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Issue A&A
Volume 471, Number 3, September I 2007
Page(s) 841 - 847
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20066081



A&A 471, 841-847 (2007)
DOI: 10.1051/0004-6361:20066081

Geysers in the Lagoon: new Herbig-Haro objects in M 8

R. H. Barbá1 and J. I. Arias1, 2

1  Departamento de Física, Universidad de La Serena, Benavente 980, La Serena, Chile
    e-mail: rbarba@dfuls.cl
2  Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, and Instituto de Astrofísica La Plata, Paseo del Bosque S/N, B1900FWA, La Plata, Argentina
    e-mail: julia@djuls.cl

(Received 21 July 2006 / Accepted 15 June 2007)

Abstract
Aims.We search for direct evidence of ongoing star formation by accretion in the Lagoon Nebula (M 8), using optical wide-field narrow-band imaging obtained at La Silla Observatory.
Methods.We examine [ $\ion{S}{ii}$] and H$\alpha$ images for line-emission features that could be interpreted as signatures of outflow activity of the exciting sources.
Results.We discover five new Herbig-Haro objects, study in detail their morphology and attempt to identify their potential driving sources among the population of T Tauri stars and embedded sources in the surroundings.
Conclusions.The results reported here conclusively demonstrate the existence of very young stars going through the accreting phase in the M 8 region.


Key words: ISM: Herbig-Haro objects -- ISM: jets and outflows -- stars: formation



© ESO 2007


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