[en] We present infrared photometry of the episodic dust-making Wolf-Rayet system WR19 (LS3), tracking its fading from a third observed dust formation episode in 2007 and strengthening the view that these episodes are periodic (P = 10.1 +/- 0.1y). Radial velocities (RVs) of the O9 component observed between 2001 and 2008 show RV variations consistent with WR19 being a spectroscopic binary of high eccentricity (e = 0.8), having periastron passage in 2007.14, shortly before the phase of dust formation. In this respect, WR19 resembles the archetypical episodic dust-making colliding wind binary system WR140. Based on observations collected at the European Southern Observatory, La Silla, Chile, in allocations 67.D-0043, 70.D-0266, 72.D-0070, 73.D-0027, 74.D-0116, 76.D-0029, 78.D-0001, 79.D-0092 and 80.D-0198. E-mail: pmw@roe.ac.uk
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Williams, P. M.; Institute for Astronomy, Scottish Universities Physics Alliance, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ
Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
van der Hucht, K. A.; Space Research Organization Netherlands, Sorbonnelaan 2, NL-3584CA Utrecht, the Netherlands ; Astronomical Institute `Anton Pannekoek', University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam, the Netherlands
Language :
English
Title :
Dust formation by the colliding wind WC5+O9 binary WR19 at periastron passage
Bieging J. H., Abbott D. C., Churchwell E. B., 1982, ApJ, 263, 207
Cappa C., Goss W. M., Van Der Hucht K. A., 2004, AJ, 127, 2885
Chapman J. M., Leitherer C., Koribalski B., Bouter R., Storey M., 1999, ApJ, 518, 890
Crowther P. A., De Marco O., Barlow M. J., 1998, MNRAS, 296, 367
Dougherty S. M., Beasley A. J., Claussen M. J., Zauderer A., Bolingbroke N. J., 2005, ApJ, 623, 447
Epchtein N. et al., 1999, A&A, 349, 236
Lefèvre L. et al., 2005, MNRAS, 360, 141
Leitherer C., Chapman J. M., Koribalski B., 1997, ApJ, 481, 898
Marchenko S. V. et al., 2003, ApJ, 596, 1295
Monnier J. D., Tuthill P. G., Danchi W. C., 1999, ApJ, 525, L97
Monnier J. D., Tuthill P. G., Danchi W. C., 2002, ApJ, 567, L137
Pollock A. M. T., Haberl F., Corcoran M. F., 1995, in Van Der Hucht K. A., Williams P. M., eds, Proc. IAU Symp. 163, Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution. Kluwer, Dordrecht, p. 512
Skrutskie M. F. et al., 2006, AJ, 131, 1163
Smith L. F., 1968, MNRAS, 138, 109
Smith L. F., Hummer D. G., 1988, MNRAS, 230, 511
Smith L. F., Shara M., Moffat A. F. J., 1990a, ApJ, 348, 471
Smith L. F., Shara M., Moffat A. F. J., 1990b, ApJ, 358, 229
Tuthill P. G., Monnier J. D., Danchi W. C., 1999, Nat, 398, 486
Usov V. V., 1991, MNRAS, 252, 49
Van Der Hucht K. A., 2001, New Astron. Rev., 45, 135
Van Der Hucht K. A., Conti P. S., Lundström I., Stenholm B., 1981, Spa. Sci. Rev., 28, 227
Varricatt W. P., Williams P. M., Ashok N. M., 2004, MNRAS, 351, 1307
Veen P. M., Van Der Hucht K. A., Williams P. M., Catchpole R. M., Duijsens M. F. J., Glass I. S., Setia Gunawan D. Y. A., 1998, A&A, 339, L45 (Paper 2)
Walborn N. R., Fitzpatrick E. L., 1990, PASP, 102, 379
Williams P. M., 1982, in de Loore C. W. H., Willis A. J., eds, Proc. IAU Symp. 99, Wolf-Rayet Stars: Observations, Physics, Evolution. Reidel, Dordrecht, p. 73
Williams P. M., 1999, in Van Der Hucht K. A., Koenigsberger G., Eenens P. R. J., eds, Proc. IAU Symp. 193, Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies. Astron. Soc. Pac., San Francisco, p. 267
Williams P. M., Van Der Hucht K. A., Pollock A. M. T., Florkowski D. R., Van Der Woerd H., Wamstecker W. M., 1990a, MNRAS, 243, 662
Williams P. M., Van Der Hucht K. A., Thé P. S., Bouchet P., 1990b, MNRAS, 247, 18 p (Paper 1)
Williams P. M. et al., 2001, MNRAS, 324, 156
Williams P. M., Varricatt W. P., Marston A. R., Ashok N. M., 2007, in St-Louis, N., Moffat, A. F. J., eds, ASP Conf. Ser. Vol. 367, Massive Stars in Interacting Binaries. Astron. Soc. Pac., San Francisco, p. 285