question 2 from chapter 11. Using the figures 11-4 and 11-7, determine the spect
ID: 293648 • Letter: Q
Question
question 2 from chapter 11.
Using the figures 11-4 and 11-7, determine the spectral types, luminosities, colors and surface temperatures of the forming sun when passing through the protostar, T Tauri, and YSO stages.
M42 (Orion Nebula). Spectral type Protostars glow in the infrared 10% A contracting protostar grows hotter but is hidden inside its dusty cocoon and is detectable only in the intrared e 10 Infrared 10-2 A newborn star becomes visible as ia blows its dust cocoon away A protostar begins as an nvisible concentration of gas deep inside a cloud 30,000 20,000 .0 3000 2000 1000 500 300 200 100 Temperature (K) Figure 11-4 (a) This H-R diagram has been extended to very low temperatures to show sche the contraction of a dim, cool protostar. (b) Protostars are normally because invisible at visual wavelengths they are cool objects and are deep inside dusty clouds of gas, but they are detectable at infra- red wavelengths.Explanation / Answer
Answer:
Protostar is the earliest stage of stellar evolution. When passing through this stage, the forming sun has luminosity range of 10-5 to 10-3 L/L, dark colour (though the protostars glow in the infrared region) and surface temperature around 100 K. So, at the protostar stage, the temperature is very low. At this stage, there is no designated spectral type. The next stage is young stellar object (yso) stage. It also has no designated spectral type. As of the diagram, the forming sun passing through this stage has luminosity range of 10-3 to 103 L/L, colour ranging from dark to infra-red and surface temperature ranging from little more than 100 K to little more than 1000 K. The final stage before the formation of main-sequence stage is T tauri stage. While passing through this stage, the forming sun has the spectral type ranging from M to F, luminosity range of 103 to 1 L/L, colour range different in different spectral types of M (almost red to darker red), K (orange to red), G (light yellow to slight yellowish orange) and F (light yellow) and surface teperature ranging from a little more than 1000 K to 6000 K.
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