WebHere is an calculator for the lifetime of a star on the main sequence. The following table, repeated from Chapter 18, summarizes some basic properties of main sequence stars for different spectral classes, including their main sequence lifetimes. Main Sequence Spectral Class Properties. Spectral Class. Mass (Solar Units) Luminosity (Solar Units) O-type stars are classified by the relative strength of certain spectral lines. The key lines are the prominent He lines at 454.1 nm and 420.0 nm, which vary from very weak at O9.5 to very strong in O2–O7, and the He lines at 447.1 nm and 402.6 nm, which vary from absent in O2/3 to prominent in O9.5. The O7 … See more An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system employed by astronomers. They have temperatures in excess of 30,000 kelvin (K). Stars of this type have strong absorption lines of … See more O-type stars are rare but luminous, so they are easy to detect and there are a number of naked eye examples. Main-sequence • 9 Sagittarii • 10 Lacertae • AE Aurigae See more O-type stars are hot and luminous. They have characteristic surface temperatures ranging from 30,000 to 52,000 K, emit intense ultraviolet light, and so appear in the visible spectrum as bluish-white. Because of their high temperatures the luminosities of main … See more Spiral arms O-type main-sequence stars tend to appear in the arms of spiral galaxies. This is because, as a spiral arm moves through space, it compresses any molecular clouds in its way. The initial compression of these molecular clouds … See more
What Kind of Stars Live the Longest? Sciencing
WebApr 30, 2024 · The lifetime of the hydrogen-burning phase for a star depends on two factors: how much hydrogen exists and the rate of hydrogen fusion. For massive O-type stars, … WebTypes of Stars. NASA’s Solar Dynamics Observatory captured this image of our 4.6-billion-year-old Sun, a main sequence star. Scientists expect it will remain one for another 5 billion years before becoming a red giant. Credit: NASA's Scientific Visualization Studio/SDO. The universe’s stars range in brightness, size, color, and behavior. spring hill tn city administrator
Stellar Lifetimes - GSU
WebQuestion. thumb_up 100%. For each statement concerning main sequence stars, select T True, F False, G Greater than, L Less than, or E Equal to. A) The surface temperature of a O type star is .... than a K type star. B) On the main sequence, the mass of a O type star is .... than a F type star. C) On the main sequence, a M type star's life is ... WebThe Hertzsprung-Russell diagram is one of the most important tools in the study of stellar evolution.Developed independently in the early 1900s by Ejnar Hertzsprung and Henry Norris Russell, it plots the temperature of stars against their luminosity (the theoretical HR diagram), or the colour of stars (or spectral type) against their absolute magnitude (the … WebAug 1, 2012 · A 30 M ☉ star (mid O-type) forms in only ~10 5 yr, ... feedback, remove the gas on timescales comparable with the lifetime of massive stars. Westerlund 1 is a high-mass star cluster in the Milky Way whose age is only 4–5 Myr, yet its H … sheraton four points chicago