The most widely used is the AB magnitude system, in which photometric zeropoints are based on a hypothetical reference spectrum having constant flux per unit frequency interval, rather than using a stellar spectrum or blackbody curve as the reference.
12.
Changes are observed in the absorption lines of the stellar spectrum : the occultation of the star by the gas cloud coming from the exocomet produces additional absorption features beyond those normally seen in that star, like those observed in the ionized calcium lines.
13.
Models of LBV progenitors of type IIb supernovae list AG Carinae as matching the final stellar spectrum prior to core collapse, although the models are for stars with 20 to 25 times the mass of the Sun while AG Carinae is thought to be considerably larger.
14.
According to The Facts on File Dictionary of Astronomy, an early scheme was alphabetical, based on the strength of hydrogen absorption lines in the stellar spectrum, with the classification running from A to P . A later rearrangement was designed to correspond to a sequence of decreasing surface temperatures; most stars could be divided into seven spectral types.
15.
Radial velocity measurements taken by Henri-Alexandre Deslandres at Paris Observatory showed that Mintaka had a variable radial velocity and therefore was a calcium K line at 393.4 nanometres in the stellar spectrum did not share in the periodic displacements of the lines due to orbital motion of the star and theorized that there was a cloud in the line of sight to Mintaka that contained calcium.
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