Accession Number:

ADA030506

Title:

The Development of Techniques for the Extension of the Magnitude Scale in Selected Equatorial Kapteyn Areas with an Image Orthicon System.

Descriptive Note:

Final rept. Jun 73-Aug 74

Corporate Author:

NORTHWESTERN UNIV EVANSTON ILL DEPT OF ASTRONOMY

Report Date:

1976-04-01

Pagination or Media Count:

75.0

Abstract:

The development of the image orthicon into a viable photometric tool is discussed along with the limitations of its effectiveness. It is shown that the image orthicon is capable of stellar photometry with probable errors in magnitude of 0.05. Using a 24-inch f10 Cassegrain at the Corralitos Observatory in New Mexico, the image orthicon gave repeatable results over an eight magnitude range down to the 18th magnitude with three-second integration times. Reduction curves connecting image diameters with visual magnitudes were derived using standard magnitudes of Sandage and Eggen for stars in NGC 188 for calibration. This photometric technique is particularly adaptable to photometry of an entire field of objects. Author

Subject Categories:

  • Astronomy
  • Optical Detection and Detectors
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE