NOAO >   Observing Info >   Approved Programs >   2011B-0532

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Proposal Information for 2011B-0532


PI: Benjamin A. Sargent, Space Telescope Science Institute, sargent@stsci.edu
Address: Science Mission Office, 3700 San Martin Drive, Baltimore, MD 21218

Title: Spectroscopic Confirmation of Four Low-Luminosity B[e] Supergiant Candidate Stars

Abstract: The late stages of the evolution of a massive star are not well understood and deserve further study. One class of massive stars is the B[e] supergiant, but relatively few of these are known. In this proposal, 4 new B[e] supergiant candidates are presented. These candidates meet some of the criteria that have been compiled to determine whether a star is a B[e] supergiant. This includes B spectral type, H-(alpha) emission, warm circumstellar dust disks emitting strongly in the mid-infrared, and near-infrared colors consistent with other B[e] supergiant stars. However it is unknown whether they share other known characteristics of this class: strong Balmer emission lines, low-excitation permitted lines from low-ionization metals like FeII, and forbidden emission lines of [FeII] and [OI]. I propose optical spectra be obtained using the R-C Spectrograph on the SMARTS 1.5m telescope at CTIO from service observing to confirm these 4 stars' identities as B[e] supergiants. If preliminary modeling of the stellar photosphere emission is correct, these will be amongst the lowest luminosity B[e] supergiants known.


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NOAO >   Observing Info >   Approved Programs >   2011B-0532

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