I found an article called, “Record-Breaking Faint Satellite of the Milky Way Discovered“. Research from the Tohoku University along with an international team has been extremely very successful on finding faint dwarf’s in the Milky Way. The team discovery is part of the ongoing Subaru Strategic Survey. They are using Hyper Subprime-Cam, to help aid them in the new discovery’s. The satellite named Virgo I is in direction of thr constellation Virgo. There are fifty satellite galaxies of the Milky Way that have been defined. Around forty of them are faint and diffuse and belong to the category of a so-called “dwarf spheroidal galaxies”. With the use of telescopes, the standard method for looking for a characteristic distribution of stars in the color-magnitude diagram. Which is comparable to the Hertzsprung Russell diagram. The stars in a general field show no particular patterns in this diagram. A student named Daisuke Homma, a graduate student at Tohoku University. Found Virgo I with the help and guidance of his advisor Masashi Chiba along with the help of the international collaborators. One of the many motivations for the Subaru Strategic Survey is being able to use HSC to increase observation in the search for new discoveries in the Milky Way galaxies.
The twelfth conceptual objective is, I can explain how astronomers use the Hertzsprung-Russell diagram to study properties of stars. The Hertzsprung-Russell diagram is used by astronomers to identify main sequence stars. Most stars are analyzed on a line called the main sequence. This classification of stars by temperature, mass, and luminosity. There are three types of stars when were classifying the mass, which is hot which has a large radius, Medium which has a medium radius, and small which has a small radius. Some types of stars that are not on the main sequence are giants. And giants are classified as stars that are so bright they go off the scale of the main sequence. The key idea in a main sequence is mass matters. In class we did a lecture tutorial called H-R diagrams. This tutorial taught us about H-R diagrams. It has a graph which is the H-r diagram, on the vertical side it has luminosity and absolute magnitude, and the horizontal it has spectral type and temperature. With these four measurements we can classify stars as white dwarf, main sequence, and red giants. This lecture tutorial also showed us how to properly read a H-R diagram and see the differences among the different type of stars.
This article was very interesting reading about new discoveries in the Milky Way. But also these discoveries are being made by college students. It also related to the conceptual objective and how astronomers classify stars using the Hertzsprung-Russell diagram.