Video: Qhov B ntau npaum li cas hauv BV sawv cev rau dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
(B-V ) xim rau hauv kub: liab txhais tau tias txias, xiav txhais tau tias kub. V magnitude rau hauv luminosity: me me txhais tau tias muaj zog, loj txhais tau tias tsis muaj zog.
Ib yam li ntawd, koj tuaj yeem nug, BV yog dab tsi hauv astronomy?
Cov `` B-V xim index'' yog ib txoj hauv kev los ntsuas qhov no siv ob lub lim dej sib txawv; ib lub xiav (B) lim uas tsuas yog cia ib tug nqaim ntau yam xim los yog wavelengths los ntawm nruab nrab ntawm cov xim xiav, thiab ib tug "visual" (V) lim uas tsuas cia lub wavelengths ze rau lub ntsuab-daj band los ntawm.
Ib sab saum toj no, koj yuav pom qhov loj npaum li cas bolometric? Cov bolometric loj feem ntau yog xam los ntawm qhov muag pom qhov loj plus ib bolometric kho , Mua bol = MV + BC. Qhov no kho xav tau vim cov hnub qub kub heev radiate feem ntau ultraviolet hluav taws xob, whereas lub hnub qub txias heev radiate feem ntau infrared tawg (saib Planck txoj cai).
Ib yam li ntawd, koj tuaj yeem nug, dab tsi yog cov axes ntawm HR daim duab?
Cov no daim duab , hu ua Hertzsprung-Russell los yog HR daim duab , zaj duab xis luminosity nyob rau hauv solar units ntawm Y axis thiab stellar kub ntawm X axis , raws li qhia hauv qab no. Nco ntsoov tias cov nplai tsis yog linear. Cov hnub qub kub nyob rau sab laug tes ntawm lub daim duab , txias hnub qub sab xis.
Dab tsi yog stellar xim?
Hnub qub xim. Ib tug quantitative txhais tau tias kev ntsuas hnub qub Cov xim muaj xws li kev sib piv ntawm daj (pom) qhov loj ntawm lub hnub qub nrog nws qhov loj me ntsuas los ntawm lub lim xiav. Kub, xiav hnub qub tshwm ci dua los ntawm lub lim dej xiav, thaum qhov kev tawm tsam yog qhov tseeb rau cov hnub qub txias, liab.
Pom zoo:
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