Erika Le Bourdais has a beautiful explanation diagram. A record: 13 metals found in one white dwarf, can extract mass of metals. Would have been an asteroid at least 150-200km in size that got eaten by the white dwarf
RE: https://mastodon.social/@sundogplanets/115294536661527209
Truly amazing the details we can get out of Stars these days, not only confirming a planetoid hit this burned out old star but how big it was and what it was made of. All from light years away!