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 ...
Evidence for a signature of the galactic bar in the solar neighbourhood
... ment of the models with the COBE/DIRBE data), u of the order of 20 km s−1 are obtained, in agreement with the observations reported in Fig. 1. Fig. 6 is a slice cutting of Fig. 5 for φ = 30◦ . The values of u have been averaged within bins of 200 Myr time width. One obtains a significantly positive ...
... ment of the models with the COBE/DIRBE data), u of the order of 20 km s−1 are obtained, in agreement with the observations reported in Fig. 1. Fig. 6 is a slice cutting of Fig. 5 for φ = 30◦ . The values of u have been averaged within bins of 200 Myr time width. One obtains a significantly positive ...
The Sun - Our Star
... the opacity. As a result, the rate of temperature decline becomes steep and convection takes over the energy transport in the outer 30% of the Sun’s radius Typically, the diffusion of energy from core to surface takes on average 170,000 years. ...
... the opacity. As a result, the rate of temperature decline becomes steep and convection takes over the energy transport in the outer 30% of the Sun’s radius Typically, the diffusion of energy from core to surface takes on average 170,000 years. ...
Estimating the mass and star formation rate in galaxies
... As we can see from the image above, which displays a depiction of the atmospheric transmission as a function of wavelength, even though all light can reach the earth’s surface in the optical, in the infrared only distinct windows exist. These are mostly in the near‐infa ...
... As we can see from the image above, which displays a depiction of the atmospheric transmission as a function of wavelength, even though all light can reach the earth’s surface in the optical, in the infrared only distinct windows exist. These are mostly in the near‐infa ...
Where is the best site on Earth? Dome A, B, C and F, and Ridges A
... ・Lithium abundance log n=0.77 → comparably young system ・v sin i=33+/-2km/s ・The orbit is circular with a period of 5.998 days. ・The photometric (=rotational) period of the K1 subgiant is 5.929+/-0.024 days → the orbital motion and the stellar rotation are bound ? ...
... ・Lithium abundance log n=0.77 → comparably young system ・v sin i=33+/-2km/s ・The orbit is circular with a period of 5.998 days. ・The photometric (=rotational) period of the K1 subgiant is 5.929+/-0.024 days → the orbital motion and the stellar rotation are bound ? ...
The Galactic Halo The Galactic Disk Height and Thickness of MW
... Shapley’s Center of the Galaxy " To find the center of the Galaxy, Shapley measured the distance to each cluster using RR Lyrae stars and produced a three dimensional plot of the clusters’ positions. The center of the Galaxy was then identified by the average position of the clusters. " We now know ...
... Shapley’s Center of the Galaxy " To find the center of the Galaxy, Shapley measured the distance to each cluster using RR Lyrae stars and produced a three dimensional plot of the clusters’ positions. The center of the Galaxy was then identified by the average position of the clusters. " We now know ...
Astronomy 100 Name(s):
... Follow the instructions on the laminated sheet to start up the software “SCSpec”. After clicking on the “Connect” button, it should quickly turn into a “Disconnect” button. If this does not happen, let me know! You should see a rainbow-like set of colors appear on the left of the screen. Do not worr ...
... Follow the instructions on the laminated sheet to start up the software “SCSpec”. After clicking on the “Connect” button, it should quickly turn into a “Disconnect” button. If this does not happen, let me know! You should see a rainbow-like set of colors appear on the left of the screen. Do not worr ...
Stellarium01 Starter Part A B Doc - ASTR101
... Start Stellarium. Use “Current Location” listed above by going to the Icon Bar at the left-hand side of the screen and find the Location window icon (shortcut key= “F6”, in some linux it is fn-f6) and click on it. Scroll through the list of locations in the window until you find the current location ...
... Start Stellarium. Use “Current Location” listed above by going to the Icon Bar at the left-hand side of the screen and find the Location window icon (shortcut key= “F6”, in some linux it is fn-f6) and click on it. Scroll through the list of locations in the window until you find the current location ...
Elliptical galaxies
... plane relation (last panel) They express some fundamental property of E galaxies. They can be understood partially from the virial theorem ...
... plane relation (last panel) They express some fundamental property of E galaxies. They can be understood partially from the virial theorem ...
Astronomy and the Coal Age of Alabama
... The Big Dipper would have looked virtually the same to the ancient Egyptians, but 100,000 years ago it looked different. It will further lose its familiar shape in the future. Its 7 bright stars are not all at the same distance. This kind of thing can’t be extrapolated too far backward or forward i ...
... The Big Dipper would have looked virtually the same to the ancient Egyptians, but 100,000 years ago it looked different. It will further lose its familiar shape in the future. Its 7 bright stars are not all at the same distance. This kind of thing can’t be extrapolated too far backward or forward i ...
Expanding Universe and Big Bang
... a) The Doppler Effect is observed in sound and light. For sound, the apparent change in frequency as a source moves towards or away from a stationary observer should be investigated. The Doppler Effect causes similar shifts in wavelengths of light. The light from objects moving away from us is shift ...
... a) The Doppler Effect is observed in sound and light. For sound, the apparent change in frequency as a source moves towards or away from a stationary observer should be investigated. The Doppler Effect causes similar shifts in wavelengths of light. The light from objects moving away from us is shift ...
Exploration of the Kuiper Belt by High-Precision Photometric
... exhibit an almost continuous size distribution from kilometer- to 5 m scale objects. Extrapolating the size distribution of the known KBOs down to objects of 1 km radius leads to 1011 KBOs with a total mass of only 0.1 Mo (Gladman et al. 2001). In contrast, a simple extrapolation of the surface mas ...
... exhibit an almost continuous size distribution from kilometer- to 5 m scale objects. Extrapolating the size distribution of the known KBOs down to objects of 1 km radius leads to 1011 KBOs with a total mass of only 0.1 Mo (Gladman et al. 2001). In contrast, a simple extrapolation of the surface mas ...
Altair - the hottest `cool` star in X-rays
... 2.4 MK and its emission measure distribution (EMD) is dominated by rather cool plasma at temperatures in the range of 1 – 4 MK, additionally a weak hotter component seems to contribute at a few percent level. These properties are quite typical for weakly active stars and similar to those of the quie ...
... 2.4 MK and its emission measure distribution (EMD) is dominated by rather cool plasma at temperatures in the range of 1 – 4 MK, additionally a weak hotter component seems to contribute at a few percent level. These properties are quite typical for weakly active stars and similar to those of the quie ...
Stargazer - Everett Astronomical Society
... In addition you will be able subscribe to Sky and Telescope for $7 off the normal subscription rate, contact the treasurer (Carol Gore) for more information. http://everettastro.org/application.htm (When renewing your subscription to Sky & Telescope you should send your S&T renewal form along with a ...
... In addition you will be able subscribe to Sky and Telescope for $7 off the normal subscription rate, contact the treasurer (Carol Gore) for more information. http://everettastro.org/application.htm (When renewing your subscription to Sky & Telescope you should send your S&T renewal form along with a ...
CHP 10
... b. dense molecular clouds. c. HII regions. d. the intercloud medium. e. the local bubble. _______________ is/are believed to make up 50 percent of the mass of the interstellar medium. a. The intercloud medium b. HI clouds c. Coronal gas d. Molecular clouds e. Dark nebulae Absorption lines due to int ...
... b. dense molecular clouds. c. HII regions. d. the intercloud medium. e. the local bubble. _______________ is/are believed to make up 50 percent of the mass of the interstellar medium. a. The intercloud medium b. HI clouds c. Coronal gas d. Molecular clouds e. Dark nebulae Absorption lines due to int ...
6 The mysterious universe
... Hertzsprung–Russell diagram but in much smaller numbers than in the main sequence. The names of these stars — white dwarfs, red giants, blue giants and super giants — clearly describe their characteristics. Astronomers suggest that all stars begin their existence in the main sequence and spend the l ...
... Hertzsprung–Russell diagram but in much smaller numbers than in the main sequence. The names of these stars — white dwarfs, red giants, blue giants and super giants — clearly describe their characteristics. Astronomers suggest that all stars begin their existence in the main sequence and spend the l ...
Quasars- The Brightest Black Holes
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
... In 1962 an opportunity arose for a much clearer determination of the position of one of these powerful but as yet unidentified sources, 3C273, when it would be eclipsed by the Moon three times - in May, August and October. The advantage of such an event is that we always know the position of the Mo ...
Additional Cosmology Images
... A collage of prominences, which are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere. For all four images, emission in this HeII spectral line recorded by the Extreme ultraviolet Imaging Telescope (EIT) at 3 ...
... A collage of prominences, which are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere. For all four images, emission in this HeII spectral line recorded by the Extreme ultraviolet Imaging Telescope (EIT) at 3 ...
Advanced STARS - WordPress.com
... A: A fixed star (from the Latin stellae fixae) is any celestial object that does not seem to move in relation to the other stars of the night sky. Hence, a fixed star is any star except for the Sun. A nebula or other star-like object may also be called a fixed star.. ...
... A: A fixed star (from the Latin stellae fixae) is any celestial object that does not seem to move in relation to the other stars of the night sky. Hence, a fixed star is any star except for the Sun. A nebula or other star-like object may also be called a fixed star.. ...
Lecture 17
... This is really tiny. We cannot resolve multiple images when the separation is only 1 miliarcsecond. This regime of lensing is called “microlensing”. For experiments trying to detect stellar-mass lenses in the Galactic halo using stars in the Large Magellanic cloud (LMC) which is 50 kpc away, you can ...
... This is really tiny. We cannot resolve multiple images when the separation is only 1 miliarcsecond. This regime of lensing is called “microlensing”. For experiments trying to detect stellar-mass lenses in the Galactic halo using stars in the Large Magellanic cloud (LMC) which is 50 kpc away, you can ...
R136a1
RMC 136a1 (usually abbreviated to R136a1) is a Wolf-Rayet star located at the center of R136, the central condensation of stars of the large NGC 2070 open cluster in the Tarantula Nebula. It lies at a distance of about 50 kiloparsecs (163,000 light-years) in the Large Magellanic Cloud. It has the highest mass and luminosity of any known star, at 265 M☉ and 8.7 million L☉, and also one of the hottest at over 50,000 K.