Figueira, Pont, Mordasini, Alibert, Georgy, Benz
... The discovery by radial velocity surveys of close-in planets in the 4-20 Earth-mass range (e.g. Lovis et al. 2004, Udry et al. 2007, Mayor et al. 2008) has motivated the development of several sets of structure models of these planets (Valencia et al. 2007; Fortney et al. 2007; Seager et al. 2007). ...
... The discovery by radial velocity surveys of close-in planets in the 4-20 Earth-mass range (e.g. Lovis et al. 2004, Udry et al. 2007, Mayor et al. 2008) has motivated the development of several sets of structure models of these planets (Valencia et al. 2007; Fortney et al. 2007; Seager et al. 2007). ...
Coordinate Systems
... Pole to move in a circle around the sky, once every 26,000 years. Thuban was the pole star when the Great Pyramid was built in Egypt. ...
... Pole to move in a circle around the sky, once every 26,000 years. Thuban was the pole star when the Great Pyramid was built in Egypt. ...
Astronomy 112: The Physics of Stars Class 14 Notes: The Main
... The values compare reasonably well with the observed slopes of the lower and upper main sequence on the HR diagram. We can also explain other features of observed HR diagrams with this simple model. As we noted when we discussed star clusters of different ages, more massive, luminous stars leave the ...
... The values compare reasonably well with the observed slopes of the lower and upper main sequence on the HR diagram. We can also explain other features of observed HR diagrams with this simple model. As we noted when we discussed star clusters of different ages, more massive, luminous stars leave the ...
Xiao Yang Xia
... (2) Star formation rate and accretion rate onto the central BH in IR QSOs at low redshift follow Mbulge- MBH relation, i.e., the ratio of the star formation rate and the accretion rate is about several hundred for IR QSOs, but decreases with the central black hole mass. This shows that the tight cor ...
... (2) Star formation rate and accretion rate onto the central BH in IR QSOs at low redshift follow Mbulge- MBH relation, i.e., the ratio of the star formation rate and the accretion rate is about several hundred for IR QSOs, but decreases with the central black hole mass. This shows that the tight cor ...
History of Astronomy
... can we assign the author with certainty. Probably many of them were independently taken by Chinese, Indian, Persian, Tartar, Egyptian, Babylonian, Assyrian, Phoenician, and Greek astronomers. And we have not a particle of information about the discoveries, which may have been great, by other peoples ...
... can we assign the author with certainty. Probably many of them were independently taken by Chinese, Indian, Persian, Tartar, Egyptian, Babylonian, Assyrian, Phoenician, and Greek astronomers. And we have not a particle of information about the discoveries, which may have been great, by other peoples ...
Literature: The rotation of the Sun
... From this extraordinary sequence we have selected 12 images that show the move ment of a number of rather large groups. Several individual spots exceed the Earth in size! The photographs were also taken at a time when the Earth crossed the plane of the solar equator; thus, the spots appear to move ...
... From this extraordinary sequence we have selected 12 images that show the move ment of a number of rather large groups. Several individual spots exceed the Earth in size! The photographs were also taken at a time when the Earth crossed the plane of the solar equator; thus, the spots appear to move ...
Ch12&13 Life and Death of Stars
... • Things get interesting after about 9 billion years…. • A star remains on the main sequence as long as it can fuse hydrogen into helium in its core ...
... • Things get interesting after about 9 billion years…. • A star remains on the main sequence as long as it can fuse hydrogen into helium in its core ...
Review: How does a star`s mass determine its life story?
... Electron degeneracy pressure goes away because electrons combine with protons, making neutrons and neutrinos Neutrons collapse to the center, forming a neutron star ...
... Electron degeneracy pressure goes away because electrons combine with protons, making neutrons and neutrinos Neutrons collapse to the center, forming a neutron star ...
Worked Problem In a spherical galaxy, the density of matter varies
... and Tremaine for details). For a Kepler orbit, for instance, this ratio Tθ /Tr = 1, and the planet, travelling around the Sun, goes over and over the same elliptical orbit as a result. The ratio of the two periods Tθ /Tr is in general not a rational number, and so the typical orbit of a star in a sp ...
... and Tremaine for details). For a Kepler orbit, for instance, this ratio Tθ /Tr = 1, and the planet, travelling around the Sun, goes over and over the same elliptical orbit as a result. The ratio of the two periods Tθ /Tr is in general not a rational number, and so the typical orbit of a star in a sp ...
The Observable Universe: Redshift, Distances and the Hubble-Law
... • Most of galaxies and all Quasars have redshifted Spectra (cosmological redshift, not gravitational). • Hubble found: cz = H0 d , z < 0,1. • The Hubble Constant has to be calibrated: Cepheids and SN-Methods are nowadays the most important Distance Indicators: H0 = 72+/-5 km/s/Mpc. • Hubble-Law can ...
... • Most of galaxies and all Quasars have redshifted Spectra (cosmological redshift, not gravitational). • Hubble found: cz = H0 d , z < 0,1. • The Hubble Constant has to be calibrated: Cepheids and SN-Methods are nowadays the most important Distance Indicators: H0 = 72+/-5 km/s/Mpc. • Hubble-Law can ...
Life Cycle of a Star Lesson Plan
... The material in a white dwarf no longer undergoes fusion reactions, so the star has no source of energy, nor is it supported against gravitational collapse by the heat generated by fusion. It is supported only by electron degeneracy pressure, causing it to be extremely dense. The physics of degenera ...
... The material in a white dwarf no longer undergoes fusion reactions, so the star has no source of energy, nor is it supported against gravitational collapse by the heat generated by fusion. It is supported only by electron degeneracy pressure, causing it to be extremely dense. The physics of degenera ...
Detection of the Rossiter–McLaughlin effect in
... Eclipsing bodies on stars produce radial velocity variations on the photospheric stellar lines known as the Rossiter–McLaughlin (RM) effect. The body occults a small area of the stellar disc and, due to the rotation of the star, the stellar line profiles are distorted according to the projected loca ...
... Eclipsing bodies on stars produce radial velocity variations on the photospheric stellar lines known as the Rossiter–McLaughlin (RM) effect. The body occults a small area of the stellar disc and, due to the rotation of the star, the stellar line profiles are distorted according to the projected loca ...
Acceleration of Coronal Mass Ejection In Long Rising Solar
... The core collapses at the dynamic time scale, i.e. seconds For a core of 1.2 Ms contracting from a density of 109 cm-3 (degenerate electron state, Earth size) to 1015 cm-3 (neutron star, city size), it releases the gravitational energy in the order of 1053 ergs, comparable to the energy released by ...
... The core collapses at the dynamic time scale, i.e. seconds For a core of 1.2 Ms contracting from a density of 109 cm-3 (degenerate electron state, Earth size) to 1015 cm-3 (neutron star, city size), it releases the gravitational energy in the order of 1053 ergs, comparable to the energy released by ...
Records of Ketu in stone inscriptions
... we need to explore other possibilities, for example a long period variable or explosive star. Our search yielded one possible candidate as NGC 7662, which is an extensively studied planetary nebula. Guerrero et al. 14 identified two ellipsoidal shells in this nebula and the kinematic ages were deriv ...
... we need to explore other possibilities, for example a long period variable or explosive star. Our search yielded one possible candidate as NGC 7662, which is an extensively studied planetary nebula. Guerrero et al. 14 identified two ellipsoidal shells in this nebula and the kinematic ages were deriv ...
Continuous Spectrum Absorption Line Spectrum Emission Line
... for different stars and no two stars will be exactly the same. You should attempt to classify each spectrum by finding the standard spectrum(s) that most closely resembles the unknown spectrum. Look first at the overall shape and from this you should be able to roughly classify the spectra to within ...
... for different stars and no two stars will be exactly the same. You should attempt to classify each spectrum by finding the standard spectrum(s) that most closely resembles the unknown spectrum. Look first at the overall shape and from this you should be able to roughly classify the spectra to within ...
Stellar Properties
... • a star could be very bright because is was very close to us; not because it was truly bright • two stars in the same constellation might not be close to each other; one could be much farther away ...
... • a star could be very bright because is was very close to us; not because it was truly bright • two stars in the same constellation might not be close to each other; one could be much farther away ...
Lecture #9, June 19
... a particle from the earth's perspective. But the earth itself is not a particle-like object compared to the apple, so how can we treat it as such? This question bothered Newton too. Even though he guessed that this was acceptable to consider the interaction of the spherical Earth, with a particle-li ...
... a particle from the earth's perspective. But the earth itself is not a particle-like object compared to the apple, so how can we treat it as such? This question bothered Newton too. Even though he guessed that this was acceptable to consider the interaction of the spherical Earth, with a particle-li ...
Aquarius (constellation)
Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for ""water-carrier"" or ""cup-carrier"", and its symbol is 20px (Unicode ♒), a representation of water.Aquarius is one of the oldest of the recognized constellations along the zodiac (the sun's apparent path). It was one of the 48 constellations listed by the 2nd century AD astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.