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We report mid- to far-infrared imaging and photomety from 7 to 37 micronswith SOFIA/FORCAST and 2 micron adaptive optics imaging with LBTI/LMIRCam of alarge sample of red supergiants (RSGs) in four Galactic clusters; RSGC1,RSGC2=Stephenson 2, RSGC3, and NGC 7419. The red supergiants in these clusterscover their expected range in luminosity and initial mass from approximately 9to more than 25 Solar masses. The population includes examples of verylate-type RSGs such as MY Cep which may be near the end of the RSG stage, highmass losing maser sources, yellow hypergiants and post-RSG candidates. Many ofthe stars and almost all of the most luminous have spectral energydistributions (SEDs) with extended infrared excess radiation at the longestwavelengths. To best model their SEDs we use DUSTY with a variable radialdensity distribution function to estimate their mass loss rates. Our mass lossrate -- luminosity relation for 42 RSGs basically follows the classical deJager curve, but at luminosities below 10^5 Solar luminosities we find asignificant population of red supergiants with mass loss rate below the deJager relation. At luminosities above 10^5 Solar luminosities there is a rapidtransition to higher mass loss rates that approximates and overlaps the deJager curve. We recommend that instead of using a linear relation or singlecurve, the empirical mass loss rate -- luminosity relation is betterrepresented by a broad band. Interestingly, the transition to much higher massloss rates at about 10^5 Lsun corresponds approximately to an initial mass of18 --20 Msun which is close to the upper limit for RSGs becoming Type II SNe.

Exploring the Mass Loss Histories of the Red Supergiants