According to the Morgan-Keenan (MK) system, which spectral class represents the hottest main sequence stars?
Answer
O
O-type stars occupy the very top rung of the Morgan-Keenan (MK) spectral classification system, which arranges classes from hottest to coolest as O, B, A, F, G, K, and M.
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According to the Morgan-Keenan (MK) system, which spectral class represents the hottest main sequence stars?What specific spectral feature is the hallmark used to classify an O-type star?How do numerical subdivisions (3 through 9) within the 'O' spectral class relate to temperature?What is the approximate temperature range for O-type stars mentioned in the text?What spectral class does our Sun belong to in the MK system?How massive are O-type stars typically compared to the mass of the Sun?Compared to the Sun's expected lifespan of 10 billion years, how long do O-type stars typically survive on the main sequence?What is the likely end stage for a massive O-type star after exhausting its core fuel?What is the approximate rarity of O-type stars within the Milky Way galaxy?What color are O-type stars perceived as due to their extreme heat, and where does their peak light emission fall?