Lecture Notes
... They were discovered in the 1940s by Carl Seyfert and appear as normal spirals, but with very bright nuclei and emit strong non-thermal spectrum. The visible spectrum contains broad (5 000–10 000 km/s) emission lines indicating clouds of gas moving at very high speeds in the nucleus of the galaxy. ∼ ...
... They were discovered in the 1940s by Carl Seyfert and appear as normal spirals, but with very bright nuclei and emit strong non-thermal spectrum. The visible spectrum contains broad (5 000–10 000 km/s) emission lines indicating clouds of gas moving at very high speeds in the nucleus of the galaxy. ∼ ...
Distance
... Inverse Square Law of Brightness The Apparent Brightness of a source is inversely proportional to the square of its ...
... Inverse Square Law of Brightness The Apparent Brightness of a source is inversely proportional to the square of its ...
Measuring colour in astronomy
... Many of the galaxies imaged by SDSS are too far away to make out individual features, so one has to measure the spectrum and colour of a whole galaxy. Since the light from a galaxy is just the sum of all the light from the individual stars of which it is made, its spectrum – and hence its colour – i ...
... Many of the galaxies imaged by SDSS are too far away to make out individual features, so one has to measure the spectrum and colour of a whole galaxy. Since the light from a galaxy is just the sum of all the light from the individual stars of which it is made, its spectrum – and hence its colour – i ...
Exploring and Observing the Sun and Stars
... like a lion. Some were named after imaginary animals, like a dragon. ...
... like a lion. Some were named after imaginary animals, like a dragon. ...
Observations and Theoretical Models of Subdwarfs
... bugles of spirals, and globular clusters -- in other words, any region consisting solely of old stellar populations –and found that there was an inexplicable excess of ultraviolet radiation being emitting from the regions which could not be attributed to the observed stars [19]. This was later terme ...
... bugles of spirals, and globular clusters -- in other words, any region consisting solely of old stellar populations –and found that there was an inexplicable excess of ultraviolet radiation being emitting from the regions which could not be attributed to the observed stars [19]. This was later terme ...
transparencies
... decrease from a few emissions per 10 years to a few emissions per 100 years • The amplitude should decrease, because the angular velocity is reduced • Both feautures reflect the progressive draining of the energy source wich, in this model, is the Rotational Energy ...
... decrease from a few emissions per 10 years to a few emissions per 100 years • The amplitude should decrease, because the angular velocity is reduced • Both feautures reflect the progressive draining of the energy source wich, in this model, is the Rotational Energy ...
1 - Uplift North Hills Prep
... The star Antares is a red supergiant star in the constellation Scorpius. (a) Describe three characteristics of a red supergiant star and state what is meant by a constellation. ...
... The star Antares is a red supergiant star in the constellation Scorpius. (a) Describe three characteristics of a red supergiant star and state what is meant by a constellation. ...
1:45 PM TuTh This is a one-quarter course on
... including logarithms, simple trigonometry, and fractional powers, and has some familiarity with basic scientific concepts and reasoning. Elementary calculus will some times be used in classroom derivations because, for those understanding calculus, it is the easiest and clearest way of obtaining res ...
... including logarithms, simple trigonometry, and fractional powers, and has some familiarity with basic scientific concepts and reasoning. Elementary calculus will some times be used in classroom derivations because, for those understanding calculus, it is the easiest and clearest way of obtaining res ...
Virtual HR Diagram Lab
... 8. Uncheck show luminosity classes and check show instability strip. Note that this region of the HR Diagram indicates where pulsating stars are found such as RR Lyrae stars and Cepheid variable stars. These stars vary in brightness because they are pulsating-alternately growing bigger and smaller- ...
... 8. Uncheck show luminosity classes and check show instability strip. Note that this region of the HR Diagram indicates where pulsating stars are found such as RR Lyrae stars and Cepheid variable stars. These stars vary in brightness because they are pulsating-alternately growing bigger and smaller- ...
Rotation in the ZAMS: Be and Bn stars
... Figure 3a shows the apparent V=7 magnitude limited counts of dwarf Be stars relative to dwarf B stars. There is an apparent lack of dwarf Be stars cooler than spectral type B7. This could be due to genuine Be stars whose discs are minute and/or too cool for the Hα emission be detectable and/or, to f ...
... Figure 3a shows the apparent V=7 magnitude limited counts of dwarf Be stars relative to dwarf B stars. There is an apparent lack of dwarf Be stars cooler than spectral type B7. This could be due to genuine Be stars whose discs are minute and/or too cool for the Hα emission be detectable and/or, to f ...
Microsoft Word 97
... 7) In the directions in which we see the Milky Way in the sky, we are looking through the relatively thin, pancake-like disk of matter that forms a major part of our Milky Way Galaxy. a) This disk is about 90,000 light years across, an enormous, gravitationally bound system of stars. b) The Milky Wa ...
... 7) In the directions in which we see the Milky Way in the sky, we are looking through the relatively thin, pancake-like disk of matter that forms a major part of our Milky Way Galaxy. a) This disk is about 90,000 light years across, an enormous, gravitationally bound system of stars. b) The Milky Wa ...
Astronomy 21 – Test 2 – Answers
... f) What is a Helium Flash? What is “degeneracy” and what role does it play in the Helium Flash? Which types of stars have a Helium flash and which do not? Explain why some stars do not have a Helium Flash? A helium flash is the explosive onset of He-to-C fusion (it is a core explosion that is actual ...
... f) What is a Helium Flash? What is “degeneracy” and what role does it play in the Helium Flash? Which types of stars have a Helium flash and which do not? Explain why some stars do not have a Helium Flash? A helium flash is the explosive onset of He-to-C fusion (it is a core explosion that is actual ...
Picture: Alnitak is the left-hand star in Orion`s Belt. Image: NASA
... carbon/oxygen ratios that are typically four to five times higher than those of normal red giants and show little trace of the light metal oxide bands that are the usual red giant hallmark. They resemble S stars in their relative proportion of heavy and light metals, but contain far more carbon in t ...
... carbon/oxygen ratios that are typically four to five times higher than those of normal red giants and show little trace of the light metal oxide bands that are the usual red giant hallmark. They resemble S stars in their relative proportion of heavy and light metals, but contain far more carbon in t ...
HR Diagram
... It has been shown through observational data of many stars that the more massive a star, the more luminous it is. If you observe the H-R diagram on the cover of the lab, it is clear that there are fewer luminous stars as compared to the less luminous ones. In terms of the diagram, there are more sta ...
... It has been shown through observational data of many stars that the more massive a star, the more luminous it is. If you observe the H-R diagram on the cover of the lab, it is clear that there are fewer luminous stars as compared to the less luminous ones. In terms of the diagram, there are more sta ...
What is a Hertzsprung
... – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram – A star’s mass determines its position along the main sequence (high-mass: luminous and blue; low-mass: faint and red) ...
... – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram – A star’s mass determines its position along the main sequence (high-mass: luminous and blue; low-mass: faint and red) ...
Chapter 12 Stellar Evolution
... clearly populated. White dwarfs, indicating that solar-mass stars are in their last phases, also appear. ...
... clearly populated. White dwarfs, indicating that solar-mass stars are in their last phases, also appear. ...
13 The Family of Stars
... a pattern begins to form: These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence because this is where most stars are. The white dwarf region is also indicated; these stars are hot but not very luminous because they are qu ...
... a pattern begins to form: These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence because this is where most stars are. The white dwarf region is also indicated; these stars are hot but not very luminous because they are qu ...
1st Semester Earth Science Review 2014-15
... a. Neptune c. Uranus b. Jupiter d. Saturn ____ 100. The early atmosphere developed when many volcanic eruptions released large amounts of gases in a process called a. lava flow. c. combustion. b. outgassing. d. ozone. ____ 101. Which of the following planets has seasons like Earth’s because its axis ...
... a. Neptune c. Uranus b. Jupiter d. Saturn ____ 100. The early atmosphere developed when many volcanic eruptions released large amounts of gases in a process called a. lava flow. c. combustion. b. outgassing. d. ozone. ____ 101. Which of the following planets has seasons like Earth’s because its axis ...
society journal - Auckland Astronomical Society
... solar flare sends charged particles and radiation out into space. The Earth’s atmosphere and magnetic fields are usually adequate to protect us from these, but not completely during big events. The 1989 Montreal blackout, which was caused by solar activity, is the most recent example covered in this ...
... solar flare sends charged particles and radiation out into space. The Earth’s atmosphere and magnetic fields are usually adequate to protect us from these, but not completely during big events. The 1989 Montreal blackout, which was caused by solar activity, is the most recent example covered in this ...
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.