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Title:
On the distance to the Chamaeleon I and II associations
Authors:
Whittet, D. C. B.; Prusti, T.; Franco, G. A. P.; Gerakines, P. A.; Kilkenny, D.; Larson, K. A.; Wesselius, P. R.
Affiliation:
AA(Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA; SRON, P.O. Box 800, 9700 AV Groningen, The Netherlands), AB(ISO Science Operations Centre, Astrophysics Division, ESA, Villafranca del Castillo, P.O. Box 50727, E-28080 Madrid, Spain), AC(Departamento de Fisica -- ICEx -- UFMG, Caixa Postal 702, 30.161-970 -- Belo Horizonte -- MG, Brasil), AD(Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA; Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands), AE(SAAO, P.O. Box 9, Observatory, Cape 7935, South Africa), AF(Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA), AG(SRON, P.O. Box 800, 9700 AV Groningen, The Netherlands)
Publication:
Astronomy and Astrophysics, v.327, p.1194-1205 (1997) (A&A Homepage)
Publication Date:
11/1997
Origin:
A&A
A&A Keywords:
STARS: DISTANCES, ISM: CLOUDS, DUST, EXTINCTION, CHAMAELEON CLOUDS, REFLECTION NEBULAE
Bibliographic Code:
1997A&A...327.1194W

Abstract

Constraints on the distances to the dark clouds Chamaeleon I and II are investigated in detail. A compilation of photometric data, spectral types and absolute magnitudes for field stars towards each cloud is presented, and results are used to examine the distribution of reddening with distance along each line of sight. The distances to stars associated with reflection nebulae in each cloud are examined in detail. On the basis of these results, we deduce the most probable distance of Cha I to be 160+/-15pc, and that of Cha II to be 178+/-18pc. An examination of the mean fluxes of T Tauri stars in each cloud provides independent evidence to suggest that Cha II is significantly more distant than Cha I. Both clouds appear to be embedded in a macroscopic sheet-like structure extending over much of the Chamaeleon-Musca-Crux region. The Chamaeleon III and DC\ts 300.2--16.9 clouds are probably part of the same structure, with probable distances ~ 140--160pc.

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