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Astron. Astrophys. 317, 898-906 (1997)

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Structure of L 1521B: CO observations of a dense core in Taurus

M. Juvela 1, K. Lehtinen 1, K. Mattila 1, D. Lemke 2 and L. Haikala 1

1 Helsinki University Observatory, Tähtitorninmäki, P.O.Box 14, SF-00014 University of Helsinki, Finland
2 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany

Received 17 February 1996 / Accepted 31 May 1996


L 1521B is a dense core near B216 in one of the long filaments of the Taurus molecular cloud complex. The core is not associated with any known IR sources and shows no apparent signs of star formation. We have mapped the cloud in 13 CO(1-0) and C18 O(1-0) using a grid of [FORMULA]. This area, altogether some 140 square arc minutes, contains the density maximum as well as some parts of the filament north-west of the cloud centre. At the centre position we derive a column density N(C18 O)=4 [FORMULA] 1015 cm-2 and an optical depth of about 1.3 for C18 O. Using a value of r=140 pc for the distance we estimate that the total mass contained within a radius of [FORMULA] around the density maximum is about 20 solar masses. The visual extinction has been estimated from the C18 O column density and through star counts of two fields observed at 2.2µm. The extinction in the central region is [FORMULA] [FORMULA].

We have also mapped part of the B216 filament about one degree north-west of the centre of L 1521B in C18 O(1-0). This area contains two IRAS point sources which are probably associated with class I protostars.

Key words: ISM: clouds – ISM: molecules – ISM: L 1521B – radio lines: ISM

Send offprint requests to: M. Juvela

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998