The Dense Galactic Starburst NGC 3603. I. HST/FOS Spectroscopy of Individual Stars in the Core and the source of Ionization and Kinetic Energy

Details The Dense Galactic Starburst NGC 3603. I. HST/FOS Spectroscopy of Individual Stars in the Core and the source of Ionization and Kinetic Energy The Dense Galactic Starburst NGC 3603. I. HST/FOS Spectroscopy of Individual Stars in the Core and the source of Ionization and Kinetic Energy

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2235d&link_type=abstract

Astronomical Journal v.110, p.2235

Astronomy and Astrophysics

Astronomy

111

Ism: Kinematics And Dynamics, Hii Regions, Ism: Individual: Ngc 3603

Scientific paper

We present spectrograms of 14 individual luminous stars in RD 97950, the core (r≤4"=0.12 pc) of the dense galactic starburst NGC 3603, obtained with the Faint Object Spectrograph aboard the refurbished Hubble Space Telescope. In a volume of less than a cubic light year, three luminous hydrogen-rich WNL+abs stars cohabit with six O3 stars [including two O3 III (f*)] and other early O stars; RD 97950 is therefore the densest concentration of very massive stars known in the Galaxy. The close physical association between O3 and WNL + abs stars, as well as the evolution of spectroscopic features, suggests a direct evolutionary link between them. The total output of Lyman continuum photons from these 14 stars alone accounts for more than 80% of what is required to ionize the surrounding nebula. The very small radius of the wind-driven bubble surrounding RD 97950 seems at odds with the tremendous power, LW ˜3.2 × 1038 erg s-1, supplied by massive stars to the nebula.

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