Recursos de colección

Caltech Authors (171.365 recursos)

Repository of works by Caltech published authors.

Group = Palomar Observatory

Mostrando recursos 1 - 2 de 2

  1. A luminous companion to SGR 1806-20

    van Kerkwijk, M. H.; Kulkarni, S. R.; Matthews, K.; Neugebauer, G.
    We have obtained infrared spectra of the star suggested to be the counterpart of the soft gamma-ray repeater (SGR) 1806-20. We found strong emission lines similar to those seen in the spectra of the rare luminous blue variables and B(e) stars. A He I absorption line is also seen, from which we infer a spectral type O9-B2. This classification, in combination with the minimum distance of greater than or approximately = 6 kpc inferred from its extinction, makes the star one of the most luminous in the Galaxy. We infer that it is a companion to SGR 1806-20 and suggest...
    (application/pdf) - 31-oct-2017

  2. National Geographic Society - Palomar Observatory Sky Atlas

    The National Geographic Society-Palomar Observatory Sky Atlas contains photographic reproductions of red- and blue-sensitive photographs of fields obtained with the 48-inch Schmidt telescope of the Palomar Observatory for the National Geographic Society-Palomar Observatory Sky Survey. The atlas covers the entire sky north of -27° declination. The sky survey was made financially possible by generous grants from the National Geographic Society. The Society provided the photographic materials and equipment required, the salaries of the personnel employed full or part time on the survey, and in addition, the production of two contact positives on glass of each survey photograph. One set of these...
    (application/pdf) - 07-jul-2018

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