Statistics – Methodology
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9945p&link_type=abstract
HST Proposal ID #9945
Statistics
Methodology
Hst Proposal Id #9945 Hot Stars
Scientific paper
Are the rotational velocities of massive stars the same in all galaxies? We lack the key measurements of projected rotational velocity, Vsin i, to answer this important question. There is no study of the Vsin i distribution for stars in any galaxy other than the Milky Way. We propose to determine the Vsin i values of these lower metallicity, high mass stars from UV observations of 21 Large Magellanic Cloud {LMC} and 23 Small Magellanic Cloud {SMC} O-type stars with well determined spectral classifications. Our methodology is based on a previous study of the projected rotational velocities of Galactic O-type stars using the International Ultraviolet Explorer {IUE} Short Wavelength Prime {SWP} camera high dispersion spectra. This previous study resulted in a catalog of Vsin i values for 177 O stars based on the Conti & Ebbets {1977} system. Our proposed project would produce Vsin i values on the same system so that all three metallicity enviroments could be compared without biases that might be present due to individual atmospheric models being fit to differing visual absorption features. Our project would be the first study of projected rotational velocities of O-type stars outside our own Galaxy and is crucially needed to constrain several areas in the theoretical study of massive stars and their evolution, notably the predictions that massive stars in a low metallicity environment {1} may form with higher rotational velocities and {2} will have decreased angular momentum loss as they evolve.
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