The lines of the trunk seem to appear at lower temperatures, which may account for the fact that it can be observed as absorption lines.
less number of dark absorption lines or bands.
the case of the sun, this indicates an incandescent body which might be solid, liquid, or a not too rare gas, surrounded by and seen through an atmosphere of somewhat cooler gases and vapours; it is this cooler envelope whose nature the spectroscope reveals to us, and in it the presence of many terrestrial elements has been detected by identifying in the spectrum their characteristic absorption lines.
or " Sirian " type includes most of the bright white stars, such as Sirius, Vega, Rigel, &c.; it is characterized by strong broad hydrogen lines, which are often the only absorption lines visible.
Generally speaking, the same absorption lines are present, but with altered intensities, which differ from one spot to another.