The differences between the different spectral types of stars are primarily due to?
singleAnswer
temperature of the photosphere
Stellar classification
spectral stars
Stellar classification Red dwarf G-type main-sequence star K-type main-sequence star O-type star B-type main-sequence star A-type main-sequence star O-type main-sequence star Category:Stars by spectral type Astronomical spectroscopy
In astronomy, stellar classification is the classification of <b>stars</b> based on their 
<b>spectral</b> characteristics. Electromagnetic radiation from the <b>star</b> is analyzed by&nbsp;... A red dwarf is the smallest and coolest kind of <b>star</b> on the main sequence. Red 
dwarfs are by far ... The <b>spectral</b> standards for M-type <b>stars</b> have changed slightly 
over the years, but settled down somewhat since the early 1990s. Part of this is&nbsp;... The &quot;anchor points&quot; of the MK <b>spectral</b> classification system among the G-type 
main-sequence dwarf <b>stars</b>, i.e.&nbsp;... The revised Yerkes Atlas system (Johnson &amp; Morgan 1953) listed 12 K-type 
dwarf <b>spectral</b> standard <b>stars</b>,&nbsp;... An O-type <b>star</b> is a hot, blue-white <b>star</b> of <b>spectral</b> type O in the Yerkes 
classification system employed by astronomers. They have temperatures in 
excess of&nbsp;... The &quot;anchor points&quot; of the MK <b>spectral</b> classification system among the B-type 
main-sequence dwarf <b>stars</b>, i.e.&nbsp;... The revised Yerkes Atlas system listed a dense grid of A-type dwarf <b>spectral</b> 
standard <b>stars</b>, but not all of these&nbsp;... An important review on <b>spectral</b> classification by ... than O5 were not defined with 
standard <b>stars</b> until the 1970s. See Morgan-Keenan <b>spectral</b> classification. Wikimedia Commons has media 
related to <b>Stars</b> by <b>spectral</b> type. ... B. ▻ B-type <b>stars</b>‎ (11 C, 10 P)&nbsp;... Astronomical spectroscopy is the study of astronomy using the techniques of 
spectroscopy to measure the spectrum of electromagnetic radiation, including 
visible light and radio, which radiates from <b>stars</b> and other celestial objects. A 
stellar spectrum can reveal many properties of <b>stars</b>, such as their chemical ... 
Their <b>spectra</b> are the same as the <b>stars</b> surrounding them, though the light is&nbsp;...
ionization state
Stellar classification