Main sequence stars have a Morgan-Keenan luminosity class labelled V. It is here that stars spend about 90 of their lives burning hydrogen into helium in their cores. The classification of stars, the scheme of determining the type of stars according to the temperature. The main sequence stretching from the upper left (hot, luminous stars) to the bottom right (cool, faint stars) dominates the HR diagram. Main sequence stars with a spectral type of O are the coolest stars in the universe they have a surface temperature of only 3,500 Kelvin. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE". We can find O type star sequence in the halo of Milky Way. You can find a full list of credits here. The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. The age, distribution, and composition of the stars in a galaxy trace the history, dynamics, and evolution of that galaxy. The OAE Multilingual Glossary is a project of the IAU Office ofĪstronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Exoplanets Stars Stars are the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies. This term and its definition have been approved by a research astronomer and a teacher O-type stars on the main sequence have the highest masses (greater than about 15 solar masses), shortest hydrogen burning lifetime and, as a result, are mostly found in and around star forming regions. Stars near the beginning or end of their lives are not part of this classification. Given that the Universe is only 13. O-type stars are the hottest and bluest of the main spectral classifications. O stars are the least common and M are the most common found in the main sequence of stars. The lifetimes of main sequence stars therefore range from a million years for a 40 solar mass O-type star, to 560 billion years for a 0.2 solar mass M-type star. Compared to other stars, they appear bluish-white to human eyes unless interstellar or atmospheric reddening is important. They have typical (effective) temperatures between around 10,000 kelvin (K) and 30,000 K. Astronomers identify O-type stars by the presence of absorption lines from ionized helium in their spectra. Description: A star with spectral type "O".
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