Roiurile globulare. Eterne diamante ceresti

Un roi globular este o colectie sferica de stele care orbiteaza in jurul centrului galactic, ca un satelit natural. Roiurile globulare nu au o preferinta pentru planul galactic ci sunt raspandite uniform in exterior, ca un halou inconjurator. Stelele din componenta roiurilor globulare, sunt foarte strans legate intre ele prin gravitatie, densitatea stelara fiind foarte [...]

Un roi globular este o colectie sferica de stele care orbiteaza in jurul centrului galactic, ca un satelit natural.

Roiurile globulare nu au o preferinta pentru planul galactic ci sunt raspandite uniform in exterior, ca un halou inconjurator.

Stelele din componenta roiurilor globulare, sunt foarte strans legate intre ele prin gravitatie, densitatea stelara fiind foarte mare pe unitatea de spatiu si ea crescand de la periferie catre centru. Aceste proprietati  confera roiului forma de glob sau sfera, de unde deriva si numele de “roiuri globulare”.

Aceste roiuri orbiteaza in zona de halo a galaxiei, deci nu in planul galactic.

Pana in prezent se cunosc numai in Galaxia noastra, 159 de roiuri globulare. Numarul lor se estimeaza a fi mai mare insa posibilitatile tehnice de observare de azi sunt limitate. Unele roiuri globulare pot fi ascunse in spatele unor nori de materie absorbanta (praf si gaz din galaxie) si astfel sunt invizibile de pe Pamant.

Formarea roiurilor globulare ramane un fenomen foarte putin inteles la ora actuala. In interiorul roiurilor globulare, cele mai multe stele se afla in aproximativ acelasi stadiu de evolutie, sugerand ca ele au cam aceeasi varsta si s-au format toate in acelasi timp.

Nu se cunosc roiuri globulare in care sa existe activitate de formare stelara. Stelele din r.g. sunt stele batrane iar acestea sunt formatiuni foarte vechi si stabile in timp.

De asemenea, in interiorul roiurilor nu sunt prezente gaze, praf si materie nebulara. Se pare ca acestea au fost consumate la formarea stelelor roiului cu multe milioane de ani in urma.

Roiurile globulare contin sute de mii de stele iar unele mai mari, ajung pana la milioane de stele.

Stelele componente, prezinta metalicitate redusa, predominand populatia de tip II.

Tipul spectral al stelelor din r.g. este asemanator cu cel din bulbul galactic, numai ca sunt concentrate intr-un spatiu foarte redus, densitatea de stele pe unitatea de volum fiind foarte mare si crescand si mai mult spre centrul roiului.

Distanta tipica dintre stelele componente ale unui roi globular, este de aproximativ 1 an-lumina, dar spre centru se poate ajunge si la distante comparabile cu dimensiunea sistemului nostru solar.

Unele roiuri globulare (ex. M15), au centre extrem de masive, care au condus la ipoteza ca in interiorul lor s-ar gasi o gaura neagra sau ar exista aglomerari de stele neutronice ori pitice albe de mare densitate care ar putea explica aceasta imensa masa centrala.

Metalicitatea roiurilor globulare

Roiurile globulare sunt compuse in mod normal din populatii stelare de tip 2 ( II – metal poor), sarace in elemente mai grele, care contin preponderent hidrogen si heliu si foarte putin elemente mai grele, denumite impropriu  “metalice” (carbon, azot, oxigen, neon…etc), spre deosebire de populatiile stelare de tip I (unu) ( metal rich), care sunt mai bogate in elemente “metalice”, cum ar fi Soarele, care contine si unele elemente mai grele in afara de hidrogen si heliu.

Aceste elemente mai grele (C, N,O,Ne…) determina “metalicitatea” stelelor si sunt produse prin nucleosinteza stelara, care apoi sunt expulzate in spatiu prin distrugerea stelelor care le-au produs si “reciclarea” lor in mediul interstelar, unde vor fi utilizate in nasterea urmatoarelor stele mai bogate in elemente metalice si eventual a sistemelor lor planetare (unde va fi cazul si daca acestea se vor forma).

S-a calculat ca stelele din interiorul roiurilor globulare nu pot detine sisteme planetare, deoarece acestea ar fi dinamic instabile, din cauza prea marii apropieri intre stelele vecine.

Roiurile globulare au densitati stelare foarte mari si de aceea au loc interactiuni si coliziuni frecvente intre stelele componente, mai ales spre centrul acestor roiuri. Din cauza acestor interactiuni, s-au observat cateva categorii “exotice” de stele, si anume “blue stragglers” adica “hoinarii albastri”, “pulsarii de milisecunde” sau miliseconds pulsars” si binarele cu masa redusa, emitatoare de raze X.

Un “hoinar albastru” (blue straggler) se formeaza din unirea sau fuzionarea a doua stele, posibil chiar din intalnirea unei singure stele cu un sistem binar. Steaua care rezulta din aceasta contopire, are o temperatura mai mare decat celelalte stele de aceeasi luminozitate din roi si difera ca tip spectral fata de ele.

Spre exemplu in roiul Messier 53 astronomii au observat cu surprindere mai multi astfel de “hoinari albastri”, atribuiti unor de coliziuni stelare in interiorul clusterului.

Cel mai cunoscut roi globular in tara noastra si vizibil prin instrumente mici, este Messier 13 (sau M13) care se proiecteaza pe bolta cereasca in constelatia Hercule. El este situat la o distanta de 25.100 ani lumina iar in partea lui rezolvabila prin telescop, au putut fi numarate peste 40 mii de stele.

Desigur ca sunt si multe alte roiuri vizibile de la noi iar acestea pot fi identificate cu ajutorul atlaselor ceresti.

Roiurile globulare nu sunt specifice doar galaxiei noastre, Calea Lactee, ci ele au fost observate si in alte galaxii. Astfel in galaxia M 31 din constelatia Andromeda, au fost observate peste 70 de roiuri globulare.

Se pare ca numarul total de roiuri globulare al acestei galaxii este chiar mai mare decat cel al galaxiei noastre.

De asemenea, s-au emis ipoteze ca unele roiuri globulare au fost captate prin acretie de la alte galaxii.

 

Roiurile globulare nu pot fi rezolvate complet in stele. Numarul total de stele dintr-un astfel de roi, se determina cu ajutorul observatiilor fotografice si prin aplicarea unor metode de calcul statistic.

Roiurile globulare contin si stele variabile. Peste 90% dintre stelele variabile ale unui r.g. sunt de tipul RR-Lyrae, iar restul sunt stele diferite, din care mare parte o formeaza cefeidele.

Cu ajutorul stelelor RR-Lyrae, se pot determina distantele pana la roiurile globulare.

Astfel s-a determinat distanta la roiul M13 din Hercule. Roiul din constelatia Canes Venatici se gaseste la o distanta de 13000 parseci iar roiul Omega Centauri, cel mai mare si spectaculos din emisfera sudica (invizibil din Romania) se gaseste la o distanta de 4850 parseci (adica12800 ani lumina) de Pamant.

Privite prin telescop, pe un cer negru si fara poluare luminoasa, roiurile globulare ofera un spectacol celest minunat si imagini foarte frumoase care raman mult timp in amintirea observatorului.

 

Autor articol :  Irimia Teodorian  (Teo)                                                 22 iunie 2016

 

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Multumim Teo pentru articolul interesant si instructiv,astept si eu cu placere sa citesc alte articole scrise de tine.

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Adauga comentariUn roi globular est une collection sphérique d’étoiles qui orbitent autour du centre galactique, tel un satellite naturel.

Les roi globulaires n’ont pas de préférence pour le plan galactique, mais sont répartis uniformément à l’extérieur, comme un halo entourant la galaxie.

Les étoiles constituant les roi globulaires sont très étroitement liées les unes aux autres par la gravité, avec une densité stellaire élevée par unité de volume, augmentant du centre vers la périphérie. Ces propriétés confèrent au roi une forme globulaire ou sphérique, d’où leur nom de “roi globulaire”.

Ces roi orbitent dans la région du halo de la galaxie, donc pas dans le plan galactique.

Jusqu’à présent, on connaît 159 roi globulaires dans notre Galaxie. Leur nombre est estimé être plus élevé, mais les possibilités d’observation actuelles sont limitées. Certains roi globulaires peuvent être cachés derrière des nuages de matière absorbante (poussière et gaz de la galaxie) et sont donc invisibles depuis la Terre. https://cincinnatiseo.org/

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The existence of eternal celestial diamonds in globular clusters not only adds an element of cosmic beauty and intrigue but also challenges our notions of how rare and precious gems can be created in the vastness of space. As astronomers delve deeper into the study of these celestial diamonds, they continue to unravel the intricate connections between the cosmos and the formation of precious materials. u

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The stars in globular clusters are tightly bound together by gravity, with a very high stellar density per unit of space, increasing from the periphery to the center. These properties give the cluster a globe or sphere-like shape, hence the name ‘globular clusters’.

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Este interesant de menționat că roiurile globulare sunt formate din miliarde de stele, care sunt foarte strâns legate între ele. Acest lucru le face să fie foarte stabile și să nu se disperseze în spațiu. Invit pe toți cei interesați de recreere activă
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Peisajul cosmic este bogat și divers, iar roiurile globulare sunt doar unul dintre multele obiecte interesante pe care le putem explora în univers.

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One notable characteristic of globular clusters for https://www.bridgeportdrywallpros.com is their lack of gases, dust, and nebular matter.

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Informațiile pe care le-ați furnizat despre roiurile globulare sunt corecte și cuprind multe aspecte interesante despre aceste formațiuni stelare fascinante. Roiurile globulare reprezintă cu adevărat un subiect intrigant în astronomie, iar cercetarea lor continuă să dezvăluie mai multe detalii despre natura și evoluția acestor sisteme stelare dense.

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Un roi globular este o colecție sferică de stele care orbitează în jurul centrului galactic ca un satelit natural. Aceste roiuri nu se află în planul galactic, ci sunt distribuite uniform în exteriorul acestuia, într-un fel de halou sau coajă sferică în jurul centrului galactic.

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Fascinating insights into globular clusters! The stellar density, lack of star formation, and potential exotic stars within these formations make them captivating. Exploring Messier 13 must be a breathtaking experience. The astronomical wonders never cease to amaze. 🌌 #Astronomy #Stargazing #ConcreteInstallationJourney

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Mulțumesc pentru partajarea informațiilor despre roiurile globulare. Este o prezentare detaliată și interesantă a acestor formațiuni stelare fascinante.

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A globular cluster is a spherical collection of stars that we found on some Bible references that orbit around the galactic center, like a natural satellite.

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Fazele Lunii


Semiluna in crestere
Semiluna in crestere

Vechime Luna: 3 zile

Distanta: 59 raze terestre
Latitudine ecliptica: 3°
Longitudine ecliptica: 73°

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