Celestial Navitation - National University of Singapore
... was frequent during the reign of Alexander the Great as his vast empire included territories of both countries. China’s Han Dynasty as well as the Roman Empire also had regular trade relations. Early explorers had some idea of their final destination before they set sail. Although they were searchin ...
... was frequent during the reign of Alexander the Great as his vast empire included territories of both countries. China’s Han Dynasty as well as the Roman Empire also had regular trade relations. Early explorers had some idea of their final destination before they set sail. Although they were searchin ...
Astrometric accuracy during the past 2000 years
... The evolution has often been displayed in diagrams, showing the accuracy versus time. These diagrams have at least one thing in common, the improvement by many powers of ten from the one degree of Hipparchus, the Greek father of astronomy, to one milliarcsec for the diagrams including the Hipparcos ...
... The evolution has often been displayed in diagrams, showing the accuracy versus time. These diagrams have at least one thing in common, the improvement by many powers of ten from the one degree of Hipparchus, the Greek father of astronomy, to one milliarcsec for the diagrams including the Hipparcos ...
1998 - Universitäts-Sternwarte München
... regardless of the metal abundance. On the base of these data, spectroscopic parallaxes are calculated and compared to the Hipparcos astrometry to explore the reliability of the derived stellar parameters, notably the surface gravity and metal abundance scale. The spectroscopic distance scale is foun ...
... regardless of the metal abundance. On the base of these data, spectroscopic parallaxes are calculated and compared to the Hipparcos astrometry to explore the reliability of the derived stellar parameters, notably the surface gravity and metal abundance scale. The spectroscopic distance scale is foun ...
Digital Universe Guide - American Museum of Natural History
... This book is designed for the reader who wants to be an expert on the ways of the Digital Universe with Partiview. Inside these pages, in gross detail, are the specifics of each data set, how it may be used to tell stories about the Universe, and how to manipulate these data to illustrate scientific ...
... This book is designed for the reader who wants to be an expert on the ways of the Digital Universe with Partiview. Inside these pages, in gross detail, are the specifics of each data set, how it may be used to tell stories about the Universe, and how to manipulate these data to illustrate scientific ...
act_science_bellringers
... 29. Based on Fact 5 and Student 1’s discussion, which of the 3 stars in the Algol system, if any, was most likely the first to become an MS star? A. Algol A B. Algol B C. Algol C D. The 3 stars became MS stars at the same time. 30. Based on Fact 5, would Student 2 agree that by the time Algol A stop ...
... 29. Based on Fact 5 and Student 1’s discussion, which of the 3 stars in the Algol system, if any, was most likely the first to become an MS star? A. Algol A B. Algol B C. Algol C D. The 3 stars became MS stars at the same time. 30. Based on Fact 5, would Student 2 agree that by the time Algol A stop ...
SAGE_prop
... Zank, 2006) and define the astropause, the boundary between the influence of the star and the surrounding ISM (analogous to the Heliopause for the Sun). Variations in the cosmic ray flux may have an influence on planetary climate (e.g. Kirkby and Carslaw, 2006). Stellar winds are also a route for th ...
... Zank, 2006) and define the astropause, the boundary between the influence of the star and the surrounding ISM (analogous to the Heliopause for the Sun). Variations in the cosmic ray flux may have an influence on planetary climate (e.g. Kirkby and Carslaw, 2006). Stellar winds are also a route for th ...
SPICA Yellow Book
... of distant galaxies; however, its relatively warm telescope (between 82 and 90 K) greatly limits its sensitivity. A new much more sensitive mission reaching must therefore build on the work started by Herschel and gain a deeper understanding of the physics of the objects discovered there: i.e., to s ...
... of distant galaxies; however, its relatively warm telescope (between 82 and 90 K) greatly limits its sensitivity. A new much more sensitive mission reaching must therefore build on the work started by Herschel and gain a deeper understanding of the physics of the objects discovered there: i.e., to s ...
Chapter 10 Formation and evolution of the Local Group
... Summary: The Local Group (LG) is the group of galaxies gravitationally associated with the Galaxy and M 31. Galaxies within the LG have overcome the general expansion of the universe. There are approximately 75 galaxies in the LG within a diameter of ∼3 Mpc having a total mass of 2-5 × 1012 M⊙ . A s ...
... Summary: The Local Group (LG) is the group of galaxies gravitationally associated with the Galaxy and M 31. Galaxies within the LG have overcome the general expansion of the universe. There are approximately 75 galaxies in the LG within a diameter of ∼3 Mpc having a total mass of 2-5 × 1012 M⊙ . A s ...
Characterization and Subtraction of Well
... ghosts caused by the optics in the NIC2 images. The first, evident in most of the targets and in all four filters, is a large ring of diameter 50 that is usually found near the bottom of the field. The ring appears to be a highly defocused reflection of the target star, and its location is very sens ...
... ghosts caused by the optics in the NIC2 images. The first, evident in most of the targets and in all four filters, is a large ring of diameter 50 that is usually found near the bottom of the field. The ring appears to be a highly defocused reflection of the target star, and its location is very sens ...
The connection between stellar activity cycles and magnetic field
... magnetic map reconstructed using ZDI and an activity cycle period determination in the literature. Their physical parameters are listed in table 1. To calculate Rossby numbers, we use the rotation periods as listed by Vidotto et al. (2014) and convective turnover times were calculated using the meth ...
... magnetic map reconstructed using ZDI and an activity cycle period determination in the literature. Their physical parameters are listed in table 1. To calculate Rossby numbers, we use the rotation periods as listed by Vidotto et al. (2014) and convective turnover times were calculated using the meth ...
Stars: HR Diagaram Stellar Evolution Astronomy 1 — Elementary Astronomy LA Mission College
... Independently in 1913 American astronomer Henry Norris Russell plotted spectral class against absolute magnitude ...
... Independently in 1913 American astronomer Henry Norris Russell plotted spectral class against absolute magnitude ...
IAU GA, Prague, Aug 2006 - Spanish Virtual Observatory
... • Building a census of substellar objects implies the discovery of a statistically significant number of them through queries that combine attributes available from different archives. • This is an approach out of the scope of the "classical" methodology but that perfectly fits into the Virtual Obse ...
... • Building a census of substellar objects implies the discovery of a statistically significant number of them through queries that combine attributes available from different archives. • This is an approach out of the scope of the "classical" methodology but that perfectly fits into the Virtual Obse ...
The Milky Way as a galaxy
... thus larger distances, became possible with the astrometric satellite Hipparcos. It operated between November 1989 and March 1993 and measured the positions and trigonometric parallaxes of about 120 000 bright stars, with a precision of 0:00 001 for the brighter targets. With Hipparcos the method ...
... thus larger distances, became possible with the astrometric satellite Hipparcos. It operated between November 1989 and March 1993 and measured the positions and trigonometric parallaxes of about 120 000 bright stars, with a precision of 0:00 001 for the brighter targets. With Hipparcos the method ...
X-ray emission from supernova shock waves Tanja Kramer Nymark Department of Astronomy
... The field of supernova research is a quite new one, compared with astronomy in general – it is only about eighty years since astronomers first became aware that some of the “new stars” which occasionally appeared were far too energetic to be understood in the context of what was at the time known ab ...
... The field of supernova research is a quite new one, compared with astronomy in general – it is only about eighty years since astronomers first became aware that some of the “new stars” which occasionally appeared were far too energetic to be understood in the context of what was at the time known ab ...
McDonald I....Tisserand, P. et al ExELS an
... approach, based on version 1106 of the Besanc¸on population synthesis Galaxy model (Robin et al. 2003), which incorporates a three-dimensional dust model to compute extinction and reddening (Marshall et al. 2005). The populations included in the model are such that stars are limited to between 0.08 ...
... approach, based on version 1106 of the Besanc¸on population synthesis Galaxy model (Robin et al. 2003), which incorporates a three-dimensional dust model to compute extinction and reddening (Marshall et al. 2005). The populations included in the model are such that stars are limited to between 0.08 ...
Standardized Test Prep Chapter 30 Multiple Choice, continued
... the main-sequence stage. During this stage, energy continues to be generated in the core of the star as hydrogen fuses into helium. • A star that has a mass about the same as the sun’s mass stays on the main sequence for about 10 billion years. • Scientists estimate that over a period of almost 5 bi ...
... the main-sequence stage. During this stage, energy continues to be generated in the core of the star as hydrogen fuses into helium. • A star that has a mass about the same as the sun’s mass stays on the main sequence for about 10 billion years. • Scientists estimate that over a period of almost 5 bi ...
Chapter 30 - Todd County Schools
... the main-sequence stage. During this stage, energy continues to be generated in the core of the star as hydrogen fuses into helium. • A star that has a mass about the same as the sun’s mass stays on the main sequence for about 10 billion years. • Scientists estimate that over a period of almost 5 bi ...
... the main-sequence stage. During this stage, energy continues to be generated in the core of the star as hydrogen fuses into helium. • A star that has a mass about the same as the sun’s mass stays on the main sequence for about 10 billion years. • Scientists estimate that over a period of almost 5 bi ...
A physical interpretation of the `red Sirius` anomaly
... 2 T H E E V O L U T I O N A R Y S TAT U S O F T H E SIRIUS SYSTEM Sirius A and B form a unique pair. The 2.1-M( primary is one of the earliest known main-sequence stars to exist in a binary system containing a white dwarf, and the main-sequence progenitor of the 1.0-M( secondary must have been even ...
... 2 T H E E V O L U T I O N A R Y S TAT U S O F T H E SIRIUS SYSTEM Sirius A and B form a unique pair. The 2.1-M( primary is one of the earliest known main-sequence stars to exist in a binary system containing a white dwarf, and the main-sequence progenitor of the 1.0-M( secondary must have been even ...
1. Uranus and Neptune
... Sun. Then came the discovery of Neptune, the eighth planet. But something was still wrong with the orbit of Uranus. Could yest another planet lurk unseen in the distant reaches of the Solar System, and could such a planet be affecting the orbit of Uranus? The first part of the question was answered ...
... Sun. Then came the discovery of Neptune, the eighth planet. But something was still wrong with the orbit of Uranus. Could yest another planet lurk unseen in the distant reaches of the Solar System, and could such a planet be affecting the orbit of Uranus? The first part of the question was answered ...
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.