Astro-MilkyWay
... A Black Hole at the Center of Our Galaxy By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to ~ 2.6 million solar masses ...
... A Black Hole at the Center of Our Galaxy By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to ~ 2.6 million solar masses ...
Chapter 15
... A Black Hole at the Center of Our Galaxy By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to ~ 2.6 million solar masses ...
... A Black Hole at the Center of Our Galaxy By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to ~ 2.6 million solar masses ...
The Milky Way
... A Black Hole at the Center of Our Galaxy By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to ~ 3 million solar masses ...
... A Black Hole at the Center of Our Galaxy By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to ~ 3 million solar masses ...
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., ...
Document
... When astronomers look through their telescopes, they see billions of stars. What can they learn fromThe goal of this problem set is for you to understand that astronomers classify stars on the basis of two different criteria: (1) the intensity of one of the H absorption lines (called H), and (2) on ...
... When astronomers look through their telescopes, they see billions of stars. What can they learn fromThe goal of this problem set is for you to understand that astronomers classify stars on the basis of two different criteria: (1) the intensity of one of the H absorption lines (called H), and (2) on ...
The Swansong of Stars Orbiting Massive Black Holes
... are effective only when the star passes very close to the MBH. Inspiral starts when the star is scattered into a highly eccentric orbit, which brings it close to the MBH. Every orbit it dissipates some orbital energy. To dissipate all the energy and achieve tidal circularization (left panel) or beco ...
... are effective only when the star passes very close to the MBH. Inspiral starts when the star is scattered into a highly eccentric orbit, which brings it close to the MBH. Every orbit it dissipates some orbital energy. To dissipate all the energy and achieve tidal circularization (left panel) or beco ...
Powerpoint
... Stellar Masses Many stars are in binary pairs; measurement of their orbital motion allows determination of the masses of the stars. Orbits of visual binaries can be observed directly; Doppler shifts in spectroscopic binaries allow measurement of motion; and the period of eclipsing binaries can be m ...
... Stellar Masses Many stars are in binary pairs; measurement of their orbital motion allows determination of the masses of the stars. Orbits of visual binaries can be observed directly; Doppler shifts in spectroscopic binaries allow measurement of motion; and the period of eclipsing binaries can be m ...
Slide 1
... • In addition to “normal” stars, there are also red giants, red supergiants, blue giants, blue supergiants, red dwarfs, and white dwarfs • Luminosity class can distinguish giant star from main-sequence one in the same spectral class • If spectrum is measured, can find luminosity; combining this with ...
... • In addition to “normal” stars, there are also red giants, red supergiants, blue giants, blue supergiants, red dwarfs, and white dwarfs • Luminosity class can distinguish giant star from main-sequence one in the same spectral class • If spectrum is measured, can find luminosity; combining this with ...
17_LectureOutline
... • In addition to “normal” stars, there are also red giants, red supergiants, blue giants, blue supergiants, red dwarfs, and white dwarfs • Luminosity class can distinguish giant star from main-sequence one in the same spectral class • If spectrum is measured, can find luminosity; combining this with ...
... • In addition to “normal” stars, there are also red giants, red supergiants, blue giants, blue supergiants, red dwarfs, and white dwarfs • Luminosity class can distinguish giant star from main-sequence one in the same spectral class • If spectrum is measured, can find luminosity; combining this with ...
HR Diagram Activity
... On a clear night you have surely noticed that some stars are brighter than others. But stars also have different colors. Rigel is blue, and Betelgeuse is red. Capella and our Sun are yellow. In this activity you will make your own Hertzsprung-Russell diagram. You will see how star brightness, color, ...
... On a clear night you have surely noticed that some stars are brighter than others. But stars also have different colors. Rigel is blue, and Betelgeuse is red. Capella and our Sun are yellow. In this activity you will make your own Hertzsprung-Russell diagram. You will see how star brightness, color, ...
Astro 3 Spring, 2004 (Prof
... is called the turnoff point, and is where the main sequence stars are leaving for the red giant branch. If you see what spectral type of stars are leaving, and you know how long they are typically on the main sequence, you can thereby estimate the age o the cluster. Open Clusters are young, loosely ...
... is called the turnoff point, and is where the main sequence stars are leaving for the red giant branch. If you see what spectral type of stars are leaving, and you know how long they are typically on the main sequence, you can thereby estimate the age o the cluster. Open Clusters are young, loosely ...
Astronomy 103
... • How big are they? Mass and Size • How bright are they? • How do they shine? We know this already, at least for the Sun – are other stars the same? To tackle these questions, we must first know how far away they are. How do you measure the distances to the stars? ...
... • How big are they? Mass and Size • How bright are they? • How do they shine? We know this already, at least for the Sun – are other stars the same? To tackle these questions, we must first know how far away they are. How do you measure the distances to the stars? ...
Galactic Structure
... different elemental ratios than do field halo stars… Milky Way field stars ...
... different elemental ratios than do field halo stars… Milky Way field stars ...
d 2
... Earth = a grain of sand The Earth orbits the Sun at a distance of one meter Proxima Centauri lies 270 kilometers (170 miles) away Barnard’s Star lies 370 kilometers (230 miles) away Less than 100 stars lie within 1000 kilometers (600 miles) ...
... Earth = a grain of sand The Earth orbits the Sun at a distance of one meter Proxima Centauri lies 270 kilometers (170 miles) away Barnard’s Star lies 370 kilometers (230 miles) away Less than 100 stars lie within 1000 kilometers (600 miles) ...
CASPEC Observations of the Most Metal-Deficient Main
... known with emission exceeding this level. This is so striking that one may discriminate the Be from Ae stars. P Cygni type profiles are only seen in two very peculiar objects HD31648 and 41 51 1 . Moreover no [Fell] emission lines are reported for Ae stars. Similarly, N82 is probably not a premain s ...
... known with emission exceeding this level. This is so striking that one may discriminate the Be from Ae stars. P Cygni type profiles are only seen in two very peculiar objects HD31648 and 41 51 1 . Moreover no [Fell] emission lines are reported for Ae stars. Similarly, N82 is probably not a premain s ...
- EPJ Web of Conferences
... when the stars were forming, and the self-enrichment was being established. That was at very early times, as these dSph all host very old stars. That is, these dSph galaxies retain their original luminosity: they have not been significantly tidally stripped by passage through the Milky Way potential ...
... when the stars were forming, and the self-enrichment was being established. That was at very early times, as these dSph all host very old stars. That is, these dSph galaxies retain their original luminosity: they have not been significantly tidally stripped by passage through the Milky Way potential ...
charts_set_7
... Spectroscopic binaries are stars that orbit so closely, from Earth’s vantage point, that it requires a Doppler shift measurement to determine that there is more than a single star present. ...
... Spectroscopic binaries are stars that orbit so closely, from Earth’s vantage point, that it requires a Doppler shift measurement to determine that there is more than a single star present. ...
BV Color Index and Temperature - The University of Texas at Dallas
... • give a factor of 1.4 to 1.8 × variation in the resultant distance. • increases as the stellar distance increases only accurate enough to measure stellar distances of up to about 10 Mpc. • star has to be sufficiently bright to be able to measure the spectrum • can be obscured by matter between the ...
... • give a factor of 1.4 to 1.8 × variation in the resultant distance. • increases as the stellar distance increases only accurate enough to measure stellar distances of up to about 10 Mpc. • star has to be sufficiently bright to be able to measure the spectrum • can be obscured by matter between the ...
PHYS3380_102615_bw
... curve of our (and other) galaxy. It is then possible to use the plot of the rotation curve and the velocity to determine the distance to a certain point within the galaxy. ...
... curve of our (and other) galaxy. It is then possible to use the plot of the rotation curve and the velocity to determine the distance to a certain point within the galaxy. ...
Star Formation
... • Gravity can pull atoms and molecules together. • Concentrations equal to 1 million solar masses can form giant molecular clouds over 100 ly across. ...
... • Gravity can pull atoms and molecules together. • Concentrations equal to 1 million solar masses can form giant molecular clouds over 100 ly across. ...
Press release - ASTRONOMY GROUP – University of St Andrews
... Researcher Dr Alan Penny will use the brightness of half a dozen stars to refine estimates of how big the Universe actually is. Dr Penny hopes to solve the problem using the ‘extreme precision’ of NASA’s Kepler satellite launched into space last month. Developed for the search for new planets, Keple ...
... Researcher Dr Alan Penny will use the brightness of half a dozen stars to refine estimates of how big the Universe actually is. Dr Penny hopes to solve the problem using the ‘extreme precision’ of NASA’s Kepler satellite launched into space last month. Developed for the search for new planets, Keple ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.