The Time of Perihelion Passage and the Longitude of Perihelion of
... If Nemesis, a hypothetical solar companion star, periodically passes through the asteroid belt, it should have perturbed the orbits of the planets substantially, especially near times of perihelion passage. Yet almost no such perturbations have been detected. This can be explained if Nemesis is comp ...
... If Nemesis, a hypothetical solar companion star, periodically passes through the asteroid belt, it should have perturbed the orbits of the planets substantially, especially near times of perihelion passage. Yet almost no such perturbations have been detected. This can be explained if Nemesis is comp ...
Clusters: age scales for stellar physics
... In order to define an age scale (or several), it is very important to keep in mind that we cannot make experiments except in very few situations and we rely on observations and theory. Thus, observational phenomena with very well defined ages, our anchors, are extremely important. As a matter of fac ...
... In order to define an age scale (or several), it is very important to keep in mind that we cannot make experiments except in very few situations and we rely on observations and theory. Thus, observational phenomena with very well defined ages, our anchors, are extremely important. As a matter of fac ...
on the pms star hbc 498 and its associated nebulous stars1
... program stars, assuming a distance to the complex of 460 pc (= Orion’s SFR distance) we are able to estimate their principal stellar parameters as follows: 3.3.1. Stars with uvby-β Photometry i) We dereddened the photometry with an interstellar extinction law adequate for star-forming regions (Terra ...
... program stars, assuming a distance to the complex of 460 pc (= Orion’s SFR distance) we are able to estimate their principal stellar parameters as follows: 3.3.1. Stars with uvby-β Photometry i) We dereddened the photometry with an interstellar extinction law adequate for star-forming regions (Terra ...
Astronomy 150 The Planets
... At the upper right, and lower left corner of the images is a black dot that represents the size of a 10 km craters on the image. Use this as a guide to determine the size if the craters on the image. Follow these steps for each of the four images: • Count the total number of craters larger than 10 k ...
... At the upper right, and lower left corner of the images is a black dot that represents the size of a 10 km craters on the image. Use this as a guide to determine the size if the craters on the image. Follow these steps for each of the four images: • Count the total number of craters larger than 10 k ...
Biosignatures and Planetary Properties to be
... Earth-like planets evolving around stars of very different spectral type than the Sun, hence different spectral energy distribution, might evolve in unexpected ways (and, for K and M dwarfs, over much longer time spans than could our Earth. The ill-fated namesake of Shakespeare's play Hamlet admonis ...
... Earth-like planets evolving around stars of very different spectral type than the Sun, hence different spectral energy distribution, might evolve in unexpected ways (and, for K and M dwarfs, over much longer time spans than could our Earth. The ill-fated namesake of Shakespeare's play Hamlet admonis ...
Stellar astrophysics based on interferometry
... AMBER: Near-Infrared (J, H, K; 1-2.5 mm) 3-way beam combiner. Spectal resolution R=30 (low resolution), 1500 (medium r.), 12000 (high r.). VLTI instruments and their operation are designed along the same lines of VLT instruments, in particular for what concerns standards, operation, data management. ...
... AMBER: Near-Infrared (J, H, K; 1-2.5 mm) 3-way beam combiner. Spectal resolution R=30 (low resolution), 1500 (medium r.), 12000 (high r.). VLTI instruments and their operation are designed along the same lines of VLT instruments, in particular for what concerns standards, operation, data management. ...
Astronomy Assignment #1
... The sidereal day is the time required for the Earth to rotate once on its axis – 23h 56m 4.09s. The solar day is the time between successive transits of the Sun across the merdian (non-to-noon) 24 h (on average). These two “days” are not the same because as the Earth rotates through on sidereal day ...
... The sidereal day is the time required for the Earth to rotate once on its axis – 23h 56m 4.09s. The solar day is the time between successive transits of the Sun across the merdian (non-to-noon) 24 h (on average). These two “days” are not the same because as the Earth rotates through on sidereal day ...
Solutions
... The sidereal day is the time required for the Earth to rotate once on its axis – 23h 56m 4.09s. The solar day is the time between successive transits of the Sun across the merdian (non-to-noon) 24 h (on average). These two “days” are not the same because as the Earth rotates through on sidereal day ...
... The sidereal day is the time required for the Earth to rotate once on its axis – 23h 56m 4.09s. The solar day is the time between successive transits of the Sun across the merdian (non-to-noon) 24 h (on average). These two “days” are not the same because as the Earth rotates through on sidereal day ...
Pulsed Accretion in the Young Binary &
... T Tauri phases (Shu et al. 1987). WTTS are also termed 'naked' T Tauri stars as they do not have as much circumstellar material allowing us to study the conditions on the stellar surface. WTTS are moderately rapid rotators with cool spots covering 5- 40 % of their total surface. Optical and ultravio ...
... T Tauri phases (Shu et al. 1987). WTTS are also termed 'naked' T Tauri stars as they do not have as much circumstellar material allowing us to study the conditions on the stellar surface. WTTS are moderately rapid rotators with cool spots covering 5- 40 % of their total surface. Optical and ultravio ...
Small star patterns for telescopes and binoculars Demelza Ramakers
... can find The Fairy Ring a few degrees south of the star Sadr: 1.6° west of the Cresent Nebula. ...
... can find The Fairy Ring a few degrees south of the star Sadr: 1.6° west of the Cresent Nebula. ...
81 KB - CSIRO Publishing
... may initially be based on appearance to the human eye (e.g. Hubble 1926), but to make progress this taxonomy may need to have some basis in the underlying nature or physics of the objects being examined. With this mind, astronomers need a working definition so as to divide objects into different cat ...
... may initially be based on appearance to the human eye (e.g. Hubble 1926), but to make progress this taxonomy may need to have some basis in the underlying nature or physics of the objects being examined. With this mind, astronomers need a working definition so as to divide objects into different cat ...
Penn State Astronomy 11 Laboratory
... constellations, and to demonstrate nightly and annual changes in the sky. 3. The Scale of Things: How Big Is It? (page 15) — A summary of the scale of things, from the solar system to the universe, using scale models and analogies. 4. Angles, Navigation, and Data Analysis (page 21) — Celestial navig ...
... constellations, and to demonstrate nightly and annual changes in the sky. 3. The Scale of Things: How Big Is It? (page 15) — A summary of the scale of things, from the solar system to the universe, using scale models and analogies. 4. Angles, Navigation, and Data Analysis (page 21) — Celestial navig ...
Kick velocity
... The proposed mechanism is related to e- -capture SN. Such explosions can appear not only in binary systems, but in binaries they can be more frequent. Among isolated stars about 4% (up to ~20%!) of SN can be of this type (Poelarends et al. 2008). [It is not clear if they appear among normal PSRs.] W ...
... The proposed mechanism is related to e- -capture SN. Such explosions can appear not only in binary systems, but in binaries they can be more frequent. Among isolated stars about 4% (up to ~20%!) of SN can be of this type (Poelarends et al. 2008). [It is not clear if they appear among normal PSRs.] W ...
Electronic Text Book Unit 11
... vibrations. When electric current is applied to a quartz crystal, it vibrates at a regular frequency, depending on its shape and size. ...
... vibrations. When electric current is applied to a quartz crystal, it vibrates at a regular frequency, depending on its shape and size. ...
On the nature of sn stars. I. A detailed abundance study
... questioned. There is no general agreement about their origin. We aim to derive abundances for a sample of 9 stars, including sn and non-sn stars, to determine the possible relation between sn and CP stars and compare their chemical abundances. That most sn stars belong to open clusters allows us to ...
... questioned. There is no general agreement about their origin. We aim to derive abundances for a sample of 9 stars, including sn and non-sn stars, to determine the possible relation between sn and CP stars and compare their chemical abundances. That most sn stars belong to open clusters allows us to ...
CORONAL EVOLUTION OF THE SUN IN TIME: HIGH
... 1.6 Gyr and rotation periods between 1 and 12.4 days have been observed. We use the X-ray spectra to derive coronal element abundances of C, N, O, Ne, Mg, Si, S, and Fe and the coronal emission measure distribution ( EMD). We find that the abundances change from an inverse first ionization potenti ...
... 1.6 Gyr and rotation periods between 1 and 12.4 days have been observed. We use the X-ray spectra to derive coronal element abundances of C, N, O, Ne, Mg, Si, S, and Fe and the coronal emission measure distribution ( EMD). We find that the abundances change from an inverse first ionization potenti ...
Kick velocity
... The proposed mechanism is related to e- -capture SN. Such explosions can appear not only in binary systems, but in binaries they can be more frequent. Among isolated stars about 4% (up to ~20%!) of SN can be of this type (Poelarends et al. 2008). [It is not clear if they appear among normal PSRs.] W ...
... The proposed mechanism is related to e- -capture SN. Such explosions can appear not only in binary systems, but in binaries they can be more frequent. Among isolated stars about 4% (up to ~20%!) of SN can be of this type (Poelarends et al. 2008). [It is not clear if they appear among normal PSRs.] W ...
Superstars of Astronomy: Debra Fischer transcript
... Well, I think it was probably the first astronomy class that I took when I was in college. It was sort of unsettling. I remember feeling how insignificant it seemed that the Earth was in the context of the entire, well, galaxy and then the entire universe beyond that. So the scope of things was almo ...
... Well, I think it was probably the first astronomy class that I took when I was in college. It was sort of unsettling. I remember feeling how insignificant it seemed that the Earth was in the context of the entire, well, galaxy and then the entire universe beyond that. So the scope of things was almo ...
Spectral Classification: The First Step in Quantitative Spectral Analysis
... astrophysically interesting stars is also important for spectral analysis: 1) Spectral classification can identify stars worthy of further analysis 2) Knowledge that a star is peculiar in some way is of vital importance in spectral analysis, as for some peculiar stars (for instance Ap and Am stars) ...
... astrophysically interesting stars is also important for spectral analysis: 1) Spectral classification can identify stars worthy of further analysis 2) Knowledge that a star is peculiar in some way is of vital importance in spectral analysis, as for some peculiar stars (for instance Ap and Am stars) ...
Lokal fulltext - Chalmers Publication Library
... only 1.3 pc (Söderhjelm 1999) where the primary star is sometimes considered a solar twin. Simulations have shown that planetary formation is possible here despite its binary nature (see Chapter 3). The higher than normal metallicity of both stars is also in favour of existing planetary systems (Ma ...
... only 1.3 pc (Söderhjelm 1999) where the primary star is sometimes considered a solar twin. Simulations have shown that planetary formation is possible here despite its binary nature (see Chapter 3). The higher than normal metallicity of both stars is also in favour of existing planetary systems (Ma ...
