{"id":12871,"date":"2024-04-07T14:55:00","date_gmt":"2024-04-07T14:55:00","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/des-etoiles-zombies-situees-pres-du-trou-noir-central-de-notre-galaxie-semblent-rajeunir"},"modified":"2024-04-08T04:21:38","modified_gmt":"2024-04-08T04:21:38","slug":"des-etoiles-zombies-situees-pres-du-trou-noir-central-de-notre-galaxie-semblent-rajeunir","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/des-etoiles-zombies-situees-pres-du-trou-noir-central-de-notre-galaxie-semblent-rajeunir","title":{"rendered":"Des \u00e9toiles zombies, situ\u00e9es pr\u00e8s du trou noir central de notre galaxie, semblent rajeunir"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>C\u2019est un quartier dense\u0301ment peuple\u0301 et anime\u0301 d\u2019objets qui se de\u0301placent a\u0300 des milliers de kilome\u0300tres par seconde, pour certains. La re\u0301gion autour du trou noir central de la galaxie, Sagittarius A* (Sgr A*), est peuple\u0301 de plus d\u2019un million d\u2019e\u0301toiles entraine\u0301es dans une ronde effre\u0301ne\u0301e par le champ gravitationnel de ce dernier. Ce faisant, elles entrent parfois en collision les unes avec les autres et de ces violents chocs sont issus des astres dont la nature varie en fonction de la distance a\u0300 laquelle elles se sont te\u0301lescope\u0301es, re\u0301ve\u0300le une recherche mene\u0301e par l\u2019Universite\u0301 Northwestern, aux Etats-Unis.<\/p>\n

Des e\u0301toiles de\u0301pouille\u0301es et de faible masse<\/b><\/p>\n

Ce travail a e\u0301te\u0301 dirige\u0301 par Sanaea C. Rose qui a pre\u0301sente\u0301 ses re\u0301sultats, ce 4 avril 2024, lors d\u2019une confe\u0301rence de la Socie\u0301te\u0301 Ame\u0301ricaine de Physique qui s\u2019est de\u0301roule\u0301e a\u0300 Sacramento, en Californie. Il s\u2019appuie e\u0301galement sur deux publications ante\u0301rieures, dont elle est premier auteure, en mars 2024 dans les Astrophysical Journal Letters, et en septembre 2023 dans The Astrophysical Journal. L\u2019astrophysicienne, avec ses collaborateurs, a de\u0301veloppe\u0301 une simulation pour retracer le destin des e\u0301toiles proches de Sgr A* ; elle prend en compte plusieurs facteurs: densite\u0301 de l\u2019amas stellaire, masse des e\u0301toiles, vitesse d\u2019orbite, gravite\u0301 et distances au trou noir central.<\/p>\n

Lire aussiBillard cosmique au centre de la galaxie<\/b><\/p>\n

Mais le facteur qui apparai\u0302t e\u0302tre le plus influent est la distance au trou noir: les astres situe\u0301s a\u0300 moins de 0,01 parsec (1 pc = 3,26 al) sont les plus ve\u0301loces et ils entrent fre\u0301quemment en collision. Mais ils sont anime\u0301s d\u2019une telle vitesse qu\u2019ils rebondissent les uns sur les autres a\u0300 la manie\u0300re de boules de billard, d\u2019autant plus que les chocs sont rarement frontaux. Dans ce processus, les objets stellaires concerne\u0301s e\u0301jectent de la matie\u0300re et peuvent perdre une grande partie de leurs couches externes, laissant ainsi au centre de la galaxie une population d\u2019e\u0301toiles e\u0301tranges, de\u0301pouille\u0301es et de faible masse.<\/p>\n

Des e\u0301toiles zombies plus lointaines<\/b><\/p>\n

Au-dela\u0300 de 0,01 parsec, les e\u0301toiles se de\u0301placent moins vite, a\u0300 quelques centaines de kilome\u0300tres par seconde au lieu de milliers de km\/s. En raison de leurs vitesses plus lentes, quand elles entrent en collision, elles n\u2019ont pas assez d\u2019e\u0301nergie pour \u201crebondir\u201d et elles fusionnent pour devenir plus massives. Selon les simulations, certaines peuvent fusionner plusieurs fois et ainsi atteindre une masse dix fois supe\u0301rieure a\u0300 celle du Soleil. Lors de ces unions, ces e\u0301toiles (a\u0302ge\u0301es pour la plupart) re\u0301coltent aussi de grandes quantite\u0301s d\u2019hydroge\u0300ne.<\/p>\n

Ce qui fait qu\u2019elles affichent des profils similaires a\u0300 de jeunes e\u0301toiles dans les releve\u0301s spectrographiques. A tel point que les auteurs de l\u2019e\u0301tude les appellent des \u201ce\u0301toiles zombies\u201d. Mais, revers de la me\u0301daille, plus les e\u0301toiles sont grosses et plus leur dure\u0301e de vie est courte. Ainsi, ces e\u0301toiles bru\u0302leront tre\u0300s rapidement (en quelques dizaines de millions d\u2019anne\u0301es quand me\u0302me) leurs nouvelles re\u0301serves avant d\u2019exploser sous forme de supernovas.<\/p>\n

Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. C\u2019est un quartier dense\u0301ment peuple\u0301 et anime\u0301 d\u2019objets qui se de\u0301placent a\u0300 des milliers de kilome\u0300tres par seconde, pour certains. La re\u0301gion autour du trou noir central de la galaxie, Sagittarius A* (Sgr A*), est peuple\u0301 de plus d\u2019un million d\u2019e\u0301toiles entraine\u0301es dans une ronde effre\u0301ne\u0301e par le champ […]<\/p>\n","protected":false},"author":82,"featured_media":12870,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-12871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"\nDes \u00e9toiles zombies, situ\u00e9es pr\u00e8s du trou noir central de notre galaxie, semblent rajeunir - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"C\u2019est un quartier dense\u0301ment peuple\u0301 et anime\u0301 d\u2019objets qui se de\u0301placent 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