ASTRONOMY HOMEWORK

Here is a set of real deep-space spectra that include some stars (and galaxies!)

http://skyserver.sdss.org/dr16/en/tools/getimg/plate.aspx?choosesurvey=sdss&P=1125899951184832512&S=1868993899549190144&B=4037477152865658880&A=apogee.apo25m.s.r12.10001.57372

Don't use plagiarized sources. Get Your Custom Essay on
ASTRONOMY HOMEWORK
Get an essay WRITTEN FOR YOU, Plagiarism free, and by an EXPERT!
Order Essay

All you have to do is find spectra of two stars (called “STAR” on the page) where the temperature of one of them is clearly greater than the other.

Then upload a screenshot of each star (this lab allows 2 file uploads) and indicate which one is the hotter and which is cooler. The point of this exercise is to make sure you can correctly compare the temperatures of two stars based on their spectra. Then continue below to complete the assignment.

We’ll need to use the equation

L=
R
2
T
4
L=R2T4

in solar units, and solving for the radius we’ll get

R=
L
T
4




R=LT4

So what we need to find is the temperature (T) of Arcturus and its luminosity (L). The temperature is easy! Suppose we see a spectral peak for Arcturus at 700 nm.

(A) Use Wien’s Law to find the temperature, and divide by the Sun’s temperature (5800 K) to find it in “solar units”

(B) Now to find L: We know from parallax measurements that Arcturus is 11.26 pc away. Remember that each parsec is about 200,000 AU, so calculate how many AU away Arcturus is (in other words, how many times farther away is Arcturus than the Sun?)

(C) Almost there! We know that brightness decreases as the square of the distance, so square your answer to (B) to find how many times dimmer the Sun would appear to be at that distance.

(D) We can measure that Arcturus is actually 30 billion (30×10^9) times dimmer than the Sun appears to us, so divide (C) by this number to see how many times brighter Arcturus “really” is as compared to the Sun at the same distance (this is its luminosity, in solar units)

(E) Ok, now plug the T (from part (A)) and this L into the above equation to find how big Arcturus is (your answer will be in solar units)

(just enter your answers for (A) through (E) in the text box)

Homework Ocean
Calculate your paper price
Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

Professional and Experienced Academic Writers

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

24/7 Customer Support

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:
$0.00

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.

Essays

Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.

Admissions

Admission Essays & Business Writing Help

An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.

Reviews

Editing Support

Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.

Reviews

Revision Support

If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.

× Contact Live Agents