Abstract
A SURVEY programme to take H α photographs of galactic emission nebulae has been in progress since October 1966 at the Tokyo Astronomical Observatory using the 50 cm Schmidt telescope at the Dodaira Station1. A combination of Eastman Kodak 103a-E plate and Hoya colour glass R64 5 mm thick are being used. The combination gives a passband about 300 Å wide centred at λ6563 Å, and provides H α pictures of emission nebulae after subtraction of other nebular radiations contained within the passband. Each plate is carefully calibrated by means of a tube sensitometer; the absolute brightness scale is obtained by measuring the brightness of selected star images.
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References
Ishida, K., and Ohashi, M., Bull. Tokyo Astro. Obs., Ser. 2, No. 178, 245 (1967).
Akabane, K., Miyazawa, K., Takahashi, T., Ishizawa, Y., and Nakajima, T., Bull. Tokyo Astro. Obs., Ser. 2, No. 177, 241 (1967).
Ishida, K., and Kawajiri, N., Publ. Astro. Soc. Japan (in the press).
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ISHIDA, K., AKABANE, K. Small Scale Distribution of Interstellar Absorption. Nature 217, 433–435 (1968). https://doi.org/10.1038/217433b0
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DOI: https://doi.org/10.1038/217433b0
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