Maximizing the ExoEarth Candidate Yield from a Future Direct
... relatively small, and in the case of single-visit studies, as discussed below, the yield scales weakly with mission lifetime. Therefore, spectral characterization time should not greatly impact the single-visit yield estimates from this study. Finally, we observe each star only once and ignore revis ...
... relatively small, and in the case of single-visit studies, as discussed below, the yield scales weakly with mission lifetime. Therefore, spectral characterization time should not greatly impact the single-visit yield estimates from this study. Finally, we observe each star only once and ignore revis ...
Towards the understanding of the deepest layers of solar
... I would like to start by thanking both my supervisors, Dra. Margarida Cunha and Prof. Dr. Jørgen Christensen-Dalsgaard, without whom the realization of this thesis would not have been possible. I would like to give a very special thank to Prof. Dr. Jørgen ChristensenDalsgaard for his hospitality and ...
... I would like to start by thanking both my supervisors, Dra. Margarida Cunha and Prof. Dr. Jørgen Christensen-Dalsgaard, without whom the realization of this thesis would not have been possible. I would like to give a very special thank to Prof. Dr. Jørgen ChristensenDalsgaard for his hospitality and ...
abstracts book - Instituto de Astrofísica e Ciências do Espaço
... across the HR diagram with a level of detail that was in no way foreseen in 1985. In spite of the great science successes, astero- and helioseismic data still contain many secrets waiting to be uncovered. The opportunity to use the existing data and tools to clarify major questions of stellar physic ...
... across the HR diagram with a level of detail that was in no way foreseen in 1985. In spite of the great science successes, astero- and helioseismic data still contain many secrets waiting to be uncovered. The opportunity to use the existing data and tools to clarify major questions of stellar physic ...
A Revised DDO Abundance Calibration for Population I Red Giants
... Galactic disk, but also to the more metal-poor stars of the old disk having [Fe/H] between – 0.3 and – 0.8. There are at least three reasons to justify embarking on a new DDO abundance calibration for population IG and Κ giants. First of all, the sample of field and open cluster red giants with abun ...
... Galactic disk, but also to the more metal-poor stars of the old disk having [Fe/H] between – 0.3 and – 0.8. There are at least three reasons to justify embarking on a new DDO abundance calibration for population IG and Κ giants. First of all, the sample of field and open cluster red giants with abun ...
HD 100453: An Evolutionary link between
... If motion through space is common, they are likely physical companions ...
... If motion through space is common, they are likely physical companions ...
A spectroscopic study of detached binary systems using precise radial velocities
... Spectroscopic orbital elements and/or related parameters have been determined for eight binary systems, using radial-velocity measurements that have a typical precision of about 15 m s−1 . The orbital periods of these systems range from about 10 days to 26 years, with a median of about 6 years. Orbi ...
... Spectroscopic orbital elements and/or related parameters have been determined for eight binary systems, using radial-velocity measurements that have a typical precision of about 15 m s−1 . The orbital periods of these systems range from about 10 days to 26 years, with a median of about 6 years. Orbi ...
Predicting the Motions of the Stars, Sun, and Moon
... and that can be applied to explain new observations. An excellent example is the theory of gravitation, which was devised by the English scientist Isaac Newton in the late 1600s to explain the orbits of the six planets known at that time. When astronomers of later centuries discovered the planets Ur ...
... and that can be applied to explain new observations. An excellent example is the theory of gravitation, which was devised by the English scientist Isaac Newton in the late 1600s to explain the orbits of the six planets known at that time. When astronomers of later centuries discovered the planets Ur ...
Mapping of the extinction in giant molecular clouds using optical star
... between m − 1/2 and m + 1/2) in each cell of a regular rectangular grid in an obscured area and to compare the result with the counts obtained in a supposedly unextinguished region. In order to improve the spatial resolution, Bok (1956) proposed to make count up to the completeness limiting magnitud ...
... between m − 1/2 and m + 1/2) in each cell of a regular rectangular grid in an obscured area and to compare the result with the counts obtained in a supposedly unextinguished region. In order to improve the spatial resolution, Bok (1956) proposed to make count up to the completeness limiting magnitud ...
Astronomy Astrophysics - Niels Bohr Institutet
... The bulk of the radial-velocity data presented here was obtained with the photoelectric cross-correlation spectrometers CORAVEL (Baranne et al. 1979; Mayor 1985). Operated at the Swiss 1-m telescope at Observatoire de Haute-Provence, France, and the Danish 1.5-m telescope at ESO, La Silla, the two C ...
... The bulk of the radial-velocity data presented here was obtained with the photoelectric cross-correlation spectrometers CORAVEL (Baranne et al. 1979; Mayor 1985). Operated at the Swiss 1-m telescope at Observatoire de Haute-Provence, France, and the Danish 1.5-m telescope at ESO, La Silla, the two C ...
Earth and Our Solar System File
... • Largest planet in the Solar System (300 times bigger than Earth) • 28 moons • It is a gas planet and has no solid surface • Has a giant storm -the ‘Red Spot’ with 250 mph winds (twice the size of Earth) ...
... • Largest planet in the Solar System (300 times bigger than Earth) • 28 moons • It is a gas planet and has no solid surface • Has a giant storm -the ‘Red Spot’ with 250 mph winds (twice the size of Earth) ...
VIPNET NEWS T The Annular Solar Eclipse January 15, 2010
... Sun. If an eclipse occurs at that time, it will be a total eclipse. However, if an eclipse occurs while the Moon is on the far side of its orbit, the Moon appears smaller than the Sun and can’t completely cover it. Looking down from space, we would see that the Moon’s umbral shadow is not long enoug ...
... Sun. If an eclipse occurs at that time, it will be a total eclipse. However, if an eclipse occurs while the Moon is on the far side of its orbit, the Moon appears smaller than the Sun and can’t completely cover it. Looking down from space, we would see that the Moon’s umbral shadow is not long enoug ...
WAS THE SUN BORN IN A MASSIVE CLUSTER?
... A number of authors have argued that the Sun must have been born in a cluster of no more than several thousand stars, on the basis that, in a larger cluster, close encounters between the Sun and other stars would have truncated the outer solar system or excited the outer planets into eccentric orbit ...
... A number of authors have argued that the Sun must have been born in a cluster of no more than several thousand stars, on the basis that, in a larger cluster, close encounters between the Sun and other stars would have truncated the outer solar system or excited the outer planets into eccentric orbit ...
White dwarf binary
... drives outer layers into space The Crab Nebula is the remnant of the supernova seen in A.D. 1054 ...
... drives outer layers into space The Crab Nebula is the remnant of the supernova seen in A.D. 1054 ...
Protoplanetary Discs
... “If this interpretation of T Tauri stars is correct, it will provide new and important evidence on the conditions under which the planets in the solar system were formed.” Lynden-Bell & Pringle 1974 (as quoted in Hartmann 2000) Definitions: T Tauri star (TTS): young star ≲ 10-20 Myr with 0.5 < M < 2 ...
... “If this interpretation of T Tauri stars is correct, it will provide new and important evidence on the conditions under which the planets in the solar system were formed.” Lynden-Bell & Pringle 1974 (as quoted in Hartmann 2000) Definitions: T Tauri star (TTS): young star ≲ 10-20 Myr with 0.5 < M < 2 ...
Open clusters and associations in the Gaia era
... and are most probably bound have an age that is larger than their crossing time tcr , they suggest to use the ratio π = age/tcr as a proxy to distinguish between clusters (π > 1) and associations (π < 1). However the π value is only indicative for regions younger than 10Myr and the distinction is no ...
... and are most probably bound have an age that is larger than their crossing time tcr , they suggest to use the ratio π = age/tcr as a proxy to distinguish between clusters (π > 1) and associations (π < 1). However the π value is only indicative for regions younger than 10Myr and the distinction is no ...
Chapter 19
... • Age of the Universe Scientist use to methods to study the age of the universe. • By measuring the distance between Earth and various galaxies, scientists can predict the rate of expansion and calculate the age of the universe. • Because the universe must at least be as old as the oldest stars it c ...
... • Age of the Universe Scientist use to methods to study the age of the universe. • By measuring the distance between Earth and various galaxies, scientists can predict the rate of expansion and calculate the age of the universe. • Because the universe must at least be as old as the oldest stars it c ...
- Isaac Newton Group of Telescopes
... the presence of prominent bands of titanium oxide and, especially, vanadium oxide at 750 nm allowed to derive its spectral classification and an estimate of its effective surface temperature, which turned out to be some 2350 K. The spectrum allowed to infere a velocity measurement of this object in ...
... the presence of prominent bands of titanium oxide and, especially, vanadium oxide at 750 nm allowed to derive its spectral classification and an estimate of its effective surface temperature, which turned out to be some 2350 K. The spectrum allowed to infere a velocity measurement of this object in ...
The spectroscopic Hertzsprung-Russell diagram
... the absolute brightnesses, i.e. the distances, are required to properly order the stars in the HR diagram. Also for stars in star clusters, where the distance may still be unknown, but the distances of all stars are roughly equal, order can be achieved in what we now call color-magnitude diagrams, s ...
... the absolute brightnesses, i.e. the distances, are required to properly order the stars in the HR diagram. Also for stars in star clusters, where the distance may still be unknown, but the distances of all stars are roughly equal, order can be achieved in what we now call color-magnitude diagrams, s ...
X-Ray Properties of Young Stars and Stellar Clusters
... Star and planet formation is generally viewed as a hydrodynamic process involving gravitational collapse of interstellar material at low temperatures, 10–100 K in molecular cloud cores and 100–1500 K in protoplanetary disks. If thermodynamical equilibrium holds, this material should be neutral excep ...
... Star and planet formation is generally viewed as a hydrodynamic process involving gravitational collapse of interstellar material at low temperatures, 10–100 K in molecular cloud cores and 100–1500 K in protoplanetary disks. If thermodynamical equilibrium holds, this material should be neutral excep ...
JENAM-2011 Book of abstracts
... stars and stellar mass black holes in X-ray binaries. Chandra and XMM-Newton observations revealed that their populations scale with the star-formation rate and stellar mass of the host galaxy. Thus, the X-ray luminosity of a star- forming galaxy can be used as a star-formation rate proxy. The lumin ...
... stars and stellar mass black holes in X-ray binaries. Chandra and XMM-Newton observations revealed that their populations scale with the star-formation rate and stellar mass of the host galaxy. Thus, the X-ray luminosity of a star- forming galaxy can be used as a star-formation rate proxy. The lumin ...
A Comet-Hunter`s Legacy -
... recorded by these images may be the latest, but are by no means the most important episode of stellar interactions between these two galaxies, and that their past and future contain cataclysmic events that dwarf by far their present activity. ...
... recorded by these images may be the latest, but are by no means the most important episode of stellar interactions between these two galaxies, and that their past and future contain cataclysmic events that dwarf by far their present activity. ...
QAT Trial Answers 2015
... BCS theory proposes that the electrons in superconductors at temperatures below their critical temperatures form pairs in special electron-lattice-electron interactions to form what is known as ‘Cooper-pairs’. There is experimental evidence that supports this proposition. The theory also proposes th ...
... BCS theory proposes that the electrons in superconductors at temperatures below their critical temperatures form pairs in special electron-lattice-electron interactions to form what is known as ‘Cooper-pairs’. There is experimental evidence that supports this proposition. The theory also proposes th ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.