Astronomy Questions

Hi all,

I've been going through the star list I downloaded from Nyrath's web
site,
and there are some odd notations for the spectra of some of the stars on
the
list. Would some kind soul please explain the following:

k (specifically lowercase, as opposed to "K" stars, which seem to have
much
higher luminosity), and k-m (also lowercase)?

dK5, dK6, dK8, dM4 -- could these be orange dwarfs and red dwarfs?

DA, DA3, DA4, DA5, DA6, DA9, DAP9, DAV4, DAwk, DXP5, DXP8, DXP9 -- all
of
these are white dwarfs of some kind (because they all begin with "D"),
but
what are the distinctions between them? Do some of them refer to
pulsars,
neutron stars, and/or black holes?

Thank you very much!