There are several D mesons that all have in common a charm quark. Then you have different options for the extra quark, and you can also have different states according to their total angular momentum (s-wave, p-wave, etc.). D* mesons are some of those possible combinations.
There are several D mesons that all have in common a charm quark. Then you have different options for the extra quark, and you can also have different states according to their total angular momentum (s-wave, p-wave, etc.). D* mesons are some of those possible combinations.