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en.wikipedia.org/wiki/White_dwarf

A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to that of the Sun, while its volume is comparable to that .... The spectral type of 40 Eridani B was officially described in 1914 by Walter Adams. The white ...

en.wikipedia.org/wiki/O-type_star

Relative size of O-type stars with other main-sequence stars. An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system .... O- type stars represent the highest masses of stars on the main sequence. ... It has been estimated that there are around 20,000 massive O-type stars in the galaxy.

www.flashcardmachine.com/stellar-astronomy-test4.html

Apr 17, 2012 ... Most of the new star formation in the Milky Way Galaxy is found in the ... The greatest variation in size and mass occurs in which type of galaxy?

www.flashcardmachine.com/stellar-astronomy-finalexam.html

Apr 17, 2012 ... Stellar masses are determined directly by observation of the orbits ..... The greatest variation in size and mass occurs in which type of galaxy?

space-facts.com/galaxy-types

It uses the three main types, and then further breaks them down by specific characteristics (openness of spirals, size and extent of bars, size of galactic bulges).

www.space.com/22395-elliptical-galaxies.html

Aug 15, 2013 ... Elliptical galaxies are the most abundant type of galaxies found in the ... the size of the Milky Way and contain only ten million times the mass of ...

adsabs.harvard.edu/full/1988AJ.....95.1047M

Spurious radial variations in ~d'/L can occur when none are present if the .... GALAXY TYPE Re (kpc) rc (pc) Re/rc (M/L)~ (M/L)e NGC 741 EO 22.5 519 43.3 19 21.5 ... by the size of the galactic cores and plausible variations in the stellar velocity ..... having the greatest fraction ofdark stellar mass, result in strongly decreasing ...

arxiv.org/pdf/0908.3017

Aug 20, 2009 ... that the scaling relations followed by each galaxy type change very little with environment, with .... and photometric measurements for each galaxy: luminosities, sizes, ..... In the context of SDSS, another problem exists: the biggest galaxies ... First, let us consider the variation of the stellar mass function with ...

www.britannica.com/science/galaxy/Types-of-galaxies

galaxy - Types of galaxies: Almost all current systems of galaxy classification are ... Each of these classes is subclassified into three types according to the size of the .... of its own, type Sd. It also has been found that some of the variations noted here for Sc ..... The mass of a typical large spiral is about 500,000,000,000 Suns.