Sirius is the brightest star in the night sky mainly because it is so close to...
Sirius is the brightest star in the night sky mainly because it is so close to us. The parallax of Sirius is 0.37900, and its apparent magnitude is -1.46. Is it intrinsically more luminous or less luminous than the Sun?
Homework Answers
Yes, it is true that sirius appear fainter than sun but this is due to it's great distance from us. In actual, sirius is much more luminous than the sun. In fact, sirius is 25 times more luminous than the sun (apparent magnitude of around -26.8)
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Sirius is the brightest star in the night sky mainly because it
is so close to...
Sirius The brightest star in the night sky is Sirius, which is at a distance of...
Sirius The brightest star in the night sky is Sirius, which is at a distance of 8.30×1016 m, when we look at this star, how far back in time are we seeing it? Express your answer in years. Submit Answer Tries 0/15
Sirius, the brightest star in the sky, is a main-sequence star, as is the Sun, but...
Sirius, the brightest star in the sky, is a main-sequence star, as is the Sun, but Sirius has a luminosity about 27 times that of the Sun and a mass about 3 times that of the Sun. Use this information to determine which star will live longer, and by what factor, approximately.
(a) The observed parallax of Sirius, the brightest star in the sky, is 0.375 arcseconds. How...
(a) The observed parallax of Sirius, the brightest star in the sky, is 0.375 arcseconds. How far away is it in parsecs? In light years? (b) The Hipparcos spacecraft could measure parallaxes as small as 0.001 a How distant is the furthest star for which we can measure parallax? How does this distance compare to the size of the galaxy!
The star Sirius has an apparent magnitude ?V = −1.46 and a parallax ? = 0.37921”.(a)...
The star Sirius has an apparent magnitude ?V = −1.46 and a parallax ? = 0.37921”.(a) Calculate its distance and absolute magnitude. (b) What would Sirius’ parallax be if it were measured from an observatory on Neptune’s moon Triton as Neptune orbited theSun?
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed...
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed luminosity is about 20 LO How can you explain the difference? The mass-luminosity relationship predicts that Sirius is about Sirius's higher luminosity is a result of its higher Sun's. Themassluninosit reSisis a times more luminous than the Sun. surface temperature and lrger surface area compared to the
YOU FOCUS YOUR ATTENTION ON THE STARS that are contained within or very close to THE CONSTELLATIO...
YOU FOCUS YOUR ATTENTION ON THE STARS that are contained within or very close to THE CONSTELLATIONS OF THE ZODIAC groups such as Taurus the Bulland Gemini the Twins (etc). Page 20 of 34 and stars very close to the zodiac constellations such as Sirius (the Dog Star) & Betelgeuse (the Hunter's Shoulder) From here on in this exam, the word STAR will always be used to refer to such objects- to constellations. Even ifyou have learned somewhere that our...
C. i. As a star runs out of hydrogen to fuel nuclear fusion in its core,...
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choose A B C D QUESTION 1 Star formation in giant gas clouds is a result of competition between which forces? Light and rotation Light and dark Rotation and gas pressure Gravity and gas pressure 10 points QUESTION 2 What effect sets the largest size a star can have? The forming star is shining so strongly that it blows the collapsing gas cloud apart. If the star was any larger it would instantly form a Black Hole. If the...
choose correct answer. no explanation needed QUESTION 36 What does the apparent magnitude of a star...
choose correct answer. no explanation needed
QUESTION 36 What does the apparent magnitude of a star tell us about that star? its mass how bright it appears from Earth its radius how much energy it is emitting QUESTION 37 What is the reason sunspots appear darker than surrounding regions on the Sun's surface? They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere. They are too cold to emit any visible light. They...
5) A star (no matter what its mass) spends most of its life Select one: a....
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Sirius The brightest star in the night sky is Sirius, which is at a distance of 8.30×1016 m, when we look at this star, how far back in time are we seeing it? Express your answer in years. Submit Answer Tries 0/15
(a) The observed parallax of Sirius, the brightest star in the sky, is 0.375 arcseconds. How far away is it in parsecs? In light years? (b) The Hipparcos spacecraft could measure parallaxes as small as 0.001 a How distant is the furthest star for which we can measure parallax? How does this distance compare to the size of the galaxy!
ity of the 20 Mo star Sirius predicted by the mass-luminosity equation (Unit 58). Its observed luminosity is about 20 LO How can you explain the difference? The mass-luminosity relationship predicts that Sirius is about Sirius's higher luminosity is a result of its higher Sun's. Themassluninosit reSisis a times more luminous than the Sun. surface temperature and lrger surface area compared to the
YOU FOCUS YOUR ATTENTION ON THE STARS that are contained within or very close to THE CONSTELLATIONS OF THE ZODIAC groups such as Taurus the Bulland Gemini the Twins (etc). Page 20 of 34 and stars very close to the zodiac constellations such as Sirius (the Dog Star) & Betelgeuse (the Hunter's Shoulder) From here on in this exam, the word STAR will always be used to refer to such objects- to constellations. Even ifyou have learned somewhere that our...
C. i. As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 100 times that of the Sun, but a surface temperature 0.4 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is...
choose correct answer. no explanation needed
QUESTION 36 What does the apparent magnitude of a star tell us about that star? its mass how bright it appears from Earth its radius how much energy it is emitting QUESTION 37 What is the reason sunspots appear darker than surrounding regions on the Sun's surface? They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere. They are too cold to emit any visible light. They...
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