The Official Magazine of the University Of St Andrews Astronomical Society 1
... parent star, with orbital periods of only a few days. Our gas giants, however, are orders of magnitude more distant from the sun than typical exoplanets are from their stars. Why is our Solar system so different to – what appears to be – the Galactic norm? In recent years, astronomers have come clos ...
... parent star, with orbital periods of only a few days. Our gas giants, however, are orders of magnitude more distant from the sun than typical exoplanets are from their stars. Why is our Solar system so different to – what appears to be – the Galactic norm? In recent years, astronomers have come clos ...
AUGUSTE COMTE`S BLUNDER: AN ACCOUNT OF THE FIRST
... 1863). Less than three decades after Comte made his assertion, it was already shown to be incorrect, at least for the Sun. But the results for the solar spectrum were no more than qualitative and there was no theoretical understanding of how the absorption lines were formed. ...
... 1863). Less than three decades after Comte made his assertion, it was already shown to be incorrect, at least for the Sun. But the results for the solar spectrum were no more than qualitative and there was no theoretical understanding of how the absorption lines were formed. ...
Estimating Eccentricity of Planetary and Stellar Cores
... Magnetic field and pole reversals. The origin of Earth’s magnetic field remains one of the most important unexplained mysteries in planetary science. There is also no plausible explanation for magnetic pole reversals that are so well recorded in the magnetized mineral deposits around the globe [6]. ...
... Magnetic field and pole reversals. The origin of Earth’s magnetic field remains one of the most important unexplained mysteries in planetary science. There is also no plausible explanation for magnetic pole reversals that are so well recorded in the magnetized mineral deposits around the globe [6]. ...
Age-Dating of Young Stars and Stellar Systems
... in spectral classification and in evolution models. Note that in addition to this effect, the long-standing discrepancy between observed and theoretical blue-tored supergiant ratios is still unresolved (Langer & Maeder 1995). Schaerer et al. (1993) and Fagotto et al. (1994) computed evolution models ...
... in spectral classification and in evolution models. Note that in addition to this effect, the long-standing discrepancy between observed and theoretical blue-tored supergiant ratios is still unresolved (Langer & Maeder 1995). Schaerer et al. (1993) and Fagotto et al. (1994) computed evolution models ...
Chemical abundances and winds of massive stars in M31: a Btype
... B- and A-type supergiants in Local Group galaxies with welldefined distances will, therefore, allow us to test the concept of the WLR and its applicability for distance determinations. Numerous surveys have identified OB and WR stars beyond the Magellanic Clouds, e.g. Massey et al. (1986) and Moffat ...
... B- and A-type supergiants in Local Group galaxies with welldefined distances will, therefore, allow us to test the concept of the WLR and its applicability for distance determinations. Numerous surveys have identified OB and WR stars beyond the Magellanic Clouds, e.g. Massey et al. (1986) and Moffat ...
Strongly Interacting Supernovae - The National Centre for Radio
... No indication of reverse shock emission RS moved back to centre and weakened. RS is a cooking shock and the cool shell absorbing this. ...
... No indication of reverse shock emission RS moved back to centre and weakened. RS is a cooking shock and the cool shell absorbing this. ...
Stars Evolution of High Mass Stars Nucleosynthesis Supernovae
... • A star’s mass determines its entire life story because it determines its core temperature. • High-mass stars have short lives, eventually becoming hot enough to make iron, and end in ...
... • A star’s mass determines its entire life story because it determines its core temperature. • High-mass stars have short lives, eventually becoming hot enough to make iron, and end in ...
Solutions to exercises
... Figure S1.1a. The minimum value of the radial velocity corresponds to sin i = 0, which occurs when i = 0◦ ; this corresponds to the plane of the orbit coinciding with the plane of the sky as viewed by the observer, as shown in Figure S1.1b. The orbital velocities of the star and its planet are alway ...
... Figure S1.1a. The minimum value of the radial velocity corresponds to sin i = 0, which occurs when i = 0◦ ; this corresponds to the plane of the orbit coinciding with the plane of the sky as viewed by the observer, as shown in Figure S1.1b. The orbital velocities of the star and its planet are alway ...
1 A Re-appraisal of the Habitability of Planets Around M Dwarf Stars
... as its power source. These same named luminosity classes are also numbered for abbreviation; I, II, III, IV, V runs from Supergiant to dwarf. Our own Sun is spectral type G2 and luminosity class V (or dwarf). Less massive dwarf stars are cool, such as M dwarfs. The length of time a particular star r ...
... as its power source. These same named luminosity classes are also numbered for abbreviation; I, II, III, IV, V runs from Supergiant to dwarf. Our own Sun is spectral type G2 and luminosity class V (or dwarf). Less massive dwarf stars are cool, such as M dwarfs. The length of time a particular star r ...
The Antares Emission Nebula and Mass Loss of α Sco A
... lines, but no [O II] and [O III]. The reason for the non-visibility of [O II] is the low electron temperature of 4 900 K, while [N II] is seen because the nitrogen abundance is enhanced by a factor of three due to the CNO cycle. We derive a mass-loss rate of 1.05 ± 0.3 × 10 –6 M /yr for the M superg ...
... lines, but no [O II] and [O III]. The reason for the non-visibility of [O II] is the low electron temperature of 4 900 K, while [N II] is seen because the nitrogen abundance is enhanced by a factor of three due to the CNO cycle. We derive a mass-loss rate of 1.05 ± 0.3 × 10 –6 M /yr for the M superg ...
BRC_prop1 - CoolWiki
... spectrum. They will compare images obtained by IRAC, MIPS and IRAS to learn about spatial resolution. Evidence will be presented to help students understand how the universe is changing, how stars and planets are forming, and how stars evolve from birth to eventual death. Combining images at differe ...
... spectrum. They will compare images obtained by IRAC, MIPS and IRAS to learn about spatial resolution. Evidence will be presented to help students understand how the universe is changing, how stars and planets are forming, and how stars evolve from birth to eventual death. Combining images at differe ...
Star Map - Science Centre
... Located towards the South East of Orion’s belt is the brightest star in the sky, Sirius (scorching), belonging to the constellation Canis Major. Its brightness causes it to twinkle more than other stars as its light passes through our atmosphere. ...
... Located towards the South East of Orion’s belt is the brightest star in the sky, Sirius (scorching), belonging to the constellation Canis Major. Its brightness causes it to twinkle more than other stars as its light passes through our atmosphere. ...
A Star*s Color, Temperature, and Brightness are Related!
... Red & Orange star come in 2 varieties: giants & dwarfs. The spectrum of the star must be used to determine if the star is large or small. The presence of what element(s) in higher than normal percentages might indicate that the star is a giant, not a dwarf? ...
... Red & Orange star come in 2 varieties: giants & dwarfs. The spectrum of the star must be used to determine if the star is large or small. The presence of what element(s) in higher than normal percentages might indicate that the star is a giant, not a dwarf? ...
Dormant black holes turn into ravenous beasts when stars wake
... outburst as it brightened to a peak a month later before fading away over the following year. This time, we were able to model the light curve using tidal disruption simulations; we estimated a mass of 2 million Suns for the central black hole. More surprising was the nature of the star it had capt ...
... outburst as it brightened to a peak a month later before fading away over the following year. This time, we were able to model the light curve using tidal disruption simulations; we estimated a mass of 2 million Suns for the central black hole. More surprising was the nature of the star it had capt ...
starwalk2 manual en
... Search allows you to find any star, constellation, Solar system body (the planets, the Sun, the Moon), Deep Space object or satellite. Information icon appears in middle of the bottom part of the screen when you select any celestial body on the screen. By tapping this icon you may read tons of info ...
... Search allows you to find any star, constellation, Solar system body (the planets, the Sun, the Moon), Deep Space object or satellite. Information icon appears in middle of the bottom part of the screen when you select any celestial body on the screen. By tapping this icon you may read tons of info ...
an Educator`s GuidE
... These exoplanets are very far away, so how do we actually “see” them? Exoplanets are nearly impossible to photograph in the traditional sense, so we have to find them by observing the effects they have on their parent stars. These effects, driven by gravity and line-of-sight, are visible to us as ei ...
... These exoplanets are very far away, so how do we actually “see” them? Exoplanets are nearly impossible to photograph in the traditional sense, so we have to find them by observing the effects they have on their parent stars. These effects, driven by gravity and line-of-sight, are visible to us as ei ...
TAKS objective 5 Earth and Space Systems
... Our sun is a medium-size yellow star. It is 4.6 billion years old. In the sun, hydrogen undergoes nuclear fusion, a process that releases vast amounts of energy. During fusion hydrogen atoms join to form helium atoms. Hydrogen fusion is the source of light, heat, and other radiation from the sun. ST ...
... Our sun is a medium-size yellow star. It is 4.6 billion years old. In the sun, hydrogen undergoes nuclear fusion, a process that releases vast amounts of energy. During fusion hydrogen atoms join to form helium atoms. Hydrogen fusion is the source of light, heat, and other radiation from the sun. ST ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.