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Strange Among the Strange: The B-emission Star γ Cassiopeiæ

Published online by Cambridge University Press:  12 April 2016

P. Harmanec
P. Harmanec*
Affiliation:
Astronomical Institute of the Charles University, V Holešovičkách 2, CZ-180 00 Praha 8, Bohemia - Czech Republic and Astronomical Institute, Academy of Sciences of the Czech Republic, CZ-251 65 Ondřejov, Bohemia - Czech Republic

Abstract

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γ Cas (HD 5394) is an important representative of Be stars, hot B stars exhibiting Balmer and other emission lines in their spectra at certain epochs. Its emission spectrum was observed as early as in 1863 and has undergone spectacular changes since then. γ Cas is also extremely interesting because it qualifies for several phenomenologically defined groups: it is a light and colour variable, long-term radial-velocity variable, X-ray source, IRAS source, rapid line-profile variable, a single-line spectroscopic binary and a central star of a reflection nebula.

A critical compilation of the wealth of observational data on the star, with emphasis on its time variability on several time scales, as well as an estimate of the most probable values of all basic physical properties of the object is presented. It is pointed out that in spite of a large quantity of data, systematic and well-calibrated observations are still rather rare. The present understanding of the object is put into perspective of the more general – and as yet unsolved – problem of the formation of Be envelopes.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 187: Exotic Stars as Challenges to Evolution , 2002 , pp. 221 - 237
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Baldwin, R.B. 1940, ApJ, 92, 82 Google Scholar
Bates, B., & Halliwell, D.R. 1986, MNRAS, 223, 673 Google Scholar
Beeckmans, F., & Hubert-Delplace, A.M. 1980, A&A, 86, 72 Google Scholar
Berio, P., et al. 1999, A&A, 345, 203 Google Scholar
Birt, W.R. 1832, MNRAS, 2, 79 Google Scholar
Boyarchuk, A.A. 1958a, Izv. Krym, 19, 165 Google Scholar
Boyarchuk, A.A. 1958b, Izv. Krym, 20, 118 Google Scholar
Campbell, W.W., & Moore, J.H. 1928, Publ. Lick Obs., 16, 1 Google Scholar
Chauville, J., Zorec, J., Ballereau, D., Morrell, N., Cidale, L., & Garcia, A. 2001, A&A, 378, 861 Google Scholar
Clarke, D. 1990, A&A, 227, 151 Google Scholar
Cleminshaw, C.H. 1936, ApJ, 83, 495 CrossRefGoogle Scholar
Coe, M.J. 1986, PASP, 98, 334 Google Scholar
Cowley, A.P., Rogers, L., & Hutchings, J.B. 1976, PASP, 88, 911 Google Scholar
Cranmer, S.R., Smith, M.A., & Robinson, R.D. 2000, ApJ, 537, 433 Google Scholar
Curtis, R.H. 1916, Publ. Astron. Obs. Univ. Michigan, 2, 1 Google Scholar
Dal Fiume, D., Frontera, F., Manzo, G., & Robba, R. 1985, IAU Circ., 4131 Google Scholar
Doazan, V., Franco, M., Rusconi, L., Sedniak, G., & Stalio, R. 1984, A&AS, 55, 1 Google Scholar
Doazan, V., Rusconi, L., Sedmak, G., Thomas, R.N., & Bourdonneau, B. 1987, A&A, 182, L25 Google Scholar
Dougherty, S.M., & Taylor, A.R. 1994, MNRAS, 269, 1123 Google Scholar
Edwards, D.L. 1944, MNRAS, 104, 283 Google Scholar
Ferrari-Toniolo, M., Persi, P., & Viotti, R. 1978, MNRAS, 185, 841 Google Scholar
Frontera, F., Dal Fiume, D., Robba, N.R., Manzo, G., Re, S., & Costa, E. 1987, ApJ, 320, L127 Google Scholar
Galkina, T.S. 1981, Izv. Krym, 64, 72 Google Scholar
Galkina, T.S. 1985, Izv. Krym, 72, 72 Google Scholar
Galkina, T.S. 1987, Izv. Krym, 77, 115 Google Scholar
Galkina, T.S. 1992, Izv. Krym, 84, 32 Google Scholar
Galkina, T.S. 1995, Izv. Krym, 93, 102 Google Scholar
Gaze, V.F. 1947, Izv. Krym, 1, 59 Google Scholar
Goraya, P.S. 1980, Ap&SS, 73, 319 Google Scholar
Haberl, F. 1995, A&A, 296, 685 Google Scholar
Harmanec, P. 1987, in IAU Coll. 92, Physics of Be Stars, ed. Slettebak, A. & Snow, T.P. (Cambridge: CUP), 339 Google Scholar
Harmanec, P. 1988, Bull. Astron. Inst. Czech., 39, 329 Google Scholar
Harmanec, P. 1989, Bull. Astron. Inst. Czech., 40, 201 Google Scholar
Harmanec, P. 1998, A&A, 335, 173 Google Scholar
Harmanec, P. 1999, A&A, 341, 867 Google Scholar
Harmanec, P., et al. 2000, A&A 364, L85 Google Scholar
Hartmann, J. 1906, Astr. Nachr., 173, 102 Google Scholar
Heard, J.F. 1938, JRASC, 32, 353 Google Scholar
Henrichs, H.F., Hammerschlag-Hensberge, G., Howarth, I.D., & Barr, P. 1983, ApJ, 268, 807 Google Scholar
Hony, S., et al. 2000, A&A, 355, 187 Google Scholar
Horaguchi, T., et al. 1994, PASJ, 46, 9 Google Scholar
Huffer, C.M. 1939, ApJ, 89, 139 Google Scholar
Hummel, W., & Dachs, J. 1992, A&AS, 262, L17 Google Scholar
Hutchings, J.B. 1970, MNRAS, 150, 55 Google Scholar
Ivanova, Z.K., & Galkina, T.S. 1984, Izv. Krym, 69, 34 Google Scholar
Jarad, M.M. 1987, J. Space and Astron. Research (Baghdad), 4, 87 Google Scholar
Jarad, M.M., Hilditch, R.W., & Skillen, I. 1989, MNRAS, 238, 1085 Google Scholar
Jernigan, J.G. 1976, IAU Circ., 2900 Google Scholar
Konkoly, M. 1883, Magyar Tudományos Akadémia Értekezések A Math. Köréböl (Contr. Hungar. Acad. Sci.) No. 11, 1 Google Scholar
Kubo, S., Murakami, T., Ishida, M., & Corbet, R.H.D. 1998, PASJ, 50, 417 Google Scholar
Lockyer, W.J.S. 1933a, MNRAS, 93, 362 Google Scholar
Lockyer, W.J.S. 1933b, MNRAS, 93, 619 Google Scholar
Lockyer, W.J.S. 1935a, MNRAS, 95, 520 Google Scholar
Lockyer, W.J.S. 1935b, MNRAS, 96, 1 Google Scholar
Lockyer, W.J.S. 1936, MNRAS, 96, 679 Google Scholar
Marchenko, S.V., et al. 1998, A&A, 331, 1022 Google Scholar
Marlborough, J.M. 1977, ApJ, 216, 446 Google Scholar
Marlborough, J.M., Snow, T.P., & Slettebak, A. 1978, ApJ, 224, 157 Google Scholar
Mason, K.O., White, N.E., & Sanford, P.W. 1976, Nature, 260, 690 Google Scholar
McDavid, D. 1999, PASP, 111, 494 Google Scholar
McHardy, I.M. & Pye, J.P. 1981, Space Sci. Rev., 30, 457 Google Scholar
Merrill, P.W. 1913, Lick Obs. Bull., 7, 162 Google Scholar
Murakami, T., Koyama, K., Inoue, H., & Agrawal, P.C. 1986, ApJ, 310, L31 Google Scholar
Ninkov, Z., Yang, S., & Walker, G. 1983, Hvar Obs. Bull., 7, 167 Google Scholar
Owens, A., Oosterbroek, T., Parmar, A.N., Schulz, R., Stüwe, J.A., & Haberl, F. 1999, A&A, 348, 170 Google Scholar
Parmar, A.N., Israel, G.L., Stella, L., & White, N.E. 1993, A&A, 275, 227 Google Scholar
Perryman, M.A.C., Høg, E., Kovalevsky, J., Lindegren, L., & Turon, C. 1997, ESA SP-1200: The Hipparcos and Tycho CataloguesGoogle Scholar
Peters, G.J. 1982, PASP, 94, 157 Google Scholar
Piirola, V. 1979, A&AS, 38, 193 Google Scholar
Poeckert, R., & Marlborough, M. 1977, ApJ, 218, 220 Google Scholar
Poeckert, R., & Marlborough, M. 1978, ApJ, 220, 940 Google Scholar
Poeckert, R., & van den Bergh, S. 1981, PASP, 93, 703 CrossRefGoogle Scholar
Pollmann, E. 2002, Be Star Newsletter, 35, 13 Google Scholar
Pottasch, S.R. 1959, Nat. Bur. Standards, US Dept. of Commerce, Technical Note No. 21, 1Google Scholar
Prinja, R.K. 1988, MNRAS, 231, 21P Google Scholar
Quirrenbach, A., Hummel, C.A., Buscher, D.F., Armstrong, J.T., Mozurkewich, D., & Elias, N.M. II, 1993, ApJ, 416, L25 Google Scholar
Quirrenbach, A., Bjorkman, J.E., Hummel, C.A., Buscher, D.F., Armstrong, J.T., Mozurkewich, D., Elias, N.M. II, & Babler, B.L. 1997, ApJ, 479, 477 Google Scholar
Rinehart, S.A., Houck, J.R., & Smith, J.D. 1999, AJ, 118, 2974 Google Scholar
Robinson, R.D., & Smith, M.A. 2000, ApJ, 540, 474 Google Scholar
Robinson, R.D., Smith, M.A., & Henry, G.W. 2002, ApJ, 575, 435 Google Scholar
Schaller, G., Schaerer, D., Meynet, G., & Maeder, A. 1992 A&AS, 96, 269 Google Scholar
Secchi, A. 1867a, Mem. Mat. Fis. Soc. Ital. Sci., 3rd Ser., Vol. 1, Part I, 67 Google Scholar
Secchi, A. 1867b, Astron. Nachr., 68, 63 Google Scholar
Sidgreaves, W. 1899, MNRAS, 59, 505 & 508Google Scholar
Slettebak, A. 1982, ApJS, 50, 55 Google Scholar
Slettebak, A., & Snow, T.P. 1978, ApJ, 224, L127 Google Scholar
Smith, M.A. 1995, ApJ, 442, 812 Google Scholar
Smith, M.A., & Robinson, R.D. 1999, ApJ, 517, 866 Google Scholar
Smith, M.A., Robinson, R.D., & Corbet, R.H.D. 1998, ApJ, 503, 877 Google Scholar
Smith, M.A., Robinson, R.D., & Hatzes, A.P. 1998, ApJ, 507, 945 Google Scholar
Snow, R. 1840, MNRAS, 5, 10 Google Scholar
Stee, P., & Bittar, J. 2001, A&A, 367, 532 Google Scholar
Stee, P., Vakili, F., Bonneau, D., & Mourand, D. 1998, A&A, 332, 268 Google Scholar
Telting, J.H., & Kaper, L. 1994, A&A, 284, 515 Google Scholar
Telting, J.H., Waters, L.B.F.M., Persi, P., & Dunlop, S.R., 1993, A&A, 270, 355 Google Scholar
Thom, C., Granes, P., & Vakili, F. 1986, A&A, 165, L13 Google Scholar
Waters, L.B.F.M., van der Heuvel, W.E.C.J., Taylor, A.R., Marlborough, J.M., & Dougherty, S.M. 1991, A&A, 244, 120 Google Scholar
White, N.E., Swank, J.H., & Holt, S.S. 1982, ApJ, 263, 277 Google Scholar
Yang, S., Ninkov, Z., & Walker, G.A.H. 1988, PASP, 100, 233 Google Scholar