Answer: 15)Luminosity of Betelgeus-----of 100,000 times the Sun.
color of Betelgius---- red
16) White dwarf star group
Explanation:Betelgeuse a red super giant also known as Alpha Orion is ( the 2nd brightest naked eye star in the constellation Orion and the 9th brightest star in the entire sky with absolute magnitude is -5.14 and its distance is 428 light years having surface temperature of 3500° Kelvin and a luminosity 140,000 times the Sun.
Betelgeuse is easy to spot in the night because of its proximity to the belt of Orion
16)white dwarf star group,also called a degenerate dwarf, is a very dense stellar core made up of electron-degenerate matter with mass liken to that of the sun.It is characterised with very low luminousity due to the emmisson of stored thermal energy. An example is the Procyon B , an alpha star located in the constellation of Canis Minor.