The mass function of blue stars, the production rate of Lyc-photons, and the rate of star formation in M 33

Details The mass function of blue stars, the production rate of Lyc-photons, and the rate of star formation in M 33 The mass function of blue stars, the production rate of Lyc-photons, and the rate of star formation in M 33

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..369b&link_type=abstract

Astronomy and Astrophysics, vol. 112, no. 2, Aug. 1982, p. 369-376.

Mathematics

21

Blue Stars, Particle Production, Photons, Star Formation, Stellar Mass, Cosmic Gases, Functions (Mathematics), Gas Density, Interplanetary Magnetic Fields, Ion Production Rates, Mass To Light Ratios, Milky Way Galaxy, Stellar Evolution, Stellar Luminosity

Scientific paper

The Present Day Mass Function and the Initial Mass Function for stars of masses greater than 10 solar masses in M 33 were derived by extrapolating the upper part of the Luminosity Function constructed from the catalogue of Humphreys and Sandage (1980). The rate of Lyc-photons expected from stars of 10 to 100 solar masses is in good agreement with the rate needed to ionize the gas as inferred from alpha H observations taking absorption effects into account. Similarly, the IMFs for the solar neighborhood satisfactorily predict the rate of Lyc-photons obtained from radio observations of the ionized gas. Comparison of various quantities bearing on star formation in M 33 and the Galaxy indicates that: (1) The fraction of high-mass stars of the total mass is three to four times higher in M 33 than in the SN, but comparable to that of the galactic disk; (2) The rate of star formation per unit of H I mass in M 33 is about four times smaller than that of the galactic disk, possibly because of a smaller volume density of the molecular gas or of the total gas component.

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