WHITE, YELLOW AND RED STARS Secchi

The planets do not have their own light, they reflect the sun's rays. Watching the world through a prism, we get the solar spectrum, but with those changes, which causes their atmosphere, some rays are absorbed, and the number of dark lines increases. In this way it is proved that on Mars and Venus, there is an atmosphere like ours. Jupiter found the atmosphere in which water vapor play an important role. In addition, the spectrum of its lines were observed whose value is not yet clear, and which in any case correspond to the elements, not known on earth, similar phenomena were also observed on Saturn. Our moon has no atmosphere, and the traces does not change the solar spectrum. Thus, spectroscopic studies of planets did not prevent a shortage of bright light, but even more surprising results concerning the fixed stars. Until Secchi (Secchi) and Vogel, the latter can be divided into three types: the first belongs to the white or bluish, stars, here is more than half of all the fixed stars: Sirius, Vega in the constellation Lyra, Atair in the constellation of the Eagle, Regulus in the constellation Leo , Rigel in the constellation Orion and the bright stars of Ursa Major (except a) are examples of this group. These stars are in a heated state of fear, under their atmospheric metal vapors have low absorption capacity, and the spectrum they observed only a trace of dark lines. The second group Secchi belong to the yellow star, they are homogeneous with our Sun. Examples include the Capella in the constellation driver, Pollux in the constellation Gemini, Aldebaran in the constellation Taurus and Ursa Major, Procyon in the constellation Canis Minor. The spectrum is characterized by congestion of the Fraunhofer lines, and these stars have a relatively cold atmosphere of the Sun: it is filled with metal vapors. Elements, whose presence was proved on the yellow stars, in general, are similar to elements of the Sun. Group under consideration, too numerous, to her own about one third of all stars. Relatively few in number a third type, which includes the so-called red stars. The spectrum is characterized by many of the Fraunhofer lines, in which the number they are not observed in the spectra of simple bodies, but only in the spectra of chemical compounds. According to whether there are dark lines in the red part of the spectrum, or in blue, red stars Secchi separates into two subgroups, differences in the past, he explains the composition of their atmospheres. The spectrum of red stars indicates that their temperature is relatively low: in the atmosphere of "there are chemical compounds, we can even make some judgments about their composition: at least, Vogel was able to show that the atmosphere of these stars there are hydrocarbons.