Absolute spectrophotometry in M31 and M32.
Abstract
For a number of places in the bulge of M31, and for two places in M32, photometric scans from lambda = 3300 A to lambda = 10,600 A have been obtained with the multichannel spectrometer on the 5-m Hale telescope. The scans show that in both objects the color temperature (particularly shortward of 5000 A) decreases toward the center, and that the strength of the CN bands increases toward the center in both objects, in agreement with other earlier observations. The new data can all be interpreted in terms of an increase of heavy-element abundance toward the center in both objects by a factor probably less than 2, and by an excess of heavy elements in M31 compared with M32 by a factor probably greater than 2, in qualitative agreement with earlier conclusions of other observers.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1975
- DOI:
- 10.1086/153576
- Bibcode:
- 1975ApJ...198...63O
- Keywords:
-
- Andromeda Galaxy;
- Astronomical Photometry;
- Brightness Temperature;
- Galactic Radiation;
- Spectrophotometry;
- Abundance;
- Astronomical Spectroscopy;
- Heavy Elements;
- Spectral Bands;
- Astronomy