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Spectroscopy in stellar astrophysics
... FORMATION OF THE LINES The crucial parameter is the optical depth ζ( ) עof the stellar atmosphere, which is related to the absorption coefficient ( א( עin the atmosphere as follows: ...
... FORMATION OF THE LINES The crucial parameter is the optical depth ζ( ) עof the stellar atmosphere, which is related to the absorption coefficient ( א( עin the atmosphere as follows: ...
Review Guide
... 4. What type of galaxy is most abundant in the universe? 5. What type of galaxy contains both young and old stars? 6. What type of galaxy contains only old stars? 7. What type of galaxy contains only young stars? 8. Besides their shape what other characteristic distinguishes the different types of g ...
... 4. What type of galaxy is most abundant in the universe? 5. What type of galaxy contains both young and old stars? 6. What type of galaxy contains only old stars? 7. What type of galaxy contains only young stars? 8. Besides their shape what other characteristic distinguishes the different types of g ...
H-R Diagram - Faculty Website Listing
... 1. Using Stellarium software to collect the information on absolute magnitude and spectral type of a star to plot an H-R diagram and answer the questions: 2. This Lab will be done in Science room 208. Find one of the available computer stations. Login with your Tarleton ID and fire up Stellarium fro ...
... 1. Using Stellarium software to collect the information on absolute magnitude and spectral type of a star to plot an H-R diagram and answer the questions: 2. This Lab will be done in Science room 208. Find one of the available computer stations. Login with your Tarleton ID and fire up Stellarium fro ...
Astro 1 & 100 Levine Homework Stars Name:____________________________
... You may want to do the lecture-tutorial on pg 33, Apparent and Absolute Magnitude of Stars, prior to doing this portion of the homework, if you need a refresher on m and M. Ranking questions are 2 points each. Consider the following table of stars: ...
... You may want to do the lecture-tutorial on pg 33, Apparent and Absolute Magnitude of Stars, prior to doing this portion of the homework, if you need a refresher on m and M. Ranking questions are 2 points each. Consider the following table of stars: ...
Science 8
... 7. What are the three main characteristics used to classify stars? a. ____________________ ...
... 7. What are the three main characteristics used to classify stars? a. ____________________ ...
I : Internal structure of main sequence stars
... The luminosity L The efficiency of the fusion η The mass of the star M The fraction of the stellar mass that can participate in the fusion reactions f ...
... The luminosity L The efficiency of the fusion η The mass of the star M The fraction of the stellar mass that can participate in the fusion reactions f ...
PowerPoint Presentation - ASTR498E High energy
... The mass of the star M The fraction of the stellar mass that can participate in the fusion reactions f ...
... The mass of the star M The fraction of the stellar mass that can participate in the fusion reactions f ...
Astro 1 & 100 Levine Homework Stars Name:____________________________
... Name:____________________________ ...
... Name:____________________________ ...
Stellar temperatures and spectral types
... • The different spectral types were recognized in the early 1800s. • Why do some stars show strong absorption due to hydrogen and others don’t. • The obvious solution would be to imagine that it is due to differences in the chemical composition of stars. Nope! ...
... • The different spectral types were recognized in the early 1800s. • Why do some stars show strong absorption due to hydrogen and others don’t. • The obvious solution would be to imagine that it is due to differences in the chemical composition of stars. Nope! ...
stars concept review
... _____ 10. A large, bright star whose hot core has used most of its hydrogen is a a. nova. c. giant. b. supernova. d. pulsar. Original content Copyright © Holt McDougal. All rights reserved. Additions and changes to the original content are the responsibility of the instructor. ...
... _____ 10. A large, bright star whose hot core has used most of its hydrogen is a a. nova. c. giant. b. supernova. d. pulsar. Original content Copyright © Holt McDougal. All rights reserved. Additions and changes to the original content are the responsibility of the instructor. ...
Document
... What is the color of the stars with the highest surface temperature? ___________ What is the color of the stars with the lowest surface temperature? ____________ ...
... What is the color of the stars with the highest surface temperature? ___________ What is the color of the stars with the lowest surface temperature? ____________ ...
answers
... each sample? Give students diffraction gratings. Have them look at several elements in discharge tubes. What is important is that they notice that each is clearly different. b) The outer atmosphere of a star contains an atmosphere that absorbs light at these specific wavelengths. Look at the graph a ...
... each sample? Give students diffraction gratings. Have them look at several elements in discharge tubes. What is important is that they notice that each is clearly different. b) The outer atmosphere of a star contains an atmosphere that absorbs light at these specific wavelengths. Look at the graph a ...
H-R diagram worksheet
... Part III: Plotting Stars Mark each of the following on the H-R diagram and label it as indicated. You may use page 15 of your ESRT to help you. 6. Draw and label a long diagonal line showing the approximate location of the main sequence. 7. A large circle indicating the area where you find the bigg ...
... Part III: Plotting Stars Mark each of the following on the H-R diagram and label it as indicated. You may use page 15 of your ESRT to help you. 6. Draw and label a long diagonal line showing the approximate location of the main sequence. 7. A large circle indicating the area where you find the bigg ...
April 1st
... • Not enough mass for fusion • Minimum mass of gas need for fusion is 0.08 solar masses (80 times the mass of Jupiter) ...
... • Not enough mass for fusion • Minimum mass of gas need for fusion is 0.08 solar masses (80 times the mass of Jupiter) ...
The Hertzsprung – Russell Diagram
... For astronomers, a graph that displays a star’s luminosity on the y-axis and its surface temperature on the x-axis sets up an extremely useful diagram called a Hertzsprung-Russell, or H-R Diagram. In 1910 Ejnar Hertzsprung and Henry Norris Russell discovered that when all of the known stars were put ...
... For astronomers, a graph that displays a star’s luminosity on the y-axis and its surface temperature on the x-axis sets up an extremely useful diagram called a Hertzsprung-Russell, or H-R Diagram. In 1910 Ejnar Hertzsprung and Henry Norris Russell discovered that when all of the known stars were put ...
Spectral_Analysis
... must correspond to a previously unknown element. It was given the name helium, after the Greek word helios, meaning "Sun." Only in 1895, almost three decades after its detection in sunlight, was helium discovered on Earth. ...
... must correspond to a previously unknown element. It was given the name helium, after the Greek word helios, meaning "Sun." Only in 1895, almost three decades after its detection in sunlight, was helium discovered on Earth. ...
The Life Cycle of Stars Webquest
... http://www.seasky.org/cosmic/sky7a01.html and answer the following questions: 1. Stars begin their lives as clouds of dust and gas called_____________. 2. What is a protostar? ...
... http://www.seasky.org/cosmic/sky7a01.html and answer the following questions: 1. Stars begin their lives as clouds of dust and gas called_____________. 2. What is a protostar? ...
Quiz Maker - Geneva 304
... 1. From looking at Figure 24-11 in your book, draw the Lyman series and the Balmer series on the same wavelength axis, that is, on a horizontal straight line labeled in angstroms every 500 Å from 500 to 7,000 Å. ...
... 1. From looking at Figure 24-11 in your book, draw the Lyman series and the Balmer series on the same wavelength axis, that is, on a horizontal straight line labeled in angstroms every 500 Å from 500 to 7,000 Å. ...
Startalk
... They have a core that is dense and super hot! Nuclear fusion is the source of their energy! ...
... They have a core that is dense and super hot! Nuclear fusion is the source of their energy! ...
STARS
... Nuclear fusion gives the star enough electromagnetic energy to begin shining and a star is born ...
... Nuclear fusion gives the star enough electromagnetic energy to begin shining and a star is born ...
Stellar Evolution
... • We can “weigh” stars that are in binary systems (two stars orbiting each other). Fortunately, most stars fall into this category. ...
... • We can “weigh” stars that are in binary systems (two stars orbiting each other). Fortunately, most stars fall into this category. ...
Summary: Stellar Distances
... Interstellar dust makes stars look redder over long distances Temperatures can also be inferred from the appearance of a star’s spectrum - the pattern of spectral lines. This spectral typing is not affected by interstellar dust. Surface temperatures of stars almost all lie between 40,000°K for the “ ...
... Interstellar dust makes stars look redder over long distances Temperatures can also be inferred from the appearance of a star’s spectrum - the pattern of spectral lines. This spectral typing is not affected by interstellar dust. Surface temperatures of stars almost all lie between 40,000°K for the “ ...
Space Explorations - Holy Cross Collegiate
... • By attaching spectroscopes to their telescopes, astronomers are able to observe a star’s spectra, but because the distant stars are much dimmer than our Sun, only some of the elements in the spectra can be identified. • Those that cannot be identified remain as inferences, based on what astronomer ...
... • By attaching spectroscopes to their telescopes, astronomers are able to observe a star’s spectra, but because the distant stars are much dimmer than our Sun, only some of the elements in the spectra can be identified. • Those that cannot be identified remain as inferences, based on what astronomer ...
Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Light from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with absorption lines. Each line indicates an ion of a certain chemical element, with the line strength indicating the abundance of that ion. The relative abundance of the different ions varies with the temperature of the photosphere. The spectral class of a star is a short code summarizing the ionization state, giving an objective measure of the photosphere's temperature and density.Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O type) to the coolest (M type). Each letter class is then subdivided using a numeric digit with 0 being hottest and 9 being coolest (e.g. A8, A9, F0, F1 form a sequence from hotter to cooler). The sequence has been expanded with classes for other stars and star-like objects that do not fit in the classical system, such class D for white dwarfs and class C for carbon stars.In the MK system a luminosity class is added to the spectral class using Roman numerals. This is based on the width of certain absorption lines in the star's spectrum which vary with the density of the atmosphere and so distinguish giant stars from dwarfs. Luminosity class 0 or Ia+ stars for hypergiants, class I stars for supergiants, class II for bright giants, class III for regular giants, class IV for sub-giants, class V for main-sequence stars, class sd for sub-dwarfs, and class D for white dwarfs. The full spectral class for the Sun is then G2V, indicating a main-sequence star with a temperature around 5,800K.