A Correlation Between Surface Densities of Young Stellar

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Deviations from the <strong>Correlation</strong>: Local Evolutionary Differences? Class II YSOs in gray Class I YSOs in red N(CII) / N(CI) is consistently LOW for Gas Poor N(CII) / N(CI) is consistently HIGH for YSO Poor !(YSOs) (Msun / pc 2 ) 2000 200 20 2 0.2 Gas poor (YSO rich?) 10 100 !(gas) (Msun / pc 2 ) YSO poor (Gas rich?)
Gas Poor (YSO Rich?): Cep OB3b Cluster N(CII) / N(CI) ~ 30 Known OB stars have strong effect on gas! 3.6 micron 5.8 micron 24 micron T. Allen et al., in review; see also Getman et al. 2009 on Cep B / Cep OB3b east
Page 1 and 2: A Star and Gas Surface Density Corr
Page 3 and 4: A Few Terms Explained... YSO - Youn
Page 5 and 6: Nearby clusters are not spherical,
Page 7 and 8: Class I Class II Stars Form in Mole
Page 9 and 10: A Correlation Between Star and Gas
Page 11: !(YSOs) (Msun / pc 2 ) A Correlatio
Page 15 and 16: Circles: c2d cloud-integrated value
Page 17 and 18: Conclusions Most stars form in clus
Page 19 and 20: -5 -4 -3 -2 -1 Log {!(YSOs) / ! 2 (
Page 21 and 22: YSO Evolutionary State Ratio Maps M
Page 23 and 24: Area distributions of Surface Densi

A Correlation Between Surface Densities of Young Stellar

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