Stellar Parallax
... Mapping of the Sky • It is important to be able to determine the position of an object in the Sky.This can be done in various ways. • Here we see the Celestial sphere.The stars are set on the surface of a huge sphere centred on the Earth.The point in the sky directly overhead is called the Zenith a ...
... Mapping of the Sky • It is important to be able to determine the position of an object in the Sky.This can be done in various ways. • Here we see the Celestial sphere.The stars are set on the surface of a huge sphere centred on the Earth.The point in the sky directly overhead is called the Zenith a ...
Support worksheet – Topic 3 Questions
... Suggest why the stellar parallax method is limited to distances of about 300 pc for Earth-based telescopes but can be extended to 1000 pc for satellite-based telescopes. ...
... Suggest why the stellar parallax method is limited to distances of about 300 pc for Earth-based telescopes but can be extended to 1000 pc for satellite-based telescopes. ...
STUDY GUIDE FOR CHAPTER 1
... What ways can you generate heat in a star to keep the pressure up? What happens to nuclear fusion rates as the temperature increases? Why do more massive stars go through each phase of their life in a shorter time than less massive stars? F. What is electron degeneracy pressure? Why will it only hol ...
... What ways can you generate heat in a star to keep the pressure up? What happens to nuclear fusion rates as the temperature increases? Why do more massive stars go through each phase of their life in a shorter time than less massive stars? F. What is electron degeneracy pressure? Why will it only hol ...
Slide 1
... M13 Globular Cluster We calculated the age to be between 12 to 14 billion years old It is 25,000 light years away from Earth ...
... M13 Globular Cluster We calculated the age to be between 12 to 14 billion years old It is 25,000 light years away from Earth ...
Review for Exam 2
... 5) How long does it take for stars and planets to be born? 6) What is a brown dwarf? How does it change over 6me? 7) What is the boundary in mass between stars and brown dwarfs? 8) What 3 ...
... 5) How long does it take for stars and planets to be born? 6) What is a brown dwarf? How does it change over 6me? 7) What is the boundary in mass between stars and brown dwarfs? 8) What 3 ...
What are the Spectral Lines? - University of Texas Astronomy Home
... - real knowledge only due to hard facts, e.g., laboratory science, measurements • claimed ...
... - real knowledge only due to hard facts, e.g., laboratory science, measurements • claimed ...
Evidence for a signature of the galactic bar in the solar neighbourhood
... ment of the models with the COBE/DIRBE data), u of the order of 20 km s−1 are obtained, in agreement with the observations reported in Fig. 1. Fig. 6 is a slice cutting of Fig. 5 for φ = 30◦ . The values of u have been averaged within bins of 200 Myr time width. One obtains a significantly positive ...
... ment of the models with the COBE/DIRBE data), u of the order of 20 km s−1 are obtained, in agreement with the observations reported in Fig. 1. Fig. 6 is a slice cutting of Fig. 5 for φ = 30◦ . The values of u have been averaged within bins of 200 Myr time width. One obtains a significantly positive ...
The Temperature of Stars
... – Stars moving toward Earth are shifted slightly toward blue, which is called blue shift. – Stars moving away from Earth are shifted slightly toward red, which is called red shift. ...
... – Stars moving toward Earth are shifted slightly toward blue, which is called blue shift. – Stars moving away from Earth are shifted slightly toward red, which is called red shift. ...
Characterizing Stars - Department of Physics and Astronomy
... apparent shift of a star against the background stars observed as the Earth moves along its orbit • Parallax measurements made from orbit, above the blurring effects of the atmosphere, are much more accurate than those made with Earth-based telescopes • Stellar parallaxes can only be measured for st ...
... apparent shift of a star against the background stars observed as the Earth moves along its orbit • Parallax measurements made from orbit, above the blurring effects of the atmosphere, are much more accurate than those made with Earth-based telescopes • Stellar parallaxes can only be measured for st ...
Slide 1
... • Mass - hard to figure out, but there are binary stars • Age - exact age is hard, but can estimate ...
... • Mass - hard to figure out, but there are binary stars • Age - exact age is hard, but can estimate ...
Topic 4 Assignment - Science 9 Portfolio
... from two different places. Astronomers use a star’s parallax to determine what angles to use when they triangulate the star’s distance from the Earth. The larger the baseline, the more accurate the result. The longest baseline that astronomers can use is the diameter of Earth’s orbit. Measurements h ...
... from two different places. Astronomers use a star’s parallax to determine what angles to use when they triangulate the star’s distance from the Earth. The larger the baseline, the more accurate the result. The longest baseline that astronomers can use is the diameter of Earth’s orbit. Measurements h ...
Day 1: How to Describe the Sky The Motions of the Stars
... • B: Because stars move during the year. • C: Because as Earth orbits the Sun, we see the Sun in front of different ...
... • B: Because stars move during the year. • C: Because as Earth orbits the Sun, we see the Sun in front of different ...
the size and structure of the universe
... Over 100 planets have been found OUTSIDE OF OUR SOLAR SYSTEM, orbiting other stars (called EXTRASOLAR PLANETS) ...
... Over 100 planets have been found OUTSIDE OF OUR SOLAR SYSTEM, orbiting other stars (called EXTRASOLAR PLANETS) ...
Observing
... North Pole of the Earth is pointed at Polaris (the North or Pole star), which stays stationary as the other stars move around it ...
... North Pole of the Earth is pointed at Polaris (the North or Pole star), which stays stationary as the other stars move around it ...
Distance
... European Space Agency Launched in 1989 Designed to measure precision parallaxes to about ±0.001 arcseconds! • Gets distances good out to 1000 pc • Measured parallaxes for ~100,000 stars! ...
... European Space Agency Launched in 1989 Designed to measure precision parallaxes to about ±0.001 arcseconds! • Gets distances good out to 1000 pc • Measured parallaxes for ~100,000 stars! ...
the solar neighborhood. xi. the trigonometric parallax of scr
... used; details of these are shown in Table 2. These also provide a 9 yr baseline, ideal for measuring an accurate proper motion. Each plate was scanned individually on SuperCOSMOS and processed using standard methods (Hambly et al. 2001b and references therein). Global astrometric plate solutions res ...
... used; details of these are shown in Table 2. These also provide a 9 yr baseline, ideal for measuring an accurate proper motion. Each plate was scanned individually on SuperCOSMOS and processed using standard methods (Hambly et al. 2001b and references therein). Global astrometric plate solutions res ...
distant stars nearby star parallax angle The principle of geometrical
... nearby stars (a small fraction of all the stars in the Milky Way, and none of the stars in any other galaxies), but it is the starting point of all other distance measurements. It is sometimes referred to as the first “rung” in the astronomical distance “ladder” that extends all the way out to close ...
... nearby stars (a small fraction of all the stars in the Milky Way, and none of the stars in any other galaxies), but it is the starting point of all other distance measurements. It is sometimes referred to as the first “rung” in the astronomical distance “ladder” that extends all the way out to close ...
Cluster and Association Members
... 2005). Extensive grids of stellar tracks covering the most important evolutionary phases and a large metallicity range are available. This method is based on the knowledge of all members of the cluster making it statistically significant. Recently, Paunzen & Netopil (2006) have summarized our current ...
... 2005). Extensive grids of stellar tracks covering the most important evolutionary phases and a large metallicity range are available. This method is based on the knowledge of all members of the cluster making it statistically significant. Recently, Paunzen & Netopil (2006) have summarized our current ...
RR animation
... RR Lyrae stars pulse in a manner similar to Cepheid variables, so the mechanism for the pulsation is thought to be similar, but the nature and histories of these stars is thought to be rather different. (The average absolute magnitude of an RR Lyrae is 0.75, only 40 or 50 times brighter than our Sun ...
... RR Lyrae stars pulse in a manner similar to Cepheid variables, so the mechanism for the pulsation is thought to be similar, but the nature and histories of these stars is thought to be rather different. (The average absolute magnitude of an RR Lyrae is 0.75, only 40 or 50 times brighter than our Sun ...
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.