Ch. 15 Notes
... – Easily identifiable by the three stars of his belt during the fall and winter – Betelgeuse, the hunter’s right shoulder, is a red supergiant star. If it was in our sun’s place it would extend to the orbit of Jupiter. It will explode in a supernova explosion sometime in the next 1000 years. When th ...
... – Easily identifiable by the three stars of his belt during the fall and winter – Betelgeuse, the hunter’s right shoulder, is a red supergiant star. If it was in our sun’s place it would extend to the orbit of Jupiter. It will explode in a supernova explosion sometime in the next 1000 years. When th ...
Word doc - UC
... constellation Cygnus, monitoring their brightness photometrically every 30 minutes for four years. It was searching for any minute decreases in brightness that might indicate one or more planets transiting (passing in front of) their host star as seen from Earth. (For comparison, if Earth transited ...
... constellation Cygnus, monitoring their brightness photometrically every 30 minutes for four years. It was searching for any minute decreases in brightness that might indicate one or more planets transiting (passing in front of) their host star as seen from Earth. (For comparison, if Earth transited ...
Lecture 17, PPT version
... In 1974, Jocelyn’s PhD advisor (Tony Hewish) got the Nobel Prize for explaining what puslars are Now know of 100’s of pulsars, most with periods between 0.03 and 0.3 seconds (meaning they rotate between 3 and 30 times per seconds) The fastest known pulsars have periods of milliseconds and are rotati ...
... In 1974, Jocelyn’s PhD advisor (Tony Hewish) got the Nobel Prize for explaining what puslars are Now know of 100’s of pulsars, most with periods between 0.03 and 0.3 seconds (meaning they rotate between 3 and 30 times per seconds) The fastest known pulsars have periods of milliseconds and are rotati ...
Stars and Galaxies
... can get a glimpse of it. Every time we look at the Moon, for example, we see it as it was a little more than a second ago. That’s because sunlight reflected from the Moon’s surface takes a little more than a second to reach Earth. We see the Sun as it looked about eight minutes ago, and the other st ...
... can get a glimpse of it. Every time we look at the Moon, for example, we see it as it was a little more than a second ago. That’s because sunlight reflected from the Moon’s surface takes a little more than a second to reach Earth. We see the Sun as it looked about eight minutes ago, and the other st ...
Slide 1
... approximately the same age! More massive stars evolve more quickly than less massive ones. ...
... approximately the same age! More massive stars evolve more quickly than less massive ones. ...
Document
... moving apart so rapidly that their gravitational attraction for one another cannot pull them into orbit about one another ...
... moving apart so rapidly that their gravitational attraction for one another cannot pull them into orbit about one another ...
Distances farther out
... continuum and bulk of absorption lines form). Chromospheres detected by high resolution spectroscopy of strongest lines. Eg. Fraunhofer H & K lines of Ca II (H line of Ca II is blended with a hydrogen line so the K Ca II line is better). Self - reversed / Self - absorbed emission feature (nested spe ...
... continuum and bulk of absorption lines form). Chromospheres detected by high resolution spectroscopy of strongest lines. Eg. Fraunhofer H & K lines of Ca II (H line of Ca II is blended with a hydrogen line so the K Ca II line is better). Self - reversed / Self - absorbed emission feature (nested spe ...
Stars: from Adolescence to Old Age
... The core now contains only carbon and oxygen At this stage, a star similar in mass to the Sun has exhausted its inner resources and will soon begin to die The star’s luminosity may pulsate for a time due to its pressure and gravity being out of sync 4 August 2005 ...
... The core now contains only carbon and oxygen At this stage, a star similar in mass to the Sun has exhausted its inner resources and will soon begin to die The star’s luminosity may pulsate for a time due to its pressure and gravity being out of sync 4 August 2005 ...
lecture22
... This fusion takes place at very high temperatures and the new thermal pressure causes the outer layers to expand into a giant star. Both the cooling/collapsing inert He core and the H-burning shell contributes to energy output. Star overproduces energy: it expands, surface cools, and becomes a lumin ...
... This fusion takes place at very high temperatures and the new thermal pressure causes the outer layers to expand into a giant star. Both the cooling/collapsing inert He core and the H-burning shell contributes to energy output. Star overproduces energy: it expands, surface cools, and becomes a lumin ...
Formation of the Solar System
... The massive star is closer to center of mass, and moves more slowly than the planet, but it does move! Example: ignore planets other than Jupiter. Then Sun and Jupiter orbit their common center of mass every 11.86 years. Jupiter’s orbit has semi-major axis of 7.78 x 108 km, while Sun’s semi-major a ...
... The massive star is closer to center of mass, and moves more slowly than the planet, but it does move! Example: ignore planets other than Jupiter. Then Sun and Jupiter orbit their common center of mass every 11.86 years. Jupiter’s orbit has semi-major axis of 7.78 x 108 km, while Sun’s semi-major a ...
Stellar Physics Lecture 1
... The H-R Diagram – Other regions to note are stars of high luminosity but low temperature (indicating they are large – hence the term red giant) and stars of high temperature but low luminosity (indicating small diameters, hence white dwarf ) – As we shall see, the H-R diagram is extremely useful in ...
... The H-R Diagram – Other regions to note are stars of high luminosity but low temperature (indicating they are large – hence the term red giant) and stars of high temperature but low luminosity (indicating small diameters, hence white dwarf ) – As we shall see, the H-R diagram is extremely useful in ...
Circumstellar Zones
... Open the Circumstellar Zone Simulator. There are four main panels: The top panel simulation displays a visualization of a star and its planets looking down onto the plane of the solar system. The habitable zone is displayed for the particular star being simulated. One can click and drag either tow ...
... Open the Circumstellar Zone Simulator. There are four main panels: The top panel simulation displays a visualization of a star and its planets looking down onto the plane of the solar system. The habitable zone is displayed for the particular star being simulated. One can click and drag either tow ...
Unit 4: Astronomy
... 1) Describe how astronomers were first able to measure the distances to stars. 2) Describe the unit of the length developed by astronomers to measure and describe distances to stars other than our own sun. 3) Explain the statement “looking deep into space is essentially looking back in time”. 4) Des ...
... 1) Describe how astronomers were first able to measure the distances to stars. 2) Describe the unit of the length developed by astronomers to measure and describe distances to stars other than our own sun. 3) Explain the statement “looking deep into space is essentially looking back in time”. 4) Des ...
MS Word version
... The following sequence of directions are steps an instructor might choose to follow in demonstrating the Eclipsing Binary Simulator in a classroom situation. We provide these suggestions with appropriate questions (shown in bold italics) to pose to the class as an aid in promoting interactivity. We ...
... The following sequence of directions are steps an instructor might choose to follow in demonstrating the Eclipsing Binary Simulator in a classroom situation. We provide these suggestions with appropriate questions (shown in bold italics) to pose to the class as an aid in promoting interactivity. We ...
Star Formation: Interstellar Gas and Dust
... What types of planets are out there? • Current search methods Î easiest to detect giant planets close to parent star. • But…why do giant planets exist at less than 1 AU? – spiraling into the star, as a result of friction. ...
... What types of planets are out there? • Current search methods Î easiest to detect giant planets close to parent star. • But…why do giant planets exist at less than 1 AU? – spiraling into the star, as a result of friction. ...
Star Formation
... Open Cluster: Group of ~hundreds youngish stars formed at same time from same molecular cloud - Association-tens of young stars not gravitationally bound together ...
... Open Cluster: Group of ~hundreds youngish stars formed at same time from same molecular cloud - Association-tens of young stars not gravitationally bound together ...
Measuring Stellar Distances
... - 1.0 arc seconds which is not sufficient to measure good parallaxes to many nearby stars. Even the closest star to the Earth (Proxima Centauri) has a parallax less than 1 arcsecond. A star at a distance of 20 parsecs from the sun would exhibit a parallactic angle of only 0.05 seconds or arc, approx ...
... - 1.0 arc seconds which is not sufficient to measure good parallaxes to many nearby stars. Even the closest star to the Earth (Proxima Centauri) has a parallax less than 1 arcsecond. A star at a distance of 20 parsecs from the sun would exhibit a parallactic angle of only 0.05 seconds or arc, approx ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.