Identification of Emission-Line Stars in 30 Doradus Using HST Observations

Details Identification of Emission-Line Stars in 30 Doradus Using HST Observations Identification of Emission-Line Stars in 30 Doradus Using HST Observations

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448..705p&link_type=abstract

Astrophysical Journal v.448, p.705

Astronomy and Astrophysics

Astronomy

16

Galaxies: Magellanic Clouds, Galaxy: Open Clusters And Associations: Individual Name: 30 Doradus, Ism: H Ii Regions, Stars: Evolution, Stars: Wolf-Rayet

Scientific paper

Using broadband (F439W) and narrowband (F469N) Hubble Space Telescope archive images of the R136 central cluster of 30 Doradus, we have identified candidate Wolf-Rayet stars from the strength of their He II λ4686 emission lines. The number ratio of Wolf-Rayet to O stars found in our data is 0.11±0.03. Our results are more consistent with an instantaneous burst with an age of about 3 × 106 yr than with a continuous star formation scenario. However, even in the starburst scenario, evolutionary model predictions for low-metallicity stellar evolution agree with our observations only if we also assume enhanced mass loss and/or a relatively flat slope (Γ > -1.35) for the initial mass function with an upper mass limit of more than 80 Msun.

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