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Alexey Mints
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PhD exam
1.
Âçàèìîäåéñòâèå çâåçä ôîíà
ñî çâåçäíûìè ñêîïëåíèÿìè Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö Ñàíêò-Ïåòåðáóðãñêèé ãîñóäàðñòâåííûé óíèâåðñèòåò 22 àïðåëÿ 2008 ã. Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 1/ 10
2.
2. Çàäà÷è ðàáîòû
Äèíàìèêà çàäà÷à ðàññåÿíèÿ îäèíî÷íûõ è äâîéíûõ ÷àñòèö íà ñêîïëåíèÿõ ñ ðàçíûìè N; îïðåäåëåíèå âåðîÿòíîñòè çàõâàòà ÷àñòèö â ñêîïëåíèå; îöåíêà âëèÿíèÿ êðàòíûõ âçàèìîäåéñòâèé íà ïðîöåññ çàõâàòà. Ñòàòèñòèêà çâåçäíûõ ñêîïëåíèé îöåíêà ïîëíîãî êîëè÷åñòâà çàõâàòîâ çà õàðàêòåðíîå âðåìÿ æèçíè ñêîïëåíèÿ; Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 2/ 10
3.
3. ×èñëî çâåçä,
ïðîëåòàþùèõ ÷åðåç ñêîïëåíèå X √ n(v < X) dt = ˜ nbg f (v)v∆t4πR2 dv = 2 2πnbg σbg R2 α(X) dt, 0 äëÿ íåïîäâèæíîãî ñêîïëåíèÿ 2 2 2 1.8 Ψ(X,X0) Ξ(X) ˜ f (v) = √ 2 3 v 2 e−v /2σbg . 2πσbg 1.6 1.4 α(X) = Ξ(X) äëÿ Ψ(X, X0); Ξ(X) 1.2 1 íåïîäâèæíîãî ñêîïëåíèÿ. 0.8 0.6 α(X) = Ψ(X, X0 ) äëÿ 0.4 0.2 äâèæóùåãîñÿ ñêîïëåíèÿ. 0 0.5 1 1.5 2 2.5 3 3.5 4 x Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 3/ 10
4.
4. Àíàëèòè÷åñêèé ïîäõîä
Äëÿ ìåäëåííûõ çâåçä (v0 σcl ) èçìåíåíèå ñêîðîñòè îïèñûâàåòñÿ áîëüøèì ÷èñëîì ñëàáûõ âçàèìîäåéñòâèé. Äëÿ áûñòðûõ çâåçä (v0 σcl ) èçìåíåíèå ñêîðîñòè îïðåäåëÿåòñÿ îäíèì ñèëüíûì âçàèìîäåéñòâèåì. 1 0.1 0.01 pcapture(v0) 0.001 1e-04 1e-05 v0 σcl v0 σcl 1e-06 0.1 1 v0 Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 4/ 10
5.
5. Îäèíî÷íûå çâåçäû
N=500; mbg=0 N=500; mbg=mcl 1 1 0.1 0.1 0.01 0.01 pcapture pcapture 0.001 0.001 1e-04 1e-04 1 1 2 2 1e-05 1e-05 3 3 4 4 1e-06 1e-06 0.1 1 0.1 1 v0 v0 1. ÷èñëåííîå ìîäåëèðîâàíèå (çàäà÷à N òåë); 2. ÷èñëåííîå ìîäåëèðîâàíèå (ìåòîä Ìîíòå-Êàðëî); 3. àíàëèòè÷åñêîå ïðèáëèæåíèå (ìåäëåííûå çâåçäû); 4. àíàëèòè÷åñêîå ïðèáëèæåíèå (áûñòðûå çâåçäû). Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 5/ 10
6.
6. Êðàòíûå âçàèìîäåéñòâèÿ
1 1 2 0.1 3 4 0.01 P 0.001 1e-04 1e-05 0.1 1 v0 1. êðàòíûå âçàèìîäåéñòâèÿ. 2. ÷èñëåííîå ìîäåëèðîâàíèå (çàäà÷à N òåë), îäèíî÷íûå çâåçäû; 3. ÷èñëåííîå ìîäåëèðîâàíèå (ìåòîä Ìîíòå-Êàðëî); 4. ÷èñëåííîå ìîäåëèðîâàíèå (çàäà÷à N òåë), äâîéíûå çâåçäû. Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 6/ 10
7.
7. Ïîëíîå ÷èñëî
çàõâàòîâ Äëÿ îöåíêè ïîëíîãî ÷èñëà çàõâà÷åííûõ çâåçä íåîáõîäèìî âû÷èñëèòü èíòåãðàë: ∞ C= f (v0 )Pcapture (v0 ) dv0 , 0 ãäå Pcapture (v0 ) âåðîÿòíîñòü çàõâàòà, à f (v0 ) çàäàåòñÿ ôîðìóëîé: 3 1 −v0 /2σbg 2 2 f (v0 ) dv0 = v0 4 e dv0 2σbg v0 - ñêîðîñòü çâåçäû ôîíà íà áåñêîíå÷íîñòè, σbg - ñðåäíåêâàäðàòè÷íàÿ ñêîðîñòü çâåçä ôîíà. Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 7/ 10
8.
8. ×èñëî çàõâàòîâ
0.1 1 2 3 0.01 P(v0)v03 0.001 1e-04 0.1 1 v0 1. àíàëèòè÷åñêîå ïðèáëèæåíèå (ìåäëåííûå çâåçäû); 2. ÷èñëåííîå ìîäåëèðîâàíèå (ìåòîä Ìîíòå-Êàðëî); 3. ÷èñëåííîå ìîäåëèðîâàíèå (çàäà÷à N òåë). Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 8/ 10
9.
9. ×èñëî çàõâàòîâ
√ 4 σcl ×èñëî çàõâàòîâ â åäèíèöó âðåìåíè: N (v0 ) = 256 2πnbg R2 σ3 T . bg T ïðåäñòàâëåíî â òàáëèöå. N mbg Àíàëèòè- Ìåòîä Ïðÿìîå ÷åñêèå îöåíêè Ìîíòå-Êàðëî èíòåãðèðîâàíèå çàäà÷è N òåë −3 −3 −3 200 0 0.11 × 10 0.55 × 10 0.44 × 10 200 mcl 0.14 × 10−3 0.81 × 10−3 1.05 × 10−3 500 0 0.05 × 10−3 0.30 × 10−3 0.16 × 10−3 500 mcl 0.06 × 10−3 0.39 × 10−3 0.39 × 10−3 2000 0 0.01 × 10−3 0.11 × 10−3 0.03 × 10−3 2000 mcl 0.02 × 10−3 0.13 × 10−3 0.13 × 10−3 Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 9/ 10
10.
10. Ðåçóëüòàòû, âûíîñèìûå
íà çàùèòó Àíàëèòè÷åñêèå îöåíêè âåðîÿòíîñòè çàõâàòà îäèíî÷íûõ çâåçä ôîíà ñî ñêîïëåíèÿìè â äâóõ ïðåäåëüíûõ ðåæèìàõ âçàèìîäåéñòâèÿ: 1) äèôôóçèÿ â ïðîñòðàíñòâå ñêîðîñòåé (äëÿ ìåäëåííûõ çâåçä); 2) çàõâàò ïðè îäíîêðàòíîì ñèëüíîì âçàèìîäåéñòâèè (äëÿ áûñòðûõ çâåçä). ×èñëåííûå îöåíêè âåðîÿòíîñòè çàõâàòà ïðè âçàèìîäåéñòâèè îäèíî÷íûõ è äâîéíûõ çâåçä ôîíà ñî ñêîïëåíèÿìè â çàâèñèìîñòè îò íà÷àëüíîé ñêîðîñòè çâåçäû ïîëÿ, êîëè÷åñòâà çâåçä â ñêîïëåíèè è íà÷àëüíîé áîëüøîé ïîëóîñè (â ñëó÷àå äâîéíîé). Âåðîÿòíîñòè ðàçëè÷íûõ èñõîäîâ (èîíèçàöèÿ, äâóõêðàòíàÿ èîíèçàöèÿ, îáìåí, çàõâàò) ïðè ñáëèæåíèè äâîéíîé ñ îäèíî÷íîé èëè äâîéíîé çâåçäîé. Îöåíêà âêëàäà êðàòíûõ ñáëèæåíèé â îáùóþ âåðîÿòíîñòü çàõâàòà â ñêîïëåíèå. Îöåíêà îáùåãî êîëè÷åñòâà çâåçä ïîëÿ, êîòîðûå ìîãóò áûòü çàõâà÷åíû çà âðåìÿ æèçíè ñêîïëåíèÿ: îò 10−3 äëÿ ìàëîìàññèâíûõ ñêîïëåíèé â îêðåñòíîñòè Ñîëíöà äî 100 äëÿ ìàññèâíûõ ñêîïëåíèé. Ýòî ÷èñëî íåäîñòàòî÷íî äëÿ âëèÿíèÿ íà èíòåãðàëüíûé öâåò ñêîïëåíèÿ, íî ìîæåò ÷àñòè÷íî îáúÿñíèòü íàëè÷èå â ñêîïëåíèÿõ ãîëóáûõ áðîäÿã è çâåçä ñ ïåêóëÿðíûì õèìè÷åñêèì ñîñòàâîì. Àëåêñåé Àëåêñàíäðîâè÷ Ìèíö 10/ 10
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