Section 3: Three Periodicities - Wobble, Tilt, and
... King) will be the Pole Star (Love). Next will be Vega, then Thuban, and then Polaris again -- each star taking its turn in the 26,000-year precessional cycle. So it is correct to say that there is no one single North Star -- or that Polaris is just the current pole star. ...
... King) will be the Pole Star (Love). Next will be Vega, then Thuban, and then Polaris again -- each star taking its turn in the 26,000-year precessional cycle. So it is correct to say that there is no one single North Star -- or that Polaris is just the current pole star. ...
Universe 8/e Chapter 2 - Physics and Astronomy
... two passages of the Sun across the vernal equinox. Leap year corrections are needed because the tropical year is not exactly 365 days. The sidereal year is the actual orbital period of the Earth. ...
... two passages of the Sun across the vernal equinox. Leap year corrections are needed because the tropical year is not exactly 365 days. The sidereal year is the actual orbital period of the Earth. ...
Lecture 5: Stars
... From spectra we can also get the relative abundances of different elements. Almost all stars are about ¾ H and ¼ He. The Sun is about 2% other elements (other stars vary from almost no other elements to around 5%). Confusingly astronomers call ALL elements other than H and He ‘metals’. (Fe is a ‘met ...
... From spectra we can also get the relative abundances of different elements. Almost all stars are about ¾ H and ¼ He. The Sun is about 2% other elements (other stars vary from almost no other elements to around 5%). Confusingly astronomers call ALL elements other than H and He ‘metals’. (Fe is a ‘met ...
Lecture
... – O star: ~ 1 million years – G star (Sun): ~ 10 billion years – M star : ~ 5,000 billion years ...
... – O star: ~ 1 million years – G star (Sun): ~ 10 billion years – M star : ~ 5,000 billion years ...
The Evening Sky Map
... Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to each other in the sky; either linked by gravity so that they orbit each other (binary star) or lying at different distances from Earth (optical double). Apparent separation of stars is given in ...
... Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to each other in the sky; either linked by gravity so that they orbit each other (binary star) or lying at different distances from Earth (optical double). Apparent separation of stars is given in ...
The Solar Neighborhood
... The globular star clusters are bright, and can be seen for a long distance. Their distances can be estimated accurately from their main sequence turnoffs, as well as by measuring the periods of variable stars that belong to each cluster. In the table below are listed several dozen Galactic globular ...
... The globular star clusters are bright, and can be seen for a long distance. Their distances can be estimated accurately from their main sequence turnoffs, as well as by measuring the periods of variable stars that belong to each cluster. In the table below are listed several dozen Galactic globular ...
Spectroscopy – the study of the colors of light (the spectrum) given
... At this time atomic theory was lacking so all the lines were not understood. (Most importantly, the absence of H-lines was not understood.) It was believed that the abundance of hydrogen varied from lots to none. ...
... At this time atomic theory was lacking so all the lines were not understood. (Most importantly, the absence of H-lines was not understood.) It was believed that the abundance of hydrogen varied from lots to none. ...
September 2011 - Newbury Astronomical Society
... Galaxy, known as Messier 31 (M31), start at Alpheratz. Follow the lower line of stars that form Andromeda to the second star called Mirach. From Mirach move up to the star in the upper line then on an equal distance to a second star. Just to the right of this second star is a fuzzy patch of light, t ...
... Galaxy, known as Messier 31 (M31), start at Alpheratz. Follow the lower line of stars that form Andromeda to the second star called Mirach. From Mirach move up to the star in the upper line then on an equal distance to a second star. Just to the right of this second star is a fuzzy patch of light, t ...
Study Guide #3 Answer Key
... barred spiral galaxy that is part of the Local Group of galaxies. It is one of billions of galaxies in the observable universe. The Milky Way galaxy, as viewed from Earth, itself situated on a spur off one of the spiral arms of the galaxy (see Sun's location and neighborhood), appears as a hazy band ...
... barred spiral galaxy that is part of the Local Group of galaxies. It is one of billions of galaxies in the observable universe. The Milky Way galaxy, as viewed from Earth, itself situated on a spur off one of the spiral arms of the galaxy (see Sun's location and neighborhood), appears as a hazy band ...
PPT - McMaster Physics and Astronomy
... blue, cool is red). L varies by factor of 100 million! -Plot L of a star vs. its colour on a diagram: find that these are correlated with one another. Known as “colour-magnitude diagram”. - Most stars occur along “main-sequence”, where they burn hydrogen. ...
... blue, cool is red). L varies by factor of 100 million! -Plot L of a star vs. its colour on a diagram: find that these are correlated with one another. Known as “colour-magnitude diagram”. - Most stars occur along “main-sequence”, where they burn hydrogen. ...
Lecture 15: The Main Sequence
... against gravitational collapse. Higher pressure=higher temperatures. The higher temperatures lead to greater rates of nuclear fusion which means higher luminosity. Example: Low-mass Star (0.1 MSun) ...
... against gravitational collapse. Higher pressure=higher temperatures. The higher temperatures lead to greater rates of nuclear fusion which means higher luminosity. Example: Low-mass Star (0.1 MSun) ...
Starlight & Stars - Wayne State University Physics and Astronomy
... Consequently, distance is the among the most difficult quantities to measure in astronomy 27 July 2005 ...
... Consequently, distance is the among the most difficult quantities to measure in astronomy 27 July 2005 ...
The Rigel Star - Emmi
... angry about the death of her companion, but forgave Apollo when he helped her hang his image in the sky so that he wouldn’t be forgotten. The Greeks said that this is why the constellation of Orion is visible in the winter, but wavers and vanishes when Scorpio appears in the summer. ...
... angry about the death of her companion, but forgave Apollo when he helped her hang his image in the sky so that he wouldn’t be forgotten. The Greeks said that this is why the constellation of Orion is visible in the winter, but wavers and vanishes when Scorpio appears in the summer. ...
science - Amazon Web Services
... North circumpolar stars. Figure 2 shows seven well-known constellations that are continuously in view in latitudes north of 40°, together with their patterns. These constellations are called north circumpolar constellations since they are continuously above the horizon and appear near the North Pole ...
... North circumpolar stars. Figure 2 shows seven well-known constellations that are continuously in view in latitudes north of 40°, together with their patterns. These constellations are called north circumpolar constellations since they are continuously above the horizon and appear near the North Pole ...
Stars I - Astronomy Centre
... of proto-planetary disks around protostars and so we expect other planetary systems like the Solar System to be quite common • Planets around other stars (extra-solar planets) are extremely hard to see due to glare from the host star • However, since stars and massive planets are in orbit about each ...
... of proto-planetary disks around protostars and so we expect other planetary systems like the Solar System to be quite common • Planets around other stars (extra-solar planets) are extremely hard to see due to glare from the host star • However, since stars and massive planets are in orbit about each ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.