TASNIFI SPEKTRII SITORAHO

TASNIFI SPEKTRII SITORAHO, vobasta ba farqi spektrho ba sinfho judo kardani sitorahoro guyand. Alhol taqsimoti spektrii Harvard qabul shudaast, ki onro astronomi amerikoi E. Kennon dar ibtidoi asri 20 pesh nihodaast.
Meyori asosii in tasnif intensiviyati khathoi spektrii atomi yo rakhhoi molekulavi meooshad; taqsimoti energiya boshad, dar spektri yaklukhti sitoraho taqribist. Tasnifi spektrii sitoraho, ki ba malumoti tajribavi asos yoftaast, tasnifi harorati meboshad va yak daraja tafovuti tarkibi khimiyavii sitorahoro ifoda mekunad.

Sinfhoi opektri bo harfho ishorat meshavand va az rui pastshavii harorat joygirand: Guzarishhoi baini K — N sinfho befosila buda, qismhoi dahi, masalan, VO, V I, …, V9, AO, … dar dokhili sinfho meboshand. Ilova bar in, har yak sinfi pasoyanda yo qismi on nisbat ba peshoyandaash sinfi derin hisob meshavad. 99 foizi hamai sitoraho ba sinfhoi V — M mansuband. Sitorahoy sinfhoi O, K, N, S nodirand. Sinfhoi spektri bo alomathoi zerin az ham farq mekunand.
Sinfi O (harorat 1 = 50000— —30000 K). Ba in sinf sitorahoi safedi khele tafsone mansuband, ki dar onho sohai ultrabunafshi spektr khele inkishof yoftaast. Khathoi gelii ionizonida purzurand. Inchunin khathoi chandkarata ionizonidai nitrogen, karbon, oksigen va silisiy: N111, S111, O111, SiIV mushohida meshavand.
Sinfi V (1 30000—12000 K). Ba spektrhoi sitorahoi kabudi yak sinf khathoi geliyi neytrali va oksigenu nitrogeni ionizasiyashuda khosand. Khathoi gidrogen az VO to sinfi V 9 purzur meshavand. Khathon kalsiyi ionizasonida va magniyro niz mushohida kardan mumkin ast.
Sinfi A (I 11500—7700 K). Sitorahoi safedero dar bar megirad, ki dar spektrashon khathoi gidrogen (seriyai Balmer) beshtarand. Khathoi geliy nest shuda, khathoi ohani neytrali mushohida meshavand.
Sinfi B (t 7600—6100 K). Ba in sinf sitorahoi zardu safede mansuband, ki dar spektrashon khathoi gidrogen hanuz intensivnok buda, khathoi ziyodi metallho niz mushohida meshavand.
Sinfi G (t 6000—5000 K). Dar spektrhoi on khathoi gidrogen dar bayni khathoi purzuri metallho digar malum nameshavand. Oftob niz mansubi hamin sinf ast. Khathoi N va K-k kalsiy itetensivnokand.
Sinfi K (t= 4900—3700 K). Sitorahoi norinjie mansuband, ki dar spektrashon khathoi N va K-i kalsiy, khathoi furuburdi molekulahoi oksidi titanro pay burdan mumkin.
Sinfi M (t 3600—2600 K). Ba in sinf sitorahoi surkhe mansuband, ki spektrashon rakhdor ast. Khathoi N va M-i kalsiy khele sust buda, tasmahoi oksidi titan purzurand.
Sinfi R (t 5000 — 4000 K). Spektri sitorahoi in sinf ba spektrhoi sinfhoi SS — K 5 monand ast, lekin rakhhoi furuburdi molekulahoi S2 khele purzur meboshand.
Sinfi N (t 3000—2000 K). Sitorahoi surkhand, ki dar spektrashon purzurshavii rakhhoi S2 va SN mushohida meshavand.
Sinfi S (t 3000—2000 K). Az rui taqsimoti energiya dar spektri yaklukht ba sitorahoi sinfhoi spektrii M va N monandand, vale dar spektri onho rakhhoi elementhoi nodiri Zamin — oksidi sirkoni, oksidi ittriy va oksidi lantan mushohida meshavadd. Q. Saidov.