References in the tables

AlE = Allen, D.A. 1984, Proc. Astr. Soc. Aus., 5,39.
AlS = Allen and Swings 1976, A&A, 47, 293.
AoS = Acker. A., Ochsenbein, F., Stenholm, B., Tylenda, B., Marcourt, J., Schohn, C. 1992, The Strasbourg-ESO catalogue of Galactic Planetary Nebula - Part I&II.
ArC = Acker, A., Chopinet, M., Pottasch, S.R., Stenholm, B. 1987, A&AS, 71, 165.
BaS = Bhatt, H.C., Sagar, R. 1992, A&AS, 92, 473.
BeC = Berrilli, F., Corciulo, G., Ingrosso, G., Lorenzetti, D., Nisini, B., Strafella, F. 1992, ApJ, 398, 254.
BiD = Bidelman, W.P. 1976, in IAU Colloq., Be and Shell Stars, ed. A. Slettebak, p457.
BiM = Bidelman, W.P. 1954, ApJS, 1, 175.
BiT = Bibo, E.A., Thé, P.S. 1991, A&AS, 89, 319.
BoH = Bopp, B.W., Howell, B.S. 1989, PASP, 101, 981.
BoW = Bogaert, E., Waelkens, C. 1990, In Int. Colloq., The infrared spectral region of stars, eds. C. Jaschek and Y. Andrillat, p345.
CaH = Carlson, E.D., Henize, K.G. 1979, Vistas in Astronomy, 23, 213.
CiD = Ciatti, F., D'Odorico, S., Mammano, A. 1974, A&A 34, 181.
CoN = O'Connell, D.J.K. 1951, MNRAS, 111, 111.
DeB = Davies, J.K, Evans, A., Bode, M.F., Whittet, D.C.B. 1990, MNRAS, 247, 517.
DoH = Dong, Y.S., Hu, J.Y. 1991, Chin. A&A, 15, 275.
FiM = Finkezeller, U., Mundt, R. 1984, A&AS, 55, 109.
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IDS = Jeffers, H.M., v.d. Bos, W.H., Greeby, F.M. 1963, Catalogue of visual double stars, Publ. Lick Obs, 21, 17+263+804.
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PaP = Parthasarathy, M., Pottasch, S.R. 1989; A&A 225, 521.
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SeT = Slettebak, A. 1986, PASP, 98, 867.
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SoN = Strom, K.M., Newton, G., Strom, S.E., Seaman, R.L., Carrasco, L., Cruz-Gonzales, I., Serrano, A. 1989, ApJS, 71, 183.
TiS = This paper.
WaS = Walter, F.M., Skinner, S.L., Boyd, W.T. 1990, PASP, 102, 754.
WeJ = Weaver, W.B., Jones, G. 1992, ApJS, 78, 239.
WeT = Weintraub, D.A. 1990, ApJS, 74, 575.
WiH = de Winter, D., Hu, J.Y., Thé, P.S., in preparation.
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ZiS = Zickgraf, F.-J., Schulte-Ladbeck, R.E. 1989, A&A, 214, 274.