AST 443/PHY 517 Homework 1
... Which, if any, are above the horizon? 4. Which of these 5 stars can be observed at some time on this night from Cerro Tololo? At what times? 5. Which of these 5 stars is closest to the moon? What is the angular distance? 6. The sidereal time at midnight advances by 3m 56s each day. What are the best ...
... Which, if any, are above the horizon? 4. Which of these 5 stars can be observed at some time on this night from Cerro Tololo? At what times? 5. Which of these 5 stars is closest to the moon? What is the angular distance? 6. The sidereal time at midnight advances by 3m 56s each day. What are the best ...
cifutielu`s Astronomy Test 2014
... 5. _____ Supergiants that are 4 to 20 times more massive than the Sun and are 100,000 times more luminous. 6. _____ Red giants with a pulsation period greater than 100 days and are less than two solar masses massive. ...
... 5. _____ Supergiants that are 4 to 20 times more massive than the Sun and are 100,000 times more luminous. 6. _____ Red giants with a pulsation period greater than 100 days and are less than two solar masses massive. ...
Physics-Y11-LP3 - All Saints` Catholic High School
... • understand the role of observations of Cepheid variable stars in establishing the scale of the Universe and the nature of most spiral nebulas as distant galaxies • describe some of the new information that telescopes revealed about the Milky Way and objects beyond the Milky Way • recall the main i ...
... • understand the role of observations of Cepheid variable stars in establishing the scale of the Universe and the nature of most spiral nebulas as distant galaxies • describe some of the new information that telescopes revealed about the Milky Way and objects beyond the Milky Way • recall the main i ...
Spectral Classification
... B stars are extremely luminous and blue. As O and B stars are so powerful, they live for a very short time. They do not stray far from the area in which they were formed as they don't have the time. They therefore tend to cluster together in what we call OB1 associations. and contains all of the con ...
... B stars are extremely luminous and blue. As O and B stars are so powerful, they live for a very short time. They do not stray far from the area in which they were formed as they don't have the time. They therefore tend to cluster together in what we call OB1 associations. and contains all of the con ...
Project 4: The HR diagram. Open clusters
... temperature, high luminosity stars to low temperature, low luminosity stars. These are the main sequence stars. Our Sun is one of them. There are a few stars that are not in this diagonal strip. There are some low temperature, high luminosity stars ‐ these are called giants and super ...
... temperature, high luminosity stars to low temperature, low luminosity stars. These are the main sequence stars. Our Sun is one of them. There are a few stars that are not in this diagonal strip. There are some low temperature, high luminosity stars ‐ these are called giants and super ...
Eruptive Variables - Scientific Research Publishing
... As regards the conditions of equilibrium of a star, it is necessary to take account the radiation pressure. The formulae from the theory enable in to calculate what proportion of the weight of the stellar mass is borne by the radiation pressure, and what part being supported by the hot gases pressur ...
... As regards the conditions of equilibrium of a star, it is necessary to take account the radiation pressure. The formulae from the theory enable in to calculate what proportion of the weight of the stellar mass is borne by the radiation pressure, and what part being supported by the hot gases pressur ...
The HR Diagram (PowerPoint version)
... The stars do not differ significantly in composition! They are ~ 2/3 H, ~ 1/3 He, with just a few percent of everything else (at least in the outer parts, which is what the spectrum tells us about) Incidentally, helium was first detected in the solar spectrum (hence its name, from the Greek ‘helios’ ...
... The stars do not differ significantly in composition! They are ~ 2/3 H, ~ 1/3 He, with just a few percent of everything else (at least in the outer parts, which is what the spectrum tells us about) Incidentally, helium was first detected in the solar spectrum (hence its name, from the Greek ‘helios’ ...
H-R Diagram
... now known as a Hertzsprung-Russell diagram, or H-R diagram, is still used today to classify stars into groups. Question: What does an H-R diagram reveal about star types? 1. Observe: Look at the temperature axis on the diagram. What is unusual about this axis? ...
... now known as a Hertzsprung-Russell diagram, or H-R diagram, is still used today to classify stars into groups. Question: What does an H-R diagram reveal about star types? 1. Observe: Look at the temperature axis on the diagram. What is unusual about this axis? ...
Magnitude. . . ?
... class simply by using their own word for “size”. “Magnitude” is foreign word for them, and is not felt as a synonym for size. E.g., in German, the brightness class is called Größe, in Czech it is velikost. Both these languages have one more advantage over English: they have a standard (maybe felt a ...
... class simply by using their own word for “size”. “Magnitude” is foreign word for them, and is not felt as a synonym for size. E.g., in German, the brightness class is called Größe, in Czech it is velikost. Both these languages have one more advantage over English: they have a standard (maybe felt a ...
Can`t tell –depends on how much hotter the small one is relative to
... Imagine you are comparing the abilities of electric hot plates of different sizes and temperatures to cook fully two identical large pots of spaghetti. Note that the pots are all as large as the largest hot plate. When a hot plate is at one of the temperature settings (low, med, high), the hot plate ...
... Imagine you are comparing the abilities of electric hot plates of different sizes and temperatures to cook fully two identical large pots of spaghetti. Note that the pots are all as large as the largest hot plate. When a hot plate is at one of the temperature settings (low, med, high), the hot plate ...
Stars (Ch. 13)
... • But as we already know we can learn a lot from light! • Light can tell us about a star’s: ...
... • But as we already know we can learn a lot from light! • Light can tell us about a star’s: ...
Searching for the Most Distant Black Holes in the Early
... – should be strong X-ray sources (from hot gas) – should be strong infrared sources (from hot dust) – should have very faint (or none) optical emission ...
... – should be strong X-ray sources (from hot gas) – should be strong infrared sources (from hot dust) – should have very faint (or none) optical emission ...
Practice Questions for Final
... B. A spaceship passing near a 10 solar mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar mass mainsequence star. C. If you watch someone else fall into a black hole, you will never see them cross the event horizon. However ...
... B. A spaceship passing near a 10 solar mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar mass mainsequence star. C. If you watch someone else fall into a black hole, you will never see them cross the event horizon. However ...
Complete the “Assess Your Understanding” including
... _________________, they use ________________________________ to describe sizes and distances in the universe. They use a unit called the _________________ to measure distances between the __________________. Complete the “summarize” on page 96. Light travels at ____________________________ meters pe ...
... _________________, they use ________________________________ to describe sizes and distances in the universe. They use a unit called the _________________ to measure distances between the __________________. Complete the “summarize” on page 96. Light travels at ____________________________ meters pe ...
Stars part 1
... 1. Distance - using Cepheid variable stars, et al. Cepheid variable stars brighten and dim at regular intervals, due to a regular swelling and shrinking of the star. The brighter the star, the longer the period of brightening and dimming. ...
... 1. Distance - using Cepheid variable stars, et al. Cepheid variable stars brighten and dim at regular intervals, due to a regular swelling and shrinking of the star. The brighter the star, the longer the period of brightening and dimming. ...
July 2014 BRAS Newsletter - The Baton Rouge Astronomical Society
... Rukbalgethi Shemali (Tau Her), “The Northern Knee”, mag. 3.91, 16 19 44.45 +46 18 47.8, is a blue sub-giant star. Tau Her was the north pole star around the year 7400 BC, and will be the closest bright star to the pole once again in 18,400 AD. Kajam (Omega Her), “The Club”, mag. 4.57, 16 25 24.93 +1 ...
... Rukbalgethi Shemali (Tau Her), “The Northern Knee”, mag. 3.91, 16 19 44.45 +46 18 47.8, is a blue sub-giant star. Tau Her was the north pole star around the year 7400 BC, and will be the closest bright star to the pole once again in 18,400 AD. Kajam (Omega Her), “The Club”, mag. 4.57, 16 25 24.93 +1 ...
14 Things You Didn`t Know About How the Sun Will Die
... 6. The dying star isn't completely dead yet, however. Gravity pushes shells of hydrogen and helium to densities where nuclear fusion can begin, and they are ignited, albeit for a short time. When this happens with the Sun, it will briefly be 2,100 times brighter than we see it now. 7. Some 7 or 8 bi ...
... 6. The dying star isn't completely dead yet, however. Gravity pushes shells of hydrogen and helium to densities where nuclear fusion can begin, and they are ignited, albeit for a short time. When this happens with the Sun, it will briefly be 2,100 times brighter than we see it now. 7. Some 7 or 8 bi ...
Lect16-3-28-and-30-1..
... smaller “center” ring of the trio was seen previously. The larger pair of outer rings were also seen in ground-based images, but their interpretation was not possible until the higher resolution Hubble observations. Though all of the rings probably are inclined to our view (so that they appear to in ...
... smaller “center” ring of the trio was seen previously. The larger pair of outer rings were also seen in ground-based images, but their interpretation was not possible until the higher resolution Hubble observations. Though all of the rings probably are inclined to our view (so that they appear to in ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.