HD 140283: A Star in the Solar Neighborhood that Formed Shortly
... We made FGS observations of HD 140283 at 11 epochs between 2003 August and 2011 March, at dates close to the biannual times of maximum parallax factor. The FGS are interferometers that, in addition to providing guiding control during imaging or spectroscopic observations, can measure precise positio ...
... We made FGS observations of HD 140283 at 11 epochs between 2003 August and 2011 March, at dates close to the biannual times of maximum parallax factor. The FGS are interferometers that, in addition to providing guiding control during imaging or spectroscopic observations, can measure precise positio ...
What is a star? A star is a giant ball of gases held together by gravity
... When the temperature reaches ten million degrees Celsius, a chemical change called nuclear fusion begins to take place. In this change, two atoms of hydrogen gas combine, or fuse together, to form an atom of helium gas. This chemical change gives off a large amount of energy in the form of heat. Thi ...
... When the temperature reaches ten million degrees Celsius, a chemical change called nuclear fusion begins to take place. In this change, two atoms of hydrogen gas combine, or fuse together, to form an atom of helium gas. This chemical change gives off a large amount of energy in the form of heat. Thi ...
Balmer lines
... alpha absorption line at 656.260 instead of 656.277 nm. This means that Sirius is moving towards us at 7.7km/s ...
... alpha absorption line at 656.260 instead of 656.277 nm. This means that Sirius is moving towards us at 7.7km/s ...
Powerpoint file 2.5 MB
... beams for pulsar or SETI searches. The remaining part of the telescope is more sparsely covered (with positions calculated from a simple grading function) to give good imaging resolution. ...
... beams for pulsar or SETI searches. The remaining part of the telescope is more sparsely covered (with positions calculated from a simple grading function) to give good imaging resolution. ...
GenGeoAstroII_Stars
... Newton’s Laws tell us that it is the mass inside the radius of the sun that determines its velocity The more mass there is inside the orbit, the faster the sun has to orbit around the Galactic center (argument similar to Kepler’s III. ...
... Newton’s Laws tell us that it is the mass inside the radius of the sun that determines its velocity The more mass there is inside the orbit, the faster the sun has to orbit around the Galactic center (argument similar to Kepler’s III. ...
doc - University of Texas Astronomy
... Italian-Dutch BeppoSAX satellite) to see the xray “afterglow” from a gamma ray burst to locate its position in the sky more accurately, and then see spectral lines in its optical “afterglow.” The resulting Doppler shift was a redshift and it was enormous. As we’ll see later, because the universe is ...
... Italian-Dutch BeppoSAX satellite) to see the xray “afterglow” from a gamma ray burst to locate its position in the sky more accurately, and then see spectral lines in its optical “afterglow.” The resulting Doppler shift was a redshift and it was enormous. As we’ll see later, because the universe is ...
History of astronomy
... The accuracy of Tycho's best positional measurements was +/- 1 arc minute. This was an improvement of a factor of 10 over previous observations. If the stars were closer than 3438 Astronomical Units, Tycho should have been able to measure their trigonometric parallaxes. But he found no parallax for ...
... The accuracy of Tycho's best positional measurements was +/- 1 arc minute. This was an improvement of a factor of 10 over previous observations. If the stars were closer than 3438 Astronomical Units, Tycho should have been able to measure their trigonometric parallaxes. But he found no parallax for ...
Mercury_Orbit_Lab_1_(better_than_2)
... the year. The scale below the orbit is marked in astronomical units and will enable you to make measurements on the diagram in astronomical units. The Sun is represented by the dot at the center of the Earth's orbit. As you draw on the diagram use a sharp pencil; sharp so you can be accurate, and pe ...
... the year. The scale below the orbit is marked in astronomical units and will enable you to make measurements on the diagram in astronomical units. The Sun is represented by the dot at the center of the Earth's orbit. As you draw on the diagram use a sharp pencil; sharp so you can be accurate, and pe ...
Distances in Astronomy
... radius is at a distance of 1 parsec. One parsec is about 3.26 light-years (the distance that light travels in one year), or 30,856,780,000,000 km. C. How Apparent Brightness Relates to Distance Imagine that a lamp illuminates a painting on a wall, and provides exactly the right amount of light. The ...
... radius is at a distance of 1 parsec. One parsec is about 3.26 light-years (the distance that light travels in one year), or 30,856,780,000,000 km. C. How Apparent Brightness Relates to Distance Imagine that a lamp illuminates a painting on a wall, and provides exactly the right amount of light. The ...
Barium Stars Observed with the Coude Echelle Spectrometer
... Nevertheless, the CES/reticon system is very efficient and versatile, and it makes much fun to work with it. High-quality spectra call for adequate analytical techniques. Most of the earlier analyses of Ba stars employed curveof-grawth methods. Furthermore, most oscillator strengths available at tha ...
... Nevertheless, the CES/reticon system is very efficient and versatile, and it makes much fun to work with it. High-quality spectra call for adequate analytical techniques. Most of the earlier analyses of Ba stars employed curveof-grawth methods. Furthermore, most oscillator strengths available at tha ...
WorldWide Telescope: Sky Mode
... Science Tools for Data-Intensive Astronomy: A Standards-Based Approach to using Astronomical Data in the Classroom with Microsoft’s WorldWide Telescope ...
... Science Tools for Data-Intensive Astronomy: A Standards-Based Approach to using Astronomical Data in the Classroom with Microsoft’s WorldWide Telescope ...
Slide 1 - Beverley High School
... • At the bottom right the stars are cool. These low mass stars are very long lived as they use their fuel so slowly. Very low mass M stars live many billions of years and will simply run out of fuel without dramatic events. ...
... • At the bottom right the stars are cool. These low mass stars are very long lived as they use their fuel so slowly. Very low mass M stars live many billions of years and will simply run out of fuel without dramatic events. ...
as Word doc - Virtual Observatory
... Science Tools for Data-Intensive Astronomy: A Standards-Based Approach to using Astronomical Data in the Classroom with Microsoft’s WorldWide Telescope ...
... Science Tools for Data-Intensive Astronomy: A Standards-Based Approach to using Astronomical Data in the Classroom with Microsoft’s WorldWide Telescope ...
The Metric System
... planets in the Solar System. One AU is defined as the average distance from Sun to Earth … 149,600,000 km ...
... planets in the Solar System. One AU is defined as the average distance from Sun to Earth … 149,600,000 km ...
A New Variable Star in Perseus
... Reduction of observations were made with IRAF (Image Reduction and Analysis Facilities) packages (Massey & Davis 1992). Magnitude measurements of the stars were carried out with the digiphot-apphot packages in the IRAF. All observation points were transformed to the Heliocentric Julian Dates (HJD). ...
... Reduction of observations were made with IRAF (Image Reduction and Analysis Facilities) packages (Massey & Davis 1992). Magnitude measurements of the stars were carried out with the digiphot-apphot packages in the IRAF. All observation points were transformed to the Heliocentric Julian Dates (HJD). ...
Renaissance Astronomy
... The accuracy of Tycho's best positional measurements was +/- 1 arc minute. This was an improvement of a factor of 10 over previous observations. If the stars were closer than 3438 Astronomical Units, Tycho should have been able to measure their trigonometric parallaxes. But he found no parallax for ...
... The accuracy of Tycho's best positional measurements was +/- 1 arc minute. This was an improvement of a factor of 10 over previous observations. If the stars were closer than 3438 Astronomical Units, Tycho should have been able to measure their trigonometric parallaxes. But he found no parallax for ...
What is a scientific model?
... the velocities of falling bodies are not proportional to their weights; showing that the path of a projectile is a parabola; building the first astronomical telescope; coming up with the ideas behind Newton's laws of motion; and confirming the Copernican theory of the solar system. He was denounced ...
... the velocities of falling bodies are not proportional to their weights; showing that the path of a projectile is a parabola; building the first astronomical telescope; coming up with the ideas behind Newton's laws of motion; and confirming the Copernican theory of the solar system. He was denounced ...
Chapter 10: The Interstellar Medium - Otto
... star light is reflected by the dust; reflection nebulae appear blue because blue light is scattered by larger angles than red light; the same phenomenon makes the day sky appear blue (if it’s not ...
... star light is reflected by the dust; reflection nebulae appear blue because blue light is scattered by larger angles than red light; the same phenomenon makes the day sky appear blue (if it’s not ...
Measuring colour in astronomy
... Astronomers are very interested in the colour of a star because it indicates how hot the outer surface of its atmosphere is, and this tells them a lot about the type of star. To measure the brightness at different wavelengths, filters are used, each of which only lets through light of a certain colo ...
... Astronomers are very interested in the colour of a star because it indicates how hot the outer surface of its atmosphere is, and this tells them a lot about the type of star. To measure the brightness at different wavelengths, filters are used, each of which only lets through light of a certain colo ...
That star is an M-dwarf, smaller, dimmer and cooler than our sun. So
... closer to its sun than Mercury does to our sun, it is still safely located in a habitable zone. (12) Many scientists have thought that life couldn’t develop near M-dwarf stars. This is because they give off more damaging radiation than G-type stars like our sun. Kepler-186f, however, appears to sit ...
... closer to its sun than Mercury does to our sun, it is still safely located in a habitable zone. (12) Many scientists have thought that life couldn’t develop near M-dwarf stars. This is because they give off more damaging radiation than G-type stars like our sun. Kepler-186f, however, appears to sit ...
Science Pre-test Presentation
... During what season is your shadow the shortest? The shadow is shortest in summer because the Sun is higher in the sky. ...
... During what season is your shadow the shortest? The shadow is shortest in summer because the Sun is higher in the sky. ...
Powerpoint - Astronomy at Swarthmore College
... material is moving towards or away from the observer, who is positioned in the top center of the image. Blue corresponds to material moving towards the observer (which would be blueshifted), while red corresponds to material moving away from the observer (red-shifted). Black contours indicate materi ...
... material is moving towards or away from the observer, who is positioned in the top center of the image. Blue corresponds to material moving towards the observer (which would be blueshifted), while red corresponds to material moving away from the observer (red-shifted). Black contours indicate materi ...
Slide 1
... Separate day and night vision detectors: o Cones for color vision during the day o Rods for low-light monochromatic vision Redundant system Stereoscopic Rangefinding system Powerful image processing and object identification system connected ...
... Separate day and night vision detectors: o Cones for color vision during the day o Rods for low-light monochromatic vision Redundant system Stereoscopic Rangefinding system Powerful image processing and object identification system connected ...
675 x 4.5” Reflector Telescope
... about astronomy. The first thing you need to do is get a very simple star chart and a flashlight with a red bulb or red cellophane over the end. For objects other than stars and constellations, a basic guide to astronomy is a must. Some recommended sources appear on our website at www.bushnell.com. ...
... about astronomy. The first thing you need to do is get a very simple star chart and a flashlight with a red bulb or red cellophane over the end. For objects other than stars and constellations, a basic guide to astronomy is a must. Some recommended sources appear on our website at www.bushnell.com. ...
Beyond Our Solar System
... In this figure, your field of view widens by a factor of 100, and you can see an area 1 mile in diameter. – The arrow points to the scene shown in the preceding photo. – People, trees, and sidewalks have vanished, but now you can see a college campus and the surrounding streets and houses. – The di ...
... In this figure, your field of view widens by a factor of 100, and you can see an area 1 mile in diameter. – The arrow points to the scene shown in the preceding photo. – People, trees, and sidewalks have vanished, but now you can see a college campus and the surrounding streets and houses. – The di ...
International Ultraviolet Explorer
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.