PDF version - Caltech Astronomy
... page 29.) Tunneling to the rescue The prolific Gamow had another novel idea. In 1935, Let us now jump ahead to the 20th century and look at he postulated the existence of highly compact, massive what it took to arrive at today’s conception of the sources neutron cores at the centers of stars. Materi ...
... page 29.) Tunneling to the rescue The prolific Gamow had another novel idea. In 1935, Let us now jump ahead to the 20th century and look at he postulated the existence of highly compact, massive what it took to arrive at today’s conception of the sources neutron cores at the centers of stars. Materi ...
Abstract and Summary
... structure of components that are closely spaced in period. These multiplet structures are attributed to the phenomenon of rotational splitting, where formerly degenerate modes show their components due the breaking of spherical symmetry that occurs when rotation is considered. Period spacings betwee ...
... structure of components that are closely spaced in period. These multiplet structures are attributed to the phenomenon of rotational splitting, where formerly degenerate modes show their components due the breaking of spherical symmetry that occurs when rotation is considered. Period spacings betwee ...
How to interpret LPV in roAp stars Hiromoto Shibahashi , Don Kurtz
... They do not just go blue-to-red. ...
... They do not just go blue-to-red. ...
talk.wyse - Johns Hopkins University
... Either (i) determine mass profile from projected dispersion profile, with assumed isotropy, and smooth functional fit to the light profile Or (ii) assume a parameterised mass model M(r) and velocity dispersion anisotropy β(r) and fit dispersion profile to find best forms of these (for fixed light pr ...
... Either (i) determine mass profile from projected dispersion profile, with assumed isotropy, and smooth functional fit to the light profile Or (ii) assume a parameterised mass model M(r) and velocity dispersion anisotropy β(r) and fit dispersion profile to find best forms of these (for fixed light pr ...
View poster
... The solution is to start considering the Moon. Therefore the dynamic range of the star sensor had to include the brighter stars in our galaxy and the very bright Moon. Ranges from magnitudes 1 to -13 need to be covered. In the lab we have shown that the dynamic range of the star sensor can include t ...
... The solution is to start considering the Moon. Therefore the dynamic range of the star sensor had to include the brighter stars in our galaxy and the very bright Moon. Ranges from magnitudes 1 to -13 need to be covered. In the lab we have shown that the dynamic range of the star sensor can include t ...
Ch 13 Death of Stars(4-5?-13)
... • White Dwarfs: very dense, about mass of Sun in size of Earth. Atoms stop further collapse. M less than 1.4 solar masses • Neutron Stars: even denser, about mass of Sun in size of Orlando. Neutrons stop further collapse. M between 1.4 and 3 solar masses. Some neutron stars can be detected as pulsar ...
... • White Dwarfs: very dense, about mass of Sun in size of Earth. Atoms stop further collapse. M less than 1.4 solar masses • Neutron Stars: even denser, about mass of Sun in size of Orlando. Neutrons stop further collapse. M between 1.4 and 3 solar masses. Some neutron stars can be detected as pulsar ...
Ch. 13 Death of Stars(11-16-10)-3
... • White Dwarfs: very dense, about mass of Sun in size of Earth. Atoms stop further collapse. M less than 1.4 solar masses • Neutron Stars: even denser, about mass of Sun in size of Orlando. Neutrons stop further collapse. M between 1.4 and 3 solar masses. Some neutron stars can be detected as pulsar ...
... • White Dwarfs: very dense, about mass of Sun in size of Earth. Atoms stop further collapse. M less than 1.4 solar masses • Neutron Stars: even denser, about mass of Sun in size of Orlando. Neutrons stop further collapse. M between 1.4 and 3 solar masses. Some neutron stars can be detected as pulsar ...
Falling Stars
... speedy flight of light flash by, and you are left trying to describe what you saw and felt. You stare at the dark space, hoping another will streak across the sky. ...
... speedy flight of light flash by, and you are left trying to describe what you saw and felt. You stare at the dark space, hoping another will streak across the sky. ...
the magellanic clouds newsletter - Keele University Astrophysics
... Extant chemical evolution models underestimate the Galactic production of Sr, Y and Zr as well as the Solar System abundances of s-only isotopes with 90 < A < 130. To solve this problem, an additional (unknown) process has been invoked, the so-called LEPP (Light Element Primary Process). In this pap ...
... Extant chemical evolution models underestimate the Galactic production of Sr, Y and Zr as well as the Solar System abundances of s-only isotopes with 90 < A < 130. To solve this problem, an additional (unknown) process has been invoked, the so-called LEPP (Light Element Primary Process). In this pap ...
Understanding Stars
... more stars than group members, feel free to leave off any extra stars. The values for the Sun are given in the first row for reference. ...
... more stars than group members, feel free to leave off any extra stars. The values for the Sun are given in the first row for reference. ...
Measuring Our Universe
... by our ability to measure very small angles, and so to determine the distance to very far objects, we must use as long a baseline as possible. Astronomers realized that the longest possible baseline that could be used to measure astronomical distances is obtained by measuring positions of objects wh ...
... by our ability to measure very small angles, and so to determine the distance to very far objects, we must use as long a baseline as possible. Astronomers realized that the longest possible baseline that could be used to measure astronomical distances is obtained by measuring positions of objects wh ...
A Spectroscopic Survey of a Sample of Active M Dwarfs.
... all program and standard stars. Three well-observed M dwarfs were chosen as templates: HD36395 (Gliese 205), HD119850 (Gliese 526) and HD95735 (Gliese 411). Spectra of each of these stars taken 2001 Jan 3 were chosen because that night was exceptionally dry and cold (-16 C at the telescope secondary ...
... all program and standard stars. Three well-observed M dwarfs were chosen as templates: HD36395 (Gliese 205), HD119850 (Gliese 526) and HD95735 (Gliese 411). Spectra of each of these stars taken 2001 Jan 3 were chosen because that night was exceptionally dry and cold (-16 C at the telescope secondary ...
OLEARY_2004 - Armagh Observatory
... In order to use the telescope to time the eclipse of NN Ser, I used live sessions on the telescope to capture images of NN Ser during an eclipse. The Faulkes Telescope is equipped with a CCD camera. This contains a piece of silicon which detects light through the photoelectric effect, which causes i ...
... In order to use the telescope to time the eclipse of NN Ser, I used live sessions on the telescope to capture images of NN Ser during an eclipse. The Faulkes Telescope is equipped with a CCD camera. This contains a piece of silicon which detects light through the photoelectric effect, which causes i ...
OLEARY_2004_white
... In order to use these equations, the dates and times of the observations had to be converted to Julian days. Then an approximate value for n was found by rearranging the formula and using a time from my observations which was estimated to be in the middle of an eclipse. This value for n was then rou ...
... In order to use these equations, the dates and times of the observations had to be converted to Julian days. Then an approximate value for n was found by rearranging the formula and using a time from my observations which was estimated to be in the middle of an eclipse. This value for n was then rou ...
The Reflector: January 2010 - Peterborough Astronomical Association
... globular cluster. They’re almost as old as the universe itself. It’s also the finest in the Northern Hemisphere with nearly a million stars grouped into a ball 160 lightyears across. The dead stars known as Messier objects M57 and M27 will be putting in the last of their ghostly appearances for the ...
... globular cluster. They’re almost as old as the universe itself. It’s also the finest in the Northern Hemisphere with nearly a million stars grouped into a ball 160 lightyears across. The dead stars known as Messier objects M57 and M27 will be putting in the last of their ghostly appearances for the ...
Lecture 11
... Gamma Rays • In the 90s it was discovered that the sources were evenly distributed across the sky • Since then, the Bursts have been traced to massive explosions in distant galaxies ...
... Gamma Rays • In the 90s it was discovered that the sources were evenly distributed across the sky • Since then, the Bursts have been traced to massive explosions in distant galaxies ...
Part I Light, Telescopes, Atoms and Stars
... Photographic Plates were the standard… but now; CCD cameras • =Charge-Coupled Device (where we get modern video cameras ...
... Photographic Plates were the standard… but now; CCD cameras • =Charge-Coupled Device (where we get modern video cameras ...
Three Coordinate Systems
... Use same convention as for terrestrial longitude, with positive and negative angles. Prime meridian corresponds to 0o for SHA Same as SHA for 0o to 180o and (360o – SHA) for values of SHA from 180o to 360o Why? Easy to remember, and allows you to associate star coordinates with points on earth. Make ...
... Use same convention as for terrestrial longitude, with positive and negative angles. Prime meridian corresponds to 0o for SHA Same as SHA for 0o to 180o and (360o – SHA) for values of SHA from 180o to 360o Why? Easy to remember, and allows you to associate star coordinates with points on earth. Make ...
ASTR 1050: Survey of Astronomy
... 25. A main sequence type A star has about twice the surface temperature of our sun (a type G star). Assuming the stars are about the same physical size (i.e., same radius), how much more luminous is the type A star? a. Twice as luminous. b. Four times as luminous. c. Eight times as luminous. d. Sixt ...
... 25. A main sequence type A star has about twice the surface temperature of our sun (a type G star). Assuming the stars are about the same physical size (i.e., same radius), how much more luminous is the type A star? a. Twice as luminous. b. Four times as luminous. c. Eight times as luminous. d. Sixt ...
October 2014 - Newbury Astronomical Society
... a letter in sequence from ‘A’ through the alphabet. The original sequence was defined by the apparent age of the star. Later this sequence was found to be wrong. However the class letters for each kind of star were retained but now they are not in alphabetical order. A star like our Sun will spend a ...
... a letter in sequence from ‘A’ through the alphabet. The original sequence was defined by the apparent age of the star. Later this sequence was found to be wrong. However the class letters for each kind of star were retained but now they are not in alphabetical order. A star like our Sun will spend a ...
Three Coordinate Systems
... Use same convention as for terrestrial longitude, with positive and negative angles. Prime meridian corresponds to 0o for SHA Same as SHA for 0o to 180o and (360o – SHA) for values of SHA from 180o to 360o Why? Easy to remember, and allows you to associate star coordinates with points on earth. Make ...
... Use same convention as for terrestrial longitude, with positive and negative angles. Prime meridian corresponds to 0o for SHA Same as SHA for 0o to 180o and (360o – SHA) for values of SHA from 180o to 360o Why? Easy to remember, and allows you to associate star coordinates with points on earth. Make ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.