Variable Star Spectroscopy 2008
... due to temperature and pressure and the velocity (both along the line of site and rotational) of the objects or the material that they consist of, which can be measured by the red or blue Doppler shift. Here the tiny 50A part of the Vega spectrum containing the Hydrogen alpha line (which is equivale ...
... due to temperature and pressure and the velocity (both along the line of site and rotational) of the objects or the material that they consist of, which can be measured by the red or blue Doppler shift. Here the tiny 50A part of the Vega spectrum containing the Hydrogen alpha line (which is equivale ...
Stars part 1
... 2. Luminosity – the total amount of energy a star radiates each second. Stars of a magnitude greater than +6.0 are too dim to be seen without optical aide. Stars of a magnitude greater than +9.0 are too dim to be seen using small telescopes or binoculars. The sun has a magnitude of – 26. ...
... 2. Luminosity – the total amount of energy a star radiates each second. Stars of a magnitude greater than +6.0 are too dim to be seen without optical aide. Stars of a magnitude greater than +9.0 are too dim to be seen using small telescopes or binoculars. The sun has a magnitude of – 26. ...
Discovery of the First Eclipsing Binary Barium Star
... be about 0.007 magnitude, he wncluded that 6 stars of the sample (which containd 17 M u m showed v&ations at or above the 3 o level. All stars were however obsened less than a dozen times under very different o b m I n g conditions and no lightcum is provided. Our more accurate photometric mwtitorln ...
... be about 0.007 magnitude, he wncluded that 6 stars of the sample (which containd 17 M u m showed v&ations at or above the 3 o level. All stars were however obsened less than a dozen times under very different o b m I n g conditions and no lightcum is provided. Our more accurate photometric mwtitorln ...
Nearby Stars - How far away is it
... Arcturus and Vega. Closer examination finds that Capella is actually four stars organized as two binary systems. Castor - 49.8 light years Castor is actually three sets of binary systems with some bright yellow and some dim red stars. Hipparcos Since 1838, many astronomers have spent decades measuri ...
... Arcturus and Vega. Closer examination finds that Capella is actually four stars organized as two binary systems. Castor - 49.8 light years Castor is actually three sets of binary systems with some bright yellow and some dim red stars. Hipparcos Since 1838, many astronomers have spent decades measuri ...
X-Ray Astronomy and Accretion Phenomena
... • Low Mass X-ray Binaries (LMXB) • High Mass X-ray Binary (HMXB) • Low & High labels the mass of the companion star (the mass donor) and not the accretor. ...
... • Low Mass X-ray Binaries (LMXB) • High Mass X-ray Binary (HMXB) • Low & High labels the mass of the companion star (the mass donor) and not the accretor. ...
Astrometric Reference Frame Science
... tied to the optically astrometric determined positions of the stars in the binary. The system consists of a K1 III giant primary with MV = 4.15 and a companion that is unseen in both photometric and spectroscopic observations. The radio emission as measured with VLBI shows a double-lobed structure w ...
... tied to the optically astrometric determined positions of the stars in the binary. The system consists of a K1 III giant primary with MV = 4.15 and a companion that is unseen in both photometric and spectroscopic observations. The radio emission as measured with VLBI shows a double-lobed structure w ...
Astrophysics notes
... define the term ‘resolution’ as the minimum angular separation between two equal point sources such that they can be just barely distinguished as separate sources define the term ‘sensitivity’ of a telescope as the light-gathering power of the telescope (directly proportional to the square of the di ...
... define the term ‘resolution’ as the minimum angular separation between two equal point sources such that they can be just barely distinguished as separate sources define the term ‘sensitivity’ of a telescope as the light-gathering power of the telescope (directly proportional to the square of the di ...
Volume XXVI - Royal Asiatic Society
... mansions, known in China 4,500 years ago. It covers a quarter of the zodiac occupying approximately the position of the constellations, Virgo, Libra and Scorpio. The fifth of its seven asterisms is Sim 心 the heart of the dragon containing three stars : the central one is Tai Wha 太火 Big Fire, which m ...
... mansions, known in China 4,500 years ago. It covers a quarter of the zodiac occupying approximately the position of the constellations, Virgo, Libra and Scorpio. The fifth of its seven asterisms is Sim 心 the heart of the dragon containing three stars : the central one is Tai Wha 太火 Big Fire, which m ...
Galactic Evolution:
... typically assumed. There are models with quick pre-enrichment. This includes pre-galactic enrichment, or protogalactic processes, or preenrichment from other more evolved system. ...
... typically assumed. There are models with quick pre-enrichment. This includes pre-galactic enrichment, or protogalactic processes, or preenrichment from other more evolved system. ...
Chapter 10. Stellar Spectra
... in the atmospheres of almost all stars. Note that Helium also has two ionization states. In its neutral state (HeI) it has 2 electrons. It can lose one of those, in which case it becomes HeII, or singly ionized Helium. We see lines of HeI in B stars, which are hotter than A stars, but not as hot as ...
... in the atmospheres of almost all stars. Note that Helium also has two ionization states. In its neutral state (HeI) it has 2 electrons. It can lose one of those, in which case it becomes HeII, or singly ionized Helium. We see lines of HeI in B stars, which are hotter than A stars, but not as hot as ...
How Old is the Universe?
... For the meteorites, the oldest are 4.56 billion years old. This very well determined age is the age of the Solar System. ...
... For the meteorites, the oldest are 4.56 billion years old. This very well determined age is the age of the Solar System. ...
The Milky Way`s Spiral Arms
... • Blue light is scattered more • Red light is transmitted more • This is why the sky is blue • Stars seen through dust appear redder than they really are • If we want to try to see through dust, what kind of light should we use? ...
... • Blue light is scattered more • Red light is transmitted more • This is why the sky is blue • Stars seen through dust appear redder than they really are • If we want to try to see through dust, what kind of light should we use? ...
Powerpoint
... Larger size than satellite dish (fainter objects and better angular resolution) The metal mirror is not as smooth as an optical mirror, but it is larger Reason – long wavelength ...
... Larger size than satellite dish (fainter objects and better angular resolution) The metal mirror is not as smooth as an optical mirror, but it is larger Reason – long wavelength ...
Lecture Eleven (Powerpoint format)
... Kip went to work on the problem and actually worked out the details using relativity theory. He suggested that wormholes might work. Intringued, Thorne picked up the wormhole problem over the next several years and began pursuing it as an active research project. Inspired by his bold lead on s ...
... Kip went to work on the problem and actually worked out the details using relativity theory. He suggested that wormholes might work. Intringued, Thorne picked up the wormhole problem over the next several years and began pursuing it as an active research project. Inspired by his bold lead on s ...
P7 Further Physics : Observing the Universe
... celestial objects: motions of stars, planets, and the Moon; measuring distances to stars and galaxies using both parallax and variable stars called Cepheids; star temperatures; the expansion of the Universe and the Hubble constant. • Inside stars explores classical physics that helps explain how sta ...
... celestial objects: motions of stars, planets, and the Moon; measuring distances to stars and galaxies using both parallax and variable stars called Cepheids; star temperatures; the expansion of the Universe and the Hubble constant. • Inside stars explores classical physics that helps explain how sta ...
Chapter 17 Measuring the Stars
... • Stellar lifetimes depend on mass; the more the mass, the shorter the lifetime ...
... • Stellar lifetimes depend on mass; the more the mass, the shorter the lifetime ...
Considerations about LIRIS MOS observations
... Appendix. Tips for a good mask design for LIRIS MOS. The LIRIS field of view covers 4x4 arcmin2 with a pixel scale of 0.25”. The maximum number of slitlets is around 25. Observing technique: Given the high and variable sky emission contamination, observations in the near infrared range need frequen ...
... Appendix. Tips for a good mask design for LIRIS MOS. The LIRIS field of view covers 4x4 arcmin2 with a pixel scale of 0.25”. The maximum number of slitlets is around 25. Observing technique: Given the high and variable sky emission contamination, observations in the near infrared range need frequen ...
jackie822 beanerbutt777 life cycle of a star
... The nebula is a cloud of gas and dust. It is not yet a star. ...
... The nebula is a cloud of gas and dust. It is not yet a star. ...
Chapter 15: The Deaths of Massive Stars
... 5. Because of greater core temperatures and pressures, supergiants produce heavier elements, such as neon, silicon, and iron. 15-2 Type II Supernovae 1. Type II supernovae, which result from massive stars, reveal prominent hydrogen lines. They are powered by gravitational energy that is released as ...
... 5. Because of greater core temperatures and pressures, supergiants produce heavier elements, such as neon, silicon, and iron. 15-2 Type II Supernovae 1. Type II supernovae, which result from massive stars, reveal prominent hydrogen lines. They are powered by gravitational energy that is released as ...
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.