The accretion disk paradigm for young stars
... emission may have some connection with this possible infall of material”, a prophetic statement that, unfortunately, no one paid attention to. In the late 1960s, another major discovery was made by Eugenio E. Mendoza V. (1966, 1968) when he found that several TTSs and related objects had strong infr ...
... emission may have some connection with this possible infall of material”, a prophetic statement that, unfortunately, no one paid attention to. In the late 1960s, another major discovery was made by Eugenio E. Mendoza V. (1966, 1968) when he found that several TTSs and related objects had strong infr ...
Curiosities of the Sky
... stars whose actual distances apart is great, offers another quandary; persistent and sharply bordered apertures in such an assemblage are a priori as improbable, if not impossible, as straight, narrow holes running through a swarm of bees. The difficulty of these questions indicates one of the reaso ...
... stars whose actual distances apart is great, offers another quandary; persistent and sharply bordered apertures in such an assemblage are a priori as improbable, if not impossible, as straight, narrow holes running through a swarm of bees. The difficulty of these questions indicates one of the reaso ...
The Birth of a Supernova Seen in Real Time
... Figure 1 (click image for larger view) Supernovae represent the explosive death of the most massive stars in the Universe, that live fast and die young, often within just a few million years. These explosions give birth to neutron stars and black holes, and fuel galaxy evolution through the injectio ...
... Figure 1 (click image for larger view) Supernovae represent the explosive death of the most massive stars in the Universe, that live fast and die young, often within just a few million years. These explosions give birth to neutron stars and black holes, and fuel galaxy evolution through the injectio ...
Ptolemy: on trial for fraud
... and his contemporaries lacked our modern understanding of error ranges, standard deviations and the use of mean values from repeated observations – concepts that would have enabled Ptolemy to propound a theory not necessarily in total and absolute agreement with every data point obtained, but in les ...
... and his contemporaries lacked our modern understanding of error ranges, standard deviations and the use of mean values from repeated observations – concepts that would have enabled Ptolemy to propound a theory not necessarily in total and absolute agreement with every data point obtained, but in les ...
Early Star-Forming Galaxies
... 9 billion to 11 billion years ago. Scientists would particularly like to know whether a quasi-steady, long-lasting process in isolated galaxies or a more rapid, starburst mode in large, merging galaxies increased the production of stars. Recent findings from a study using Hubble and the European Sp ...
... 9 billion to 11 billion years ago. Scientists would particularly like to know whether a quasi-steady, long-lasting process in isolated galaxies or a more rapid, starburst mode in large, merging galaxies increased the production of stars. Recent findings from a study using Hubble and the European Sp ...
Downloadable Full Text
... The UFD Reticulum II (Ret II) was recently discovered with Dark Energy Survey data12,13 and confirmed to be one of the most metal-poor galaxies known14. On 1-4 Oct 2015, we obtained high-resolution spectra of the nine brightest member stars in Ret II (see Table 1, Extended Data Figure 1). The abunda ...
... The UFD Reticulum II (Ret II) was recently discovered with Dark Energy Survey data12,13 and confirmed to be one of the most metal-poor galaxies known14. On 1-4 Oct 2015, we obtained high-resolution spectra of the nine brightest member stars in Ret II (see Table 1, Extended Data Figure 1). The abunda ...
The Odin satellite`s sharp eyes in space
... cooled is therefore very important to understanding how a star comes into being. Odin will study water molecules and oxygen molecules (O2) as scientists have good reason to believe that these substances effectively radiate away heat energy, cooling their surroundings. If cooling is sufficiently effe ...
... cooled is therefore very important to understanding how a star comes into being. Odin will study water molecules and oxygen molecules (O2) as scientists have good reason to believe that these substances effectively radiate away heat energy, cooling their surroundings. If cooling is sufficiently effe ...
2_ISM - UCT Astronomy Department
... Why? The history review of history of determining shape and size of galaxies have shown the importance of dust absorption and scattering, and Rayleigh scattering in the determination of the true size of the Galaxy • distances to object in the Galaxy • mapping distances to other galaxies • determinat ...
... Why? The history review of history of determining shape and size of galaxies have shown the importance of dust absorption and scattering, and Rayleigh scattering in the determination of the true size of the Galaxy • distances to object in the Galaxy • mapping distances to other galaxies • determinat ...
Comet Observers Club Chair
... remainder are no doubt periodic as well, but their orbits have not been determined with sufficient accuracy to tell for sure. Comets are sometimes called "dirty snowballs". They are a mixture of ices (both water and frozen gases) and dust that for some reason didn't get incorporated into planets whe ...
... remainder are no doubt periodic as well, but their orbits have not been determined with sufficient accuracy to tell for sure. Comets are sometimes called "dirty snowballs". They are a mixture of ices (both water and frozen gases) and dust that for some reason didn't get incorporated into planets whe ...
Sc h o o l o f ... Head of School Degree Programmes
... programme: PH5180, PH5181, PH5182, PH5183. Erasmus Mundus Master of Science in Photonics, for those studying in St Andrews in the second year of their programme: PH5181, PH5261, PH5260 and at least 37 credits chosen from PH4025, PH5005, PH5008, PH5012, PH5015, PH5016, PH5182, PH5183. ...
... programme: PH5180, PH5181, PH5182, PH5183. Erasmus Mundus Master of Science in Photonics, for those studying in St Andrews in the second year of their programme: PH5181, PH5261, PH5260 and at least 37 credits chosen from PH4025, PH5005, PH5008, PH5012, PH5015, PH5016, PH5182, PH5183. ...
- Cosmotography
... mag), although a Z = 0.001, 10 Gyr model is consistent with the blue edge of the observed RGB. Presumably a 10 Gyr model with Z ∼ 0.002 would also be consistent with the data, while perhaps providing a better match to the observed CMD slope. We conclude that, if the bulk of the RGB stars are old (> ...
... mag), although a Z = 0.001, 10 Gyr model is consistent with the blue edge of the observed RGB. Presumably a 10 Gyr model with Z ∼ 0.002 would also be consistent with the data, while perhaps providing a better match to the observed CMD slope. We conclude that, if the bulk of the RGB stars are old (> ...
Recent science results from VLTI commissioning
... Eta Carinae: Questions & Mysteries • What was it? Yellow SG? Red SG?, WR? • What is it? Single? Binary? Cluster? What is its current mass loss rate exactly? What is its or their mass? • What will it become? Normal star after more eruptions? Collapse into SN or hypernova? • Is it rotating? What is t ...
... Eta Carinae: Questions & Mysteries • What was it? Yellow SG? Red SG?, WR? • What is it? Single? Binary? Cluster? What is its current mass loss rate exactly? What is its or their mass? • What will it become? Normal star after more eruptions? Collapse into SN or hypernova? • Is it rotating? What is t ...