Located on the bottom left corner of a Hertzsprung-Russell diagram, they cause type Ia supernovae when they exceed 1.44 solar masses, known as the Chandrasekhar limit.
One of these objects was first investigated by Bessel, who noted that although it had a similar mass to our sun, it was noticeably dimmer. These objects frequently show only hydrogen in spectroscopies, due to heavier elements "sinking" farther into the object. One example of these objects, (*) Sirius B, was calculated to have a density of approximately one hundred and twenty five kilograms per cubic centimeter.  Located on the bottom left corner of a Hertzsprung-Russell diagram, they cause type Ia supernovae when they exceed 1.44 solar masses, known as the Chandrasekhar limit. For 10 points, name this stellar object formed at the end of a typical massive main-sequence star's life, a small, hot star.
One of these objects was first investigated by Bessel, who noted that although it had a similar mass to our sun, it was noticeably dimmer.
white dwarf [prompt on dwarf]