I discuss in this paper the more likely physical mechanisms that could provide the energy input for the supersonic motions observed in giant extragalactic HII...
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PublicationSupersonic turbulence in giant extragalactic HII regions
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PublicationSurveying the Galactic plane
This paper discusses the Galactic plane as a case history of the application of different kinds of data bases to the problem of the large-scale Galactic...
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PublicationTemperature Bias and the Primordial Helium Abundance Determination
We study the effect that the temperature structure has on the determination of the primordial helium abundance, Yp. We provide an equation linking T(O III), the...
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PublicationTemperature Structure and Metallicity in H II Regions
The metallicities implied by collisionally excited lines (CELs) of heavy elements in H II regions are systematically lower than those implied by recombination...
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PublicationThe 100 Myr Star Formation History of NGC 5471 from Cluster and Resolved Stellar Photometry
We show that star formation in the giant H II region NGC 5471 has been ongoing during the past 100 Myr. Using Hubble Space Telescope/Wide-Field Planetary Camera...
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PublicationThe Abundance Gradient in NGC 3344
The steep abundance gradient found by McCall, Shields, and Rybski (1981) in the Sbc galaxy NGC 3344 is confirmed by a measurement of the electron temperature in...
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PublicationThe abundances of O, S, Cl, N, Ar, He and C in seven Galactic H bt II regions regions
An analysis of CCD spectra in the range lambda lambda4200 -8775, obtained at several positions of seven bright Galactic H Ii regions, with galactocentric...
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PublicationThe Aurora radiation-hydrodynamical simulations of reionization: calibration and first results
We introduce a new suite of radiation-hydrodynamical simulations of galaxy formation and reionization called Aurora. The Aurora simulations make use of a...
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PublicationThe bipolar H II region S 201
The authors discuss the nature of S 201 in the light of new optical and infrared observations, in terms of the interaction between an evolved H II region and a...