Absolute photometry of the Crab Nebula
Abstract
The observations discussed were made on December 6 and 7, 1980, using the Walraven VBLUW simultaneous photometer with the Leiden 90-cm light collector (ESO, La Silla, Chile). For each observation, a 16-arcsec diaphragm was used, and the integration time was 192 s. The astrophysical quantities derived for M 1 from the broad passband VBLUW observations are found to agree with other observations. This agreement is believed to derive from a determination of the contribution of emission line radiation in the observations. It is pointed out that the photometric system may be used to observe, with smaller diaphragms (greater than about 5 arcsec), small-scale details of M 1, for example, the synchrotron emission of the wisps and the line emission at positions where spectral data are given by Woltjer (1958).
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1982
- Bibcode:
- 1982A&A...115...79G
- Keywords:
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- Astronomical Photometry;
- Astronomical Spectroscopy;
- Crab Nebula;
- Visual Photometry;
- Emission Spectra;
- Line Spectra;
- Supernova Remnants;
- Synchrotron Radiation;
- Astronomy