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[82.05] Spitzer Space Telescope Observations of an Aggregate of Young Stellar Objects in L1228 South

D. Padgett, L. Rebull, A. Noriega-Crespo, S. Carey (SSC), K. Stapelfeldt (JPL), J. Stauffer, M. Burgdorf (SSC), D. Cole (JPL), S. Fajardo-Acosta, D. Frayer, W. Glaccum, G. Helou, D. Hoard, J. Karr, W. Latter, P. Lowrance, J. O'Linger, F. Masci, S. Ramirez, J. Rho, S. Stolovy, W. Reach, S. Wachter (SSC)

Using the Spitzer Space Telescope MIPS and IRAC instruments, we have discovered an aggregate of at least 9 bright young stellar objects in the southern region of the Lynds 1228 cloud in Cepheus. The spectral energy distributions (SEDs) encompass both infrared (IR) Class II and Class III types, and at least one object has no excess at wavelengths shorter than 24 microns. There are 5 known IRAS sources in the region. We find that the fluxes of these sources are generally overestimated by IRAS due to confusion, and one appears in both the IRAS Point Source and Faint Source catalogs. This small group of YSOs provides a good example of the power of Spitzer to resolve star-forming regions confused in the IRAS catalogs. The SEDs of these sources illustrates that there can be a diversity of disk evolutionary states within a coeval stellar aggregate.

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Bulletin of the American Astronomical Society, 36 #2
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