Word version - White dwarf stars and the Chandrasekhar limit
... and others. Sommerfeld left Chandra with some unpublished material of his, on the theory of electrons in metals. Chandra immediately launched into a study of the new material. In a few months Chandra had written a paper of his own, The Compton Scattering and the New Statistics. He felt that the pape ...
... and others. Sommerfeld left Chandra with some unpublished material of his, on the theory of electrons in metals. Chandra immediately launched into a study of the new material. In a few months Chandra had written a paper of his own, The Compton Scattering and the New Statistics. He felt that the pape ...
Betelgeuse: an unauthorized biography
... (i.e. main sequence) mass 15+2 –5 M, the 15 M corresponding (with mass loss rates from Schaller et al.) to about 13.7 M now. This mass, combined with a radius of 780, 700 or 640 R implies a surface gravity of log g = –0.20, –0.11 and –0.04 respectively, very much in line with the value 0.0 (with ...
... (i.e. main sequence) mass 15+2 –5 M, the 15 M corresponding (with mass loss rates from Schaller et al.) to about 13.7 M now. This mass, combined with a radius of 780, 700 or 640 R implies a surface gravity of log g = –0.20, –0.11 and –0.04 respectively, very much in line with the value 0.0 (with ...
129 DYNAMICAL STREAMS IN THE SOLAR NEIGHBOURHOOD B
... to the data, in order to make full use of all the available data (including less precise parallaxes) and to derive the properties of the different kinematic subgroups. Two such subgroups can be identified with the Hyades and Sirius superclusters. Stars belonging to them span a very wide range of age ...
... to the data, in order to make full use of all the available data (including less precise parallaxes) and to derive the properties of the different kinematic subgroups. Two such subgroups can be identified with the Hyades and Sirius superclusters. Stars belonging to them span a very wide range of age ...
Course Outline - Tony Bacigalupo
... Pulsations are due to internal instabilities Period is the time it takes to complete a cycle of bright to faint to bright ...
... Pulsations are due to internal instabilities Period is the time it takes to complete a cycle of bright to faint to bright ...
Are planetary systems flat?
... • orbital period P = 5.2 days • two curious features: • sinusoidal brightness variations at fundamental and first harmonic • transit (U shape) is shallower than occultation (square well) • both can be explained if the companion is a white dwarf rather than a planet: • occultation is deeper because t ...
... • orbital period P = 5.2 days • two curious features: • sinusoidal brightness variations at fundamental and first harmonic • transit (U shape) is shallower than occultation (square well) • both can be explained if the companion is a white dwarf rather than a planet: • occultation is deeper because t ...
Article PDF - IOPscience
... are created in order to provide an initial guess of the background. At the same time, the X, Y offsets between each image and a reference image (for G11 the image u9x6f001m_c0f in the HST archive, see http://archive.stsci.edu/) are measured using the IMEXAMINE task in IRAF. These offsets are input i ...
... are created in order to provide an initial guess of the background. At the same time, the X, Y offsets between each image and a reference image (for G11 the image u9x6f001m_c0f in the HST archive, see http://archive.stsci.edu/) are measured using the IMEXAMINE task in IRAF. These offsets are input i ...
PH607lec10-4gal2
... end, * is the normalization (# galaxies/Mpc3) This function is a power law for L< L* , but cuts off ...
... end, * is the normalization (# galaxies/Mpc3) This function is a power law for L< L* , but cuts off ...
Using Parallax to Measure the Distance of Stars
... One of the most difficult problems in astronomy is determining the distances to objects in the sky. There are four basic methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby ...
... One of the most difficult problems in astronomy is determining the distances to objects in the sky. There are four basic methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby ...
KS1 Education Guide - Immersive Theatres
... The Earth is the third planet from the Sun in a system that includes the Moon, the Sun, seven other planets and their moons, and smaller objects, such as asteroids and comets. The Sun, an average star, is the central and largest body in the Solar System. (5 – 8 Standard) ...
... The Earth is the third planet from the Sun in a system that includes the Moon, the Sun, seven other planets and their moons, and smaller objects, such as asteroids and comets. The Sun, an average star, is the central and largest body in the Solar System. (5 – 8 Standard) ...
Summary of dynamics of the regular heptagon: N =7
... D’s region spans 3 forward edges since it is step -3. This span is maximal for N = 7 so D has the largest possible measure. The development of S[1] and S[2] are similar, but complicated by the congestion of the ‘inner star’ region. In all cases the shear is the same, so the centers of these regions ...
... D’s region spans 3 forward edges since it is step -3. This span is maximal for N = 7 so D has the largest possible measure. The development of S[1] and S[2] are similar, but complicated by the congestion of the ‘inner star’ region. In all cases the shear is the same, so the centers of these regions ...
Harappan Astronomy
... hemispheres is different, with about 79% (above sea level) being in the Northern Hemisphere and only 21% is in the Southern Hemisphere. Land has a much lower specific heat compared to water and hence it heats up much faster for the same amount of heat received from the Sun. Hence the temperature of ...
... hemispheres is different, with about 79% (above sea level) being in the Northern Hemisphere and only 21% is in the Southern Hemisphere. Land has a much lower specific heat compared to water and hence it heats up much faster for the same amount of heat received from the Sun. Hence the temperature of ...
Chapter 12
... by which the star shifts is extremely small. It was not until the 1830s that the first parallax was measured by the German astronomer Friedrich Bessel at Königsberg Observatory (now in Kaliningrad). Even now, the method fails for most stars farther away than about 100 parsecs because the Earth’s atm ...
... by which the star shifts is extremely small. It was not until the 1830s that the first parallax was measured by the German astronomer Friedrich Bessel at Königsberg Observatory (now in Kaliningrad). Even now, the method fails for most stars farther away than about 100 parsecs because the Earth’s atm ...
Distance Measures: Parallax
... methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the ...
... methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the ...
The STIS CCD Spectroscopic Line Spread Functions
... and especially coronagraphic imagery done with the STIS CCD. Success of STIS is measurable in many ways. With each cycle of competition for HST observational time, many successful proposals use the STIS. Already, key discoveries include measurements of black hole masses in the nuclei of many galaxie ...
... and especially coronagraphic imagery done with the STIS CCD. Success of STIS is measurable in many ways. With each cycle of competition for HST observational time, many successful proposals use the STIS. Already, key discoveries include measurements of black hole masses in the nuclei of many galaxie ...
Distance Measures: Parallax
... methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the ...
... methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the ...
MASSIVE CLOSE BINARIES
... stars and, therefore, uncertainties in stellar evolution imply uncertainties in PNS. The mass transfer and the accretion process during Roche lobe overflow (RLOF) in a binary, the merger process and common envelope evolution have been discussed frequently in the ...
... stars and, therefore, uncertainties in stellar evolution imply uncertainties in PNS. The mass transfer and the accretion process during Roche lobe overflow (RLOF) in a binary, the merger process and common envelope evolution have been discussed frequently in the ...
A prevalence of dynamo-generated magnetic fields in the
... the core and could not cause mode suppression when the star evolves into a red giant. Turning to higher masses we see that, for a given νmax, stars above 1.4M" require increasingly strong magnetic fields to suppress their dipolar modes. From Fig. 4, there is no clear upper limit to the field strengt ...
... the core and could not cause mode suppression when the star evolves into a red giant. Turning to higher masses we see that, for a given νmax, stars above 1.4M" require increasingly strong magnetic fields to suppress their dipolar modes. From Fig. 4, there is no clear upper limit to the field strengt ...
Andromeda - Interactive Stars
... highly sensitive to the atmosphere around them, and can usually sense other people's feelings - and their motives - from an early age. This can be a mixed blessing for them, as they pick up on not only what is said, but also on all that is not said - or done. Every family - and society - of course, ...
... highly sensitive to the atmosphere around them, and can usually sense other people's feelings - and their motives - from an early age. This can be a mixed blessing for them, as they pick up on not only what is said, but also on all that is not said - or done. Every family - and society - of course, ...
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.