ASTRONOMY 113 Modern Astronomy
... Earth orbits the Sun (revolves) once every year: • at an average distance of 1 AU ≈ 150 million km • with Earth’s axis tilted by 23.5º (pointing to Polaris) • and rotating in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
... Earth orbits the Sun (revolves) once every year: • at an average distance of 1 AU ≈ 150 million km • with Earth’s axis tilted by 23.5º (pointing to Polaris) • and rotating in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
Galaxies
... that our galaxy probably looked like the Andromeda galaxy, M31 and other spiral galaxies. M31 has become the most studied galaxy by astronomers over the years. In fact we probably know more about M31 than our own galaxy! ...
... that our galaxy probably looked like the Andromeda galaxy, M31 and other spiral galaxies. M31 has become the most studied galaxy by astronomers over the years. In fact we probably know more about M31 than our own galaxy! ...
No Slide Title
... What type of star has the mass of our Sun and the radius of the Earth but it doesn’t emit enough light or other radiation to be easily detected? ...
... What type of star has the mass of our Sun and the radius of the Earth but it doesn’t emit enough light or other radiation to be easily detected? ...
on the mass distribution of stars in the solar neighbourhood
... stars is and that a lot of future work is required for the purpose of answering this important question. In addition, the mean value for the total mass of a double star, of 1.6-1.7 M , found by Trajkovska and Ninković (1997) is also in a fair agreement with the present result for the mean star mas ...
... stars is and that a lot of future work is required for the purpose of answering this important question. In addition, the mean value for the total mass of a double star, of 1.6-1.7 M , found by Trajkovska and Ninković (1997) is also in a fair agreement with the present result for the mean star mas ...
Lecture8_2014_v2 - UCO/Lick Observatory
... • The worlds come into being as follows: many bodies of all sorts and shapes move from the infinite into a great void; they come together there and produce a single whirl, in which, colliding with one another and revolving in all manner of ways, they begin to separate like to like. ...
... • The worlds come into being as follows: many bodies of all sorts and shapes move from the infinite into a great void; they come together there and produce a single whirl, in which, colliding with one another and revolving in all manner of ways, they begin to separate like to like. ...
Chapter 13 Neutron Stars and Black Holes
... The first pulsar was discovered in 1967. It emitted extraordinarily regular pulses; nothing like it had ever been seen before. After some initial confusion, it was realized that this was a neutron star, spinning very rapidly. ...
... The first pulsar was discovered in 1967. It emitted extraordinarily regular pulses; nothing like it had ever been seen before. After some initial confusion, it was realized that this was a neutron star, spinning very rapidly. ...
The Physics of Massive Star Formation
... Start with McKee & Tan core: r –1.5, turbulent with vir ≈ 1, flat bottom ( const in center) Result: most mass goes into a single object ...
... Start with McKee & Tan core: r –1.5, turbulent with vir ≈ 1, flat bottom ( const in center) Result: most mass goes into a single object ...
X-Ray Binaries
... • neutron-star (black-hole) binaries with orbital periods of typically hours to less than a few days (for those ∼ 30 % with known periods) • the companion stars are “believed” to be low-mass objects: < 0.1 M¯) P < 1 hr: degenerate stars (M2 ∼ 3 hr < P < ∼ 10 hr: main-sequence stars P> ∼ 10 hr: subgi ...
... • neutron-star (black-hole) binaries with orbital periods of typically hours to less than a few days (for those ∼ 30 % with known periods) • the companion stars are “believed” to be low-mass objects: < 0.1 M¯) P < 1 hr: degenerate stars (M2 ∼ 3 hr < P < ∼ 10 hr: main-sequence stars P> ∼ 10 hr: subgi ...
Nucleosynthesis and the death of stars
... HUGE amounts (about 1038 neutrinos/s). Reason 2: Most neutrinos escape the Sun without interacting with the Sun’s matter, so they reach the Earth in 8 minutes ! They travel at very close to the speed of light. Reason 3: Neutrinos are produced by several reactions in the proton-proton chain and depen ...
... HUGE amounts (about 1038 neutrinos/s). Reason 2: Most neutrinos escape the Sun without interacting with the Sun’s matter, so they reach the Earth in 8 minutes ! They travel at very close to the speed of light. Reason 3: Neutrinos are produced by several reactions in the proton-proton chain and depen ...
X-ray Emission from Massive Stars
... Could we have been wrong about the lack of a magnetic dynamo - might massive star X-rays be similar to solar X-rays? Before we address this directly, we need to know about one very important property of massive stars (that might provide an alternate explanation for their X-rays)… ...
... Could we have been wrong about the lack of a magnetic dynamo - might massive star X-rays be similar to solar X-rays? Before we address this directly, we need to know about one very important property of massive stars (that might provide an alternate explanation for their X-rays)… ...
Small galaxies are growing smaller
... the Ursa Minor dwarf, with an absolute magnitude MV ≈ –8.3, though this is still somewhat uncertain. And IX was discovered as an excess in projected stellar density in the Sloan Digital Sky Survey (SDSS) data just 2.6° (a projected distance of 34 kpc) from the centre of M31. Allowing for the contrib ...
... the Ursa Minor dwarf, with an absolute magnitude MV ≈ –8.3, though this is still somewhat uncertain. And IX was discovered as an excess in projected stellar density in the Sloan Digital Sky Survey (SDSS) data just 2.6° (a projected distance of 34 kpc) from the centre of M31. Allowing for the contrib ...
Jeopardy - Mr. Morrow`s Class
... Stars do not move, but because Earth is rotating it looks like they move across the night sky from east to west. ...
... Stars do not move, but because Earth is rotating it looks like they move across the night sky from east to west. ...
Cygnus X-1
... Cygnus X-1 is one of the most likely candidates as being a black hole. Cygnus X-1 is about 14,000 light years away from earth. So this means that what we are seeing, is many, many, years old. It is a very inconsistent source for X-ray emissions. The emissions of X-rays for Cygnus X-1 flicker in hund ...
... Cygnus X-1 is one of the most likely candidates as being a black hole. Cygnus X-1 is about 14,000 light years away from earth. So this means that what we are seeing, is many, many, years old. It is a very inconsistent source for X-ray emissions. The emissions of X-rays for Cygnus X-1 flicker in hund ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.