Other
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..138b&link_type=abstract
NOAO Proposal ID #2000A-0138
Other
Scientific paper
Luminous hot (massive) stars are tracers of recent star formation in our Galaxy (and elsewhere). During the course of their evolution they develop emission line features, partly in the Luminous Blue Variable (LBV) phase and eventually in the Wolf-Rayet stage. The presence of emission lines eases the identification of massive stars, which are otherwise greatly outnumbered by fainter and cooler lower mass objects in sky images. Massive stars are very luminous and could, in principle, be observed in the optical across the Galaxy were it not for the presence of interstellar dust in the Milky Way. Galactic surveys of distant stars at visible wavelengths is hopeless; but in the near IR the extinction is much lower. Luminous stars have already been identified in the Galactic center. We propose to continue a narrow-band imaging survey for emission-line stars elsewhere in the inner Galaxy in the lines of HeI, HeII, Br(gamma), and CIV which are present in the 2 µ spectra of massive, evolved stars. In this proposal we select a sample region in the galactic plane which contains four known radio HII regions (where we know luminous hot stars must be present). When complete, the survey will trace the very young stellar population inward of the solar circle, allowing studies of Galactic structure, stellar evolution, and star formation to be extended significantly beyond the limits imposed on optical studies by intervening dust.
Blum Robert
Conti Peter
Damineli Augusto
Homeier Nicole
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