NOAO >   Observing Info >   Approved Programs >   2012B-0521

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Proposal Information for 2012B-0521


PI: Guy Stringfellow, University of Colorado, Guy.Stringfellow@colorado.edu
Address: Center for Astrophysics and Space Astronomy, 389 UCB, Boulder, CO 80309-0389, USA

CoI: Vasilii Gvaramadze, Sternberg Astronomical Institute, Russia

Title: Confirming LBV Candidates Through Variability: A Photometric and Spectroscopic Monitoring Study

Abstract: Luminous Blue Variable (LBV) stars represent an extremely rare class of very luminous, massive stars. About a dozen confirmed Galactic LBV stars are known, which precludes determining a solid evolutionary connection between LBV and other intermediate (e.g. Ofpe/WN9, WNL) phases in the life of very massive stars. Several catalogues of nebulae - rings and shells typical of LBVs - derived from the GLIMPSE and MIPSGAL surveys have recently been published. We conducted a near-IR spectral survey of a large subset of central stars residing within these nebulae and have identified nearly two dozen new candidate LBVs (cLBVs) based on spectral similarity alone; they remain cLBVs until 1-3 mag variability is demonstrated, securing their LBV nature. This marks a significant advancement in the study of massive stars, far outweighing the return from many studies searching for LBVs and WRs the past several decades. Using SMARTS 16 new cLBVs, 3 confirmed LBVs, and 4 previously known cLBVs will undergo photometric optical/IR-monitoring with the 1.3m, and 13 (c)LBVs monitored spectroscopically with the 1.5m.


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