VbvAstR-001

10.4 Ñðàâíåíèå âû÷èñëåííûõ çíà÷åíèé
ñêîðîñòè âðàùåíèÿ ïåðèàñòðîâ ñ
äàííûìè íàáëþäåíèé
Ïîñêîëüêó ðàâíîâåñíàÿ ïëîòíîñòü âåùåñòâà âíóòðè ÿäðà (Eq.(10.23)) ïðèìåðíî
ïðîïîðöèîíàëüíà êâàäðàòó çàðÿäà àòîìíûõ ÿäåð, âðàùåíèå ïåðèàñòðîíîâ çâ¼çä,
ïëàçìà êîòîðûõ ñîñòîèò èç ÿäåð ñ âûñîêèìè Z, áóäåò î÷åíü ìåäëåííûì.
Ïîýòîìó, â ñîîòâåòñòâèè ñ ðàâåíñòâîì (10.24), âîçìîæíî èçìåðèòü àïñèäàëüíîå
äâèæåíèå òîëüêî òåõ çâ¼çä, êîòîðûå ñîñòîÿò èç ëåãêèõ àòîìíûõ ÿäåð.
Âåëè÷èíà ξ = Z/[AZ 3 ] â (10.24) ðàâíà 1/8 äëÿ âîäîðîäà, 0.0625 äëÿ äåéòåðèÿ,
1.85 · 10 −2 äëÿ ãåëèÿ. Ñëåäóåò çàìåòèòü, ÷òî ñóììàðíàÿ âåëè÷èíà âðàùåíèÿ
àïñèä
∑
ñîçäàåòñÿ âêëàäàìè îáåèõ çâ¼çä. Âîçìîæíûå êîìáèíàöèè ïàð è âåëè÷èíû
2
1
ξi äëÿ äâîéíûõ çâ¼çä, ñîñòîÿùèõ èç ëåãêèõ ýëåìåíòîâ, ïðåäñòàâëåíû â
òàáëèöå (10.4).
star1 star2 ξ 1 + ξ 2
composed of composed of
H H .25
H D 0.1875
H He 0.143
H hn 0.125
D D 0.125
D He 0.0815
D hn 0.0625
He He 0.037
He hn 0.0185
Çäåñü îáîçíà÷åíèå "hn"óêàçûâàåò, ÷òî çâåçäà ñîñòîèò èç òÿæåëûõ ÿäåð.
Ïåðèîäû àïñèäàëüíîãî âðàùåíèÿ èçìåðåíû äëÿ íåñêîëüêèõ äåñÿòêîâ òåñíûõ
çâ¼çäíûõ ïàð [11]. ×òîáû ñðàâíèòü ðåçóëüòàòû ïðèâåäåííûõ âûøå âû÷èñëåíèé ñ
äàííûìè èçìåðåíèé, íà ðèñ.10.1 ïîêàçàíî ðàñïðåäåëåíèå òåñíûõ çâ¼çäíûõ ïàð
ïî
∑
ïàðàìåòðó (P/U)(P/T ) 2 . Ëèíèè íà ýòîì ðèñóíêå ñîîòâåòñòâóþò ïàðàìåòðó
2
1
ξi äëÿ ðàçíûõ òèïîâ ïàð â ñîîòâåòñòâèè ñ ðàâåíñòâîì 10.27. Íåòðóäíî
âèäåòü, ÷òî âû÷èñëåííûå âåëè÷èíû äâèæåíèÿ ïåðèàñòðîíîâ óäîâëåòâîðèòåëüíî
ñîãëàñóþòñÿ ñ äàííûìè èçìåðåíèé.
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