Youth and vampirism: Cruelty lagging

Prolonged young blue stragglers stars due to their habits of vampire.
Not all stars are developing normally, some of them seemed to move on its own curve of evolution, behind the development of normal, and her sisters are unusually bright and active much longer than them - this is t. n. Blue stragglers stars.

The reasons for this, experts argue from the opening of these stars in the 1950s. According to one hypothesis, the reason for this prolonged youth - the presence of an external source of hydrogen, ... On the other hand, it is unclear how this could take hydrogen - can it be assumed that each blue star once absorbed and ... It seems now to this question can be answered quite clearly.

A study group of Aaron Geller (Aaron Geller) at the Observatory WIYN, seized a total of 21 stars from the class of blue stragglers that are among the three thousand. stars open cluster NGC 188 in the constellation Cepheus. This cluster - one of the oldest in our galaxy, the age is estimated at seven billion years. These observations, scientists have compared the predictions made ​​on the basis of various hypotheses of origin of blue stragglers stars, and ultimately better than the others agreed with the option of vampire sucking the life out of a nearby star. According to the authors, the problem can be regarded as solved.

Indeed, the observation showed that the vast majority of blue stragglers stars, which were investigated there as part of binary systems and have a companion. The light from their pairs, however, can not register, so that the presence of the companion star can be established only by a light blue star fluctuations caused by the attraction of neighbor. As a rule, they make a complete turn around each other for 1,000 days, and belong to a class of compact and burnt-out white dwarf mass of about half the solar. This led scientists to the conclusion that ...

At the same time, the authors note that these conclusions are not true for all of the 21 th of blue stragglers studied star cluster NCG 188, and others could emerge in other ways. For example, a neighbor of the other two stars on the parameters closer to the version with the ' absorption and digestion, ... What causes an abnormally long their youth - say you still can not.

By the way, ... Read about it: ...