![Barium Stars Observed with the Coude Echelle Spectrometer](http://s1.studyres.com/store/data/016163242_1-9ade9e42e1b1e0424dc56aa57b76a234-300x300.png)
Barium Stars Observed with the Coude Echelle Spectrometer
... The Optical Pulsar H 2252-035 (AO Psc) M. KUbiak, Warsaw University Observatory, Poland, and Hoher List Observatorium, FRG The optical counterpart of the pulsating X-ray source H 2252035 appeared to be an interesting object for optical astronomers also. In the X-ray domain it shows the same characte ...
... The Optical Pulsar H 2252-035 (AO Psc) M. KUbiak, Warsaw University Observatory, Poland, and Hoher List Observatorium, FRG The optical counterpart of the pulsating X-ray source H 2252035 appeared to be an interesting object for optical astronomers also. In the X-ray domain it shows the same characte ...
A Brief guide to the night Skies for those who know nothing
... glimpse as many as 6,000 of them, but our Galaxy, which we call "The Milky Way", probably contains ~200 billion of these great spheres of shining gas, and this is only one galaxy amongst at least 10 billion in the universe. Scattered like diamond chips across the cosmos, the stars look deceptively s ...
... glimpse as many as 6,000 of them, but our Galaxy, which we call "The Milky Way", probably contains ~200 billion of these great spheres of shining gas, and this is only one galaxy amongst at least 10 billion in the universe. Scattered like diamond chips across the cosmos, the stars look deceptively s ...
1” “Sky-Notes” of the Open University Astronomy Club. September
... Although best placed in the predawn skies Mars is now presenting a large enough disc for useful observations and imaging to be made. The rotation of Mars is about half an hour slower than that of the Earth so that observations made at the same time on successive nights show only a small change in su ...
... Although best placed in the predawn skies Mars is now presenting a large enough disc for useful observations and imaging to be made. The rotation of Mars is about half an hour slower than that of the Earth so that observations made at the same time on successive nights show only a small change in su ...
Print Activity - Let`s Talk Science
... 4. If you don’t have access to glow-in-the-dark stickers, you can cover the end of a flashlight with red cellophane and shine this on the image when you’re outside (this way you can look at the image and the night sky without losing your ‘night vision’). 5. Go outside to a dark area where you have a ...
... 4. If you don’t have access to glow-in-the-dark stickers, you can cover the end of a flashlight with red cellophane and shine this on the image when you’re outside (this way you can look at the image and the night sky without losing your ‘night vision’). 5. Go outside to a dark area where you have a ...
Unit 6 – Earth
... they are too far away, but they can detect the wobble caused by the gravitational pull of planets on a star. Distances in space are big, and are measured in light years. 1 light year is about 1016 m. The nearest star, Proxima Centauri, is 4 light years away. That means that light, travelling at 300 ...
... they are too far away, but they can detect the wobble caused by the gravitational pull of planets on a star. Distances in space are big, and are measured in light years. 1 light year is about 1016 m. The nearest star, Proxima Centauri, is 4 light years away. That means that light, travelling at 300 ...
RR animation
... and often used as standard candles to measure galactic distances. This type of variable is named after the prototype, the variable star RR Lyrae in the constellation Lyra. RR Lyraes are pulsating horizontal branch stars of spectral class A (and rarely F), with a mass of around half the Sun's. They a ...
... and often used as standard candles to measure galactic distances. This type of variable is named after the prototype, the variable star RR Lyrae in the constellation Lyra. RR Lyraes are pulsating horizontal branch stars of spectral class A (and rarely F), with a mass of around half the Sun's. They a ...
Prep/Review Questions - Faculty Web Sites at the University
... You have three eyepieces with focal lengths of 200, 100, and 20 mm to use with your telescope, which has a focal length of 1800 mm. Which eyepiece will give you an image with 90 power magnification? Which eyepiece will give you the largest “field of view”? A 16-in telescope collects how much more li ...
... You have three eyepieces with focal lengths of 200, 100, and 20 mm to use with your telescope, which has a focal length of 1800 mm. Which eyepiece will give you an image with 90 power magnification? Which eyepiece will give you the largest “field of view”? A 16-in telescope collects how much more li ...
PHYS 390 Lecture 31 - Kinematics of galaxies 31
... Galaxies assume a variety of shapes, but certainly one of the more common shapes is a spiral or pinwheel: ...
... Galaxies assume a variety of shapes, but certainly one of the more common shapes is a spiral or pinwheel: ...
2011 Exam Review
... a. A dented ping pong ball can sometimes be “repaired” by placing it in cup of hot water. b. When heated, the alloy used as solder was softer and more ductile than at colder temperatures. 4. a) State three physical properties of ethanol. b) State one chemical property of ethanol. 5. A student found ...
... a. A dented ping pong ball can sometimes be “repaired” by placing it in cup of hot water. b. When heated, the alloy used as solder was softer and more ductile than at colder temperatures. 4. a) State three physical properties of ethanol. b) State one chemical property of ethanol. 5. A student found ...
Section 5 — Earth Sciences (The Solar System) Student Edition
... observations. These ancient astronomers (scientists who study the solar system) observed the Sun moving across the sky all day long. They watched the Moon moving across the sky at night, and, sometimes even in the daytime. Their conclusion: Earth is the center of the universe. Earth at the center of ...
... observations. These ancient astronomers (scientists who study the solar system) observed the Sun moving across the sky all day long. They watched the Moon moving across the sky at night, and, sometimes even in the daytime. Their conclusion: Earth is the center of the universe. Earth at the center of ...
G485 5.5.1 Structure of the Universe
... phase, it continues to increase its surface area and eventually becomes a red super giant. Further nuclear fusion reactions occur in its collapsing core, raising the temperature to billions of Kelvin. During this stage the immense pressure causes protons to absorb electrons and become neutrons. ...
... phase, it continues to increase its surface area and eventually becomes a red super giant. Further nuclear fusion reactions occur in its collapsing core, raising the temperature to billions of Kelvin. During this stage the immense pressure causes protons to absorb electrons and become neutrons. ...
Today`s Powerpoint
... Emission Nebulae or H II Regions Regions of gas and dust near stars just formed. The Hydrogen is essentially fully ionized. Temperatures near 10,000 K ...
... Emission Nebulae or H II Regions Regions of gas and dust near stars just formed. The Hydrogen is essentially fully ionized. Temperatures near 10,000 K ...
PH709-assn-answers
... 1. Suppose that two exoplanets are observed to transit the same star. They are both in circular orbits with an inclination of 90 degrees. One produces periodic dips with a period of 4 days and the other produces periodic dips with a period of 108 days. The decrease in luminosity caused by both exopl ...
... 1. Suppose that two exoplanets are observed to transit the same star. They are both in circular orbits with an inclination of 90 degrees. One produces periodic dips with a period of 4 days and the other produces periodic dips with a period of 108 days. The decrease in luminosity caused by both exopl ...
Become a Member - Department of Physics and Astronomy
... scientists believed that the relative abundance of elements in the atmospheres of the Sun and the stars was similar to that in Earth’s crust. In 1889, geochemist Frank Wigglesworth Clarke’s The Relative Abundance of the Chemical Elements was the result of his comprehensive sampling of minerals from ...
... scientists believed that the relative abundance of elements in the atmospheres of the Sun and the stars was similar to that in Earth’s crust. In 1889, geochemist Frank Wigglesworth Clarke’s The Relative Abundance of the Chemical Elements was the result of his comprehensive sampling of minerals from ...
The Milky Way – A Classic Galaxy
... bright open cluster M23 has a Cepheid. As of 1999, 29 more clusters now known to have Cepheids. • Cepheid PL relation has much less noise if brightnesses measured in the Infrared, which is what is always done these days. • By “Cepheids” I mean “Classical Cepheids”. There are also “Type II Cepheids” ...
... bright open cluster M23 has a Cepheid. As of 1999, 29 more clusters now known to have Cepheids. • Cepheid PL relation has much less noise if brightnesses measured in the Infrared, which is what is always done these days. • By “Cepheids” I mean “Classical Cepheids”. There are also “Type II Cepheids” ...
Chapter 1 - A Modern View of the Universe
... Distance Units and Astronomy Planets: kilometers (km) (1 km ~ 0.6 mile) - i.e., Earth’s circumference is ~40,000 km Solar System: Astronomical Unit (AU) - average Earth-Sun distance = 150 million km - Venus is 0.7 AU from Sun, Mars at 1.5 AU Stars, Galaxies, Universe: light year (ly) - 9.46 trillio ...
... Distance Units and Astronomy Planets: kilometers (km) (1 km ~ 0.6 mile) - i.e., Earth’s circumference is ~40,000 km Solar System: Astronomical Unit (AU) - average Earth-Sun distance = 150 million km - Venus is 0.7 AU from Sun, Mars at 1.5 AU Stars, Galaxies, Universe: light year (ly) - 9.46 trillio ...
Shocking Truth about Massive Stars Lidia Oskinova Chandra’s First Decade of Discovery
... ’’A very energetic explosion of a massive star is likely to create a ... fireball.... the inner core of a massive, rapidly rotating star collapses into a ~10 M Kerr black hole ... A superstrong ~10 15 G magnetic field is needed to make the object ... a microquasar. Such events must be vary rare...to ...
... ’’A very energetic explosion of a massive star is likely to create a ... fireball.... the inner core of a massive, rapidly rotating star collapses into a ~10 M Kerr black hole ... A superstrong ~10 15 G magnetic field is needed to make the object ... a microquasar. Such events must be vary rare...to ...
Spectroscopy
... over a range, as do the spectra of the other elements. • The previous spectra are in the optical range of light. • Line emission can actually occur at any energy of light (i.e. visible, UV, etc. ) and with any type of ...
... over a range, as do the spectra of the other elements. • The previous spectra are in the optical range of light. • Line emission can actually occur at any energy of light (i.e. visible, UV, etc. ) and with any type of ...
Measuring the Masses of Galaxies in the Sloan Digital Sky Survey
... distance ≈ z × age of Universe (z << 1) distance ≅ [z / (1+z)] × age of Universe e.g., for z = 0.0061, d = 0.00606 × 13.5 billion = 82 million light-years caveat: redshift must represent expansion of Universe, not orbital motion ...
... distance ≈ z × age of Universe (z << 1) distance ≅ [z / (1+z)] × age of Universe e.g., for z = 0.0061, d = 0.00606 × 13.5 billion = 82 million light-years caveat: redshift must represent expansion of Universe, not orbital motion ...
An Introduction to Astronomy and Cosmology
... changed, 22 leap seconds have had to be added, about one every 18 months, but there were none between 1998 and 2005 showing the slowdown is not particularly regular. Leap seconds are somewhat of a nuisance for systems such as the Global Positioning System (GPS) Network and there is pressure to do aw ...
... changed, 22 leap seconds have had to be added, about one every 18 months, but there were none between 1998 and 2005 showing the slowdown is not particularly regular. Leap seconds are somewhat of a nuisance for systems such as the Global Positioning System (GPS) Network and there is pressure to do aw ...
Stars through the year
... moving but to the Earth spinning on its axis. Now go out at the same time on different night during the year and you will notice that the star patterns that you see in, say, June will be different from those that you see at the same time and looking in the same direction from the same place when loo ...
... moving but to the Earth spinning on its axis. Now go out at the same time on different night during the year and you will notice that the star patterns that you see in, say, June will be different from those that you see at the same time and looking in the same direction from the same place when loo ...
IK Pegasi
![](https://commons.wikimedia.org/wiki/Special:FilePath/Location_of_IK_Pegasi.png?width=300)
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.