- Europhysics News
... of exoplanets forces us to reconsider the model of planetary formation currently accepted for the solar system. This model is based upon the properties of planetary orbits, mostly coplanar, circular and concentric around the Sun. Following the early concepts developed by Kant and Laplace in the 18th ...
... of exoplanets forces us to reconsider the model of planetary formation currently accepted for the solar system. This model is based upon the properties of planetary orbits, mostly coplanar, circular and concentric around the Sun. Following the early concepts developed by Kant and Laplace in the 18th ...
an all-sky extrasolar planet survey with multiple object, dispersed
... challenges for the fields of planetary origins and evolution, but also indicate that a large sample of planets is required to obtain a general understanding of the nature of extrasolar planets and their formation and evolution. Although the high-precision echelle Doppler instruments have proven quit ...
... challenges for the fields of planetary origins and evolution, but also indicate that a large sample of planets is required to obtain a general understanding of the nature of extrasolar planets and their formation and evolution. Although the high-precision echelle Doppler instruments have proven quit ...
Cepheid
... Milky Way, different from the spiral nebulae. We now realize that they are ‘dwarf’ galaxies in their own right (but not spirals). ...
... Milky Way, different from the spiral nebulae. We now realize that they are ‘dwarf’ galaxies in their own right (but not spirals). ...
Stars
... The distance of a star when it appears to shift one second of a degree due to parallax. 1 pc = 3.26 ly. ...
... The distance of a star when it appears to shift one second of a degree due to parallax. 1 pc = 3.26 ly. ...
MSWord version
... standstills (northern and southern) happening about two weeks apart. Note that everything I’ve said about moonrise also applies to moonset, but at Chimney Rock it’s the moonrise in which we’re interested! We might mention that the sunrise and sunset directions also “swing” back and forth across segm ...
... standstills (northern and southern) happening about two weeks apart. Note that everything I’ve said about moonrise also applies to moonset, but at Chimney Rock it’s the moonrise in which we’re interested! We might mention that the sunrise and sunset directions also “swing” back and forth across segm ...
Lyman-α observations of astrospheres
... stars shown in Fig. 4 can be fit by a power law, Ṁ ∝ FX1.34±0.18 , for X-ray surface fluxes FX < 106 erg cm−2 s−1 . While the fit looks good considering the roughly factor of two uncertainties in the mass-loss rate measurements and the varying X-ray fluxs that were measured at different times, ther ...
... stars shown in Fig. 4 can be fit by a power law, Ṁ ∝ FX1.34±0.18 , for X-ray surface fluxes FX < 106 erg cm−2 s−1 . While the fit looks good considering the roughly factor of two uncertainties in the mass-loss rate measurements and the varying X-ray fluxs that were measured at different times, ther ...
PowerPoint format
... Determination of the chemical enrichment history of the Galaxy and the Universe via high resolution spectroscopy of the oldest stars in the Milky Way and gas clouds illuminated by distant quasars. • High-resolution (R=50-150,000) spectroscopy of faint objects at uv-optical wavelengths ...
... Determination of the chemical enrichment history of the Galaxy and the Universe via high resolution spectroscopy of the oldest stars in the Milky Way and gas clouds illuminated by distant quasars. • High-resolution (R=50-150,000) spectroscopy of faint objects at uv-optical wavelengths ...
3.2 Spectra and Spectral Classification
... Diagram showing the relationship between (a) absolute magnitude or luminosity and (b) spectral type or effective temperature (sometimes also color index) That means there exist different forms of this diagram, usually ● log L versus spectral type ● log L versus log T ● M versus B-V ...
... Diagram showing the relationship between (a) absolute magnitude or luminosity and (b) spectral type or effective temperature (sometimes also color index) That means there exist different forms of this diagram, usually ● log L versus spectral type ● log L versus log T ● M versus B-V ...
Chapter 17 Star Stuff
... 1. Main Sequence: H fuses to He in core 2. Red Supergiant: H fuses to He in shell around He core 3. Helium Core Burning: He fuses to C in core while H fuses to He in shell 4. Multiple Shell Burning: Many elements fuse in shells ...
... 1. Main Sequence: H fuses to He in core 2. Red Supergiant: H fuses to He in shell around He core 3. Helium Core Burning: He fuses to C in core while H fuses to He in shell 4. Multiple Shell Burning: Many elements fuse in shells ...
Chapter 17 Star Stuff How does a star`s mass affect nuclear fusion
... • The mass of a main sequence star determines its core pressure and temperature • Stars of higher mass have higher core temperature and more rapid fusion, making those stars both more luminous and shorter-lived • Stars of lower mass have cooler cores and slower fusion rates, giving them smaller lumi ...
... • The mass of a main sequence star determines its core pressure and temperature • Stars of higher mass have higher core temperature and more rapid fusion, making those stars both more luminous and shorter-lived • Stars of lower mass have cooler cores and slower fusion rates, giving them smaller lumi ...
printer-friendly version of benchmark
... Students know the Sun is a medium-sized star located in the Milky Way Galaxy, part of which can be seen as a glowing band of light spanning the clear night sky. W/S Common misconceptions associated with this benchmark 1. Students have a misconception that all stars are the same size. When viewing th ...
... Students know the Sun is a medium-sized star located in the Milky Way Galaxy, part of which can be seen as a glowing band of light spanning the clear night sky. W/S Common misconceptions associated with this benchmark 1. Students have a misconception that all stars are the same size. When viewing th ...
Dark Skies - Friends of Kissimmee Prairie Preserve
... pictured above is an emission nebula located in the constellation Perseus. It is so named because it appears to resemble the outline of the US State of California on long exposure photographs. It is almost 2.5° long on the sky and, because of its very low surface brightness, it is extremely difficul ...
... pictured above is an emission nebula located in the constellation Perseus. It is so named because it appears to resemble the outline of the US State of California on long exposure photographs. It is almost 2.5° long on the sky and, because of its very low surface brightness, it is extremely difficul ...
An Eclectic View of our Milky Way Galaxy
... agrees closely with the Carlberg & Innanen result, but the methodology raises questions about its validity. It turns out there is no need to adjust the velocities of Local Group galaxies for a solution to the problem, but it is still necessary to remove M31 and its neighbouring galaxies from the sol ...
... agrees closely with the Carlberg & Innanen result, but the methodology raises questions about its validity. It turns out there is no need to adjust the velocities of Local Group galaxies for a solution to the problem, but it is still necessary to remove M31 and its neighbouring galaxies from the sol ...
The Infrared Astronomical Mission AKARI
... of view (∼ 10 arcmin) covered by the large-format arrays in these instruments makes them highly suitable for efficient surveys. AKARI has the capability to make pointed observations in addition to the All-Sky Survey, although AKARI is not a fully observatory-type mission in the same guise as the Inf ...
... of view (∼ 10 arcmin) covered by the large-format arrays in these instruments makes them highly suitable for efficient surveys. AKARI has the capability to make pointed observations in addition to the All-Sky Survey, although AKARI is not a fully observatory-type mission in the same guise as the Inf ...
ph507rev1
... parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989-1993) accurately determin ...
... parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989-1993) accurately determin ...
Section 2
... Teach Darken the room, and shine the light from the projector through the prism so that the spectrum is visible on a white surface. Use a double thickness of red cellophane to reduce the occurence of light leaks. Ask students to predict what will happen when red cellophane is held between the prism ...
... Teach Darken the room, and shine the light from the projector through the prism so that the spectrum is visible on a white surface. Use a double thickness of red cellophane to reduce the occurence of light leaks. Ask students to predict what will happen when red cellophane is held between the prism ...
lab 11 only - Penn State University
... \latitude-longitude" coordinate system, where the origin of the plot is the direction to the center of the Galaxy (which you just found the coordinates of in the RA and Dec. system). \Longitude" is measured along the plane of the Galaxy, in degrees ranging from 0 (at the center) to 180 (opposite f ...
... \latitude-longitude" coordinate system, where the origin of the plot is the direction to the center of the Galaxy (which you just found the coordinates of in the RA and Dec. system). \Longitude" is measured along the plane of the Galaxy, in degrees ranging from 0 (at the center) to 180 (opposite f ...
We Are Made of Stardust
... (Ca), and Manganese (25). Note: This is a bit of a simplification; the actual process is far more complicated, with some of the less abundant elements of these intermediate atomic weights actually formed during the decay of iron into lighter elements during the supernova phase, to be discussed next. ...
... (Ca), and Manganese (25). Note: This is a bit of a simplification; the actual process is far more complicated, with some of the less abundant elements of these intermediate atomic weights actually formed during the decay of iron into lighter elements during the supernova phase, to be discussed next. ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.