Publication: Low-resolution spectroscopy and spectral energy distributions of selected sources towards σ Orionis
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2008-11
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Caballero, J. A.
Valdivielso, L.
Martín, E. L.
Pascual, S.
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Aims. We study in detail nine sources in the direction of the young σ Orionis cluster, which is considered to be a unique site for studying stellar and substellar formation. The nine sources were selected because of their peculiar properties, such as extremely-red infrared colours or excessively strong Hα emission for their blue optical colours. Methods. We acquired high-quality, low-resolution spectroscopy (R ∼ 500) of the nine targets with ALFOSC at the Nordic Optical Telescope. We also re-analysed [24]-band photometry from MIPS/Spitzer and compiled the highest quality photometric dataset available at the ViJHK_s passbands and the four IRAC/Spitzer channels, for constructing accurate spectral energy distributions between 0.55 and 24 μm. Results.
The nine targets were classified into: one Herbig Ae/Be star with a scattering edge-on disc; two G-type stars; one X-ray flaring, early-M, young star with chromospheric Hα emission; one very low-mass, accreting, young spectroscopic binary; two young objects at the brown-dwarf boundary with the characteristics of classical T Tauri stars; and two emission-line galaxies, one undergoing star formation, and another whose spectral energy distribution is dominated by an active galactic nucleus. We also discovered three infrared sources associated with overdensities in a cold cloud of the cluster centre. Conclusions. Low-resolution spectroscopy and spectral energy distributions are a vital tool for measuring the physical properties and evolution of young stars and candidates in the σ Orionis cluster.
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© ESO 2008.
We thank the anonymous referee, G. Barro Calvo, M. Rego, V. Villar, and J. Zamorano for helpful comments. The data presented here have been taken using ALFOSC, which is owned by the Instituto de Astrofísica de Andalucía (IAA) and operated at the Nordic Optical Telescope under agreement between IAA and the NBIfAFG of the Astronomical Observatory of Copenhagen. Partial financial support was provided by the Universidad Complutense de Madrid, the Spanish Virtual Observatory, the Spanish Ministerio Educación y Ciencia, and the European Social Fund under grants AyA2005-02750, AyA2005-04286, AyA2005-24102-E, and AyA2007-67458 of the Programa Nacional de Astronomía y Astrofísica and by the Comunidad Autónoma de Madrid under PRICIT project S-0505/ESP-0237 (AstroCAM).
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Andrews, S. M., Reipurth, Bo, Bally, J., & Heathcote, S. R. 2004, ApJ, 606, 353
Bahcall, J. N., & Soneira, R. M. 1980, ApJS, 44, 73
Barrado y Navascués, D., & Martín, E. L. 2003, AJ, 126, 2997
Barrado y Navascués, D., Zapatero Osorio, M. R., Béjar, V. J. S., et al. 2001, A&A, 377, L9
Béjar, V. J. S., Zapatero Osorio, M. R., & Rebolo, R. 1999, ApJ, 521, 671
Béjar, V. J. S., Martín, E. L., Zapatero Osorio, M. R., et al. 2001, ApJ, 556, 830
Béjar, V. J. S., Zapatero Osorio, M. R., & Rebolo, R. 2004, AN, 325, 705
Bibo, E. A., & Thé, P. S. 1991, A&AS, 89, 319
Bouy, H., Huélamo, N., Martín, E. L., et al. 2008, A&A, in press, [arXiv:0808.3890]
Caballero, J. A. 2005, AN, 326, 1007
Caballero, J. A. 2006, Ph.D. Thesis, Universidad de La Laguna, Spain
Caballero, J. A. 2007a, A&A, 466, 917
Caballero, J. A. 2007b, AN, 328, 917
Caballero, J. A. 2008a, MNRAS, 383, 375
Caballero, J. A. 2008b, MNRAS, 383, 750
Caballero, J. A. 2008c, A&A, 478, 667
Caballero, J. A., Béjar, V. J. S., Rebolo, R., & Zapatero Osorio, M. R. 2004, A&A, 424, 857
Caballero, J. A., Martín, E. L., Zapatero Osorio, M. R., et al. 2006, A&A, 445, 143
Caballero, J. A., Béjar, V. J. S., Rebolo, R., et al. 2007, A&A, 470, 903
Caballero, J. A., Barrado y Navascués, D., Béjar, V. J. S., et al. 2008, 14th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun ASP Conf. Ser., 384, Proceedings of the conference held 5–10 November, 2006, at the Spitzer Science Center and Michelson Science Center, Pasadena, California, USA, ed. G. van Belle, Poster #31 (in DVD).
Danks, A. C., & Dennefeld, M. 1994, PASP, 106, 382
Downes, R. A., & Keyes, C. D. 1988, AJ, 96, 777
Engelbracht, C. W., Blaylock, M., Su, K. Y. L., et al. 2007 PASP, 119, 994
Epchtein, N., de Batz, B., Capoani, L., et al. 1997, Msngr, 87, 27
European Space Agency (ESA), The Hipparcos and Tycho catalogues, ESA SP-1200, 1997
Feigelson, E. D., Broos, P., Gaffney, J. A., III, et al. 2002 ApJ, 574, 258
Franciosini, E., Pallavicini, R., & Sanz-Forcada, J. 2006 A&A, 446, 501
Gatti, T., Natta, A., Randich, S., Testi, L., & Sacco, G. 2008, A&A, 481, 423
González García, B. M., Zapatero Osorio, M. R., Béjar, V. J. S., et al. 2006, A&A, 460, 799
Güdel, M., Schmitt, J. H. M. M., Benz, A. O., & Elias, N. M., II 1995, A&A, 301, 201
Hernández, J., Hartmann, L., Megeath, T., et al. 2007, ApJ, 662, 1067
Høg, E., Fabricius, C., Makarov, V. V., et al. 2000, A&A, 355, L27
Jacoby, G. H., Hunter, D. A., & Christian, C. A. 1984, ApJS, 56, 257
Kenyon, S. J., & Hartmann, L. 1995, ApJS, 101, 117
Kenyon, M. J., Jeffries, R. D., Naylor, T., Oliveira, J. M., & Maxted, P. F. L. 2005, MNRAS, 356, 89
Lee, T. A. 1968, ApJ, 152, 913
Leggett, S. K., Allard, F., Geballe, T. R., Hauschildt, P. H., & Schweitzer, A. 2001, ApJ, 548, 908
van Loon, J. Th., & Oliveira, J. M. 2003, A&A, 405, L33
López Santiago, J., & Caballero J. A. 2008, A&A, in press, doi: 10.1051/0004-6361:200810475
Luhman, K. L., Hernández J., Downes, J. J., Hartmann, L., & Briceño, C. 2008, ApJ, in press, [arXiv:0808.0471]
Martín, E. L., & Kun, M. 1996, A&AS, 116, 467
Martín, E. L., Rebolo, R., & Zapatero Osorio, M. R. 1996, ApJ, 469, 706
Martín, E. L., Zapatero Osorio, M. R., Barrado y Navascués, D., Béjar, V. J. S., & Rebolo, R. 2001a, ApJ, 558, L117
Martín, E. L., Dougados, C., Magnier, E., et al. 2001b, ApJ, 561, L195
Maxted, P. F. L., Jeffries, R. D., Oliveira, J. M., Naylor, T., & Jackson, R. J. 2008, MNRAS, 385, 2210
Mayne, N. J., & Naylor, T. 2008, MNRAS, 386, 261
Monet, D. G., Levine, S. E., Canzian, B., et al. 2003, AJ, 125, 984
Montes, D., Martín, E. L., Fernández Figueroa, M. J., Cornide, M., & de Castro, E. 1997, A&AS, 123, 473
Oliveira, J. M., Jeffries, R. D., van Loon, J. Th., & Rushton, M. T. 2006, MNRAS, 369, 272
Pojmański, G. 2002, AcA, 52, 397
Reipurth, Bo, Bally, J., Fesen, R. A., & Devine, D. 1998 Nature, 396, 343
Robrade, J., & Schmitt, J. H. M. M. 2005, A&A, 435, 1073
ROSAT Consortium 2000, VizieR On-line Data Catalog: IX/30, originally published in: ROSAT News 72, 25-May-2000
Sacco, G. G., Franciosini, E., Randich, S., & Pallavicini, R. 2008, A&A, 488, 167
Sanz Forcada, J., Franciosini, E., & Pallavicini, R. 2004, A&A, 421, 715
Scholz, A., & Eislöffel, J. 2004 A&A, 419, 249
Scholz, A., & Jayawardhana, R. 2008 ApJ, 672, L49
Sherry, W. H., Walter, F. M., & Wolk, S. J. 2004, AJ, 128, 2316
Sherry, W. H., Walter, F. M., Wolk, S. J., & Adams, N. R. 2008, AJ, 135, 1616
Skinner, S. L., Sokal, K. R., Cohen, D. H., et al. 2008, ApJ, 683, 796
Skrutskie, M. F., Cutri, R. M., Stiening, R., et al. 2006, AJ, 131, 1163
Stelzer, B., Micela, G., & Neuhäuser, R. 2004, A&A, 423, 1029
Stephenson, C. B. 1986, ApJ, 300, 779
Thé, P. S., de Winter, D., & Pérez, M. R. 1994, A&AS, 104, 315
Turner, N. H., ten Brummelaar, T. A., Roberts, L. C., et al. 2008, AJ, 136, 554
Valdes, F., Gupta, R., Rose, J. A., Singh, H. P., & Bell, D. J. 2004, ApJS, 152, 251
White, N. E., Giommi, P., & Angelini, L. 2000, VizieR On-line Data Catalog: IX/31, originally published in: Laboratory for High Energy Astrophysics (LHEA/NASA), Greenbelt (2000)
White, R. J., & Basri, G. 2003, ApJ, 582, 1109
Wolk, S. J. 1996, Ph.D. Thesis, State University New York at Stony Brook, USA
Zamorano, J., Rego, M., Gallego, J. G., et al. 1994, ApJS, 95, 387
Zapatero Osorio, M. R., Béjar, V. J. S., Martín, E. L., et al. 2000, Science, 290, 103
Zapatero Osorio, M. R., Béjar, V. J. S., Pavlenko, Ya., et al. 2002a, A&A, 384, 937
Zapatero Osorio, M. R., Béjar, V. J. S., Martín, E. L., Barrado y Navascués, D., & Rebolo, R. 2002b, ApJ, 569, L99
Zapatero Osorio, M. R., Béjar, V. J. S., Martín, E. L., et al. 2002c, ApJ, 578, 536
Zapatero Osorio, M. R., Caballero, J. A., Béjar, V. J. S., et al. 2007, A&A, 472, L9
Zinnecker, H., & Yorke, H. W. 2007, ARA&A, 45, 481