An infrared study of the L1551 star formation region - what we have learnt from ISO and the promise for FIRST

White, Glenn J.; Liseau, Rene; Men'schikov, A.; Justtanont, Kay; Nisini, Brunella; Benedettini, M.; Caux, E.; Correia, J. C.; Kaufman, M.; Lorenzetti, D.; Molinari, S.; Saraceno, P.; Smith, H. A.; Spinoglio, L.; Tommasi, E. and Fridlund, C. V. M. (2001). An infrared study of the L1551 star formation region - what we have learnt from ISO and the promise for FIRST. In: The Promise of the Herschel Space Observatory - ESA-SP 460, 12-15 Dec 2000, Toledo, Spain.

URL: http://cdsads.u-strasbg.fr/abs/2001ESASP.460..215W

Abstract

ISO spectroscopic observations are reported towards the well known infrared source L1551 IRS 5. The continuum spectral energy distribution has been modelled using a 2D radiative transfer model, and fitted for a central source luminosity of 50 L⊙, surrounding a dense torus extending to a distance of ~ 30,000 AU, which has a total (gas + dust) mass of 25 M⊙. The extinction towards the outflow is estimated to be Av = 11 and the mid-plane optical depth to L1551 IRS 5 to be 140. On the basis of this model, the extinction curve shows that emission at wavelengths shorter than ~ 2 μm is due to scattered light from close to L1551 IRS 5, while at wavelengths greater than 4 μm, is seen through the full extinguishing column towards the central source.

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