Testing relativity from the 1919 eclipse
... eclipse was predicted to take place. Before 1919, several attempts to measure the effect were foiled by a combination of bad weather and World War I.6 Given that Einstein changed his prediction in 1916, it was perhaps fortunate that expeditions before that date had not been successful. The 1919 ecli ...
... eclipse was predicted to take place. Before 1919, several attempts to measure the effect were foiled by a combination of bad weather and World War I.6 Given that Einstein changed his prediction in 1916, it was perhaps fortunate that expeditions before that date had not been successful. The 1919 ecli ...
Testing
... – Gas from dying stars mixes new elements into the interstellar medium, which slowly cools, making the molecular clouds where stars ...
... – Gas from dying stars mixes new elements into the interstellar medium, which slowly cools, making the molecular clouds where stars ...
A Search for Exozodiacal Dust and Faint Companions near Sirius
... We have begun to search for disks that are too faint to be detected photometrically by spatially resolving the critical regions less than 10 AU from nearby stars. Coronagraphic images can also reveal faint companions to nearby stars. Such companions can go undetected by radial velocity surveys becau ...
... We have begun to search for disks that are too faint to be detected photometrically by spatially resolving the critical regions less than 10 AU from nearby stars. Coronagraphic images can also reveal faint companions to nearby stars. Such companions can go undetected by radial velocity surveys becau ...
Chapter15- Our Galaxy-pptx - SFA Physics and Astronomy
... Thought Question Why do orbits of disk stars bob up and down? A. They're stuck to the interstellar medium. B. The gravity of the disk pulls them back toward the disk. C. Halo stars knock them back into the disk. ...
... Thought Question Why do orbits of disk stars bob up and down? A. They're stuck to the interstellar medium. B. The gravity of the disk pulls them back toward the disk. C. Halo stars knock them back into the disk. ...
Solutions to exercises
... (b) The spectral energy distribution of Jupiter peaks at around 0.5 µm. This is very different (by a factor of around 200) to the wavelength of the most favourable contrast ratio. The reason for the discrepancy is that the Sun’s spectral energy distribution also peaks at around 0.5 µm, and the secon ...
... (b) The spectral energy distribution of Jupiter peaks at around 0.5 µm. This is very different (by a factor of around 200) to the wavelength of the most favourable contrast ratio. The reason for the discrepancy is that the Sun’s spectral energy distribution also peaks at around 0.5 µm, and the secon ...
The Submillimeter Frontier: A Space Science Imperative
... luminosity of a typical spiral galaxy (the Milky Way, Figure 1) has just two large bumps, one from 0.2 to 2 µm from the luminosity of stars, and one nearly as large from 50 - 400 µm, from the energy absorbed and reradiated by dust. These two terms dwarf all the others, but only one has been widely o ...
... luminosity of a typical spiral galaxy (the Milky Way, Figure 1) has just two large bumps, one from 0.2 to 2 µm from the luminosity of stars, and one nearly as large from 50 - 400 µm, from the energy absorbed and reradiated by dust. These two terms dwarf all the others, but only one has been widely o ...
Using time to measure distance - AS-A2
... sky. They were both in the south at midnight, which means that the Earth was directly between them and the Sun. This is called an ‘opposition’. It also means that the two planets were both at the same time at their closest to the Earth. At this time Jupiter was the brightest object in the night sky ...
... sky. They were both in the south at midnight, which means that the Earth was directly between them and the Sun. This is called an ‘opposition’. It also means that the two planets were both at the same time at their closest to the Earth. At this time Jupiter was the brightest object in the night sky ...
A Compilation of Relevant Articles from MMM`s first 25 years, issues
... 1.A. Proxima Centauri, a small red M-type star, is just a little closer than the Alpha Centauri double sun of which it is a distant companion. This system lies 60° below the celestial equator, well below the horizon from most of the USA. 2.A. 106 million times as far as the Moon, and 9,000 times as ...
... 1.A. Proxima Centauri, a small red M-type star, is just a little closer than the Alpha Centauri double sun of which it is a distant companion. This system lies 60° below the celestial equator, well below the horizon from most of the USA. 2.A. 106 million times as far as the Moon, and 9,000 times as ...
Thu th surf c
... Thus the surface facing us periodically approaches and recedes from us, thereby causing the spectral lines to shift periodically to the blue and to the red. When we plot a Cepheid's variations in velocity against time we obtain a velocity curve for the star. ...
... Thus the surface facing us periodically approaches and recedes from us, thereby causing the spectral lines to shift periodically to the blue and to the red. When we plot a Cepheid's variations in velocity against time we obtain a velocity curve for the star. ...
Cycles of magnetic activity in solar-type stars. The place of the Sun
... (red circles). The solid line represents the Zero Age Main Sequence (ZAMS) on the Hertzsprung-Russell diagram. Stars which are close to the ZAMS in Figure 1 have the lowest age among all other stars: log(Age/yr) is about 8 - 8.5. The older the star is, the farther it is from the ZAMS. Ages of stars ...
... (red circles). The solid line represents the Zero Age Main Sequence (ZAMS) on the Hertzsprung-Russell diagram. Stars which are close to the ZAMS in Figure 1 have the lowest age among all other stars: log(Age/yr) is about 8 - 8.5. The older the star is, the farther it is from the ZAMS. Ages of stars ...
SciPoster_Jan2009
... associated with any molecular cloud complex, there is mention of an extended distribution of dust between the main clouds in Chamaeleon, Lupus and Ophiuchus (Sartori 2000). Ophiuchus is another region of active star formation, much of which is localized in a region centered on r Oph. According to Wi ...
... associated with any molecular cloud complex, there is mention of an extended distribution of dust between the main clouds in Chamaeleon, Lupus and Ophiuchus (Sartori 2000). Ophiuchus is another region of active star formation, much of which is localized in a region centered on r Oph. According to Wi ...
An Unbiased Near-infrared Interferometric Survey for Hot
... dust is called exozodiacal dust, or exozodi for short, by analogue with the Zodiacal dust in the Solar System. The Zodiacal light can be observed on dark nights directly after dusk and before dawn as a cone of faint light stretching from the horizon in the west (after dusk) or in the east (before da ...
... dust is called exozodiacal dust, or exozodi for short, by analogue with the Zodiacal dust in the Solar System. The Zodiacal light can be observed on dark nights directly after dusk and before dawn as a cone of faint light stretching from the horizon in the west (after dusk) or in the east (before da ...
Lecture 8: Spiral Structure
... traveling a long the road, at less than the speed limit, is a police car (car x) with its radar on. Observing from a helicopter high in the sky, we see the cars fairly evenly distributed along the highway except around the police car. For a short distance behind and in front on the police vehicle, t ...
... traveling a long the road, at less than the speed limit, is a police car (car x) with its radar on. Observing from a helicopter high in the sky, we see the cars fairly evenly distributed along the highway except around the police car. For a short distance behind and in front on the police vehicle, t ...
The absence of CO from the dust peak around ϵ Eri
... within the ring, and ∼15 per cent of it emanating from a dust peak in the ring located 19 arcsec east and 8 arcsec south (ESE) of the star. The ring shows two lesser peaks, to the north-east and southwest of the star, and gaps to the north and west. Searches for gas in a system like Eri should pro ...
... within the ring, and ∼15 per cent of it emanating from a dust peak in the ring located 19 arcsec east and 8 arcsec south (ESE) of the star. The ring shows two lesser peaks, to the north-east and southwest of the star, and gaps to the north and west. Searches for gas in a system like Eri should pro ...
Resume
... phenomenon in young stellar objects (YSOs) caused by the episodic accretion events in protoplanetary discs. I did multi-wavelength (optical, near-infrared, far-infrared and radio) long term monitoring studies (a total of ∼ 175 nights) on a sample of these objects to constrain various stellar and cir ...
... phenomenon in young stellar objects (YSOs) caused by the episodic accretion events in protoplanetary discs. I did multi-wavelength (optical, near-infrared, far-infrared and radio) long term monitoring studies (a total of ∼ 175 nights) on a sample of these objects to constrain various stellar and cir ...
Unravelling the Origin and Evolution of Our Galaxy
... years and, as a result, the disc contains stars with a range of chemical compositions, ages and kinematics. In the past decades, radio and millimetre observations, combined with kinematic models, have revealed the distribution and kinematics of the interstellar gas for nearly the entire Galaxy. They ...
... years and, as a result, the disc contains stars with a range of chemical compositions, ages and kinematics. In the past decades, radio and millimetre observations, combined with kinematic models, have revealed the distribution and kinematics of the interstellar gas for nearly the entire Galaxy. They ...
File
... Not all electromagnetic radiation coming from space reaches the Earth's surface. The diagram shows how far radiation from each part of the electromagnetic spectrum travels down through the atmosphere. ...
... Not all electromagnetic radiation coming from space reaches the Earth's surface. The diagram shows how far radiation from each part of the electromagnetic spectrum travels down through the atmosphere. ...
Document
... Though some models suggested that the gamma-ray bursts were produced within our Galaxy (either very close to us or in a very extended halo), more recent observations have conclusively shown that most of them are actually in galaxies billions of light-years away. ...
... Though some models suggested that the gamma-ray bursts were produced within our Galaxy (either very close to us or in a very extended halo), more recent observations have conclusively shown that most of them are actually in galaxies billions of light-years away. ...
Chandra Characterization of X-ray Emission in the Young F
... formation. As Myr-old F-stars can be expected to be fast rotators, and more convective and X-ray active than their main sequence cousins, we would have naively expected both stars to be rapidly rotating, highly convective, and X-ray bright. We thus obtained Chandra observations of HD 113766 because: ...
... formation. As Myr-old F-stars can be expected to be fast rotators, and more convective and X-ray active than their main sequence cousins, we would have naively expected both stars to be rapidly rotating, highly convective, and X-ray bright. We thus obtained Chandra observations of HD 113766 because: ...
A Method of Correcting Near-Infrared Spectra for Telluric Absorption
... objects consist essentially of H absorption lines and a smooth, featureless (blackbody) continuum. Thus, metal abundance variations do not strongly affect the appearance of the observed spectra and, except for possible differences in the widths and depths of some of the H lines (due to different rot ...
... objects consist essentially of H absorption lines and a smooth, featureless (blackbody) continuum. Thus, metal abundance variations do not strongly affect the appearance of the observed spectra and, except for possible differences in the widths and depths of some of the H lines (due to different rot ...
Constraining tidal dissipation in F-type main
... age estimate from model isochrone fitting in comparison with lower mass stars. A good age estimate is important to constrain the average value of Q by modelling the tidal evolution of a particular system (cf. Sect. 3.3). In Table 1 we list the presently known transiting systems with a star having a ...
... age estimate from model isochrone fitting in comparison with lower mass stars. A good age estimate is important to constrain the average value of Q by modelling the tidal evolution of a particular system (cf. Sect. 3.3). In Table 1 we list the presently known transiting systems with a star having a ...
Habitable Zone Lifetimes of Exoplanets around Main Sequence Stars
... surface, experiencing high rates of evaporation and increasing humidity. The resulting increase in temperature serves to further accelerate evaporation, eventually resulting in the irreversible evaporation of the ocean into the atmosphere (Kasting, 1988; Goldblatt and Watson, 2012). The outer bounda ...
... surface, experiencing high rates of evaporation and increasing humidity. The resulting increase in temperature serves to further accelerate evaporation, eventually resulting in the irreversible evaporation of the ocean into the atmosphere (Kasting, 1988; Goldblatt and Watson, 2012). The outer bounda ...
Blocking Starlight Much Closer to Home 2: This Year`s
... For Charon, with no atmosphere (and our occultation method is very sensitive), the starlight disappears abruptly. If the star is brighter than the occulting object, the occultation is quite noticeable; if the star is fainter, then just a percentage is subtracted from the total. For Pluto (and, earli ...
... For Charon, with no atmosphere (and our occultation method is very sensitive), the starlight disappears abruptly. If the star is brighter than the occulting object, the occultation is quite noticeable; if the star is fainter, then just a percentage is subtracted from the total. For Pluto (and, earli ...
Chapter 13 – Behavior of Spectral Lines
... • It is an ad hoc free parameter in the analysis, with values typically between 0.5 and 5 km/sec • Lower luminosity stars generally have lower values of microturbulence. • The microturbulence is determined as the value of x that makes the abundance independent of line ...
... • It is an ad hoc free parameter in the analysis, with values typically between 0.5 and 5 km/sec • Lower luminosity stars generally have lower values of microturbulence. • The microturbulence is determined as the value of x that makes the abundance independent of line ...
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.