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Polarimetry as a Diagnostic of Circumstellar Envelopes

Published online by Cambridge University Press:  12 April 2016

Karen S. Bjorkman
Karen S. Bjorkman*
Affiliation:
Ritter Observatory, Dept. of Physics & Astronomy, University of Toledo, Toledo, OH 43606, USA

Abstract

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Polarimetric observations of stars can provide useful diagnostics of the geometry and physical conditions of the circumstellar envelope. This paper reviews the application of polarimetric techniques to hot stars (with particular emphasis on Be stars) and the status of polarization observations, and discusses some recent developments that improve our ability to make and to interpret such observations. Polarization measurements, bolstered by the increasing availability of new instruments on larger telescopes, continue to improve toward both higher signal-to-noise ratio and higher spectral resolution. Because of this we can begin to address specific questions of the physics of the circumstellar envelopes, since polarization provides a means to separate the effects of the photosphere from those of the envelope. New theoretical and analytic approaches are improving our ability to interpret spectropolarimetric data. We now are able to determine characteristics such as disk opening angle, density, and temperature. Furthermore, polarimetric observations in new wavelength regimes (e.g. ultraviolet and infrared) are opening new avenues to investigate circumstellar disks. The combination of spectropolarimetry with other kinds of data, such as spectroscopy, photometry, and interferometry, shows promise for providing stringent tests for theoretical models of the circumstellar envelopes of Be stars.

Type
6. Disks
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 384 - 395
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Abbott, D.C. 1982, ApJ, 259, 282 CrossRefGoogle Scholar
Barker, P.K., Landstreet, J.D., Marlborough, J.M., and Thompson, I.B. 1985, ApJ, 288, 741 Google Scholar
Bjorkman, K.S. 1994, Ap&SS, 221, 335.Google Scholar
Bjorkman, K.S., & Schulte-Ladbeck, R.E. 1994, in ASP Conf. Ser. Vol. 62, the Nature and Evolutionary Status of Herbig Ae/Be Stars, ed. Thé, P.S., Pérez, M.R., & van den Heuvel, E.P.J. (San Francisco: ASP), 74 Google Scholar
Bjorkman, K.S. et al. 1991, ApJ, 383, L67 CrossRefGoogle Scholar
Bjorkman, K.S. et al. 1993, ApJ, 412, 810 CrossRefGoogle Scholar
Capps, R.W., Coyne, G.V., & Dyck, H.M. 1973, ApJ, 184, 173 Google Scholar
Coyne, G.V. 1976, in IAU Symp. 70, Be and Shell Stars, ed. Slettebak, A.(Dordrecht: Reidel), p. 233 CrossRefGoogle Scholar
Coyne, G.V., et al. 1988, Polarized Radiation of Circumstellar Origin (Vatican:Vatican Observatory)Google Scholar
Coyne, G.V., & McLean, I.S. 1982, in IAU Symp. 98, Be Stars, ed. Jaschek, M. & Groth, H.-G. (Dordrecht: Reidel), p. 77 Google Scholar
Gehrels, T. 1974, Planets, Stars, and Nebulae Studied with Photopolarimetry (Tucson: University of Arizona Press)Google Scholar
Grinin, V.I. 1994, in ASP Conf. Ser. Vol. 62, The Nature and Evolutionary Status of Herbig Ae/Be Stars, ed. Thé, P.S., Pérez, M.R., & van den Heuvel, E.P.J. (San Francisco: ASP), 63 Google Scholar
Harries, T.J., Hillier, D.J., and Howarth, I.D., 1998, MNRAS, 296, 1072 CrossRefGoogle Scholar
Harries, T.J., & Howarth, I.D. 1996, A&A, 310, 533 Google Scholar
Hayes, D.P. 1980, PASP, 92, 661 CrossRefGoogle Scholar
Hayes, D.P. 1984, AJ, 89, 1219 Google Scholar
Hayes, D.P. 1985, ApJ, 289, 726 CrossRefGoogle Scholar
Hayes, D.P. 1986, ApJ, 302, 403 Google Scholar
Hoffman, J.L., Nordsieck, K.H., & Fox, G.K. 1998, AJ, 115, 1576 CrossRefGoogle Scholar
Ignace, R., Cassinelli, J.P., & Bjorkman, J.E. 1996, ApJ, 459, 671 Google Scholar
Ignace, R., Cassinelli, J.P., & Nordsieck, K.H. 1999, ApJ, 520, 335 Google Scholar
Ignace, R., Nordsieck, K.H., & Cassinelli, J.P. 1997, ApJ, 486, 550 CrossRefGoogle Scholar
Lupie, O.L., & Nordsieck, K.H. 1987, AJ, 93, 214 CrossRefGoogle Scholar
Magalhães, A.M. 1992, ApJ, 398, 286 Google Scholar
McLean, I.S. 1979, MNRAS, 186, 265 CrossRefGoogle Scholar
McLean, I.S. & Brown, J.C. 1978, A&A, 69, 291 Google Scholar
McLean, I.S. & Clarke, D. 1979, MNRAS, 186, 245 CrossRefGoogle Scholar
McLean, I.S. et al. 1979, ApJ, 228, 802 Google Scholar
McDavid, D. 1990, PASP, 102, 773 Google Scholar
McDavid, D. 1994, PASP, 106, 949 Google Scholar
McDavid, D. 1999, PASP, 111, 494 Google Scholar
Nordsieck, K.H. et al. 1992, in ASP Conf. Ser. Vol. 22, Non-isotropie and Variable Outflows from Stars, ed. Drissen, L., Leitherer, C., & Nota, A. (San Francisco: ASP), 114 Google Scholar
O’Connor, J.A., Meaburn, J., & Bryce, M. 1998, MNRAS, 300, 411 Google Scholar
Oudmaijer, R.D. & Drew, J.E. 1999, MNRAS, 305, 166 Google Scholar
Poeckert, R., Bastien, P., & Landstreet, J.D. 1979, AJ, 84, 812 Google Scholar
Poeckert, R., & Marlborough, J.M. 1976, ApJ, 206, 182 Google Scholar
Poeckert, R., & Marlborough, J.M. 1977, ApJ, 218, 220 CrossRefGoogle Scholar
Poeckert, R., & Marlborough, J.M. 1978a, ApJ, 220, 940 Google Scholar
Poeckert, R., & Marlborough, J.M. 1978b, ApJS, 38, 229 Google Scholar
Poeckert, R., & Marlborough, J.M. 1979, ApJ, 233, 259 Google Scholar
Quirrenbach, A. et al. 1993, ApJ, 416, L25 CrossRefGoogle Scholar
Quirrenbach, A. et al. 1994, A&A, 283, L13 Google Scholar
Quirrenbach, A. et al. 1997, ApJ, 479, 477 Google Scholar
Robert, C. et al. 1990, ApJ, 359, 211 CrossRefGoogle Scholar
Roche, P. et al. 1997, A&A, 322, 139 Google Scholar
Schulte-Ladbeck, R.E. 1995, in IAU Symp. 163, Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution, ed. van der Hucht, K.A. and Williams, P.M. (Dordrecht: Kluwer), p.176 CrossRefGoogle Scholar
Schulte-Ladbeck, et al. 1990, ApJ, 365, L19 CrossRefGoogle Scholar
Taylor, M. et al. 1991, AJ, 102, 1197 CrossRefGoogle Scholar
Thom, C., Granes, P., & Vakili, F. 1986, A&A, 165, L13 Google Scholar
Vakili, F. et al. 1997, A&A, 323, 183 Google Scholar
Vrba, F.J., Schmidt, G.D., & Hintzen, P.M. 1979, ApJ, 227, 185 Google Scholar
Wood, K., & Bjorkman, J.E. 1995, ApJ, 443, 348 CrossRefGoogle Scholar
Wood, K., Bjorkman, K.S., & Bjorkman, J.E. 1997, ApJ, 477, 926 Google Scholar
Yudin, R.V., & Evans, A. 1998, A&AS, 131, 401 Google Scholar
Zickgraf, F.-J., & Schulte-Ladbeck, R.E. 1989, A&A, 214, 274 Google Scholar