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Acard v733 Driver
Virgo also holds the variable star of this season, W Virginis. W Vir is an exciting yellow giant star that pulsates with a period of about 17 days and is the prototype of a class of stars known as the Population II Cepheids, also known as Acard v733 W Vir variables. W Vir is the prototype of the Type II Cepheids, a separate Acard v733 of stars, which were the cause of some trouble at the turn Acard v733 the century.
In the process of determining the extragalactic distance scale, the Population II Cepheids were mistakenly grouped with the Population I Cepheids and an inaccurate period-luminosity function Acard v733 determined that weakened the distance scale.
Acard v733 now know that these are two different types of stars and that the magnitude differences threw off the distance calibration significantly. W Vir is an exciting springtime observing target and as a Population II star, is one of the oldest stars in the Milky Way. These old stars are important to study because they hold clues to stellar and galactic evolution. Evidently his math skills excelled because when he later attended the Gymnasium of his native town he was able to give assistance to the pupils of the highest classes in mathematics.
On the advice of his Uncle, Eduard studied architecture Acard v733 around when his former love for astronomy was revived at the University Acard v733 Marburg by the lectures he heard given by Christian Gerling. Click image to enlarge.
Argelander received the proposition warmly and Shonfeld matriculated at the University in ; by he had become Argelander's esteemed assistant. For minute exactness and exhaustive comprehensiveness of research, it Acard v733 be difficult to find his superior. Punctilious accuracy and completeness are the unfailing characteristics of his works.
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He discovered numerous variable stars, including W Virginis inas well as contributed much to the physics behind the variations. His research on variable stars are published in two catalogues in the Jahresberichte of the Mannheim Physical Society, Nos. He supervised both observations and revisions and is praised for the attempt and completion of this great project in its finest detail. The argument was about the scale of our Universe: In contrast, Curtis placed our Sun near Acard v733 center of our relatively small Galaxy.
Although the fine points of the debate were more numerous and more complicated, each scientist disagreed Acard v733 the other on these crucial points NASA web page.
Harlow Shapley argued that the "spiral nebulae" were nereby gas clouds, and that the Universe was composed of only one big Galaxy. Shapley's interest at this time was with globular clusters. He studied the period-luminosity relationship Acard v733 the "long-period" variables in the globular clusters and found that the slope was very similar to Acard v733 for those already discovered in the Small Magellenic Cloud, accordingly he incorporated these Acard v733 in his period-luminosity relation as "Cepheids" for a review of the Cepheid period-luminosity relationship as a distance indicator please see the VSOTM article on Delta Cep.
What he did not realize, however, was that these "long-period" cepheids found in the globular clusters were actually Type II Cepheids, a totally different population of star than Leavitt's Type I Cepheids used in earlier calibrations.
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While their light and period-luminosity curves are similar, population II Cepheids are approximately 1. Webb wrote, "Shapley knew that his distance ladder was a rickety structure, and it was built on the quicksand of his Cepheid period-luminosity relation. In the process he also moved the Sun from a previously assumed position near the center, to an outlying location in the disc. Shapley's model remains, in all its essential features, the same Acard v733 we use today Allen Edwin Hubble used the Hooker telesecope at Mt.
Wilson to demonstrate the "spiral Acard v733 were in fact distant galaxies.
Edwin Hubble is justifiably famous for his discovery that the spiral nebulae are galaxies in their own right. Acard v733 the mid 's, and using the inch Hooker Telescope Acard v733 Mount Wilson, then the largest Acard v733 in the world, astronomer Edwin Hubble identified Cepheid variable stars in the Andromeda Galaxy M These stars allowed Hubble to show that the distance to M31 was greater than even Shapley's proposed extent of our Milky Way galaxy.
Therefore M31 was a galaxy much like our own.
In the s, the further discovery of interstellar absorption combined with an increased understanding of the distances and distribution of globular clusters ultimately led to the acceptance that the size of Acard v733 Milky Way Galaxy had indeed been seriously underestimated and that the Sun was not close to the center. Walter Baade discovered that galaxy's were made up of two types of stars: Population I and Population II.
It was Walter Baade who figured out that by grouping the Population Acard v733 and Population II Cepheids together to determine the period-luminosity relation, the calibration would be wrong.
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He realized that Acard v733 galaxy is made up of two types of stellar populations. He was able to take advantage of almost unlimited telescope time and excellent seeing conditions due to wartime blackouts. Baade found that if he used red-sensitive photographic plates it was possible, for the first time, to resolve stars in these companion galaxies and in the central region Acard v733 M31 itself.