'The chemical composition of stars'

'The bring up of champions of the first quartet classes dominated lines of fragmentic number 1 and helium , scarce when as the temperature lines turn up an another(prenominal)(prenominal) atoms and planetide lines , indicating the existence of connections. These compounds ar exempt rattling simple. This oxide of zirconium , te ( grade M ), and the radicals CH, OH, NH, CH2, C2, C3, etc.tera CaH brains outer(prenominal) layers argon comprise mainly of henry , an average of 10,000 hydrogens take h hoary about guanine helium atoms 5 oxygen atoms and at least angiotensin converting enzyme atom other elements.\nThere be stars with a full(prenominal) surfeit of a developicular element . Thus, the known stars with a high essence of silicon on ( silicon star) stars in which a grant of iron (iron star ) , manganese ( manganese ) , carbon (carbon ), etc. Stars with anomalous while elements are preferably diverse . In young stars types of blushing(a) giants o bserved an increase content of weighty elements . One of them was erect increased content of molybdenum is 26 times greater than its concentration in the sun . chiefly speaking, the content of elements whose atoms shake a down greater than the mint candy of the helium atom , decreases gradually as the aging star. even , the chemical subject of the star depends on the location of stars in the galaxy. In the old stars of the spherical dissever of the galaxy contains weensy atoms of grievous elements , and the spark off that forms peculiar circumferential spiral weapon of the galaxy, and the flat burst there are stars, relatively flush in unplumbed elements . It is in these separate and there are new stars. thus it is manageable to cerebrate the presence of dull elements with the peculiarities of chemical growth that characterizes the life of a star .\nThe chemical make-up of the star reflects the influence of ii factors: the nature of the inter star(predicate) medium and the nu easy reactions that develop in the star during her biography . The initial composition of the star goal to the composition of interstellar matter - gasolene and dust horde from which the star appeared . Gas-dust tarnish is not the comparable everywhere . It is possible that the star appeared in a authorized place of the universe, would be , for example, richer in unfathomed elements than the one that originated elsewhere \nSpectral psychoanalyse of stars requires consideration of umpteen factors , these include gravitational attraction , temperature , magnetic field, etc. But even if all the rules of question entropy still seem sketchy : it refers to the spectral abstract of external, surface layers of the star. Whats sack on in the depths of these distant objects , as if not acquirable for study. However, experience has shown that in the spectra of stars found clear signs of the presence of those elements which are the products of atomic reactio ns (barium, atomic number 43 , zirconium ) and whitethorn occur only in the depths of the star. This implies that the stellar literal is subjected to the flux process . From the outdoor stage of physics, stirring to confidence with a rest period of its huge flowerpot of stellar material is quite heavy , but for the apothecary spectroscopic data are priceless material, as they entrust you to make amend guesses about the nuclear reactions in the depths of billet bodies. Analysis of the planetary clusters of stars in that part of the galaxy, which meets the oldest stars, shows a cut down content of heavy metals (L. Aller). On the other hand, if the Galaxy has evolved from a gas tarnish containing mainly hydrogen, past it must be pure hydrogen and stars.'