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 ionised helium, strong lines of other ionised elements, and hydrogen and neutral helium … See more 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 … 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 … 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 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 See more WebLifeSTAR Oregon is a phased treatment program aimed at helping individuals who struggle with pornography addiction and unwanted compulsive sexual behaviors. The phases of …
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