References

• Bateson F.M., 1987-1990, Circ. Roy. Astron. Soc. New Zealand
• Bond H.E., Landolt A.U., 1970, PASP 82, 313 NASA ADS
• Feast M.W., Thackaray A.D., Wesselink A.J., 1960, MNRAS 121, 337 NASA ADS
• Gallagher J.S., 1992, in Nonisotropic and Variable Outflows from Stars, Drissen L., Leitherer C., Nota A. (eds.) ASP Conf. Ser. 22, 339
• van Genderen A.M., 1970, A&A 7, 49 NASA ADS
• van Genderen A.M., 1979, A&AS 38, 381 NASA ADS
• van Genderen A.M., 1991, in ESO Workshop on Rapid Variability of OB-Stars: Nature and Diagnostic Value, Baade D. (ed.). Garching, p. 117
• van Genderen A.M., van Leeuwen F., Brand J., 1982, A&AS 47, 591 NASA ADS
• van Genderen A.M., Steemers W.J.G., Feldbrugge P.T.M., et al., 1985, A&A 153, 163 NASA ADS
• van Genderen A.M., Thé P.S., Augusteijn Th., et al., 1988, A&AS 74, 453 NASA ADS
• van Genderen A.M., Thé P.S., Heemskerk M., et al., 1990, A&AS 82, 189 NASA ADS
• van Genderen A.M., Sterken C., de Groot M., 1996, A&A (in press) (Paper I)
• Graham J.A., 1968, BAN Suppl. 2, 397
• de Groot M., van Genderen A.M., Sterken C., 1996, Irish AJ 23 (2), 187
• Hillendahl R.W., 1970, Symp. on Spectrum Formation in Stars with Steady-State Extended Atmospheres, NSB-Special Publ. 332-300
• Hoffleit D., 1940, Harv.Bull. 913, 4
• Hutsemékers D., van Drom E., 1991, A&A 248, 141 NASA ADS
• Israelian G., de Groot M., Parker J.Wm., et al., 1996, A&A (in press)
• Isserstedt, J., 1975, A&AS 19, 259 NASA ADS
• de Jager C., van Genderen A.M., 1989, in IAU Coll. 113, Physics of Luminous Blue Variables, Davidson K., Moffat A.F.J., Lamers H.J.L.G.M. (eds.). Kluwer, p. 127
• de Jager C., de Koter A., Carpay J., et al., 1991, A&A 244, 131 NASA ADS
• Kilkenny D., Whittet D.C.B., Davies J.K., et al., 1985, SAAO Circ. 9, 55
• de Koter A., Lamers H.J.G.L.M., Schmutz W., 1996, A&A 306, 501 NASA ADS
• Lamers H.J.G.L.M., 1995, in IAU Coll. 155, Astrophysical Applications of Stellar Pulsations, ASP Conf. Ser. 83, Stobie R.S., Whitelock P.A. (eds.) p. 176
• Leitherer C., Appenzeller I., Klare G., et al., 1985, A&A 153, 168 NASA ADS
• Manfroid J., Sterken C., Bruch A., et al., 1991, First Cat. Stars Measured in the LTPV Project (1982-1986) A&AS 87, 481 NASA ADS
• Manfroid J., Sterken C., Cunow B., et al., 1994, Third Cat. Stars Measured in the LTPV Project (1990-1992) A&AS 109, 329 NASA ADS
• Mendoza V.E.E., 1970, Bol. Obs. Tonantzintla y Tacubaya 5, 269
• Nieuwenhuijzen H., de Jager C., 1995, A&A 302, 811 NASA ADS
• Nieuwenhuijzen H., de Jager C., Groth H.G., 1997, A&A (submitted)
• Shore S.N., Brown D.N., Bopp B.W., et al., 1990, ApJS 73, 461 NASA ADS
• Spoon H.W.W., de Koter A., Sterken C., et al., 1994, A&AS 106, 141 NASA ADS
• Stahl O., Wolf B., Klare G., et al., 1983, A&A 127, 49 NASA ADS
• Stahl O., Wolf B., Leitherer C., et al., 1984, A&A 140, 459 NASA ADS
• Stahl O., Wolf B., 1986, A&A 154, 243 NASA ADS
• Stahl O., Wolf B., Klare G., et al., 1990, A&A 228, 379 NASA ADS
• Sterken C., 1977, A&A 57, 361 NASA ADS
• Sterken C., 1981, in ESO Workshop: The Most Massive Stars, D'Odorico S., Baade D., Kjär K. (eds.) p. 147
• Sterken C., 1983, The Messenger 33, 10 NASA ADS
• Sterken C., Gosset E., Jüttner A., et al., 1991, A&A 247, 383 NASA ADS
• Sterken C., Manfroid J., Anton K., et al., 1993, Second Cat. Stars Measured in the LTPV Project (1986-1990) A&AS 102, 79 NASA ADS
• Sterken C., Manfroid J., Beele D., et al., 1995, Fourth Cat. Stars Measured in the LTPV Project (1992-1994) A&AS 113, 31 NASA ADS
• Sterken C., de Groot M., van Genderen A.M., 1996a, A&AS 116, 9 NASA ADS
• Sterken C., Jones, A., van Genderen A.M., de Groot M., 1996b, in: Astronomical photometry into the next millenium, Proc. P.E.P. 5, B. Carter & J. O'Mara (eds.) (in press)
• Sterken C., de Groot M., van Genderen A.M., 1997, A&A (in press)
• Szeifert Th., Stahl O., Wolf B., et al., 1993, A&A 280, 508 NASA ADS
• Thackeray A.D., 1974, MNRAS 168, 221 NASA ADS
• Walborn N.R., 1977, ApJ 215, 53 NASA ADS
• Walborn N.R., 1982, ApJ 256, 452 NASA ADS
• Walraven Th., Walraven J.H., 1977, A&AS 30, 245
• Wisse M., Wisse P.J.N., 1971, A&A 12, 149 NASA ADS
• Wolf B., 1972, A&A 20, 275 NASA ADS
• Wolf B., 1989, in Phyisics of Luminous Blue Variables, IAU Coll. 113, Davidson K., Moffat A.F.J., Lamers H.J.G.L.M. (eds.). Kluwer, p. 96
• Wolf B., 1992, in Nonisotropic Outflows from Stars, Drissen L., Leitherer C., Nota A. (eds.). ASP Conf. Ser. 22, 327
• Wolf B., Campusano L., Sterken C., 1974, A&A 36, 87 NASA ADS
• Wolf B., Appenzeller I., Stahl O., 1981, A&A 103, 94 NASA ADS
• Wolf B., Stahl O., 1990, A&A 235, 340 NASA ADS