H R Diagram Online Activity
NAME:________________________________________
http://aspire.cosmic-ray.org/labs/star_life/hr_diagram.html
PERIOD: _______________
“Hertzsprung-Russell Diagram” page:
* Read the first paragraph to find this answer:
1. What is a Hertzsprung-Russell Diagram? ___________________________________________________
* Look at the paragraphs below the pic of a HR Diagram… Find and complete these sentences:
2. “The position of each dot on the diagram tells us two things about each star: its _____________________ (or
absolute magnitude) and its _____________________________”
3. “The vertical axis represents the star’s ________________________ or absolute magnitude. Luminosity is
technically the amount of ________________ a star radiates in one _________________, but you can think of it as
how ___________________ or how dim the star appears.”
4. “The horizontal axis represents the star’s ___________________ _______________________ (not the star’s core
temperature – we cannot see into the core of a star, only its surface)! Usually this is labeled using the
___________________ temperature scale.”
5. “On this diagram, the higher (_____________) temperatures are on the _____________, and the lower
(_________________) temperatures are on the ____________________.”
6. “A star in the ____________ ____________ corner of the diagram would be ________ and ___________. A star in the
_____________ _____________corner of the diagram would be ________ and ____________. The Sun rests
approximately in the ________________ of the diagram, and it is the star which we use for comparison. A star
in the _______________ ____________ corner of the diagram would be ___________ and ___________. A star in the
lower right corner of the diagram would be __________ and __________.”
* Scroll down and click the pic under the “Interactive Lab”.
* Find out what the correct labels are for each of the stars on the diagram. Write them below in the table:
7.
Star Name
(a)
Betelgeuse
(b)
Alpha Centauri B
(c)
Sun
(d)
Vega
(e)
Sirius B
Temperature (Kelvins)
Brightness (Luminosity)
8. Are there any stars that are really hot but not very bright? Y / N Which one(s)? __________________
9. Are there any stars that are not very hot but they shine very brightly? Y / N Which one(s)?
_____________________
10. Complete these sentences: “Most of the stars lie within a region called the _________ _____________. It looks
kind of like a _____________ line sloping from the upper-_________ to the ______________-right of the HR
diagram.”
11. Complete these sentences: “We know that _____________ things are brighter. A hotter temperature means
that _____________ energy is radiated into space. Bigger stars are _______________. A bigger __________________
area means that more energy is radiated into space.”
Click the forward arrow at the bottom of the page to go to the page labeled “APPLICATIONS of the H R
DIAGRAM”. Do the “Interactive Lab” by clicking the image to begin the activity.
Work your way through the lab by reading the information and answering the questions along the
way…
Print the answers you typed in the final part of the lab, write “LAB QUESTIONS” on it and staple the
sheet to this page.
Click to the next page titled “Interactive HR Diagrams”. Scroll down the page to the HR diagram
under “More HR diagram Fun”. Click the picture for interactive version with questions. Answer the
questions and write the correct answers below:
1. _________
2. (multiple answers) _________, __________, & __________
3. _________
4. _________
5. _________
6. (put letter and word answer) _________, _________________
7. _________
8. (put letter and word answer) _________, _________________
9. _________
10. (put letter and word answer) _________, _________________
11. _________ ( Y / N )
12. _________ ( Y / N )
13. ___________________________________________
14. ___________________________________________
Yeah! You’re done!!! You’re such a “star” student. Turn it in… 