21. Sigma Ceti is an F5V Dwarf star with an effective temperature of 6600 Kelvin. 22. This planet is one of the most massive found around a red dwarf star . 23. Red dwarf stars are unstable and eject frequent solar flares. 24. A 1938 paper co-written with Robert Serber explored the properties of white dwarf stars . 25. Eta Chamaeleontis is an B8V dwarf star with an effective temperature of 12000 Kelvin. 26. HD 108541 is n B8V Dwarf star with an effective temperature of 10000 Kelvin. 27. It is one of the largest and brightest M class red dwarf stars known. 28. The planet was discovered orbiting the yellow dwarf star now designated XO-1 in 2006. 29. Among the subjects of his research were white dwarf stars , supernovae and galactic astronomy. 30. Luyten's major field of research was devoted to the discovery of white dwarf stars .
