Studies of supernovae.
Abstract
Summary. This paper consists of two separate sections. In Section 1 a new calibration of Type I supernovae is given through the use of the Hubble diagram. A mean absolute magnitude at maximum Mpg = - t8.t5 +5 log (H/tOO) is found with no clear separation between "fast" and "slow" subtypes. In Section II, the radial distribution of supernovae within their parent galaxies is considered by using the distance-independent parameter = r/R. The frequency distribution of the values, after a proper correction for projection is applied, indicates that about t/3 of supernovae occur beyond the optical image of galaxies. A surface density of supernovae, consistent with the brightness distribution in the disks of spiral galaxies, is derived. Key words: supernovae galaxies distance in- dicators
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1975
- Bibcode:
- 1975A&A....44..267B