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We describe our spectroscopic follow-up to the Local Group Galaxy Survey(LGGS) photometry of M31 and M33. We have obtained new spectroscopy of 1895stars, allowing us to classify 1496 of them for the first time. Our study hasidentified many foreground stars, and established membership for hundreds ofearly- and mid-type supergiants. We have also found 9 new candidate LuminousBlue Variables and a previously unrecognized Wolf-Rayet star. We republish theLGGS M31 and M33 catalogs with improved coordinates and including spectroscopyfrom the literature and our new results. The spectroscopy in this paper isresponsible for the vast majority of the stellar classifications in these twonearby spiral neighbors. The most luminous (and hence massive) of the stars inour sample are early-type B supergiants, as expected; the more massive O starswill be fainter visually, and thus mostly remain unobserved so far. Themajority of the unevolved stars in our sample are in the 20-40Mo range.

A Spectroscopic Survey of Massive Stars in M31 and M33