Κ機構
ISBN 978-0-691-08253-0. https://books.google.com/books?id=-kiqQgAACAAJ
Andre Maeder (19 December 2008). Physics, Formation and Evolution of Rotating Stars. Springer Science & Business Media. ISBN 978-3-540-76949-1. https://books.google.com/books?id=akDVteYDC1kC In Fig. 15.8 at p.399 there is a schematic representation of the variations of V magnitude, radial velocity, radius with respect to the minimum radius and effective temperature of a classical Cepheid (δ Ceph) over one period.