{"id":13192,"date":"2016-09-13T10:42:32","date_gmt":"2016-09-13T14:42:32","guid":{"rendered":"http:\/\/hobbyspace.com\/Blog\/?p=13192"},"modified":"2016-09-12T21:10:45","modified_gmt":"2016-09-13T01:10:45","slug":"hubble-observes-star-reverse-from-up-to-down-in-temperature","status":"publish","type":"post","link":"https:\/\/hobbyspace.com\/Blog\/?p=13192","title":{"rendered":"Hubble observes star reverse from up to down in temperature"},"content":{"rendered":"<p>A report from a team using the\u00a0<a href=\"https:\/\/www.spacetelescope.org\/\" target=\"_blank\">Hubble telescope<\/a>:<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"https:\/\/www.spacetelescope.org\/news\/heic1618\/?lang\" target=\"_blank\">Astronomers observe star reborn in a flash<\/a>\u00a0<\/strong><\/p>\n<figure id=\"attachment_13193\" aria-describedby=\"caption-attachment-13193\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.spacetelescope.org\/images\/heic1618a\/\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"13193\" data-permalink=\"https:\/\/hobbyspace.com\/Blog\/?attachment_id=13193\" data-orig-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618a1.jpg\" data-orig-size=\"700,700\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;ESA\/Hubble \\u0026amp; NASA&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;This image of the Stingray nebula, a planetary nebula 2700 light-years from Earth, was taken with the Wide Field and Planetary Camera 2 (WFPC2) in 1998. In the centre of the nebula the fast evolving star SAO 244567 is located. Observations made within the last 45 years showed that the surface temperature of the star increased by almost 40 000 degree Celsius. Now new observations of the spectra of the star have revealed that SAO 244567 has started to cool again.&quot;,&quot;created_timestamp&quot;:&quot;1473782400&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;Stingray Nebula and SAO 244567&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Stingray Nebula and SAO 244567\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;This image of the Stingray nebula, a planetary nebula 2700 light-years from Earth, was taken with the Wide Field and Planetary Camera 2 (WFPC2) in 1998. In the centre of the nebula the fast evolving star SAO 244567 is located. Observations made within the last 45 years showed that the surface temperature of the star increased by almost 40 000 degree Celsius. Now new observations of the spectra of the star have revealed that SAO 244567 has started to cool again.&lt;\/p&gt;\n\" data-medium-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618a1-300x300.jpg\" data-large-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618a1.jpg\" class=\"wp-image-13193\" src=\"http:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618a1.jpg\" alt=\"This image of the Stingray nebula, a planetary nebula 2700 light-years from Earth, was taken with the Wide Field and Planetary Camera 2 (WFPC2) in 1998. In the centre of the nebula the fast evolving star SAO 244567 is located. Observations made within the last 45 years showed that the surface temperature of the star increased by almost 40 000 degree Celsius. Now new observations of the spectra of the star have revealed that SAO 244567 has started to cool again.\" width=\"500\" height=\"500\" srcset=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618a1.jpg 700w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618a1-150x150.jpg 150w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618a1-300x300.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-13193\" class=\"wp-caption-text\"><em>This image of the Stingray nebula, a planetary nebula 2700 light-years from Earth, was taken with the Wide Field and Planetary Camera 2 (WFPC2) in 1998. In the centre of the nebula the fast evolving star SAO 244567 is located. Observations made within the last 45 years showed that the surface temperature of the star increased by almost 40 000 degree Celsius. Now new observations of the spectra of the star have revealed that SAO 244567 has started to cool again.<\/em><\/figcaption><\/figure>\n<p>Over a period of 30 years dramatic increases in the temperature of the star SAO 244567 have been observed. Now the star is cooling again, having been reborn into an earlier phase of stellar evolution. This makes it the first reborn star to have been observed during both the heating and cooling stages of rebirth.<\/p>\n<p><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"1600\" height=\"900\" src=\"https:\/\/www.youtube.com\/embed\/0YQk45LeOOM?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/p>\n<p style=\"padding-left: 30px;\"><em>This animation shows the fast evolution of SAO 244567. The animation starts 10 300 BC, with the star having a radius 152 times the size of the Sun and a surface temperature of about 3500 degree Celsius, giving it its orange colour. At this point of its life the star had already lost half of its initial mass.<\/em><\/p>\n<p style=\"padding-left: 30px;\"><em>After 10 000 years the star slowly shrinks to only 40 times the size of the Sun; at the same time its temperature rises to 6800 degree Celsius, causing its colour to change to white-yellow.\u00a0As the star heats up to about 20 000 degree Celsius Helium fusion inside the star suddenly gets re-ignited \u2014 the late thermal pulse.<\/em><\/p>\n<p style=\"padding-left: 30px;\"><em>After the flash the star heats quickly and becomes a blue-white star with a temperature of 21 000 degree Celsius, only 4 times larger than the Sun. SAO 244567 shrinks further till it only a third the size of the Sun and a temperature of 60 000 degree Celsius; this status was reached in the year 2002. Now new observations show that the star is still blue and hot \u2014 with about 50 000 degree Celsius \u2014 but started to expand again: its size is about two third of our Sun.<\/em><\/p>\n<p style=\"padding-left: 30px;\"><em>Within the next few hundreds of years SAO 244567 will expand back to its giant dimensions and also change its colour to orange \u2014 as shown at the end of the animation.\u00a0<strong>Credit:\u00a0<\/strong>ESA\/Hubble, L. Cal\u00e7ada<\/em><\/p>\n<p>Even though the Universe is constantly changing, most processes are too slow to be observed within a human lifespan. But now an international team of astronomers have observed an exception to this rule.<\/p>\n<p style=\"padding-left: 30px;\"><em>\u201cSAO 244567 is one of the rare examples of a star that allows us to witness stellar evolution in real time\u201d<\/em>, explains Nicole Reindl from the University of Leicester, UK, lead author of the study. <em>\u201cOver only twenty years the star has doubled its temperature and it was possible to watch the star ionising its previously ejected envelope, which is now known as the Stingray Nebula.\u201d<\/em><\/p>\n<p>SAO 244567, 2700 light-years from Earth, is the central star of the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Stingray_Nebula\" target=\"_blank\">Stingray Nebula<\/a> and has been visibly evolving between observations made over the last 45 years. Between 1971 and 2002 the surface temperature of the star skyrocketed by almost 40 000 degrees Celsius. Now new observations made with the <a href=\"https:\/\/www.spacetelescope.org\/about\/general\/instruments\/cos\/\" target=\"_blank\">Cosmic Origins Spectrograph (COS)<\/a> on the NASA\/ESA Hubble Space Telescope have revealed that SAO 244567 has started to cool and expand.<\/p>\n<p>This is unusual, though not unheard-of <a href=\"#1\">[1]<\/a>, and the rapid heating could easily be explained if one assumed that SAO 244567 had an initial mass of 3 to 4 times the mass of the Sun. However, the data show that SAO 244567 must have had an original mass similar to that of our Sun. Such low-mass stars usually evolve on much longer timescales, so the rapid heating has been a mystery for decades.<\/p>\n<p>Back in 2014 Reindl and her team proposed a theory that resolved the issue of both SAO 244567\u2019s rapid increase in temperature as well as the low mass of the star. They suggested that the heating was due to what is known as a helium-shell flash event: a brief ignition of helium outside the stellar core <a href=\"#2\">[2]<\/a>.<\/p>\n<figure id=\"attachment_13194\" aria-describedby=\"caption-attachment-13194\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.spacetelescope.org\/images\/heic1618b\/\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"13194\" data-permalink=\"https:\/\/hobbyspace.com\/Blog\/?attachment_id=13194\" data-orig-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618b1.jpg\" data-orig-size=\"700,394\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;ESA\/Hubble \\u0026amp; NASA&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;This artist\\u2019s impression shows a still from the video showing the evolution of SAO 244567\\u2019s rapid evolution.&quot;,&quot;created_timestamp&quot;:&quot;1473782400&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;SAO 244567&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"SAO 244567\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;This artist\u2019s impression shows a still from the video showing the evolution of SAO 244567\u2019s rapid evolution.&lt;\/p&gt;\n\" data-medium-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618b1-300x169.jpg\" data-large-file=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618b1.jpg\" class=\"wp-image-13194\" src=\"http:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618b1.jpg\" alt=\"This artist\u2019s impression shows a still from the video showing the evolution of SAO 244567\u2019s rapid evolution.\" width=\"500\" height=\"281\" srcset=\"https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618b1.jpg 700w, https:\/\/hobbyspace.com\/Blog\/wp-content\/uploads\/2016\/09\/heic1618b1-300x169.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><figcaption id=\"caption-attachment-13194\" class=\"wp-caption-text\">This artist\u2019s impression shows a still from the video showing the evolution of SAO 244567\u2019s rapid evolution.<\/figcaption><\/figure>\n<p>This theory has very clear implications for SAO 244567\u2019s future: if it has indeed experienced such a flash, then this would force the central star to begin to expand and cool again \u2014 it would return back to the previous phase of its evolution. This is exactly what the new observations confirmed. As Reindl explains:<\/p>\n<p style=\"padding-left: 30px;\"><em>\u201cThe release of nuclear energy by the flash forces the already very compact star to expand back to giant dimensions \u2014 the born-again scenario.\u201d<\/em><\/p>\n<p>It is not the only example of such a star, but it is the first time ever that a star has been observed during both the heating and cooling stages of such a transformation.<\/p>\n<p>Yet no current stellar evolutionary models can fully explain SAO 244567\u2019s behaviour. As Reindl elaborates:<\/p>\n<p style=\"padding-left: 30px;\"><em>\u201cWe need refined calculations to explain some still mysterious details in the behaviour of SAO 244567. These could not only help us to better understand the star itself but could also provide a deeper insight in the evolution of central stars of planetary nebulae.\u201d<\/em><\/p>\n<p>Until astronomers develop more refined models for the life cycles of stars, aspects of SAO 244567\u2019s evolution will remain a mystery.<\/p>\n<p><strong>Notes<\/strong><\/p>\n<p><a class=\"anchor\" name=\"1\"><\/a>[1] The other star thought to have experienced the same type of helium flash event (see<a class=\"anchor\" name=\"2\"><\/a>[2]) is <a href=\"https:\/\/en.wikipedia.org\/wiki\/FG_Sagittae\" target=\"_blank\">FG Sagittae<\/a>, located in the constellation <a href=\"https:\/\/en.wikipedia.org\/wiki\/Sagitta\" target=\"_blank\">Sagitta<\/a>, making SAO 244567 the second of its kind. However, other objects undergoing similar \u201cborn-again\u201d scenarios are known, including <a href=\"https:\/\/en.wikipedia.org\/wiki\/Sakurai%27s_Object\" target=\"_blank\">Sakurai\u2019s Object<\/a>, located in <a href=\"https:\/\/en.wikipedia.org\/wiki\/Sagittarius_(constellation)\" target=\"_blank\">Sagittarius<\/a>.<\/p>\n<p><a class=\"anchor\" name=\"2\"><\/a>[2] Helium flash events, also known as late thermal pulses, occur late in the evolution of about 25% of low- to medium-mass stars. After evolving off the main sequence, these stars enter the red giant phase, where the star expands dramatically. Various changes occur in the star\u2019s chemical and physical composition during this phase, until it has burnt most of the helium available in its core, which is by then composed of carbon and oxygen. Helium fusion continues in a thin shell around the core, but then turns off as the helium becomes depleted. This allows hydrogen fusion to start in a layer above the helium layer. After enough additional helium accumulates, helium fusion is reignited, leading to a thermal pulse which eventually causes the star to expand, cool and brighten temporarily.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A report from a team using the\u00a0Hubble telescope: Astronomers observe star reborn in a flash\u00a0 Over a period of 30 years dramatic increases in the temperature of the star SAO 244567 have been observed. Now the star is cooling again, having been reborn into an earlier phase of stellar evolution. This makes it the first &hellip; <a href=\"https:\/\/hobbyspace.com\/Blog\/?p=13192\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Hubble observes star reverse from up to down in temperature<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-13192","post","type-post","status-publish","format-standard","hentry","category-astronomy"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p34aWK-3qM","jetpack-related-posts":[{"id":12527,"url":"https:\/\/hobbyspace.com\/Blog\/?p=12527","url_meta":{"origin":13192,"position":0},"title":"Hubble captures marvelous view of the Bubble Nebula to celebrate 26 years in orbit","author":"TopSpacer","date":"April 21, 2016","format":false,"excerpt":"ESA\/Hubble\u00a0celebrates 26 years in orbit with a wonderful new image of the\u00a0Bubble Nebula. 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