Hertzsprung-Russell DiagramBlueWhiteYellowRed-orangeRedBeteigruseAldebaranGlantsWhite Dwarfs50.00020,00010,0005.0003,000Surface Temperature ('C)Which star listed below is the brightest?O SunO Sirius BO BetelgeuseO Rigele0.buseanu

As it can be seen from Hertzsprung-Russell diagram that the y axis represents brightness which…

Hertzsprung-Russell Diagram Blue or blue White Vellow Red-orange Red Rigel Beteignuse Aldebaran Glants Alpho Centour Sinus B White Dwarfs 10,000 Surface Temperature ('C) 50.000 20,000 6.000 5,000 3,000 Which star listed below is the brightest? O Sun O Sirius B O Betelgeuse O Rigel Brightness Increasing

Hertzsprung-Russell Diagram Blue or blue White Vellow Red-orange Red Rigel Beteignuse Aldebaran Glants Alpho Centour Sinus B White Dwarfs 10,000 Surface Temperature ('C) 50.000 20,000 6.000 5,000 3,000 Which star listed below is the brightest? O Sun O Sirius B O Betelgeuse O Rigel Brightness Increasing

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter19: Celestial Distances

Section: Chapter Questions

Problem 17E: Which of the following can you determine about a star without knowing its distance, and which can...

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Problem 4. Stellar Temperature, Color, and Size a) (Palen, et. al., 2nd, Problem 45) Rigel has a Hipparcos parallax of 0.00412 arcsec. Given Rigel and Betelgeuse appear almost equally bright in the sky, i) which star is actually more luminous? ii) Betelgeuse appears reddish while Rigel appears bluish white. Which star is larger and why? b) (Palen, et. al., 2nd, Problem 46) Sirius is actually a binary pair of two A-type stars. The brighter and fainter of the pair is called the Dog Star and Pup Star, respectively (they are in the constellation Canis Major). The Dog Star is 6,000 times brighter than the Pup Star even though both stars are the same distance from us. Compare the i) temperature ii) luminosities iii) sizes (radii) of these two stars. (CALCULATE using the principles of brightness and the Stefan-Boltzmann law, do not look up the answers! HINT: Star letter type is a measure of temperature)
I don't understand how to solve for (d) and need some help understanding the equation.
Plz answer all parts otherwise skip.
3. Brown dwarfs are ____. a. stars with a very thick dust sphere around them, so they appear “brown” b. low mass M type stars with hundreds of planets c. an anomaly because they are extremely small but have relatively high temperature d. protostars that could not ignite the fusion of hydrogen at their core e. has a surface temperature of 2500 K by fusing hydrogen I asked this question onece already, but the answer I got said the answer was C because "AT 2700K THEY ARE HOT" or something to that effect. I tried to find a way to reply to that thread. My argument was that even if brown dwarfs were 2700k (and my book says that's closer to the temperature of red dwarfs and that brown dwarfs are usually around 1000K). Seeing that we are studying the life cycle and evolution of all stars, wouldn't either of those temperatures be on the relatively COOL side of all star temperatures? Wouldn't the most appropriate answer be D.?
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12. A star with spectral type MO has a surface temperature of 3750 K and a radius of 0.63 Rsun: How many times more luminous is this star than the Sun? (if it is less luminous enter a number less than one) Answer: Submit All Answers Last Answer: 0.0923 Incorrect, tries 1/5. Hint: Use the Luminosity equation, which says that L is proportional to R^2 T^4. If you keep these as ratios compared to the sun, your L will also come out as a ratio compared to the Sun. This star has a mass of 0.4 Msun- Using the simple approximation that we made in class, what is the main sequence lifetime of this star? You may assume that the lifetime of the sun is 1010 yr. Answer: Submit All Answers Compare this to the lifetime of a MO star listed in Table 22.1 (computed using a more sophisticated approach). Is the value you calculated in the previous problem longer or shorter than what is reported in the table? (L for longer, S for shorter) (You only get one try at this problem.) Answer: Submit All Answers
hand write for god sake
4. on the ONLY next page compare differences in and luminosity (more or Refer to the figure following questions. temperature (hotter or cooler) less luminous) as determined from the diagram. In other words, consider only what you know about relationships between temperature versus luminosity, diameter luminosity, or color versus temperature relationships. make NOT *IMPORTANT NOTE: DO stars' masses or stage of life answer. any versus reference to the for your as a reason a) WOLF 28 and PROCYON have roughly the same surface temperature. Which star is smaller in diameter? (Explain which property of the star supports your reasoning. Review directions above.) b) BETELGEUSE and SANDULEAK have about the same luminosity. Which star is larger in diameter? (Explain which property of the star supports your reasoning. Review directions above.) c) VEGA and ZZ CETI have about the same temperature. Which star is smaller in diameter? (Explain which property of the star supports your reasoning. Review…