Observations, Modeling and Theory of Debris Disks
... Fig. 3.— Fractional luminosity of dust versus effective stellar temperatures for main-sequence stars. Squares: A stars (Su et al. 2006); triangles: FGK stars (Trilling et al. 2008); diamonds: FGK stars (Eiroa et al. 2013); asterisks: AFGKM stars (Matthews et al. 2013b). at distances less than 20 pc ...
... Fig. 3.— Fractional luminosity of dust versus effective stellar temperatures for main-sequence stars. Squares: A stars (Su et al. 2006); triangles: FGK stars (Trilling et al. 2008); diamonds: FGK stars (Eiroa et al. 2013); asterisks: AFGKM stars (Matthews et al. 2013b). at distances less than 20 pc ...
IAC_L2_thindisk
... • the thick disk stars are all old (> 10 Gyr) and have abundances between about -0.3 to -1.2, with a metal-weak tail extending down to about -2.0. • the thick disk stars form an -enhanced sequence in the [ /Fe] vs [Fe/H]. Because of operational difficulties in assigning individual stars kinematica ...
... • the thick disk stars are all old (> 10 Gyr) and have abundances between about -0.3 to -1.2, with a metal-weak tail extending down to about -2.0. • the thick disk stars form an -enhanced sequence in the [ /Fe] vs [Fe/H]. Because of operational difficulties in assigning individual stars kinematica ...
Observations, Modeling and Theory of Debris Disks
... Fig. 3.— Fractional luminosity of dust versus effective stellar temperatures for main-sequence stars. Squares: A stars (Su et al. 2006); triangles: FGK stars (Trilling et al. 2008); diamonds: FGK stars (Eiroa et al. 2013); asterisks: AFGKM stars (Matthews et al. 2013b). at distances less than 20 pc ...
... Fig. 3.— Fractional luminosity of dust versus effective stellar temperatures for main-sequence stars. Squares: A stars (Su et al. 2006); triangles: FGK stars (Trilling et al. 2008); diamonds: FGK stars (Eiroa et al. 2013); asterisks: AFGKM stars (Matthews et al. 2013b). at distances less than 20 pc ...
- Isaac Newton Group of Telescopes
... heliocentric distance of 7.2 AU in July 1995. What was significant about this discovery was both the large distance at which it was discovered, and that it was already at an integrated magnitude of ∼10.5. To put this into context, at the same distance from the Sun Comet Halley was at V=22.8. This di ...
... heliocentric distance of 7.2 AU in July 1995. What was significant about this discovery was both the large distance at which it was discovered, and that it was already at an integrated magnitude of ∼10.5. To put this into context, at the same distance from the Sun Comet Halley was at V=22.8. This di ...
Stellar Populations of Dwarf Elliptical Galaxies: UBVRI Photometry
... Cluster with previously measured kinematic properties. The global optical colors are red, with median values for the sample of 0.24 ± 0.03 in (U–B), 0.77 ± 0.02 in (B– V), and 1.02 ± 0.03 in (V–I). We recover the well known color-magnitude relation for cluster galaxies, but find no significant diffe ...
... Cluster with previously measured kinematic properties. The global optical colors are red, with median values for the sample of 0.24 ± 0.03 in (U–B), 0.77 ± 0.02 in (B– V), and 1.02 ± 0.03 in (V–I). We recover the well known color-magnitude relation for cluster galaxies, but find no significant diffe ...
Chapter J2
... telescope, a quasar appears as a small, dim star. Quasars are the most distant objects that have been observed from Earth. But many quasars are hundreds of times brighter than the brightest galaxy. Because quasars are so far away from Earth and yet are very bright, they most likely emit a large amou ...
... telescope, a quasar appears as a small, dim star. Quasars are the most distant objects that have been observed from Earth. But many quasars are hundreds of times brighter than the brightest galaxy. Because quasars are so far away from Earth and yet are very bright, they most likely emit a large amou ...
Historic mass loss from the RS Ophiuchi system
... Stars with an initial mass between ∼ 1 and ∼ 40 M¯ become hydrogen/heliumshell-burning Asymptotic Giant Branch (AGB) stars or core-helium-burning red supergiants (RSG). These phases are characterised by cool, molecular atmospheres giving rise to M spectral types (S or C for some chemically peculiar ...
... Stars with an initial mass between ∼ 1 and ∼ 40 M¯ become hydrogen/heliumshell-burning Asymptotic Giant Branch (AGB) stars or core-helium-burning red supergiants (RSG). These phases are characterised by cool, molecular atmospheres giving rise to M spectral types (S or C for some chemically peculiar ...
A non-LTE analysis of the hot subdwarf O star BD+28°4211
... outnumbered by sdBs (these stars show a number ratio ≈1:3; Heber 2009), the true reason for this relative lack of investigations must be found in the inherent challenge associated with the atmospheric modeling and spectroscopic analyses of very hot stars. For a star with T eff 50 000 K, the fundame ...
... outnumbered by sdBs (these stars show a number ratio ≈1:3; Heber 2009), the true reason for this relative lack of investigations must be found in the inherent challenge associated with the atmospheric modeling and spectroscopic analyses of very hot stars. For a star with T eff 50 000 K, the fundame ...
1. INTRODUCTION - Institut für Theoretische Astrophysik
... code, the same height grid, and also employ the same radiation treatment. The starting models are then constructed by using the usual temperature and Ñux correction procedures as discussed by Cuntz, Rammacher, & Ulmschneider (1994). The energy Ñux and spectrum of acoustic waves generated in the conv ...
... code, the same height grid, and also employ the same radiation treatment. The starting models are then constructed by using the usual temperature and Ñux correction procedures as discussed by Cuntz, Rammacher, & Ulmschneider (1994). The energy Ñux and spectrum of acoustic waves generated in the conv ...
1998 - Universitäts-Sternwarte München
... stellar wind of giant stars, the occurrence of planetary nebulae, or the very spectacular supernova events. Nowadays, it is therefore no surprise that the ancient stars of the Galactic halo are found to be metal-poor objects – as opposed to the understanding when they were first analyzed in the 1950 ...
... stellar wind of giant stars, the occurrence of planetary nebulae, or the very spectacular supernova events. Nowadays, it is therefore no surprise that the ancient stars of the Galactic halo are found to be metal-poor objects – as opposed to the understanding when they were first analyzed in the 1950 ...
cassini, rømer and the velocity of light
... of longitude of these places after small well-known corrections are made. Prior to this, lunar eclipses were used, but as Cassini (ibid.) noted, “… these eclipses are not frequent enough, and they are so difficult to observe that one has not found in this way the longitudes of many places.” Improvem ...
... of longitude of these places after small well-known corrections are made. Prior to this, lunar eclipses were used, but as Cassini (ibid.) noted, “… these eclipses are not frequent enough, and they are so difficult to observe that one has not found in this way the longitudes of many places.” Improvem ...
Article PDF - IOPscience
... Point-spread function (PSF) photometry of the individual prereduced images of G11 supplied by the STScI pipeline was performed with HSTphot (Dolphin 2000), a photometry package specifically designed to handle the undersampled PSF of the WFPC2/HST data. A number of initial pre-processing steps are re ...
... Point-spread function (PSF) photometry of the individual prereduced images of G11 supplied by the STScI pipeline was performed with HSTphot (Dolphin 2000), a photometry package specifically designed to handle the undersampled PSF of the WFPC2/HST data. A number of initial pre-processing steps are re ...
RApid Temporal Survey-RATS I: Overview and first results
... These systems are at the short period end of the period distribution of white dwarf-white dwarf binaries, or AM CVn systems. For orbital periods less than 80 min, the secondary (mass donating) star cannot be a main sequence star. Further, for periods shorter than 30 min, the secondary must be a Heli ...
... These systems are at the short period end of the period distribution of white dwarf-white dwarf binaries, or AM CVn systems. For orbital periods less than 80 min, the secondary (mass donating) star cannot be a main sequence star. Further, for periods shorter than 30 min, the secondary must be a Heli ...
Maximizing the ExoEarth Candidate Yield from a Future Direct
... for the desired exposure time. We ignore mission scheduling constraints and realtime costbased decision making that are included in more complex “mission execution simulators” (e.g., Savransky et al. 2010). However, the yield maximization methods described below run rapidly (∼ few seconds on a singl ...
... for the desired exposure time. We ignore mission scheduling constraints and realtime costbased decision making that are included in more complex “mission execution simulators” (e.g., Savransky et al. 2010). However, the yield maximization methods described below run rapidly (∼ few seconds on a singl ...
The Strikingly Uniform, Highly Turbulent Interstellar Medium of the
... awarded 8.1h in bands 7 and 8 to study the red-shifted 157.7µm (2 P3/2 → 2 P1/2 ) fine-structure transition of ionized carbon, [C ii], and the underlying dust continuum emission in a sample of Hot DOGs spanning a range of redshifts and luminosities. Observations of W2246-0526, the first galaxy of th ...
... awarded 8.1h in bands 7 and 8 to study the red-shifted 157.7µm (2 P3/2 → 2 P1/2 ) fine-structure transition of ionized carbon, [C ii], and the underlying dust continuum emission in a sample of Hot DOGs spanning a range of redshifts and luminosities. Observations of W2246-0526, the first galaxy of th ...
HERE
... eastern limb. We could just as easily have placed the vertical cross hair in front of the Sun and noted the instant when the Sun caught-up to it. In that case we would have imaged the western limb. It doesn’t matter which limb you use, just that you know which one it was. The picture is therefore an ...
... eastern limb. We could just as easily have placed the vertical cross hair in front of the Sun and noted the instant when the Sun caught-up to it. In that case we would have imaged the western limb. It doesn’t matter which limb you use, just that you know which one it was. The picture is therefore an ...
Full text - FNWI (Science) Education Service Centre
... not all of the planet-crossing comets were ejected. Some comets did not gain enough energy to be lost to the ISM but instead were perturbed onto orbits with very large semi-major axes. Their perihelion distances however, remained within the planetary orbits. This means that, although the comet will ...
... not all of the planet-crossing comets were ejected. Some comets did not gain enough energy to be lost to the ISM but instead were perturbed onto orbits with very large semi-major axes. Their perihelion distances however, remained within the planetary orbits. This means that, although the comet will ...
Regents Earth Science Curriculum
... The Key Ideas The key ideas are broad, unifying, general statements that represent knowledge within a domain. They represent a thematic or conceptual body of knowledge of what students should know. The Performance Objectives The Performance Indicators are derived from the Key Ideas in the Core Curri ...
... The Key Ideas The key ideas are broad, unifying, general statements that represent knowledge within a domain. They represent a thematic or conceptual body of knowledge of what students should know. The Performance Objectives The Performance Indicators are derived from the Key Ideas in the Core Curri ...
Sample assessment material | PDF 2.6 MB - Edexcel
... 70 countries working to help people of all ages to make measurable progress in their lives through learning. We put the learner at the centre of everything we do, because wherever learning flourishes, so do people. Find out more about how we can help you and your learners at qualifications.pearson.c ...
... 70 countries working to help people of all ages to make measurable progress in their lives through learning. We put the learner at the centre of everything we do, because wherever learning flourishes, so do people. Find out more about how we can help you and your learners at qualifications.pearson.c ...
Spot sizes on Sun-like stars
... 6 in Table 2) are taken from Henry et al. (1995), Rodonò et al. (2000) and Padmakar & Pandey (1999) and are labelled H+, R+ and PP, respectively, in column 7. The covering fractions derived from photometry by Henry et al. (1995) are lower limits as they have used the maximum light level during each ...
... 6 in Table 2) are taken from Henry et al. (1995), Rodonò et al. (2000) and Padmakar & Pandey (1999) and are labelled H+, R+ and PP, respectively, in column 7. The covering fractions derived from photometry by Henry et al. (1995) are lower limits as they have used the maximum light level during each ...
Combined Earth-/Star-Sensor for Attitude and Orbit Determination of
... The subject of this work is a sensor for autonomous attitude and orbit determination of satellites, based on active pixel technology as it has been proposed in the patent on a „Combined Earth-/ Star-Sensor System and Method for Determining the Orbit and Position of Spacecraft“ developed at Daimler-C ...
... The subject of this work is a sensor for autonomous attitude and orbit determination of satellites, based on active pixel technology as it has been proposed in the patent on a „Combined Earth-/ Star-Sensor System and Method for Determining the Orbit and Position of Spacecraft“ developed at Daimler-C ...