17_LectureOutline
... In order to measure stellar masses in a binary star, the period and semimajor axis of the orbit must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be ...
... In order to measure stellar masses in a binary star, the period and semimajor axis of the orbit must be measured. Once this is done, Kepler’s third law gives the sum of the masses of the two stars. Then the relative speeds of the two stars can be measured using the Doppler effect; the speed will be ...
Galileo & the Telescope—Sept 21
... fixed stars, the Milky Way, nebulous stars, but especially about the four planets flying around the star of Jupiter at unequal intervals and periods with wonderful swiftness; which unknown by anyone until this day, the first author detected recently and decided to name Midicean Stars. Venice ...
... fixed stars, the Milky Way, nebulous stars, but especially about the four planets flying around the star of Jupiter at unequal intervals and periods with wonderful swiftness; which unknown by anyone until this day, the first author detected recently and decided to name Midicean Stars. Venice ...
The Sky
... • The week is also tied to astronomy: – Weeks are an invention of the Babylonians, loosely based on quarter of lunar cycle. – Number of days in week equals number of “planets” (non-stationary celestial objects) – Seven objects in the sky move relative to the stars: Sun, Moon, Mercury, Venus, Mars, J ...
... • The week is also tied to astronomy: – Weeks are an invention of the Babylonians, loosely based on quarter of lunar cycle. – Number of days in week equals number of “planets” (non-stationary celestial objects) – Seven objects in the sky move relative to the stars: Sun, Moon, Mercury, Venus, Mars, J ...
Slide 1
... In 1998 astronomers discovered that very distant type 1a supernovae were further away than expected. Measurement of their red shifts (used to measure their velocities) and the use of Hubble’s Law to obtain their distances shows that these supernovae are fainter than expected. These mesurements indic ...
... In 1998 astronomers discovered that very distant type 1a supernovae were further away than expected. Measurement of their red shifts (used to measure their velocities) and the use of Hubble’s Law to obtain their distances shows that these supernovae are fainter than expected. These mesurements indic ...
Radial Stellar Pulsations
... will consider oscillating stars. We begin with the simplest but perhaps most important case: radial pulsators. These stars remain spherically symmetric, though not hydrostatic.1 Two important classes of radial pulsators are RR Lyrae and delta Cepheid variables. (The term “variable” can be applied to ...
... will consider oscillating stars. We begin with the simplest but perhaps most important case: radial pulsators. These stars remain spherically symmetric, though not hydrostatic.1 Two important classes of radial pulsators are RR Lyrae and delta Cepheid variables. (The term “variable” can be applied to ...
So, what`s the problem for high
... coupling between gas and dust is too weak for dust cooling. They only become unstable with help from a compression, as happens in galactic collisions. ...
... coupling between gas and dust is too weak for dust cooling. They only become unstable with help from a compression, as happens in galactic collisions. ...
Draft Science Cases for KPAO
... 5. Stellar and Galactic Astronomy 6. Extragalactic Astronomy Appendix. Extrasolar Planetary Systems. Material to be incorporated. ...
... 5. Stellar and Galactic Astronomy 6. Extragalactic Astronomy Appendix. Extrasolar Planetary Systems. Material to be incorporated. ...
13.1 Introduction 13.2 The Red Giant Branch
... Table 13.1 gives some representative values for the sizes and luminosities of red giant stars; a main sequence G V star may end up as a high-K or low-M luminosity class III giant. Note that the values in Table 13.1 depend largely on the spectral type, and not on the mass: stars of a wide range of ma ...
... Table 13.1 gives some representative values for the sizes and luminosities of red giant stars; a main sequence G V star may end up as a high-K or low-M luminosity class III giant. Note that the values in Table 13.1 depend largely on the spectral type, and not on the mass: stars of a wide range of ma ...
Slide 1
... complicated and very huge place. We are a very, very, very small part in the grand scope of things. You need to have a very solid understanding of the major principles of our universe to be able to relate the correct information to your students. Questions that often come up, but are not on our stan ...
... complicated and very huge place. We are a very, very, very small part in the grand scope of things. You need to have a very solid understanding of the major principles of our universe to be able to relate the correct information to your students. Questions that often come up, but are not on our stan ...
2012年雅思阅读考试考前冲刺试题（1）
... 11.答案：orbiting (第12段第1句：Since the discovery in 1995 of the first "exoplanet" - a planet orbiting a star other than the Sun - more than 200 others have been found by ground-based observatories.) 12.答案：harbour life (第13段：Until now the usual method of finding exoplanets has been to detect the "wobble" ...
... 11.答案：orbiting (第12段第1句：Since the discovery in 1995 of the first "exoplanet" - a planet orbiting a star other than the Sun - more than 200 others have been found by ground-based observatories.) 12.答案：harbour life (第13段：Until now the usual method of finding exoplanets has been to detect the "wobble" ...
Here - Astrophysics Research Institute
... As the earth rotates, stars (like the sun) rise in the east, pass over the meridian (transit), and set in the west. The hour angle tells you how long it will be before the star transits (or how much time has passed since it transited!) • Hour Angle - angle between a star's current position and the m ...
... As the earth rotates, stars (like the sun) rise in the east, pass over the meridian (transit), and set in the west. The hour angle tells you how long it will be before the star transits (or how much time has passed since it transited!) • Hour Angle - angle between a star's current position and the m ...
Far Ultraviolet Spectroscopic Explorer
... Individual objects show a variety of characteristics that do not always track the “standard model.” Collectively, SNRs can affect star formation and galactic evolution ...
... Individual objects show a variety of characteristics that do not always track the “standard model.” Collectively, SNRs can affect star formation and galactic evolution ...
discover the wonders above
... At -224°C Uranus is the coldest planet in our Solar System. Although Neptune is further away from the Sun it generates 2.61 times more energy than it receives, keeping it slightly warmer. ...
... At -224°C Uranus is the coldest planet in our Solar System. Although Neptune is further away from the Sun it generates 2.61 times more energy than it receives, keeping it slightly warmer. ...
Unit 3 - Section 9.7 2011 Universe Origin
... wavelengths of the spectral lines are shifted to higher values (i.e., red) than they would have been were the star stationary or moving side to side (neither towards nor away from us). This shifting is known as a Doppler shift. By measuring the shift in wavelength, the speed of movement away (red) o ...
... wavelengths of the spectral lines are shifted to higher values (i.e., red) than they would have been were the star stationary or moving side to side (neither towards nor away from us). This shifting is known as a Doppler shift. By measuring the shift in wavelength, the speed of movement away (red) o ...
How Stars Work: Ay 122 - Fall 2004 - Lecture 7
... An isolated, non-rotating star which does not contain strong magnetic fields will be spherically symmetric, i.e.: All quantities (e.g. density, temperature, pressure) depend only on the distance from the center of the star - radius r. Not a general property of all self-gravitating systems - e.g. an ...
... An isolated, non-rotating star which does not contain strong magnetic fields will be spherically symmetric, i.e.: All quantities (e.g. density, temperature, pressure) depend only on the distance from the center of the star - radius r. Not a general property of all self-gravitating systems - e.g. an ...
Standing in Awe - Auckland Astronomical Society
... 1859. From a maximum of magnitude 4.9, delta falls to magnitude 5.9 in 6 hours. The period of this system is 2.327 days. The primary star, an A-type or perhaps B9.5 main sequence star, has a mass around 2.6 times greater and shines 80 times brighter than our Sun. The secondary star, possibly a G-typ ...
... 1859. From a maximum of magnitude 4.9, delta falls to magnitude 5.9 in 6 hours. The period of this system is 2.327 days. The primary star, an A-type or perhaps B9.5 main sequence star, has a mass around 2.6 times greater and shines 80 times brighter than our Sun. The secondary star, possibly a G-typ ...
Angular size and resolution - RIT Center for Imaging Science
... • Can distinguish shapes and shading of light of objects with angular sizes of a few arcminutes • Rule of Thumb: angular resolution of unaided eye is 1 arcminute ...
... • Can distinguish shapes and shading of light of objects with angular sizes of a few arcminutes • Rule of Thumb: angular resolution of unaided eye is 1 arcminute ...
A Jupiter-mass companion to a solar-type star
... The presence of a Jupiter-mass companion to the star 51 Pegasi is inferred from observations of periodic variations in the star's radial velocity. The companion lies only about eight million kilometres from the star, which would be well inside the orbit of Mercury in our Solar System. This object mi ...
... The presence of a Jupiter-mass companion to the star 51 Pegasi is inferred from observations of periodic variations in the star's radial velocity. The companion lies only about eight million kilometres from the star, which would be well inside the orbit of Mercury in our Solar System. This object mi ...
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.