{"id":1680,"date":"2009-12-13T08:41:00","date_gmt":"2009-12-13T08:41:00","guid":{"rendered":"http:\/\/euvolution.com\/futurist-transhuman-news-blog\/sooty-stars\/"},"modified":"2009-12-13T08:41:00","modified_gmt":"2009-12-13T08:41:00","slug":"sooty-stars","status":"publish","type":"post","link":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/astronomy\/sooty-stars.php","title":{"rendered":"Sooty Stars"},"content":{"rendered":"

The term “sooty star” or “carbon star” almost makes them sound like big chunks of coal.  You know that <\/em>wouldn’t work.  In the interest of brevity, quick definition of a carbon star is an evolved giant (or sometimes a dwarf) with circumstellar “clouds” of carbon dust.  It’s seeing the star through this atmosphere of carbon that gives it its red appearance; because carbon absorbs “blue” light.  Classical carbon stars are massive; non-classical less so.  Most are long-period variables.<\/p>

\"http:\/\/euvolution.com\/futurist-transhuman-news-blog\/wp-content\/plugins\/wp-o-matic\/cache\/6bff0_LaSuperba_parkercarboni.jpg\"
Image:  Greg Parker, New Forest Observatory<\/p>

This is an image of La Superba – Y Canum Venaticorum (Y CVn), one of the reddest stars in the sky, and among the brightest of the red giants.  It’s a semi-regular variable carbon star.<\/p>

\"See
Image:  H. Olafsson, Stockholm Observatory (et al)<\/p>

This is TT Cygni.  The ring you see around the star is a shell of gas expanding outward.<\/p>

Classical carbon stars are single giants at the end of their lifespan.  Non-classical carbon stars are those in a binary system where one is a white dwarf and the other a red giant.  The giant accreted carbon from its companion, now the dwarf, to become the carbon star.<\/p>

Carbon stars are somewhat rare, and they quickly evolve out of this phase because they lose tremendous amounts of mass.  Their carbon “shell” becomes part of the interstellar dust; providing the raw materials for the creation of new generations of stars and planets.<\/p>","protected":false},"excerpt":{"rendered":"

The term “sooty star” or “carbon star” almost makes them sound like big chunks of coal.  You know that wouldn’t work.  In the interest of brevity, quick definition of a carbon star is an evolved giant (or sometimes a dwarf) … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"limit_modified_date":"","last_modified_date":"","_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[21],"tags":[],"class_list":["post-1680","post","type-post","status-publish","format-standard","hentry","category-astronomy"],"modified_by":null,"_links":{"self":[{"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/posts\/1680"}],"collection":[{"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/comments?post=1680"}],"version-history":[{"count":0,"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/posts\/1680\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/media?parent=1680"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/categories?post=1680"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.euvolution.com\/futurist-transhuman-news-blog\/wp-json\/wp\/v2\/tags?post=1680"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}