Question

i need help with 3-9

pret uie ale he appluly dlagonal line of data points. For reference, the values for the Sun are M +4.85, B-V +0.63. 2. Theoretical Stellar Models and Evolutionary Tracks The theoretical Zero-Age Main Sequence' (-ZAMS) is defined as the set of computer models representing stars that have just started converting H to He in their cores via thermonuclear fusion. a. Plot the 4 ZAMS data points for each mass from Table 3. Then connect those points using dashed- line segments. The 4 ZAMS points are those points with age-zero. b. A set of evolution models for a specific mass is defined as an 'evolutionary track' as it shows how a star evolves in time as its temperature and luminosity change. An evolutionary track starts at age = zero. Connect the points of a specific track with straight-line segments. Clearly label each track with its correct stellar mass (1, 2, 5, and 9 Mo, where Mo 1 solar mass) . 3. For the Hyades, interpret the nature of the stars near (1.0, 1.0)-what type of star are they? 4. Predict approximately the value of stellar mass you would assign to the stars at (1.0, 1.0). Is there any danger in predicting these masses? 5. Describe what is occurring near (B -V)0.1-0.2, absolute magnitude 1.0-2.02 son of claster M45 to the Hyades: plot the points from Table 2. What does it show? and distinguish the M45 plot from the Hyades plot to He in its core. Note the difference between points at (0.6,10) and (0.6,5) in Figure AP8. Summarize what you did in question 7 from the point of view of astrophysics (Think! Think about .9 Compare Figure 2 with your plot of the Hyades and M45 (Figure 1). What is different about this main sequence is the only stable location in (T, L) or equivalendly, (B - V M) for any ball of you must slide the points of M45 vertically to match the Hyades. Te y-acis of the plotu) Describe or express the importance of the vertical slikding' in a brief plot? Distinguish it from Figure 1 and describe what is occurring. Why are there so few stars at magnitades fainter than 16 and B-V>1.0? e Magnitude plot: Hyades Cluster (from Jobnson et al. 1962, ApJ, 136, 75) no. My BV no. My BV no. My B-V no. My BV 2 0.99 0.98 3 1.00 0.20 4 1.01 0.97 6 1.15 0.05 7 1.81 0.15 8 2.01 0.27 9 2.170.21 10 2.680.27 i 3.050.28 i2 3.15031 13 3.91 0.35 14 4.09 0.41 15 4.16 0.47 16 4.59 0.56 17 4.73 0.59 18 4.87 0.61 19 4.93 0.58 20 5.36 0.69 21 5.41 0.70 22 5.56 0.71 23 5.59 0.75 24 5.68 0.73 25 5.99 0.80 26 6.19 0.85 27 6.29 0.87 28 6.36 0.90 29 6.48 0.93 30 6.57 0.95 31 6.61 0.97 32 6.68 0.99 5 1.05 1.01 33 6.82 1.01 34 6.95 1.05 35 7.01 1.08 36 7.20 1.10 37 7.28 1.13 38 7.37 1.19 39 7.41 1.18 40 7.46 1.1,4 41 7.47 1.24 42 7.59 1.23 43 7.83 1.27 44 7.99 1.29 458.31 1.22 468.44 1.37 478.57し39 488.63140 49 8.70 1.30 50 9.01 1.44 51 9.45 1.47 52 9.75 1.48 53 10.04 1.49 54 10.13 1.50 55 10.64 1.56 56 10.81 160 57 11.04 1.64 58 11.53 1.59 59 12.03 1.65 60 12.21 1.60 Table 2: Open Cluster M45 star my B-v star my B-V star my B-V star my B-V star my B-v 133 14.4 1.28 950 4.2 -0.10 1309 9.5 0.47 1797 10.1 0.56 2425 6.2 0.05 165 7.6 0.12 1040 15.8 1.44 1355 14.0 1.23 1924 10.3 0.62 2588 13.1 1.22 345 11.6 0.84 1103 14.8 1.47 1432 2.9 -0.09 2168 3.6 -0.08 2601 15.0 1.55 11.9 0.90 1234 6.8 0.02 1454 12.8 1.16 2181 5.1 -0.08 2655 155 1.36 697 8.6 0.35 1266 8.3 0.36 1516 14.0 1.31 2209 14.1 1.47 2870 12.5 1.07 804 7.9 0.20 1305 13.5 1.18 1766 9.1 0.47 2406 11.1 0.76 2881 11.8 0.86

Answer 1

gol Given-Gal commuision of claston Mas to -tGe Hindep: alue givend toble Ba usi te given -table ae have to duaco -60 tabla calulabe a absoluke mpoitude-ba -tle epen Mus clusta -G distance in pasees 134 pasas Hm-5

6G 25 3 4 t-001 t- 000000 子 6 466 4669G9 355 4-1361119 ~18 bl

12 ea 0.5 15 B- .S

distinct difoaor Kspen elt Hle clust dacă eased 廾