Publication: The magnetically-active, low-mass, triple system WDS 19312+3607 (Research Note)
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2010-09
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Caballero, J. A.
Klutsch, A.
Genebriera, J.
Miret, F. X.
Tobal, T.
Cairol, J.
Pedraz, S.
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Aims. We investigated in detail the system WDS 19312+3607, whose primary is an active M4.5Ve star previously inferred to be young (τ ~ 300–500 Ma) based on its high X-ray luminosity. Methods. We collected intermediate- and low-resolution optical spectra taken with 2 m-class telescopes, photometric data from the B to 8 μm bands, and data for eleven astrometric epochs with a time baseline of over 56 years for the two components in the system, G 125–15 and G 125–14. Results. We derived the M4.5V spectral types of both stars, confirmed their common proper motion, estimated their heliocentric distance and projected physical separation, determined their Galactocentric space velocities, and deduced a most-probable age of older than 600 Ma. We discovered that the primary, G 125–15, is an inflated, double-lined, spectroscopic binary with a short period of photometric variability of 1.6 d, which we associated with orbital synchronisation. The observed X-ray and Hα emissions, photometric variability, and abnormal radius and effective temperature of G 125–15 AB are indicative of strong magnetic activity, possibly because of the rapid rotation. In addition, the estimated projected physical separation between G 125–15 AB and G 125–14 of about 1200 AU ensures that WDS 19312+3607 is one of the widest systems with intermediate M-type primaries. Conclusions. G 125–15 AB is a nearby (d ≈ 26 pc), bright (J ≈ 9.6 mag), active spectroscopic binary with a single proper-motion companion of the same spectral type at a wide separation. They are thus ideal targets for specific follow-ups to investigate wide and close multiplicity or stellar expansion and surface cooling because of the lower convective efficiency.
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© ESO, 2010.
We thank the anonymous referee for helpful comments and P. G. Pérez González for software help. Based on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut fur Astronomie and the Instituto de Astrofísica de Andalucía. Based on observations made with the Isaac Newton Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. This research made use of the SIMBAD, operated at Centre de Données astronomiques de Strasbourg, France, and NASA's Astrophysics Data System. Financial support was provided by the Universidad Complutense de Madrid, the Comunidad Autónoma de Madrid, and the Spanish Ministerio de Ciencia e Innovación under grants AyA2008-00695, AyA2008-06423-C03-03, and SP2009/ESP-1496.
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Abazajian, K. N., Adelman-McCarthy, J. K., Agüeros, M. A., et al. 2009, ApJS, 182, 543
Allen, P. R., & Reid, I. N. 2008, AJ, 135, 2024
Artigau, É., Lafrenière, D., Doyon, R., et al. 2007, ApJ, 659, L49
Baraffe, I., Chabrier, G., Allard, F., & Hauschildt, P. H. 1998, A&A, 337, 403
Caballero, J. A. 2007, A&A, 462, L61
Caballero, J. A. 2009, A&A, 507, 251
Caballero, J. A. 2010, A&A, 514, A18
Caballero, J. A., Burgasser, A. J., & Klement, R. 2008, A&A, 488, 181
Caballero, J. A., Miret, F. X., Genebriera, J., et al. 2010, in Highlights of Spanish Astrophysics V, Astrophysics and Space Science Proceedings (Berlin, Heidelberg: Springer-Verlag), 379
Cardiel, N. 1999, Ph.D. Thesis, Universidad Complutense de Madrid, Spain
Chabrier, G., & Baraffe, I. 1995, ApJ, 451, L29
Chabrier, G., Gallardo, J., & Baraffe, I. 2007, A&A, 472, L17
Cruz, K. L., Reid, I. N., Liebert, J., Kirkpatrick, J. D., & Lowrance, P. J. 2003, AJ, 126, 2421
Daemgen, S., Siegler, N., Reid, I. N., & Close, L. M. 2007, ApJ, 654, 558
Doyle, L. R., Deeg, H. J., Kozhevnikov, V. P., et al. 2000, ApJ, 535, 338
Fuhrmeister, B., & Schmitt, J. H. M. M. 2003, A&A, 403, 247
Giclas, H. L., Burnham, R., & Thomas, N. G. 1971, Lowell proper motion survey Northern Hemisphere, The G numbered stars, 8991 stars fainter than magnitude 8 with motions >0''. 26/year, Flagstaff, Arizona, Lowell Observatory
Hambly, N. C., MacGillivray, H. T., Read, M. A., et al. 2001, MNRAS, 326, 1279
Hanson, R. B., Klemola, A. R., Jones, B. F., & Monet, D. G. 2004, AJ, 128, 1430
Hartman, J. D., Bakos, G., Stanek, K. Z., & Noyes, R. W. 2004, AJ, 128, 1761
Hawley, S. L., Covey, K. R., & Knapp, G. R. 2002, AJ, 123, 3409
Henry, T. J., Kirkpatrick, J. D., & Simons, D. A. 1994, AJ, 108, 1437
Høg, E., Fabricius, C., Makarov, V. V., et al. 2000, A&A, 355, L27
Ivanov, G. A. 2008, KFNT, 24, 480, VizieR on-line data catalogue: I/306A
Joy, A. H. 1947, ApJ, 105, 96
Lacy, C. H. 1977, ApJS, 34, 479
Leggett, S. K. 1992, ApJS, 82, 351
Lépine, S., & Shara, M. M. 2005, AJ, 129, 1483
López Morales, M. 2007, ApJ, 660, 732
Luyten, W. J. 1979, LHS catalogue. A catalogue of stars with proper motions exceeding 0''.5 annually, Minneapolis, University of Minnesota, 2nd edn.
Martín, E. L., Delfosse, X., Basri, G., et al. 1999, AJ, 118, 2466
Metcalfe, T. S., Mathieu, R. D., Latham, D. W., & Torres, G. 1996, ApJ, 456, 356
Montes, D., López Santiago, J., & Gálvez, M. C. 2001, MNRAS, 328, 45
Morales, J. C., Ribas, I., & Jordi, C. 2008, A&A, 478, 507
Morales, J. C., Ribas, I., Jordi, C., et al. 2009, ApJ, 691, 1400
Muiños, J. L. 2006, On behalf of the Carlsberg Meridian Catalog Number 14 team, VizieR on-line catalogue I/304
Mullan, D. J., & MacDonald, J. 2001, ApJ, 559, 353
Phan-Bao, N., & Bessell, M. S. 2006, A&A, 446, 515
Radigan, J., Lafrenière, D., Jayawardhana, R., & Doyon, R. 2009, ApJ, 698, 405
Reid, I. N., Cruz, K. L., Allen, P., et al. 2004, AJ, 128, 463
Reiners, A., Seifahrt, A., Stassun, K. G., Melo, C., & Mathieu, R. D. 2007, ApJ, 671, L149
Salim, S., & Gould, A. 2003, ApJ, 582, 1011
Scholz, R.-D., Meusinger, H., & Jahreiβ, H. 2005, A&A, 442, 211
Skrutskie, M. F., Cutri, R. M., Stiening, R., et al. 2006, AJ, 131, 1163
Stassun, K. G., Mathieu, R. D., & Valenti, J. A. 2006, Nature, 440, 311
Stassun, K. G., Mathieu, R. D., & Valenti, J. A. 2007, ApJ, 664, 1154
Stauffer, J. R., & Hartmann, L. W. 1986, ApJS, 81, 531
Torres, G., & Ribas, I. 2002, ApJ, 567, 1140
Vilhu, O., Ambruster, C. W., Neff, J. E., et al. 1989, A&A, 222, 179
Viti, S., Jones, H. R. A., Schweitzer, A., et al. 1997, MNRAS, 291, 780
Weis, E. W. 1996, AJ, 112, 2300
Whitworth, A. P., & Stamatellos, D. 2006, A&A, 458, 817
Worley, C. E., & Douglass, G. G. 1997, A&AS, 125, 523