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<h2 align=center><b>Spectral (Stellar) Classification Ssystem</b></h2> | |||
<P><font size="2">The original version of the current MK system | |||
was defined by Morgan, Keenan, and Kellman (1943), and a revised | |||
list of standards was published in 1953 by Morgan and Johnson. | |||
Additional refinements have been added since then.</font></P> | |||
<P align=center><b>MK Spectral Classification System (Standard)</b></P> | |||
<P align=center> | <P align=center> | ||
<CENTER> | <CENTER> | ||
<TABLE borderColor=#008080 cellSpacing=4 cellPadding=1 | <TABLE borderColor=#008080 cellSpacing=4 cellPadding=1 width=578 border=1> | ||
width= | |||
<TR> | <TR> | ||
<TD vAlign=center width=" | <TD vAlign=center width="23%"> <h5 align=center><b>Class</b></h5></TD> | ||
<TD vAlign=center width="23%"> <h5 align=center><b>Color</b></h5></TD> | |||
align=center><b> | <TD vAlign=center width="23%"> <h5 align=center><b>Temperature | ||
(K)</b></h5></TD> | |||
<TD vAlign=center width=" | |||
align=center><b> | |||
<TD vAlign=center width=" | |||
align=center>< | <TD vAlign=center width="53%"> <h5 align=center><strong>Composition</strong></h5></TD> | ||
</TR> | </TR> | ||
<TR> | <TR> | ||
<TD vAlign=center width="12%"> <P | <TD vAlign=center width="12%"> <P align=center>O</P></TD> | ||
<TD vAlign=center width="13%"> <P align=center>Dark Blue</P></TD> | |||
align=center> | <TD vAlign=center width="23%"> <P align=center>28,000-50,000</P></TD> | ||
<TD vAlign=center width=" | |||
<TD vAlign=center width=" | |||
align=center> | <TD vAlign=center width="53%"> <P align=center>ionized atoms, | ||
especially helium</P></TD> | |||
</TR> | </TR> | ||
<TR> | <TR> | ||
<TD vAlign=center width="12%"> <P | <TD vAlign=center width="12%"> <P align=center>B</P></TD> | ||
<TD vAlign=center width="13%"> <P align=center>Blue</P></TD> | |||
<TD vAlign=center width="23%"> <P align=center>10,000-28,000</P></TD> | |||
<TD vAlign=center width="53%"> <P align=center>neutral helium, | |||
<TD vAlign=center width=" | some hydrogen</P></TD> | ||
</TR> | |||
align=center> | |||
<TR> | <TR> | ||
<TD vAlign=center width="12%"> <P | <TD vAlign=center width="12%"> <P align=center>A</P></TD> | ||
<TD vAlign=center width="13%"> <P align=center>Light Blue</P></TD> | |||
<TD vAlign=center width="23%"> <P align=center>7,500-10,000</P></TD> | |||
<TD vAlign=center width="53%"> <P align=center>strong hydrogen, | |||
<TD vAlign=center width=" | some ionized metals</P></TD> | ||
</TR> | |||
<TR> | <TR> | ||
<TD vAlign=center width="12%"> <P | <TD vAlign=center width="12%"> <P align=center>F</P></TD> | ||
<TD vAlign=center width="13%"> <P align=center>White</P></TD> | |||
<TD vAlign=center width="23%"> <P align=center>6,000-7,500</P></TD> | |||
<TD vAlign=center width="53%"> <P align=center>hydrogen | |||
<TD vAlign=center width=" | and ionized metals; calcium and iron</P></TD> | ||
</TR> | |||
align=center> | |||
<TR> | <TR> | ||
<TD vAlign=center width="12%"> <P | <TD vAlign=center width="12%"> <P align=center>G</P></TD> | ||
<TD vAlign=center width="13%"> <P align=center>Yellow</P></TD> | |||
<TD vAlign=center width="23%"> <P align=center>5,000-6,000</P></TD> | |||
<TD vAlign=center width="53%"> <P align=center>ionized calcium; | |||
<TD vAlign=center width=" | both neutral and ionized metals</P></TD> | ||
</TR> | |||
align=center> | |||
<TR> | <TR> | ||
<TD vAlign=center width="12%"> <P | <TD vAlign=center width="12%"> <P align=center>K</P></TD> | ||
<TD vAlign=center width="13%"> <P align=center>Orange</P></TD> | |||
<TD vAlign=center width="23%"> <P align=center>3,500-5,000</P></TD> | |||
<TD vAlign=center width="53%"> <P align=center>Neutral metals</P></TD> | |||
</TR> | |||
<TD vAlign=center width=" | |||
align=center> | |||
<TR> | <TR> | ||
<TD vAlign=center width="12%"> <P | <TD vAlign=center width="12%"> <P align=center>M</P></TD> | ||
<TD vAlign=center width="13%"> <P align=center>Red</P></TD> | |||
<TD vAlign=center width="23%"> <P align=center>2,500-3,500</P></TD> | |||
<TD vAlign=center width="53%"> <P align=center>Strong molecules; | |||
titanium oxide, neutral calcium</P></TD> | |||
</TR> | |||
<TD vAlign=center width=" | |||
align=center> | |||
</TABLE> | </TABLE> | ||