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===Beta Persei A===

===Beta Persei A===

Algol A (Beta Persei A) is a blue white main sequence dwarf star of spectral type B5-8 V, and the most massive of the triple star system. The star has a diameter 2.88 times that of our [[Sun]] with a mass 3.59 times as great.<ref name="kim">http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1989ApJ...342.1061K</ref> The star is considerably brighter, its visual luminosity is 98 times of the Sun, the total luminosity though is some 200 times as great, accounting for [[ultraviolet]] [[radiation]]. Algol A rotates at a quick 65 km/sec and could possibly be less then 300 million years old.

'''Algol A''' (Beta Persei A) is a blue white main sequence dwarf star of spectral type B5-8 V, and the most massive of the triple star system. The star has a diameter 2.88 times that of our [[Sun]] with a mass 3.59 times as great.<ref name="kim">http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1989ApJ...342.1061K</ref> The star is considerably brighter, its visual luminosity is 98 times of the Sun, the total luminosity though is some 200 times as great, accounting for [[ultraviolet]] [[radiation]]. Algol A rotates at a quick 65 km/sec and could possibly be less then 300 million years old.

===Beta Persei B===

===Beta Persei B===

Algol B (Beta Persei B) is a orange-red subgiant star of spectral class K0-2 IV. Once the most massive of the three stars of the system, it has become a cool, low-mass star that has distorted into a teardrop shape from the [[tidal force|tidal forces]] caused by its companion, Algol A. The gas from Algol B itself is being drained slowly away in an accretion stream towards its close companion, now the more massive of the two stars. Algol B itself has around 79 percent of our Sun's mass and 3.54 times its diameter. As a subgiant, the star is also 3.4 times as luminous as our Sun.<ref name="kim">http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1989ApJ...342.1061K</ref>

'''Algol B''' (Beta Persei B) is a orange-red subgiant star of spectral class K0-2 IV. Once the most massive of the three stars of the system, it has become a cool, low-mass star that has distorted into a teardrop shape from the [[tidal force|tidal forces]] caused by its companion, Algol A. The gas from Algol B itself is being drained slowly away in an accretion stream towards its close companion, now the more massive of the two stars. Algol B itself has around 79 percent of our Sun's mass and 3.54 times its diameter. As a subgiant, the star is also 3.4 times as luminous as our Sun.<ref name="kim">http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1989ApJ...342.1061K</ref>

===Beta Persei C===

===Beta Persei C===

Algol C (Beta Persei C) is a blue white main sequence dwarf of spectral type A5 V. The star has 1.7 times our Sun's diameter and 1.67 times its mass. Its luminosity is around 4.1 times that of our Sun. Algol C orbits the other two stars with an average orbit of 2.69 AU.<ref name="kim">http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1989ApJ...342.1061K</ref>

'''Algol C''' (Beta Persei C) is a blue white main sequence dwarf of spectral type A5 V. The star has 1.7 times our Sun's diameter and 1.67 times its mass. Its luminosity is around 4.1 times that of our Sun. Algol C orbits the other two stars with an average orbit of 2.69 AU.<ref name="kim">http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1989ApJ...342.1061K</ref>

For an [[terrestrial planet|Earth-like]] world to have liquid [[water]] on its surface, it would have to be around 14 AU from the three stars, or the equivalent of an orbit between [[Saturn]] and [[Uranus]]. The hypothetical world would have an orbital period of over 27 years. Because the system itself is very young, it is unlikely such a planet would have time to cool to the point of holding water.

For an [[terrestrial planet|Earth-like]] world to have liquid [[water]] on its surface, it would have to be around 14 AU from the three stars, or the equivalent of an orbit between [[Saturn]] and [[Uranus]]. The hypothetical world would have an orbital period of over 27 years. Because the system itself is very young, it is unlikely such a planet would have time to cool to the point of holding water.