Keep in mind that surface temps could be anywhere from, say, a few low-thousands of K (dull red) to hundreds, possibly even tens. Constitution would likely be roughly 75% hydrogen / 25% helium, and up, with some lithium and possibly higher metalicity constituents.
What you wouldn't have though is a high-silicate crust with a bunch of CNO -- carbon, nitrogen, and oxygen.
Temperature and chemistry can both be ascertained through spectral emissions (wavelength corresponds to temp via blackbody, emission or absorption spectra to chemistry).
I'm not an astronomer though I've got a pretty good lay grasp of the subject. There may well be some literature on dwarf star chemistry and temperature, and Wikpedia is likely a good starting point.
Keep in mind that surface temps could be anywhere from, say, a few low-thousands of K (dull red) to hundreds, possibly even tens. Constitution would likely be roughly 75% hydrogen / 25% helium, and up, with some lithium and possibly higher metalicity constituents.
What you wouldn't have though is a high-silicate crust with a bunch of CNO -- carbon, nitrogen, and oxygen.
Temperature and chemistry can both be ascertained through spectral emissions (wavelength corresponds to temp via blackbody, emission or absorption spectra to chemistry).
I'm not an astronomer though I've got a pretty good lay grasp of the subject. There may well be some literature on dwarf star chemistry and temperature, and Wikpedia is likely a good starting point.