Lecture Index Next Topic: Introduction to Stellar Populations

ASTR 5610, Majewski [SPRING 2014]. Lecture Notes

ASTR 5610 (Majewski) Lecture Notes


BAADE (1944) PAPERS DISCUSSION


  • See Baade (1944, ApJ, 100, 137 and 1944, ApJ, 100, 147), and Oort (1926)


    First sweeping collectivization of ``stellar population" properties
  • CMD types <--> structural components

    The Andromeda system M31, M32 and N205.

    Baade's famous plate, reproduced from Majewski (ed.), Galaxy Evolution: The Milky Way Perspective, ASP Conf. Ser. 49.

    High contrast zoom of previous image to show the incipient resolution of the "Baade sheet". Baade's famous plate, reproduced from Majewski (ed.), Galaxy Evolution: The Milky Way Perspective, ASP Conf. Ser. 49.

    The plate envelope from Baade's famous plate. He knew immediately that he had been successful. Reproduced from Majewski (ed.), Galaxy Evolution: The Milky Way Perspective, ASP Conf. Ser. 49.

    Baade's definition of populations based on CMD type.

    Population I and II separately shown, for comparison to Baade's famous figure: (left) A modern HR diagram of the solar neighborhood, showing the typical loci seen for Pop I stars. From Wikipedia. (right) A color-magnitude diagram for the globular cluster M3 by Baade's student Allan Sandage using photographic plates taken by Baade. The CMD shows the typical loci for Pop II stars (but much deeper than what Baade knew about in 1944). From Sandage (1953).

    Bingelli's famous diagram, taken from Sparke & Gallagher, Galaxies in the Universe.

    Spheroidal/elliptical characteristics by Kormendy, taken from Sparke & Gallagher, Galaxies in the Universe.

    Baade's Population II:

    Baade's Population I:



    Key points about population types in galaxies:
    Lecture Index Next Topic: Introduction to Stellar Populations

    All material copyright 2003,2006,2008 ,2012 Steven R. Majewski. All rights reserved. These notes are intended for the private, noncommercial use of students enrolled in Astronomy 551 and ASTR 5610 at the University of Virginia.