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Astronomy & Astrophysics manuscript no. September 25, 2002 (DOI: will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no. September 25, 2002
(DOI: will be inserted by hand later)
Far­infrared photometry of deeply embedded outflow sources ?
Dirk Froebrich 1 , Michael D. Smith 2 , Klaus W. Hodapp 3 and Jochen Eisl˜offel 1
1 Th˜uringer Landessternwarte Tautenburg, Sternwarte 5, D­07778 Tautenburg, Germany
2 Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
3 University of Hawaii, Institute for Astronomy, 640 N. Aohoku Place, Hilo, HI 96720, USA
Received sooner / Accepted later
Abstract. We present far­infrared maps and spectroscopy for several deeply embedded protostellar objects from data acquired
with the ISO instruments PHOT and LWS. Spectral energy distributions for Cep E, HH 211­MM, IC 1396 W, L 1157, L 1211 and
RNO 15 FIR indicate that these are relatively cold Class 0 sources. Several previously undetected deeply embedded sources are
found in the vicinity of our targets. We determine temperatures and luminosities of seven objects and locate them on a L bol ­T bol
diagram -- the equivalent to a Hertzsprung­Russell diagram for protostars. Their masses and ages, according to their location
on tracks derived from an/our evolutionary model, are derived. L 1211 and Cep E appear to be intermediate mass objects which
will reach final masses of about 3 M , while the other sources are in or below the solar mass range. The derived ages of 15000
to 30000 yr are consistent with their current Class 0 state. A comparison of the luminosity of the associated outflows in the
1 -- 0 S(1) line of molecular hydrogen with the source properties (bolometric luminosity, bolometric temperature and envelope
mass) of 15 Class 0 sources shows no statistically significant correlations. Nevertheless, the data are consistent with a scheme
in which the outflow strength and protostar evolve simultaneously. The relationship is partially disguised, however, by the local
properties of the surrounding material, the extinction and short­term flux variability.


Source: Armagh Observatory


Collections: Physics