{"id":5629,"date":"2024-02-21T10:32:28","date_gmt":"2024-02-21T10:32:28","guid":{"rendered":"https:\/\/msealey.co.uk\/K12-Journeys\/?post_type=lesson&#038;p=5629"},"modified":"2024-03-19T07:13:23","modified_gmt":"2024-03-19T07:13:23","slug":"stellar-classification","status":"publish","type":"lesson","link":"https:\/\/msealey.co.uk\/K12-Journeys\/lesson\/stellar-classification\/","title":{"rendered":"Stellar Classification"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-f56f613f wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><div class=\"class-box class-image\">\r\n\t<ul class=\"data-list\">\r\n\t\t<li>\r\n\t\t\t<a class=\"\" title=\"Journey deeper into Space\" href=\"https:\/\/msealey.co.uk\/K12-Journeys\/journeys\/journey-deeper-into-space\/\" rel=\"noopener\">\r\n\t\t\t\r\n\t\t\t\t<img decoding=\"async\" class=\"class-logo medium\" src=\"https:\/\/msealey.co.uk\/K12-Journeys\/wp-content\/uploads\/2023\/07\/Journey_deeper_into_Space-Tall.png\" alt=\"Journey deeper into Space\" title=\"Journey deeper into Space\" \/>\r\n\t\t\t\r\n\t\t\t<\/a>\r\n\t\t<\/li>\r\n\t<\/ul>\r\n<\/div>\r\n\r\n<!--<div class=\"class-box\">\r\n\t<h2 class=\"class-title\">Stellar Classification<\/h2>\r\n<\/div>-->\r\n\r\n<h4 class=\"wp-block-heading class-header\">Key Information<\/h4>\r\n\r\n<div class=\"class-box\">\r\n\t<h3 class=\"class-title\">Stellar Classification<\/h3>\r\n\t<figure class=\"wp-block-table info-table\">\r\n\t\t<div class=\"table-wrapper\">\r\n\t\t\t<table class=\"class-table\">\r\n\t\t\t\t<tbody>\r\n\t\r\n\t\t\t\t<tr>\r\n\t\t\t\t\t<td class=\"class-table-title\">Type<\/td>\r\n\t\t\t\t\t<td>Method to Categorise Stars<\/td>\r\n\t\t\t\t<\/tr>\r\n\t\r\n\t\t\t\t<tr>\r\n\t\t\t\t\t<td class=\"class-table-title\">Key Classifications<\/td>\r\n\t\t\t\t\t<td>Harvard System; Morgan-Keenan System<\/td>\r\n\t\t\t\t<\/tr>\r\n\t\r\n\t\t\t\t<\/tbody>\r\n\t\t\t<\/table>\r\n\t\t<\/div>\r\n\t<\/figure>\r\n<\/div>\r\n\r\n<h4 class=\"wp-block-heading class-header\">Learning Point<\/h4>\r\n\r\n<div class=\"class-box\">\r\n\t<ul>\n<li><strong>Stars <\/strong>vary in <strong>size<\/strong>, <strong>brightness<\/strong>, <strong>colour <\/strong>and <strong>power<\/strong>. <strong>Categorising <\/strong>them helps us to <strong>understand how they relate to each other<\/strong>, giving us a greater understanding of each star we see in the night sky. The main way of categorising them is through the <strong>Morgan-Keenan system<\/strong>, which includes looking at the <strong>type of light a star produces<\/strong>, and <strong>what it contains<\/strong> within it.<\/li>\n<\/ul>\n\r\n<\/div>\r\n\r\n<h4 class=\"wp-block-heading class-header\">Project<\/h4>\r\n\r\n<div class=\"class-box\">\r\n\t<ul>\n<li>Work out how the following letters should be ordered correctly, and the colour they represent:<\/li>\n<li><strong><em>A, B, F, G, K, L, M, O, T, Y<\/em><\/strong><\/li>\n<\/ul>\n\r\n<\/div>\r\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<div class=\"wp-block-gutena-tabs gutena-tabs-block gutena-tabs-block-b814f7-33 class-container class-tab\"><ul class=\"gutena-tabs-tab tab-flex\"><li class=\"gutena-tab-title active\" data-tab=\"1\"><div class=\"gutena-tab-title-content icon-top\"><div class=\"gutena-tab-title-text\"><div>Overview<\/div><\/div><\/div><\/li><li class=\"gutena-tab-title inactive\" data-tab=\"2\"><div class=\"gutena-tab-title-content icon-top\"><div class=\"gutena-tab-title-text\"><div>Morgan-Keenan Classification<\/div><\/div><\/div><\/li><\/ul><div class=\"gutena-tabs-content is-layout-flow wp-block-gutena-tabs-is-layout-flow\">\n<div class=\"wp-block-gutena-tab gutena-tab-block gutena-tab-block-39418d-d6 active class-box class-image\" data-tab=\"1\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/msealey.co.uk\/K12-Journeys\/wp-content\/uploads\/2024\/02\/Star_Classification-1024x576.png\" alt=\"Star Classifications\" class=\"wp-image-5763\" srcset=\"https:\/\/msealey.co.uk\/K12-Journeys\/wp-content\/uploads\/2024\/02\/Star_Classification-1024x576.png 1024w, https:\/\/msealey.co.uk\/K12-Journeys\/wp-content\/uploads\/2024\/02\/Star_Classification-300x169.png 300w, https:\/\/msealey.co.uk\/K12-Journeys\/wp-content\/uploads\/2024\/02\/Star_Classification-768x432.png 768w, https:\/\/msealey.co.uk\/K12-Journeys\/wp-content\/uploads\/2024\/02\/Star_Classification-1536x864.png 1536w, https:\/\/msealey.co.uk\/K12-Journeys\/wp-content\/uploads\/2024\/02\/Star_Classification.png 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-gutena-tab gutena-tab-block gutena-tab-block-f572f4-6c inactive class-box class-image\" data-tab=\"2\">\n<figure class=\"wp-block-table is-style-regular\"><table class=\"has-pale-cyan-blue-background-color has-background has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Class<\/th><th>Effective Temperature<\/th><th>Vega-relative Chromacity<\/th><th>Chromacity (D65)<\/th><th>Main-Sequence Mass<\/th><th>Main-Sequence Radius<\/th><th>Main-Sequence Luminosity<\/th><th>Hydrogen Lines<\/th><th>Fraction of all Main-Sequence Stars<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">O<\/td><td>> 33,000 K<\/td><td>blue<\/td><td>blue<\/td><td>&gt; 16 M<sub>\u2609<\/sub><\/td><td>> 6.6 R<sub>\u2609<\/sub><\/td><td>> 30,000 L<sub>\u2609<\/sub><\/td><td>Weak<\/td><td>0.00003%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">B<\/td><td>10,000 &#8211; 33,000 K<\/td><td>bluish white<\/td><td>deep bluish white<\/td><td>2.1 &#8211; 16 M<sub>\u2609<\/sub><\/td><td>1.8 &#8211; 6.6 R<sub>\u2609<\/sub><\/td><td>25 &#8211; 30,000 L<sub>\u2609<\/sub><\/td><td>Medium<\/td><td>0.12%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">A<\/td><td>7,300 &#8211; 10,000 K<\/td><td>white<\/td><td>bluish white<\/td><td>1.4 &#8211; 2.1 M<sub>\u2609<\/sub><\/td><td>1.4 to 1.8 R<sub>\u2609<\/sub><\/td><td>5 &#8211; 25 L<sub>\u2609<\/sub><\/td><td>Strong<\/td><td>0.61%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">F<\/td><td>6,000 &#8211; 7,300 K<\/td><td>yellowish white<\/td><td>white<\/td><td>1.04 &#8211; 1.4 M<sub>\u2609<\/sub><\/td><td>1.15 &#8211; 1.4 R<sub>\u2609<\/sub><\/td><td>1.5 &#8211; 5 L<sub>\u2609<\/sub><\/td><td>Medium<\/td><td>3.0%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">G<\/td><td>5,300 &#8211; 6,000 K<\/td><td>yellow<\/td><td>yellowish white<\/td><td>0.8 &#8211; 1.04 M<sub>\u2609<\/sub><\/td><td>0.96 &#8211; 1.15 R<sub>\u2609<\/sub><\/td><td>0.6 &#8211; 1.5 L<sub>\u2609<\/sub><\/td><td>Weak<\/td><td>7.6%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">K<\/td><td>3,900 &#8211; 5,300<\/td><td>light orange<\/td><td>pale yellowish orange<\/td><td>0.4 &#8211; 0.8 M<sub>\u2609<\/sub><\/td><td>0.7 &#8211; 0.96 R<sub>\u2609<\/sub><\/td><td>0.08 &#8211; 0.6 L<sub>\u2609<\/sub><\/td><td>Very weak<\/td><td>12%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">M<\/td><td>2,300 &#8211; 3,900 K<\/td><td>orangish red<\/td><td>light orangish red<\/td><td>0.08 &#8211; 0.45 M<sub>\u2609<\/sub><\/td><td>&lt;0.7 R<sub>\u2609<\/sub><\/td><td>&lt; 0.08 L<sub>\u2609<\/sub><\/td><td>Very weak<\/td><td>76%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">L<\/td><td>1,300 &#8211; 2,300 K<\/td><td>orangish red<\/td><td>red<\/td><td>0.07 &#8211; 0.085 M<sub>\u2609<\/sub><\/td><td>0.088 &#8211; 0.11 R<sub>\u2609<\/sub><\/td><td>0.00006 &#8211; 0.00031 L<sub>\u2609<\/sub><\/td><td><\/td><td><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">T<\/td><td>550 &#8211; 1,300 K<\/td><td>red<\/td><td>deep red<\/td><td>13 &#8211; 65 M<sub>J<\/sub><\/td><td><\/td><td><\/td><td><\/td><td><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Y<\/td><td>&lt; 500 K<\/td><td>deep red<\/td><td>deep red<\/td><td>9 &#8211; 25 M<sub>J<\/sub><\/td><td><\/td><td><\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Wikipedia &#8211; <a href=\"https:\/\/en.wikipedia.org\/wiki\/Stellar_classification\">Stellar Classification<\/a><\/figcaption><\/figure>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\">\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\r\n\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading class-header\">Fun Facts<\/h4>\r\n\r\n<div class=\"class-box\">\r\n\t<ul>\n<li>In the <strong>1860s <\/strong>the <strong>Italian astronomer Angelo Secchi<\/strong> distinguished <strong>four<\/strong> main <strong>spectral types<\/strong> of stars.<\/li>\n<li>The types were rearranged in a <strong>non-alphabetic<\/strong> <strong>sequence <\/strong>to put them in order by <strong>surface temperature<\/strong>.<\/li>\n<li><strong>Grades I <\/strong>(for supergiants), <strong>II <\/strong>(bright giants), <strong>III <\/strong>(normal giants), <strong>IV <\/strong>(subgiants), and <strong>V <\/strong>(main sequence, or dwarf, stars)<\/li>\n<li>The <strong>Sun<\/strong>, a <strong>yellow dwarf<\/strong> star of some <strong>5,800 K<\/strong>, is designated <strong>G2 V<\/strong>.<\/li>\n<\/ul>\n\r\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-f56f613f wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><h4 class=\"wp-block-heading class-header\">Past Lessons<\/h4>\r\n\r\n<div class=\"class-box\">\r\n\t<figure class=\"wp-block-table info-table\">\r\n\t\t<div class=\"table-wrapper\">\r\n\t\t\t<table class=\"class-list\">\r\n\t\t\t\t<tbody>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\r\n\t\t\t\t\t<tr>\r\n\t\t\t\t\t\t<td class=\"icon\">82<\/td>\r\n\t\t\t\t\t\t<td class=\"class-table-title\">March 11, 2024<\/td>\r\n\t\t\t\t\t\t<td>(North America)<\/td>\r\n\t\t\t\t\t<\/tr>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\r\n\t\t\t\t\t<tr class=\"hide-this-row\">\r\n\t\t\t\t\t\t<td colspan=\"3\">No Past Lessons<\/td>\r\n\t\t\t\t\t<\/tr>\r\n\t\t\t\t<\/tbody>\r\n\t\t\t<\/table>\r\n\t\t<\/div>\r\n\t<\/figure>\r\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\r\n<h4 class=\"wp-block-heading class-header\">Upcoming Lessons<\/h4>\r\n\r\n<div class=\"class-box\">\r\n\t<figure class=\"wp-block-table info-table\">\r\n\t\t<div class=\"table-wrapper\">\r\n\t\t\t<table class=\"class-list\">\r\n\t\t\t\t<tbody>\r\n\r\n\t\t\t\t\t\r\n\t\t\t\t\t\r\n\t\t\t\t\t\r\n\r\n\t\t\t\t\t<tr class=\"hide-this-row\">\r\n\t\t\t\t\t\t<td colspan=\"3\">No Upcoming Lessons<\/td>\r\n\t\t\t\t\t<\/tr>\r\n\t\t\t\t<\/tbody>\r\n\t\t\t<\/table>\r\n\t\t<\/div>\r\n\t<\/figure>\r\n<\/div>\r\n<\/div>\n<\/div>\n","protected":false},"featured_media":0,"template":"","class_list":["post-5629","lesson","type-lesson","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/msealey.co.uk\/K12-Journeys\/wp-json\/wp\/v2\/lesson\/5629","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/msealey.co.uk\/K12-Journeys\/wp-json\/wp\/v2\/lesson"}],"about":[{"href":"https:\/\/msealey.co.uk\/K12-Journeys\/wp-json\/wp\/v2\/types\/lesson"}],"wp:attachment":[{"href":"https:\/\/msealey.co.uk\/K12-Journeys\/wp-json\/wp\/v2\/media?parent=5629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}