The first thing to note is that, in certain aspects, the stars seem to vary a great deal among themselves. Certain of them, the ‘red giants’, are of colossal dimensions, their diameter exceeding 450 times that of the Sun (if the sun were as large as they it would extend beyond Earth, Jupiter and Saturn as far as Uranus!) Others, the ‘white dwarfs’, are smaller than the earth; and still others, the most numerous category, closely resemble the sun both in their dimensions and their yellow colour. We find similar contrasts of brilliance and temperature. One star may be the equivalent of 300,000 suns in luminosity, whereas another may amount to only a fifty-thousandth part of it (as great a difference, the astronomer Sir James Jeans observed, as there is between a lighthouse and a glow-worm). These, of course, are extreme cases. In the matter of surface-temperature, if the Sun and the majority of stars are round about 6,000˚ Centigrade (three times the temperature of an electric arc) there are some of 11,000˚ (Sirius) and even of 23,000˚; and on the other hand there are some as low as 3,500˚ (the red giants).
This is what i found-
so why would a "white dwarf be the last stage in the suns transfermation. In this article it says that a "white dwarf" is smaller then the sun?