A seismic and gravitationally-bound double star observed by Kepler
... pair appears to also be gravitationally bound since they have the same parallax and proper motion (van Leeuwen 2007) but their relative motion observed between 1850 and 2007 does not allow one to derive a meaningful orbit. These binary systems are clearly resolved such that the time series of each c ...
... pair appears to also be gravitationally bound since they have the same parallax and proper motion (van Leeuwen 2007) but their relative motion observed between 1850 and 2007 does not allow one to derive a meaningful orbit. These binary systems are clearly resolved such that the time series of each c ...
Introduction
... (the lens) passes in front of a background source, this effect causes a magnification with a well known symmetrical light curve profile. If the star is orbited by a planet, it will also leave a signature on the light curve, which can even potentially serve to discover earth-sized planets (Bennett & ...
... (the lens) passes in front of a background source, this effect causes a magnification with a well known symmetrical light curve profile. If the star is orbited by a planet, it will also leave a signature on the light curve, which can even potentially serve to discover earth-sized planets (Bennett & ...
Lithium abundances along the red giant branch: FLAMES
... bump, which is expected from isochrones at 13.m 8 J0 14.m 1. Furthermore, we discarded all targets that had fewer than two quality flags “A” in the 2MASS JHK photometry and targets that had another source within 3 that was not fainter by at least 2.m 0 in the J-band than the target itself. Thi ...
... bump, which is expected from isochrones at 13.m 8 J0 14.m 1. Furthermore, we discarded all targets that had fewer than two quality flags “A” in the 2MASS JHK photometry and targets that had another source within 3 that was not fainter by at least 2.m 0 in the J-band than the target itself. Thi ...
Section2_Coordinates.. - Faculty Web Sites at the University of Virginia
... 1) The dynamical definition: - with respect to an ideal dynamical celestial reference frame, stars move so that they have no acceleration. The choice of this system is the Solar System as a whole. Stars in this system have positions determined with respect to observed positions of planets. Observati ...
... 1) The dynamical definition: - with respect to an ideal dynamical celestial reference frame, stars move so that they have no acceleration. The choice of this system is the Solar System as a whole. Stars in this system have positions determined with respect to observed positions of planets. Observati ...
Models of red giants in the CoRoT asteroseismology fields
... Solar reference values from M14 are Δν = 135.1 μHz, νmax, = 3090 μHz and T eff, = 5777 K. As the Hipparcos parallax, π, is available for most of the stars studied here, we can derive the stellar luminosity from the apparent magnitude in V-band, and then the stellar radius. The bolometric correctio ...
... Solar reference values from M14 are Δν = 135.1 μHz, νmax, = 3090 μHz and T eff, = 5777 K. As the Hipparcos parallax, π, is available for most of the stars studied here, we can derive the stellar luminosity from the apparent magnitude in V-band, and then the stellar radius. The bolometric correctio ...
Dark Matter In The 21st Century
... 3) The laws of physics are different in the Coma cluster than in our galaxy 4) The vast majority of the Coma cluster’s mass is in non-luminous material (dark matter) To discriminate between these various possibilities, it would be necessary to study other clusters and see if they too had large mass ...
... 3) The laws of physics are different in the Coma cluster than in our galaxy 4) The vast majority of the Coma cluster’s mass is in non-luminous material (dark matter) To discriminate between these various possibilities, it would be necessary to study other clusters and see if they too had large mass ...
Note - HKU Physics
... Thus, mass of a star is perhaps the most important parameter to determine the properties and evolution of that star within the same star cluster. It turns out that stars are not located randomly in the H-R diagram; they cluster around a few regions in the diagram instead. (See figure 1.1.) Besides, ...
... Thus, mass of a star is perhaps the most important parameter to determine the properties and evolution of that star within the same star cluster. It turns out that stars are not located randomly in the H-R diagram; they cluster around a few regions in the diagram instead. (See figure 1.1.) Besides, ...
Ch17_lecture
... – Black hole grows from accretion of interstellar matter – Radius of black hole increases making capture of more material easier – Eventually black hole becomes large enough to swallow entire stars – Growth of black hole is exponential until equilibrium with available materials stops growth ...
... – Black hole grows from accretion of interstellar matter – Radius of black hole increases making capture of more material easier – Eventually black hole becomes large enough to swallow entire stars – Growth of black hole is exponential until equilibrium with available materials stops growth ...
THE DAWN OF X-RAY ASTRONOMY
... outside the absorbing layers of the Earth’s atmosphere has made possible the observation of celestial objects in the x-ray range of wavelength. X-rays of energy greater than several hundreds of electron volts can penetrate the interstellar gas over distances comparable to the size of our own galaxy, ...
... outside the absorbing layers of the Earth’s atmosphere has made possible the observation of celestial objects in the x-ray range of wavelength. X-rays of energy greater than several hundreds of electron volts can penetrate the interstellar gas over distances comparable to the size of our own galaxy, ...
Chapter 17 Galaxies Galaxies Early Observations
... Measuring the Mass of Galaxies • The mass of a galaxy is determined from the modified form of Kepler’s third law • To use this method, one concentrates on some stars or gas on the outer fringes of the galaxy • The semimajor axis distance used in Kepler’s third law is simply half the galaxy’s pre-det ...
... Measuring the Mass of Galaxies • The mass of a galaxy is determined from the modified form of Kepler’s third law • To use this method, one concentrates on some stars or gas on the outer fringes of the galaxy • The semimajor axis distance used in Kepler’s third law is simply half the galaxy’s pre-det ...
Star Gauging (Star Counting)
... The consensus among meteor astronomers is that the particles of the new, 1990s peak were probably shed by Comet Swift-Tuttle during its swing by the Sun in 1862, and that as far as this rich filament of meteoroids is concerned, the show is over. But now, astronomers Esko Lyytinen of Finland and Tom ...
... The consensus among meteor astronomers is that the particles of the new, 1990s peak were probably shed by Comet Swift-Tuttle during its swing by the Sun in 1862, and that as far as this rich filament of meteoroids is concerned, the show is over. But now, astronomers Esko Lyytinen of Finland and Tom ...
The Big Bang and Stellar Evolution
... 3 - The particles would maintain the same vector (speed and direction) forever. Assuming the particles were moving outward through totally empty space, there is no way they could change direction. They could not get together and begin circling one another. 4 - There is no way to slow the particles. ...
... 3 - The particles would maintain the same vector (speed and direction) forever. Assuming the particles were moving outward through totally empty space, there is no way they could change direction. They could not get together and begin circling one another. 4 - There is no way to slow the particles. ...
The Milky Way Galaxy is Heading for a Major Cosmic Collision
... Milky Way Future • The Milky will merge with the Andromeda galaxy to become an elliptical galaxy – Their collision does not need to be as direct a hit as shown in the movie – They do always approach each other close enough to make a merger inevitable ...
... Milky Way Future • The Milky will merge with the Andromeda galaxy to become an elliptical galaxy – Their collision does not need to be as direct a hit as shown in the movie – They do always approach each other close enough to make a merger inevitable ...
Galaxies - University of Iowa Astrophysics
... • The Universe is expanding • This means that the Universe used to be smaller • In the early stages of the Universe galaxies were closer together, therefore, they interacted more • Since galaxies can merge, there were also more galaxies in the past ...
... • The Universe is expanding • This means that the Universe used to be smaller • In the early stages of the Universe galaxies were closer together, therefore, they interacted more • Since galaxies can merge, there were also more galaxies in the past ...
normal and active - FirstLight Astro
... ✴ only extremely recently (last century) have we figured out what these critters really are ✴ we see in Ch 13 that there are different types and their interactions can transform them ...
... ✴ only extremely recently (last century) have we figured out what these critters really are ✴ we see in Ch 13 that there are different types and their interactions can transform them ...
Observations and Theory of Dynamical Triggers for Star Formation
... Table 1. Young embedded or adjacent stars are connected with these globules, but it is uncertain whether this star formation was triggered by compression or was there before. For example, star formation could have occurred in the dense gas independently of the ionization and simply been exposed when ...
... Table 1. Young embedded or adjacent stars are connected with these globules, but it is uncertain whether this star formation was triggered by compression or was there before. For example, star formation could have occurred in the dense gas independently of the ionization and simply been exposed when ...
12 Stellar Evolution
... If the white dwarf’s mass exceeds 1.4 solar masses, electron degeneracy can no longer keep the core from collapsing. Carbon fusion begins throughout the star almost simultaneously, resulting in a carbon ...
... If the white dwarf’s mass exceeds 1.4 solar masses, electron degeneracy can no longer keep the core from collapsing. Carbon fusion begins throughout the star almost simultaneously, resulting in a carbon ...
Document
... • Recall Copernicus found relative distances of planets in solar system wrt Earth-Sun 1 AU. • Measure parallax of Earth-Sun, Earth-Planets etc • Observe from one side of Earth to other • 93 million miles=150 million km. ...
... • Recall Copernicus found relative distances of planets in solar system wrt Earth-Sun 1 AU. • Measure parallax of Earth-Sun, Earth-Planets etc • Observe from one side of Earth to other • 93 million miles=150 million km. ...
Apparent Motion of the Stars Worksheet
... State and draw the slant path of rising/setting stars along the eastern/western horizon as seen from any location. [Rule: The Celestial Equator (0° dec) intersects the horizon due East and West for all observers. All stars follow their respective lines of declination and, near the celestial equato ...
... State and draw the slant path of rising/setting stars along the eastern/western horizon as seen from any location. [Rule: The Celestial Equator (0° dec) intersects the horizon due East and West for all observers. All stars follow their respective lines of declination and, near the celestial equato ...
The DBV stars: Progress and problems
... with enough observations have significant amplitude variations with time for their main pulsation modes. If we accept the ordering of effective temperature given above, then the different amplitude variation behavior is probably telling something about mode selection. That is, as the partial ionizat ...
... with enough observations have significant amplitude variations with time for their main pulsation modes. If we accept the ordering of effective temperature given above, then the different amplitude variation behavior is probably telling something about mode selection. That is, as the partial ionizat ...
- newmanlib.ibri.org
... But the sun, etc. does not set vertically as far north as we are. Have to calculate the tilt of our horizon and such. If we take the horizon tilt to be zero at the equator and 90o at the north pole, then our tilt at a given latitude will be equal to that of the latitude, so at Phila, tilt = 40 deg. ...
... But the sun, etc. does not set vertically as far north as we are. Have to calculate the tilt of our horizon and such. If we take the horizon tilt to be zero at the equator and 90o at the north pole, then our tilt at a given latitude will be equal to that of the latitude, so at Phila, tilt = 40 deg. ...
Discovery of water vapor around IRC+10216 as evidence for comets
... surrounded by a Kuiper Belt analog. Objects orbiting in an analog of the Oort Cloud, however, would remain unaffected. Unfortunately, the detection of water vapor toward an evolved star does not unambiguously constitute evidence for the presence of Kuiper Belt-type objects. For those cases in which ...
... surrounded by a Kuiper Belt analog. Objects orbiting in an analog of the Oort Cloud, however, would remain unaffected. Unfortunately, the detection of water vapor toward an evolved star does not unambiguously constitute evidence for the presence of Kuiper Belt-type objects. For those cases in which ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.