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Title:
An Infrared Study of the L1551 Star Formation Region - What We Have Learnt from ISO and the Promise for FIRST
Authors:
White, G. J.; Liseau, Rene; Men'shchikov, A.; Justtanont, K.; Nisini, B.; Benedettini, M.; Caux, E.; Correia, J. C.; Kaufman, M.; Molinari, S.; Lorenzetti, D.; Saraceno, P.; Smith, H. A.; Spinoglio, L.; Tommasi, E.; Fridlund, C. V. M.
Affiliation:
AA(Unit for Space Sciences, The University of Kent, Canterbury, Kent CT2 7NR, England; Stockholm Observatory, Saltsjöbaden, Sweden), AB(Stockholm Observatory, Saltsjöbaden, Sweden), AC(Stockholm Observatory, Saltsjöbaden, Sweden), AD(Stockholm Observatory, Saltsjöbaden, Sweden), AE(Istituto di Fisica Spazio Interplanetario, CNR Area Ricerca Tor Vergata, via Fosso del Cavaliere, I-00133 Roma, Italy), AF(Istituto di Fisica Spazio Interplanetario, CNR Area Ricerca Tor Vergata, via Fosso del Cavaliere, I-00133 Roma, Italy), AG(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414, Rue de la Piscine, Domaine Universitaire de Grenoble BP 53 - F-38041, Grenoble Cedex 9 France), AH(Stockholm Observatory, Saltsjöbaden, Sweden), AI(Department of Physics, San Jose State University, San Jose, CA 95192-0106, USA), AJ(Osservatorio Astronomico di Roma, via Frascati 33, I-00040 Monte Porzio, Italy), AK(IPAC/Caltech, MS 100-22, Pasadena, CA, USA), AL(Istituto di Fisica Spazio Interplanetario, CNR Area Ricerca Tor Vergata, via Fosso del Cavaliere, I-00133 Roma, Italy), AM(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138. USA), AN(Istituto di Fisica Spazio Interplanetario, CNR Area Ricerca Tor Vergata, via Fosso del Cavaliere, I-00133 Roma, Italy), AO(Italian Space Agency, Via di Villa Patrizi 13, I-00161 Roma Italy), AP(ESA Astrophysics Division, Space Science Department, ESTEC, Postbus 299, NL-2200, AG Noordwijk, The Netherlands)
Publication:
The Promise of the Herschel Space Observatory. Eds. G.L. Pilbratt, J. Cernicharo, A.M. Heras, T. Prusti, & R. Harris. ESA-SP 460, p. 215
Publication Date:
07/2001
Origin:
AUTHOR
Keywords:
INTERSTELLAR MEDIUM: STAR FORMATION, INDIVIDUAL SOURCE: L1551, MISSIONS: FIRST
Bibliographic Code:
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 Lsolar, surrounding a dense torus extending to a distance of ~ 30,000 AU, which has a total (gas + dust) mass of 25 Msolar. 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 microns is due to scattered light from close to L1551 IRS 5, while at wavelengths greater than 4 microns, is seen through the full extinguishing column towards the central source.

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