A. L. Gyulbudaghian1 and R. A. Mendez2
1 Byurakan Astrophysical Observatory, 378433 Byurakan, Armenia. (agyulb@bao.sci.am).
2 Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile. (rmendez@u.uchile.cl).
Received January 30 2015. ]]> Accepted April 19 2015.
RESUMEN
Presentamos los resultados de una inspección sistemática de las placas ESO/SRC del hemisferio sur realizada con el propósito de descubrir nuevos sistemas radiales de glóbulos oscuros. Durante esta inspección encontramos 16 sistemas radiales de tipo 1 y 6 sistemas de tipo 2. Con esto, se duplica el número de sistemas radiales conocidos. En la zona central de los sistemas de tipo 1 se encuentran estrellas de tipo espectral O—B2, mientras que los sistemas de tipo 2 no exhiben estrellas de tipo temprano en sus centros. Proponemos una interpretación tentativa de los grupos de cuerpos condensados submilimétricos que no poseen una contraparte estelar como sistemas radiales de glóbulos oscuros situados detrás de nubes oscuras gruesas, lo que explicaría por qué estos glóbulos se observan solamente en longitudes de onda submilimétricas.
ABSTRACT
We present the results of a systematic survey of ESO/SRC plates of the Southern Hemisphere aimed at discovering new radial systems of dark globules. During this survey, we found 16 new type 1 radial systems and 6 type 2 radial systems. We thus doubled the number of known radial systems. O—B2 type stars are situated at the centers of type 1 radial systems, but there are no early-type stars in the centers of type 2 radial systems. An attempt was done to provide an interpretation of the groups of starless condensations as radial systems of dark globules situated behind thick dark clouds, which would explain why these globules are seen only at submillimeter wavelengths.
Key Words: ISM: clouds — ISM: HII regions — stars: early-type — stars: massive — stars: winds, outflows.
DESCARGAR ARTÍCULO EN FORMATO PDF
]]>ACKNOWLEDGMENT
A.L.G. acknowledges support from Project IC120009 Millennium Institute of Astrophysics (MAS) of the Iniciativa Científica Milenio del Ministerio de Economía, Fomento y Turismo de Chile for an extended visist to Chile during 2014. R.A.M. acknowledges support from the Chilean Centro de Excelencia en Astrofísica y Tecnologías Afines (CATA) BASAL PFB/06, and the Project IC120009 Millennium Institute of Astrophysics (MAS) of the Iniciativa Científica Milenio del Ministerio de Economía, Fomento y Turismo de Chile. R.A.M also acknowledges ESO/Chile for hosting him during his sabbatical leave throughout 2014.
REFERENCES
Andre, P. 2007, in IAU Symposium, Triggered Star Formation in a Turbulent ISM, eds. Bruce Elmgreen & Jan Palous (Praga, Czech Republic, Cambridge:CUP), 237, 132 [ Links ]
Enoch, M. L., Young, K. E., Glenn, J., et al. 2006, ApJ, 638, 293 [ Links ]
Gyulbudaghian, A. L., & Akopyan, V. A. 1990, Afz, 33, 528 [ Links ]
Gyulbudaghian, A. L. 1993, Afz, 36, 527 [ Links ]
Gyulbudaghian, A. L. 2010, Afz, 53, 112 [ Links ]
Hawarden, T. G., & Brand, P. W. J. L. 1976, MNRAS, 175, 19 [ Links ]
Herbig, G. H. 1974, PASP, 86, 604 [ Links ]
Johnstone, D., Wilson, C. D., Moriarty-Schieven, G., Joncas, G., Smith, G., Gregersen, E., & Fich, M. 2000, ApJ, 545, 327 [ Links ]
Lada, C. J., Elmegreen, B. G., & Blitz, L. 1978, in IAU Colloq. 52, Protostars and Planets, Tucson: Univ. Ariz. Press, 341 [ Links ]
Motte, F., Andre, P., & Neri, R. 1998, A & A, 336, 150 [ Links ]
Motte, F., Andre, P., Ward-Thompson, D., & Bontemps, S. 2001, A & A, 372, L41 [ Links ]
Reipurth, B. 1983, A & A, 117, 183 [ Links ]
Sandqvist, A. 1976, MNRAS, 177, 69 [ Links ]
Snell, R. L. 1981, ApJS, 45, 121 [ Links ]
Testi, L., & Sargent, A. I. 1998, ApJ, 508, L91 [ Links ]
Ungerechts, H., Winnewisser, G., & Walmsley, C. M. 1982, A & A, 111, 339 [ Links ]
Weaver, H., & Williams, D. R. W. 1973, A & AS, 8, 1 [ Links ]
----------. 1974, A & AS, 17, 251 [ Links ] ]]>