Stars
... Before astronomers knew much about stars, they classified them based on the strength of observed absorption lines. Annie Jump Cannon ...
... Before astronomers knew much about stars, they classified them based on the strength of observed absorption lines. Annie Jump Cannon ...
Star Maps and Constellations
... chases the bears (Ursa Major, Ursa Minor) around in circles, i.e. keeps them at the North pole ...
... chases the bears (Ursa Major, Ursa Minor) around in circles, i.e. keeps them at the North pole ...
Binary Star Systems - d_smith.lhseducators.com
... • An eclipsing binary system is a special type of spectroscopic binary, where the orbit of the two stars is edge-on to our line of sight. • We periodically see one star pass in front of or eclipse the other star. When this happens the total amount of light that we receive from the pair dims for a fe ...
... • An eclipsing binary system is a special type of spectroscopic binary, where the orbit of the two stars is edge-on to our line of sight. • We periodically see one star pass in front of or eclipse the other star. When this happens the total amount of light that we receive from the pair dims for a fe ...
1. If a star`s temperature is doubled but radius is kept constant, by
... 8. Which of the above two objects looks redder and why? 8a. The cooler object looks redder because it emits more of its enery at those shorter wavelengths. 9. What is the main physical quantity that explains spectral type? 9a. Temperature. 10. True or False: the largest telescope on Earth can take a ...
... 8. Which of the above two objects looks redder and why? 8a. The cooler object looks redder because it emits more of its enery at those shorter wavelengths. 9. What is the main physical quantity that explains spectral type? 9a. Temperature. 10. True or False: the largest telescope on Earth can take a ...
Epsilon Aurigae Mystery and Opportunity
... began "regular" observing once every few years around 1842-1843, and the data from both men showed that the star became significantly fainter around 1847. • Observers later in the 19th Century recorded another dimming event in 1874-1875, and another in 19011902. ...
... began "regular" observing once every few years around 1842-1843, and the data from both men showed that the star became significantly fainter around 1847. • Observers later in the 19th Century recorded another dimming event in 1874-1875, and another in 19011902. ...
Constellations - Brown University Wiki
... seven sisters, a cluster of six bright stars ( about 200 in a telescope) known all over the world but now counted as part of the larger group called the constellation Taurus (the Bull) and the asterism “the Big Dipper”, the seven brightest stars in the larger group called Ursa Major (the Big Bear). ...
... seven sisters, a cluster of six bright stars ( about 200 in a telescope) known all over the world but now counted as part of the larger group called the constellation Taurus (the Bull) and the asterism “the Big Dipper”, the seven brightest stars in the larger group called Ursa Major (the Big Bear). ...
star
... or black hole). These pairs of stars produce X-rays if the stars are close enough together that material is pulled off the normal star by the gravity of the dense, collapsed star. The X-rays come from the area around the collapsed star where the material that is falling toward it is heated to very h ...
... or black hole). These pairs of stars produce X-rays if the stars are close enough together that material is pulled off the normal star by the gravity of the dense, collapsed star. The X-rays come from the area around the collapsed star where the material that is falling toward it is heated to very h ...
Stellar Luminosity
... Stellar Luminosities • Stellar luminosities vary from 0.0001 L¤–1,000,000 L¤, ten orders of magnitude • Note that most of the stars in this image are at the same distance, so their relative apparent brightness is the same as their relative l ...
... Stellar Luminosities • Stellar luminosities vary from 0.0001 L¤–1,000,000 L¤, ten orders of magnitude • Note that most of the stars in this image are at the same distance, so their relative apparent brightness is the same as their relative l ...
Stars: radius and mass
... • If we know luminosity and temperature, then we can find the radius: L = 4R2T4 • Small stars will have low luminosities unless they are very hot. • Stars with low surface temperatures must be very large in order to have large luminosities. ...
... • If we know luminosity and temperature, then we can find the radius: L = 4R2T4 • Small stars will have low luminosities unless they are very hot. • Stars with low surface temperatures must be very large in order to have large luminosities. ...
Figure 10-6 The same star field shown in Figure
... stars, however. When the magnitude scale was extended and expressed by a mathematical formula, it developed that the brighter stars are brighter than those of the first magnitude; indeed they are even brighter than those of zero magnitude. The only way to express these hitherto unsuspected magnitude ...
... stars, however. When the magnitude scale was extended and expressed by a mathematical formula, it developed that the brighter stars are brighter than those of the first magnitude; indeed they are even brighter than those of zero magnitude. The only way to express these hitherto unsuspected magnitude ...
PowerPoint Presentation - ASTR498E High energy
... The area under consideration must be oriented face-on to lineof-sight to the star In principle, this definition works for any kind of energy emitted by the star… most commonly, we mean e/m radiation Sometimes, it is useful to consider the observed flux in a restricted range of e/m wavelengths (e.g., ...
... The area under consideration must be oriented face-on to lineof-sight to the star In principle, this definition works for any kind of energy emitted by the star… most commonly, we mean e/m radiation Sometimes, it is useful to consider the observed flux in a restricted range of e/m wavelengths (e.g., ...
HR DIAGRAM ACTIVITY
... You can check your HR diagram at: http://deskarati.com/wp-content/uploads/2012/03/HertzsprungRussell-Diagram.jpg 1. Draw a circle around all the red giants on your graph and label this enclosed area Red Giants. 2. Draw a circle around all the white dwarfs and label this enclosed area White Dwarfs. 3 ...
... You can check your HR diagram at: http://deskarati.com/wp-content/uploads/2012/03/HertzsprungRussell-Diagram.jpg 1. Draw a circle around all the red giants on your graph and label this enclosed area Red Giants. 2. Draw a circle around all the white dwarfs and label this enclosed area White Dwarfs. 3 ...
Lecture 11
... Sun can only run 30million years on gravity. It does this during formation Best understanding of Sun until Einstein. ...
... Sun can only run 30million years on gravity. It does this during formation Best understanding of Sun until Einstein. ...
Binary Orbits
... One star goes behind the other A. The two stars are sufficiently close B. One is large enough to block the other C. The inclination angle is close to 90 Stars are so close that thay cannot be distinguished, but detected due to reduction of light. ...
... One star goes behind the other A. The two stars are sufficiently close B. One is large enough to block the other C. The inclination angle is close to 90 Stars are so close that thay cannot be distinguished, but detected due to reduction of light. ...
09astrophysics_2007Nov
... 2a. Solving the System •“Spectroscopic Binaries” are so close together you only see one star, but we can see the spectral lines split and converge as the starts orbit. ...
... 2a. Solving the System •“Spectroscopic Binaries” are so close together you only see one star, but we can see the spectral lines split and converge as the starts orbit. ...
Our Star - the Sun
... Some binaries can be detected and analyzed, even though the system may be so distant or the two stars so close together that the two star images cannot be resolved A spectrum binary appears to be a single star but has a spectrum with the absorption lines for two distinctly different spectral types A ...
... Some binaries can be detected and analyzed, even though the system may be so distant or the two stars so close together that the two star images cannot be resolved A spectrum binary appears to be a single star but has a spectrum with the absorption lines for two distinctly different spectral types A ...
Astronomy 110 Announcements: 11.1 Properties of Stars
... • Oh, Be A Fine Guy, Kiss Me Spectral types are further broken down to sub-classes by numbers from 0 to 9 (hotter to cooler) Lines in a star’s spectrum correspond to a spectral type that reveals its temperature ...
... • Oh, Be A Fine Guy, Kiss Me Spectral types are further broken down to sub-classes by numbers from 0 to 9 (hotter to cooler) Lines in a star’s spectrum correspond to a spectral type that reveals its temperature ...
ASTRONOMY
... 21. Where would you place Lynx in relationship to Gemini’s position? 22. What unique feature is found in Camelopardalis 23. What two prominent constellations are found in the southern skies? 24. To which part of the sky would you turn to find Pegasus? 25. Where was the first planet outside our solar ...
... 21. Where would you place Lynx in relationship to Gemini’s position? 22. What unique feature is found in Camelopardalis 23. What two prominent constellations are found in the southern skies? 24. To which part of the sky would you turn to find Pegasus? 25. Where was the first planet outside our solar ...
Lecture10
... To determine stellar mases we rely on binary star systems. As seen from Earth, the two stars that make up this binary system are separated by less than 1/3 arcsecond. For simplicity, the diagram shows one star as remaining stationary; in reality, both stars move around their common center of mass ...
... To determine stellar mases we rely on binary star systems. As seen from Earth, the two stars that make up this binary system are separated by less than 1/3 arcsecond. For simplicity, the diagram shows one star as remaining stationary; in reality, both stars move around their common center of mass ...
Powerpoint Presentation (large file)
... • Cepheid variables are high-mass pulsating variables • RR Lyrae variables are low-mass, metal-poor pulsating variables with short periods • Long-period variable stars also pulsate but in a fashion that is less well understood ...
... • Cepheid variables are high-mass pulsating variables • RR Lyrae variables are low-mass, metal-poor pulsating variables with short periods • Long-period variable stars also pulsate but in a fashion that is less well understood ...
Star Types
... The H-R diagram “The stars are distant and unobtrusive, but bright and enduring as our fairest and most ...
... The H-R diagram “The stars are distant and unobtrusive, but bright and enduring as our fairest and most ...
Lab Document - University of Iowa Astronomy and Astrophysics
... (8) Now let’s try and find a “Deep Sky” object using the Pocket Sky Atlas. We will look at the object M13 in the constellation of Hercules. Using the Star Wheel and SC1 chart, find Hercules. Both the Star Wheel and the SC1 indicate where M13 is located. The Pocket Sky Atlas has a more detailed map o ...
... (8) Now let’s try and find a “Deep Sky” object using the Pocket Sky Atlas. We will look at the object M13 in the constellation of Hercules. Using the Star Wheel and SC1 chart, find Hercules. Both the Star Wheel and the SC1 indicate where M13 is located. The Pocket Sky Atlas has a more detailed map o ...
The Northern sky - Visit Isle of Man
... Isle of Man’s dark sky locations? The Northern sky Looking North towards Scotland and Ireland, spectacular views of the Northern sky can be seen from Smeale, Niarbyl, Ramsey, Peel and the Northern parts of the Island. The well known asterism of the Plough can be seen astride the horizon in autumn, a ...
... Isle of Man’s dark sky locations? The Northern sky Looking North towards Scotland and Ireland, spectacular views of the Northern sky can be seen from Smeale, Niarbyl, Ramsey, Peel and the Northern parts of the Island. The well known asterism of the Plough can be seen astride the horizon in autumn, a ...
Capella
Capella is the brightest star in the constellation Auriga, the sixth brightest in the night sky and the third brightest in the northern celestial hemisphere, after Arcturus and Vega. Its name is derived from the diminutive of the Latin capra ""goat"", hence ""little goat"". Capella also bears the Bayer designation Alpha Aurigae (often abbreviated to α Aurigae, α Aur or Alpha Aur). Although it appears to be a single star to the naked eye, it is actually a star system of four stars in two binary pairs. The first pair consists of two bright, large type-G giant stars, both with a radius around 10 times that of the Sun and two and a half times its mass, in close orbit around each other. Designated Capella Aa and Capella Ab, these two stars have both exhausted their core hydrogen fuel and become giant stars, though it is unclear exactly what stage they are on the stellar evolutionary pathway. The second pair, around 10,000 astronomical units from the first, consists of two faint, small and relatively cool red dwarfs. They are designated Capella H and Capella L. The stars labelled Capella C through to G and I through to K are actually unrelated stars in the same visual field. The Capella system is relatively close, at only 42.8 light-years (13.1 pc) from Earth.