Mission Possible: Voyage to the Stars
... All stars are created from a nebula but where they go after that depends on their mass. All aspects of a star including size, temperature, life history, and luminosity are determined by the original mass of the star. The HertzsprungRussell diagram is a diagram that is used by astronomers to classify ...
... All stars are created from a nebula but where they go after that depends on their mass. All aspects of a star including size, temperature, life history, and luminosity are determined by the original mass of the star. The HertzsprungRussell diagram is a diagram that is used by astronomers to classify ...
Metal-poor Stars
... [Fe/H] < −4.0 are extremely C-rich. The fraction of C-rich stars may also increase with increasing distance from the Galactic plane (Frebel et al. 2006b). Many C-rich stars also show an enhancement in neutron-capture elements. These elements are produced in the interiors of intermediate-mass asympto ...
... [Fe/H] < −4.0 are extremely C-rich. The fraction of C-rich stars may also increase with increasing distance from the Galactic plane (Frebel et al. 2006b). Many C-rich stars also show an enhancement in neutron-capture elements. These elements are produced in the interiors of intermediate-mass asympto ...
1. INTRODUCTION - Institut für Theoretische Astrophysik
... emission in these lines and the observed basal Ñux emission, which had been suspected to be due to nonmagnetic (i.e., acoustic) heating operating in all late-type stars. The height dependence of the acoustic energy Ñux can be explained by the limiting strength property of the acoustic shocks and is ...
... emission in these lines and the observed basal Ñux emission, which had been suspected to be due to nonmagnetic (i.e., acoustic) heating operating in all late-type stars. The height dependence of the acoustic energy Ñux can be explained by the limiting strength property of the acoustic shocks and is ...
Star formation rates and efficiencies in the Galactic Centre
... a difficult quantity to determine, as inferences of the threedimensional structure have to be made in order to convert two-dimensional line-of-sight column density measurements. The measured column density of hydrogen in the CMZ appears to be at least an order of magnitude higher than clouds within ...
... a difficult quantity to determine, as inferences of the threedimensional structure have to be made in order to convert two-dimensional line-of-sight column density measurements. The measured column density of hydrogen in the CMZ appears to be at least an order of magnitude higher than clouds within ...
Cygnus X-2, super-Eddington mass transfer, and pulsar binaries
... ∼ 1 because of the orbital shrinkage. Once M2 is reduced to the point that q < ∼ 1, the Roche lobe begins to expand. This slows the mass transfer, and shuts it off entirely when the lobe reaches the thermal-equilibrium radius of the secondary, since the latter then has no tendency to expand further ...
... ∼ 1 because of the orbital shrinkage. Once M2 is reduced to the point that q < ∼ 1, the Roche lobe begins to expand. This slows the mass transfer, and shuts it off entirely when the lobe reaches the thermal-equilibrium radius of the secondary, since the latter then has no tendency to expand further ...
GRAVITY: Observing the Universe in Motion
... Based on this success, ESO and SELEX– Galileo are currently developing a next generation detector, which is tuned to GRAVITY’s wavefront sensor and fringe tracker. Another example of a major breakthrough is in GRAVITY’s laser metrology. It is based on a novel concept, and traces the starlight throu ...
... Based on this success, ESO and SELEX– Galileo are currently developing a next generation detector, which is tuned to GRAVITY’s wavefront sensor and fringe tracker. Another example of a major breakthrough is in GRAVITY’s laser metrology. It is based on a novel concept, and traces the starlight throu ...
The High Eccentricity of the Planet Around 16 Cyg B
... two stars are physically connected. Both features are very intriguing. Prior to the discovery of 16 Cyg B planet, Mazeh, Mayor & Latham (1996) pointed out that the other seven ”planet-candidates” display a correlation between their masses and orbital eccentricities. Companions with masses smaller th ...
... two stars are physically connected. Both features are very intriguing. Prior to the discovery of 16 Cyg B planet, Mazeh, Mayor & Latham (1996) pointed out that the other seven ”planet-candidates” display a correlation between their masses and orbital eccentricities. Companions with masses smaller th ...
Navigation: The Mariner`s Quadrant
... edges for sighting. The only scale needed was the degree marks on the curved edge. It was light and easy to handle. ...
... edges for sighting. The only scale needed was the degree marks on the curved edge. It was light and easy to handle. ...
Impact of atmospheric refraction: How deeply can we probe exo
... Misra et al. 2014) modeling the spectrum of the Earth’s atmosphere viewed as a transiting exoplanet. However, most models predicting, or fitting, the spectral dependence of planetary transits have not fully included a fundamental phenomenon of the atmosphere on radiation: refraction. As light rays t ...
... Misra et al. 2014) modeling the spectrum of the Earth’s atmosphere viewed as a transiting exoplanet. However, most models predicting, or fitting, the spectral dependence of planetary transits have not fully included a fundamental phenomenon of the atmosphere on radiation: refraction. As light rays t ...
4-H MOTTO
... Light is one of the most important aspects of astronomy. Everything that we can see in the night sky, whether it is a star, a planet or a galaxy, emits light. If an object did not emit light then we would not know it was there. Objects such as stars, galaxies and nebulae generate their own light whe ...
... Light is one of the most important aspects of astronomy. Everything that we can see in the night sky, whether it is a star, a planet or a galaxy, emits light. If an object did not emit light then we would not know it was there. Objects such as stars, galaxies and nebulae generate their own light whe ...
Stellarium User Guide - Skolekonsulenterne.dk
... planetarium. It will calculate the positions of the Sun and Moon, planets and stars, and draw how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses. S ...
... planetarium. It will calculate the positions of the Sun and Moon, planets and stars, and draw how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses. S ...
Lives of Stars - Astronomy Outreach
... PAGE: Well, finally all the available gravitational potential energy was spent. The fusion stops, leaving the carbon core. What happens next? SOL: Just before the core went out, the outer envelope transformed into a beautiful sight. A series of helium fusion flashes destabilized the gas, and caused ...
... PAGE: Well, finally all the available gravitational potential energy was spent. The fusion stops, leaving the carbon core. What happens next? SOL: Just before the core went out, the outer envelope transformed into a beautiful sight. A series of helium fusion flashes destabilized the gas, and caused ...
Spectroscopic Variability of Supergiant Star HD14134, B3Ia
... Hα profile in the spectrum of the star HD14134 had the shape of an inverse P Cygni profile (Fig.1a). Another variability pattern, where Hα appears only in weak emission (13/02/2016). The Hα line was absent in the spectra of December 29-30, 2013 and of February 15, 2016, while two carbon lines CII (λ 6 ...
... Hα profile in the spectrum of the star HD14134 had the shape of an inverse P Cygni profile (Fig.1a). Another variability pattern, where Hα appears only in weak emission (13/02/2016). The Hα line was absent in the spectra of December 29-30, 2013 and of February 15, 2016, while two carbon lines CII (λ 6 ...
Spectroscopic Variability of Supergiant Star HD14134, B3Ia
... Hα profile in the spectrum of the star HD14134 had the shape of an inverse P Cygni profile (Fig.1a). Another variability pattern, where Hα appears only in weak emission (13/02/2016). The Hα line was absent in the spectra of December 29-30, 2013 and of February 15, 2016, while two carbon lines CII (λ 6 ...
... Hα profile in the spectrum of the star HD14134 had the shape of an inverse P Cygni profile (Fig.1a). Another variability pattern, where Hα appears only in weak emission (13/02/2016). The Hα line was absent in the spectra of December 29-30, 2013 and of February 15, 2016, while two carbon lines CII (λ 6 ...
Stars & Galaxies - newmanlib.ibri.org
... • From earth, without telescopes, stars are just points of light in the sky. • The ancients called any bright light in the sky a star, distinguishing various types: – Fixed stars – Wandering stars (planets, sun, moon) – Hairy stars (comets) – Shooting stars (meteors) ...
... • From earth, without telescopes, stars are just points of light in the sky. • The ancients called any bright light in the sky a star, distinguishing various types: – Fixed stars – Wandering stars (planets, sun, moon) – Hairy stars (comets) – Shooting stars (meteors) ...
File
... The Boeotian King had two children, a son named Phrixus and a twin sister Helle. After Nephele, king Athamas’s first wife, died the king took a new wife named Ino. Ino had an incredibly deep hate for her new step children and had to find a way to get rid of them. After thinking and thinking Ino had ...
... The Boeotian King had two children, a son named Phrixus and a twin sister Helle. After Nephele, king Athamas’s first wife, died the king took a new wife named Ino. Ino had an incredibly deep hate for her new step children and had to find a way to get rid of them. After thinking and thinking Ino had ...
Discovery of White Dwarfs—1 Oct • Adams’ discovery
... – fB/fA = 10−(mB−mA)/2.5 – mB−mA = −2.5 log(fB/fA) ...
... – fB/fA = 10−(mB−mA)/2.5 – mB−mA = −2.5 log(fB/fA) ...
Extragalactic Distances from Planetary Nebulae
... The Planetary Nebula Luminosity Function continues to be a useful tool for extragalactic astronomy and cosmology. • The PNLF is the only standard candle capable of measuring distances to all the large galaxies of the local supercluster. • The PNLF cutoff, M*, is the same for old and young ...
... The Planetary Nebula Luminosity Function continues to be a useful tool for extragalactic astronomy and cosmology. • The PNLF is the only standard candle capable of measuring distances to all the large galaxies of the local supercluster. • The PNLF cutoff, M*, is the same for old and young ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.