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2. van Maanen 2 - Wikipedia

   en.wikipedia.org/wiki/Van_Maanen_2

   The progenitor of this white dwarf had an estimated 2.6 solar masses and remained on the main sequence for about 900 million years. This gives the star an overall age of about 4.1 billion years. When this star left the main sequence, it expanded into a red giant that reached a maximum radius of 1,000 times the current radius of the Sun, or ...

3. B-type main-sequence star - Wikipedia

   en.wikipedia.org/wiki/B-type_main-sequence_star

   The revised Yerkes Atlas system (Johnson & Morgan 1953) [12] listed a dense grid of B-type dwarf spectral standard stars, however not all of these have survived to this day as standards. The "anchor points" of the MK spectral classification system among the B-type main-sequence dwarf stars, i.e. those standard stars that have remain unchanged ...

4. White dwarf - Wikipedia

   en.wikipedia.org/wiki/White_dwarf

   Sirius B, which is a white dwarf, can be seen as a faint point of light to the lower left of the much brighter Sirius A. A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: in an Earth sized volume, it packs a mass that is comparable to the Sun.

5. Subdwarf - Wikipedia

   en.wikipedia.org/wiki/Subdwarf

   It has a mass of 84 to 87 M J, making VVV 1256−62B likely a red dwarf star. [14] The subdwarf Wolf 1130C (sdT8) is the companion of an old subdwarf-white dwarf binary, which is estimated to be older than 10 billion years. It has a mass of 44.9 M J, making it a brown dwarf.

6. G-type main-sequence star - Wikipedia

   en.wikipedia.org/wiki/G-type_main-sequence_star

   A G-type main-sequence star (spectral type: G-V), also often, and imprecisely, called a yellow dwarf, or G star, is a main-sequence star (luminosity class V) of spectral type G. Such a star has about 0.9 to 1.1 solar masses and an effective temperature between about 5,300 and 6,000 K (5,000 and 5,700 °C ; 9,100 and 10,000 °F ).

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