Expired Stars

Do you know about expired stars?

How much do you know about astronomy? How about expired stars

Today we have challenging questions about dead stars based on the article “Expired Stars” by Roy Bishop in the Observer’s Handbook 2019.

I created seven questions that could be answered without reading this chapter.

You have up to ten minutes to complete the challenge today.

Begin now. Do your best.

ASTRONOMY CHALLENGE

  1. On what day last week did Doris Day die?

Screen Shot 2019-05-23 at 10.49.11 AM

  1. If the core of a star is less than 1.4 solar masses (the Chandrasekhar Limit) what will it become when fusion in the core stops?

    Screen Shot 2019-05-23 at 10.55.24 AM
     Chandrasekhar

     

  2. The only white dwarf observable in a small telescope is in what constellation?

  1. If the core of a dying star is between 1.4 solar masses and 3 solar masses, it will likely become what kind of expired star?

  2. Where can a small telescope indirectly observe a neutron star about 6,000 light years away?

  1. If the core of a dying star is greater than 3 solar masses, it will likely become what kind of expired star?

  1. In what constellation can we see in a small telescope the companion star of the stellar black hole Cygnus X-1?

OK, pencils down. Scroll down for directions for checking your answers.

Please read directions below:

Step 1: Please contribute to one of these charities linked below. If you are a winner and contribute, please ask recipient to notify me of the amount so I might match the first $100.

  • Michael J. Fox Foundation for Parkinson’s Research

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https://www.michaeljfox.org/

Click on “Get Involved”

  • Guilford County Animal Shelter

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       http://www.myguilford.com/animal-services/animal-shelter/

               Look under “Donate to the Animal Shelter.”

  • Guilford Senior Resources

  • Screen Shot 2018-06-25 at 5.25.17 PM

http://senior-resources-guilford.org/

Look under “You Can Help”

  • Jo Cline Memorial Endowment

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https://www.gtcc.edu/community-engagement/cline-observatory/support-the-observatory-jo-cline.php

Step 2: Check your written answers to the answers below. If your answer is correct, give it a check mark.

Step 3: If your answer is wrong, put a small X.

Step 4: If you think my answer is questionable, write yourself a note, do the research and let me know if I’ve erred. Thanks in advance,

You are welcome to play with us during the next live broadcast of

“Let’s talk astronomy” this coming Monday beginning at 8 am eastern US time on Periscope.

Periscope is a live video streaming app for Android and iOS available in the App Store.

Our previous Astronomy Challenge was about expired stars.

The questions are given above, the correct answers and the winners are given below.

Congratulations to all winners and thank-you to all participants.

Play the Astronomy Challenge live on Periscope’s “ Let’s talk astronomy” 8 am (Eastern US time) on Mondays.

Correct Answers……..Periscope Winners:

  • On what day last week did Doris Day die? ANSWER: Monday, May 13……. @joelschultz  Two weeks before, on May 6, I announced the topic of our 5/20 Challenge, and I was trying to be funny and gave the name “Rock Hudson” as an example of a star who has died. Then I gave the name “Doris Day” as an example and was quickly corrected by one of the viewers. I apologized for my error, and continued on with that broadcast. Now, Doris Day is an expired star.

  • If the core of a star is less than 1.4 solar masses (the Chandrasekhar Limit) what will it become when fusion in the core stops?     ANSWER: White Dwarf ……@tiki   Our Sun will probably become a White Dwarf after a red giant phase.

  • The only white dwarf observable in a small telescope is in what constellation? ANSWER: Eradinus………@ ? No one got the correct answer in my broadcast. The nearest, observable White Dwarf is “Omicron 2 Eradini B” about 16 light years away.

  • Screen Shot 2019-05-23 at 10.53.36 AM
  • If the core of a dying star is between 1.4 solar masses and 3 solar masses, t will likely become what kind of expired star? ANSWER: neutron star……@tiki   To have a core of this mass, the total star must be about 8 or more solar masses.

  • Where can a small telescope indirectly observe a neutron star about 6,000 light years away?    ANSWER: Crab Nebula,….@tiki   No neutron stars are visible in a small telescope. M1, the Crab Nebula, was caused by a supernova that was visible from Earth in the year 1054 A.D.

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    M 1 the Crab Nebula is powered by the Crab Pulsar, a rapidly spinning neutron star.
  • If the core of a dying star is greater than 3 solar masses, it will likely become what kind of expired star? ANSWER: black hole……@BonzoixofMN said “Supernova” which is the event.   @doomonu2 first commented with the words “black hole.”  A star would have to be at least 20 solar masses to retain a core of more than 3 solar masses. “Within seconds, spacetime itself closes around the imploding stellar core, removing all but the core’s gravitational field from the observable universe.” Page 306

  • In what constellation can we see in a small telescope the companion star of the stellar black hole Cygnus X-1?   ANSWER: Cygnus….@Suyog_92 This was discovered by Dr. Tom Bolton at the David Dunlap Observatory near Toronto.

Next challenge: The Deep Sky: nebula

If you find a mistake, please let me know.

Thanks goes out to all participants,

and

Congratulations to everyone who got one right.


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