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Quiz 2 - Sara Miller Quiz 2 material
Our Solar System (ESCI 420)
University of New Hampshire
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Quiz 2
- Try using the positions of stars in the M67 cluster on the H-R diagram to estimate the age of the cluster. Refer to the end of the 'Week 2' video to get a sense of what we might expect for older and younger clusters. Go to: astronomy.nmsu/geas/labs/hrdiagram/html5/stellar.html (Links to an external site.) (Links to an external site.) You can ignore the yellow plot at the top left and the aperture arrows.. feature would allow you to refine your data, but this is beyond the scope of this course. Feel free to toggle these for fun (check 'Help' for more info on why one might bother doing this, but we don't need it here). Instead, select any twelve stars by clicking on them. Notice where they plot on the H-R. Are any results surprising? After selecting twelve, the program plots the locations of another 400 stars for you. The question to answer is: based on the positions of these stars, which age track (there are four colors, each for an age between 2 and 6 billions years) best represents these data? This would be your estimate for the age of the cluster. Note that there is a lot of scatter - the key here is to identify an age track that a nontrivial number of stars most tightly follows. a. 4 billion years
- Radiating objects emit spectra that can be studied to learn about the object's _______. a. Temperature and chemical content
- Which of the following is not a possible aftermath or byproduct of a supernova? a. Electron stars
- Human eyes are most sensitive to which wavelength?
Quiz 2
a. 550nm 5. Sequence the following in increasing wavelengths: a. X-rays, ultraviolet, infrared, radio 6. Suppose we could measure one property of a protostar. Which property would tell us most about its future evolution? a. Its mass 7. Place in order, from youngest to oldest (1 - 4), the sequence of the evolutionary stages of a Sun-like star: a. T-Tauri, Main Sequence, Red Giant, White Dwarf 8. Venus as a whole radiates as a blackbody with average temperature of 230 K. Use Wien's Law to calculate the wavelength of the strongest radiation for this blackbody. a. 12 microns, IR (but closer to visible than microwave) 9. The 'supernova trigger' hypothesis suggests that... a. stellar formation could be initiated by molecular cloud collapse as a result of a nearby supernova 10 a thousand solar masses-worth of interstellar gas forms into a group of stars of all masses. If you came back a billion years later, where would that gas (matter) now be? a. Much still in the same low-mass stars, but some back as interstellar gas or later generations of stars.
Quiz 2 - Sara Miller Quiz 2 material
Course: Our Solar System (ESCI 420)
University: University of New Hampshire
