NGC 1313 - SB(s)dm

NGC 1313

De Vaucouleurs Atlas Type: SB(s)dm

Filter: B

Telescope: LCO 2.5-m
North up , East left
Field Dimensions: 8.9 x 8.9 arcminutes

RC3 Type: SB(s)d
RSA Type: SBc
Surface Brightness Range Displayed: 19.0-26.0 mag per square arcsec
Absolute Blue Magnitude: -18.6
Elmegreen Spiral Arm Class: AC 5

De Vaucouleurs Atlas Description:

De Vaucouleurs (1963b) considered NGC 1313 a transition between the Sc spirals and the Magellanic spirals. His reasons for classifying NGC 1313 as SB(s)d were the presence of the two spiral arms breaking from the ends of the bar, the slight asymmetry of these arms, and the small, faint nucleus in the center of the bar. However, the galaxy has considerable asymmetry . Also, Marcelin and Athanassoula (1982) show that NGC 1313 rotates around a center completely outside the bar, a feature which is characteristic of SBm galaxies (de Vaucouleurs and Freeman 1973). For these reasons, we consider NGC 1313 to be a transition stage Sdm to the SBm stage.