shrink napisal/-a: ↑14.2.2017 20:00
Pa koga bi ti rad farbal, neizobraženi trol? "Izgorevanje vodika" v zvezdah je strokovno napačen pojem, "uradni tekst", ki ga citiraš, pa ni merodajen, saj gre za študentski seminar. Edini merodajni teksti so učbeniki ali skripte in npr. v skripti prof. Čadeža
"Fizika zvezd" ni nikakršnega "zgorevanja" ali "izgorevanja", ampak:
Tu so zvezde katerih primarni izvor energije je jedrska fuzija vodika v jedru zvezde v helij.
Izobraženost trola osfa:
Zero, Zilch, Nada.
https://en.wikipedia.org/wiki/Deuterium_fusion
Deuterium fusion, also called deuterium burning, is a nuclear fusion reaction that occurs in stars and some substellar objects, in which a deuterium nucleus and a proton combine to form a helium-3 nucleus. It occurs as the second stage of the proton–proton chain reaction, in which a deuterium nucleus formed from two protons fuses with another proton, but can also proceed from primordial deuterium.
The Birth of Stars and Planets
John Bally and Bo Reipurth
A young star reaches the main sequence when it starts burning ordinary
hydrogen into helium at a steady rate. To reach this stage may take anywhere
from a few million years for several-solar-mass stars to about 100 million
years for the lowest-mass stars near the brown dwarf limit. This is still very
short compared to the many billions of years that low-mass stars can exist
as stable main-sequence stars.
Between the protostellar and main sequence stages, young stars are known
as pne-main sequence stars. The protostellar stage ends when the stellar embryo
has gained more than half of its final mass. This transition nearly coincides
with the emergence of the first light from the newborn star. When placed in
the HertzsprungRussell diagram, these freshly emerged pre-main sequence
stars define a locus called the birth line.6
The energy produced in the stellar interior diffuses to the stellar surface.
It can do so in two ways: by large-scale convective motions of the gas in huge
eddies, or by radiation. A newborn star starts out fully convective from its
surface to its very center. Convection brings fresh deuterium to the center,
where it burns to helium as soon as contraction raises the central temper
ature to a million degrees. Deuterium burning has the unusual property
that it acts as a thermostat and does not allow the central temperature to
rise above one million degrees. So even though the contraction of the star
would produce higher central temperatures, this is not possible until the
deuterium burning stops. During this stage, called the Hayashi track7 in the
HertzsprungRussell diagram, the star then becomes smaller and smaller
and less and less luminous. Rut at a certain point the energy transport in
the stellar interior begins to switch from convective to radiative. As a result,
there is no longer a steady supply to the interior of fresh deuterium from the
higher layers, and the deuterium burning ceases. Once the deuterium ther-
mostat is switched off. the central temperature begins to rise as the star
continues to contract. The surface temperature of the star also begins to
rise, and even though the star becomes smaller, its total luminosity stays
approximately constant. Eventually the star becomes sufficiently hot in its
interior to start nuclear burning of ordinary hydrogen as the star reaches
the main sequence. Stellar youth is over.
(.)
Shrink, dobro ti gre!
SSKJ:
Izgorévati -am nedov. (ẹ́)
1. približevati se koncu gorenja: luč počasi izgoreva; mladost izgoreva kakor sveča;
pren., ekspr. zadnje moči mu izgorevajo
• ekspr. izgorevati od hrepenenja izčrpavati se, slabeti
2. ekspr., v zvezi z v, za izčrpavati se zaradi velike prizadevnosti, vneme: izgorevati za
domovino, svobodo; izgorevati v delu, skrbi za družino; prim. zgorevati
goréti -ím nedov., gôrel (ẹ́ í)
1.
izginjati, uničevati se v ognju, plamenu in ga s tem vzdrževati: začelo je goreti;
suha drva dobro, hitro gorijo; papir je gorel z močnim plamenom; po hribih gorijo
kresovi; senik je gorel kot bakla; brezoseb. v štedilniku ves dan gori / ogenj v peči
slabo gori / kot klic pri požaru gori
2. s tem izginjanjem, uničevanjem dajati svetlobo: luč je gorela vso noč; ob postelji
so gorele sveče / žarnica ne gori več // ekspr. dajati močen sij, žar: nebo je gorelo v
večerni zarji; pesn. zvezde gorijo / njene oči so kar gorele
3. ekspr. biti razgret od bolezni, napora: otrok je bolan, saj ves gori; glava, čelo mu
gori; telo ji je pričelo goreti / lica so ji gorela od zadrege
4. ekspr. biti, obstajati v veliki meri: v njem je gorela ljubezen, strast; v srcu je gorelo
sovraštvo / še vedno je gorelo upanje v njej; ta želja že dolgo gori v njem // kazati se
v veliki meri: z obraza mu je gorela jeza; v očeh ji gori radost; zaničevanje je gorelo v
njegovih pogledih // v zvezi z od biti zelo čustveno vznemirjen: goreti od hrepenenja,
ljubezni; ves je gorel od jeze, nestrpnosti, razburjenja, sovraštva / gori od želje, da bi
jo videl
5. ekspr., v zvezi z za izražati, kazati veliko prizadevnost, navdušenje: gorel je za
domovino; goreti za resnico, svobodo / ves gori za šport
Argument iz avtoritete
Kdor uporablja argument iz avtoritete, utemeljuje, da je neka trditev resnična, ker tako pravi določena oseba ali skupina, ki ima določeno avtoriteto. Ta argument je pogosto uporabljen s poudarkom na izkušnjah ali izobrazbi določene osebe. Razumljivo je, da je verodostojnost trditev tistih, ki imajo primerne izkušnje in izobrazbo, večja. Prav tako smo sumničavi do trditev nekoga, ki podaja avtoritativne izjave s področja, za katerega ne more pokazati izkušenj. A resničnost trditve mora sloneti na logiki in dokazih in ne na avtoriteti in osebi, ki jo promovira.