Abstract
BUELLETIN 9 from the Madrid Observatory deals first of all with the photographic and visual observations of Nova Lacertæ 1936, made at the Observatory. The photographs were obtained by means of a camera of short focus used in conjunction with the Grubb photographic equatorial, which has an aperture of 16 cm. and focal length 80 cm. The method employed for determining the magnitude of the nova was by measuring the diameters of the focal images, and applying the formulæ of Charlier and Parkhurst, adopting the mean from both formulæ. Nine comparison stars of various spectral types were used and the results are shown in Table 2, the observations extending over the period June 21–July 17, 1936. In addition to the photographic observations, about 500 visual observations were made between June 18 and July 20, the results of which are given in Table 3, and from these the colour-index was deduced. This varied according to the spectral type of comparison star; for Class F0 it was 0·30 arid for Class B8 it was – 0·08, and was practically zero for Class A0. A curve shows the results of the photographic and visual determinations of magnitudes, the photographic magnitudes being represented by circles which lie close to the visual magnitude curve.
Article PDF
Rights and permissions
About this article
Cite this article
Work at the Madrid Observatory. Nature 153, 678–679 (1944). https://doi.org/10.1038/153678e0
Issue Date:
DOI: https://doi.org/10.1038/153678e0