Question

Using python create function that:

The stars.txt dataset1 consists of temperatures and magnitudes for 7860 nearby stars. The magnitude of stars corresponds to a star’s brightness. A star’s temperature is estimated by the color of light the star emits. Write functions that read the stars.txt file and: • find the hottest star • find the coldest star • find the brightest star • find the darkest star Function name: find_hottest_star() Parameters/arguments: filename Returns: temperature Function name: find_coldest_star() Parameters/arguments: filename Returns: temperature Function name: find_brightest_star() Parameters/arguments: filename Returns: magnitude Function name: find_darkest_star() Parameters/arguments: filename Returns: magnitude

Answer 1

The stars.txt dataset1 consists of temperatures and magnitudes for 7860 nearby stars

(available at http://www-personal.umich.edu/~mejn/computational-physics/stars.txt)

1) Function to find the hottest star:

import numpy as np

def find_hottest_star():

x = np.loadtxt("Desktop/star_folder/stars.txt")

T1,T2= np.genfromtxt("Desktop/star_folder/stars.txt", unpack=True) //binding variables to the columns in the text file

T1max = max(T1) //T1 is temperature & T2 is magnitude

print(T1max)    //hottest star will have maximum temperature,hence max(T1)

find_hottest_star()

Output: 14786.0720701

2)Function to find the coolest star:

import numpy as np
def find_coolest_star():
x = np.loadtxt("Desktop/star_folder/stars.txt")
T1,T2= np.genfromtxt("Desktop/star_folder/stars.txt", unpack=True)
T1min = min(T1)   //coolest star will have minimum temperature,hence min(T1)
print(T1min)
  
find_coolest_star()

Output: 683.14508541

3)Function to find the brightest star:

import numpy as np
def find_brightest_star():
x = np.loadtxt("Desktop/star_folder/stars.txt")
T1,T2= np.genfromtxt("Desktop/star_folder/stars.txt", unpack=True)
T2max = max(T2) //brightest star will have maximum magnitude,hence max(T2)
print(T2max)
  
find_brightest_star()

Output: 18.08

4)Function to find the darkest star:

import numpy as np
def find_darkest_star():
x = np.loadtxt("Desktop/star_folder/stars.txt")
T1,T2= np.genfromtxt("Desktop/star_folder/stars.txt", unpack=True)
T2min = min(T2)   //darkest star will have minimum magnitude,hence min(T2)
print(T2min)
  
find_darkest_star()

Output:  -2.77