FOOTNOTES:
[1] Meddelanden från Lunds Observatorium, No. 41.
[2] Meddelanden från Lunds Astronomiska Observatorium, Serie II, No. 14.
[3] Annals of the Harvard Observatory, vol. 50.
[4] In order to deduce from M the apparent magnitude at a distance corresponding to a parallax of 1″ we may subtract 3m.48. To obtain the magnitude corresponding to a parallax of 0″.1 we may add 1.57. The latter distance is chosen by some writers on stellar statistics.
[5] The best colour-scale of the latter sort seems to be that of Osthoff.
[6] Compare H. A. 50 and H. A. 56 and the remarks in L. M. II, 19.
[7] “Bonner Sternverzeichnis” in den Astronomischen Beobachtungen auf der Sternwarte zu Bonn, Dritter bis Fünfter Band. Bonn 1859-62.
[8] “Bonner Durchmusterung”, Vierte Sektion. Achter Band der Astronomischen Beobachtungen zu Bonn, 1886.
[9] “The Cape Photographic Durchmusterung” by David Gill and J. C. Kapteyn, Annals of the Cape Observatory, vol. III-V (1896-1900).