocity as the gas encounters the local conditions in the arm. For unknown reasons the velocity patterns in the north and south arms of M33 differ. Velocity reduction is found in the south arm, and it is there that a chain of 40 ionized regions of a spherical and regular form are observed, with diameters between 100 and 170 light years and similar intensities. Each of these regions contain 1 to 17 O7 stars, and 7 regions have a more massive and hotter O5 star. (Temperatures can be reduced from the amount of ionization observed in nearby gases.) The similarity of the regions and the apparent homogeneity in stellar ages is considered to be consistent with a shock wave mechanism. Star formation in the north arm is thought to proceed by a different mechanism.
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