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- W1993851436 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A comparison of star counts in the photographic and photo-red magnitude systems. Miller, Freeman D. Abstract Galactic density gradients deduced from conventional analysis of general star counts according to photographic magnitude can be checked by parallel analysis of a set of companion counts on the photo-red system. This procedure has been applied to an area at the north celestial pole, where the necessary magnitude standards are well established, and the interstellar absorption has been carefully studied by Seares and others. Counts to the sixteenth photographic magnitude, 1800 stars, and to the fifteenth photo-red magnitude, 3000 stars, were made on plates taken with the Curtis Schmidt of the University of Michigan Observatory. The two analyses, of photographic and photo- red data, are to a considerable extent independent of one another. The counts are made on different sets of plates and magnitude systems. The interstellar absorption differs due to the different effective wave lengths, and the two general luminosity functions differ in form. Nevertheless, if all data and assumptions are correct, the two density functions must be in agreement. In this investigation, the photographic counts were analysed numerically, and the resulting density function was combined with the photo- red luminosity function to give a prediction of the theoretical photo-red counts. The calculated and observed photo-red counts are in clear disagreement. The source of this lack of agreement is not yet apparent, but its occurrence in the present situation, in which the errors of the magnitude standards are negligible, and the character of the interstellar absorption is better established than is ordinarily the case, is a further indication of the difficulties which stand in the way of the interpretation of general star counts. The Observatory, University of Michigan, Ann Arbor, Mich. Publication: The Astronomical Journal Pub Date: 1951 DOI: 10.1086/106627 Bibcode: 1951AJ.....56S..44M full text sources ADS |" @default.
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- W1993851436 date "1951-01-01" @default.
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- W1993851436 title "A comparison of star counts in the photographic and photo-red magnitude systems." @default.
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