Spectroscopic classification of 42 Large Magellanic Cloud OB stars: Selection of probes for the hot gaseous halo of the Large Magellanic Cloud

Interstellar C IV absorption-line studies of the hot gaseous halo of the La rge Magellanic Cloud (LMC) have been hindered by nonideal selections of ear ly-type probe stars in regions where C+3 can be produced locally via photoi onization, fast stellar winds, or supernovae. To observe stars outside such regions, precise spectral classifications of OB stars in the field are nee ded. Therefore, we have obtained medium-dispersion spectra of 42 early-type stars in the LMC that are distributed outside superbubbles or supergiant s hells. The spectral classification of these stars is presented in this pape r. Nineteen of these program stars have spectral types between B1 and O7 an d are thus suitable probes for interstellar C IV absorption-line studies of the hot gaseous halo of the LMC.