AN ABSOLUTE ISOPHOTOMETRY OF THE SOUTHERN MILKY WAY AND TWO FIELDS IN ORION
Abstract
THE FORM AND ABSOLUTE BRIGHTNESS OF THE SOUTHERN MILKY WAY ARE REPRESENTED BY MEANS OF ISOPHOTAL CHARTS IN 3 PASSBANDS. ONE OF THE PASSBANDS IS CENTERED ON H(ALPHA) AND ANOTHER NEAR H(BETA) SO THAT STRONG EMISSIONS OF H II REGIONS ARE SELECTED; THE THIRD PASSES A YELLOW CONTINUUM SERVING AS A STANDARD NEARLY FREE OF NEBULAR EMISSIONS. THE ISOPHOTAL CHARTS SHOW 78 FIELDS, EACH 11.5 DEGREES IN DIAMETER ALONG 182 DEGREES OF THE MILKY WAY;THE CENTERS LIE ROUGHLY 7 DEGREES APART ONTHE GALACTIC EQUATOR. TWO MORE FIELDS ARE CENTERED ON ORIONIS (THETA AND LAMBDA). EACH CHART SHOWS A FIELD IN 3 PASSBANDS CENTERED NEAR 6560A IN THE UPPER LEFT, 4810A IN THE LOWER LEFT, AND 6070A ON THE MIDDLE RIGHT. THE PLATES FOR THE CHARTS WERE TAKEN WITH A 8-IN. F/1 FIELD FLATTENED SCHMIDT CAMERA;A TUBE SENSITOMETER EXPOSED SPOTS ON THE MARGINS OF THE PLATES. THE ISOPHOTES WERE TRACED FROM ENLARGEMENTS OF THE PLATES, ON A SAMPLE ANALYSIS IS MADE OF THE H II REGION AROUND ETA CACARINEA IN ORDER TO SHOW PROBLEMS ARISING WITH THE USE OF THE CHARTS
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1960
- Accession Number
- AD0250596
Entities
People
- Hugh M. Johnson
Organizations
- Australian National University