Slide 1
... Proper motion of LMC has even been measured by Kalivayalil et al and remeasured (same data) by us. QSO’s in every field. ...
... Proper motion of LMC has even been measured by Kalivayalil et al and remeasured (same data) by us. QSO’s in every field. ...
astrocoursespring2012lec5-1-1
... Extra-galactic Standard candle - a particular type of exploding star known as a type Ia Supernova. These objects are thought to occur in binary systems when a white dwarf star, orbiting around a red giant companion from which it is "gobbling up" matter because of its strong gravitational pull, is pu ...
... Extra-galactic Standard candle - a particular type of exploding star known as a type Ia Supernova. These objects are thought to occur in binary systems when a white dwarf star, orbiting around a red giant companion from which it is "gobbling up" matter because of its strong gravitational pull, is pu ...
1 Introduction - University of Amsterdam
... compact helium core is revealed it is identified as a Wolf-Rayet star. The supernova progenitor state (at the top of the diagram) determines the characteristics of the final explosion and therefore also the nature of the compact object that is left behind. It is not only mass that governs the evolut ...
... compact helium core is revealed it is identified as a Wolf-Rayet star. The supernova progenitor state (at the top of the diagram) determines the characteristics of the final explosion and therefore also the nature of the compact object that is left behind. It is not only mass that governs the evolut ...
unit1-19
... most of them!) we detect a change in their spectral lines towards lower frequencies and longer wavelengths. We call it a “Red Shift”. Light from most galaxies and stars is “red shifted”, so scientists believe that the Universe is expanding. This is strong evidence for The Big Bang Theory, coming up ...
... most of them!) we detect a change in their spectral lines towards lower frequencies and longer wavelengths. We call it a “Red Shift”. Light from most galaxies and stars is “red shifted”, so scientists believe that the Universe is expanding. This is strong evidence for The Big Bang Theory, coming up ...
Our Galaxy, The Milky Way
... Pop. I: young stars in the (thin) disk, open clusters Pop. II: old stars in the bulge, halo, and globular clusters – Today, we distinguish between the old, metal-rich stars in the bulge, and old, metal-poor stars in the halo – Not clear whether the Pop. I is homogeneous: young thin disk, vs. interme ...
... Pop. I: young stars in the (thin) disk, open clusters Pop. II: old stars in the bulge, halo, and globular clusters – Today, we distinguish between the old, metal-rich stars in the bulge, and old, metal-poor stars in the halo – Not clear whether the Pop. I is homogeneous: young thin disk, vs. interme ...
exam 3 review lecture
... A neutron star spins very rapidly about its axis, thanks to the conservation of angular momentum If the neutron star has a magnetic field, this field can form jets of electromagnetic radiation escaping from the star ...
... A neutron star spins very rapidly about its axis, thanks to the conservation of angular momentum If the neutron star has a magnetic field, this field can form jets of electromagnetic radiation escaping from the star ...
astrophysics - Collegiate Quiz Bowl Packet
... 14. Of the 26 brightest stars in the sky, it has the largest absolute magnitude of –8.1, due to it being over 1000 light years away. Also known as Algebar, it is a triple star system, but the other two can only be viewed with telescopes. This star ranks seventh behind Capella in visual brightness. I ...
... 14. Of the 26 brightest stars in the sky, it has the largest absolute magnitude of –8.1, due to it being over 1000 light years away. Also known as Algebar, it is a triple star system, but the other two can only be viewed with telescopes. This star ranks seventh behind Capella in visual brightness. I ...
charts_set_9
... Solar System Rotation Curve: when almost all mass at center, velocity decreases with radius ("Keplerian") ...
... Solar System Rotation Curve: when almost all mass at center, velocity decreases with radius ("Keplerian") ...
printer-friendly version of benchmark
... astronomy. When students find themselves reading values recorded as millions of kilometers, Astronomical Units (A.U.), and light years, they often have no basis of comparison. In such circumstances, it may be natural to assume that the smaller number represents a closer distance and the larger numbe ...
... astronomy. When students find themselves reading values recorded as millions of kilometers, Astronomical Units (A.U.), and light years, they often have no basis of comparison. In such circumstances, it may be natural to assume that the smaller number represents a closer distance and the larger numbe ...
sachkov_2013 - Putting A Stars into Context
... continuous ground based, continuous space based) ...
... continuous ground based, continuous space based) ...
Close-by young isolated neutron stars (and black holes)
... These sources are hot. The M7 sources are hot, too, but they seem to belong to different populations. This can be explained by accreted envelopes in CCOs (Kaminker et al. 2006). It is necessary to make a general population synthesis, which would include all types of isolated NSs. ...
... These sources are hot. The M7 sources are hot, too, but they seem to belong to different populations. This can be explained by accreted envelopes in CCOs (Kaminker et al. 2006). It is necessary to make a general population synthesis, which would include all types of isolated NSs. ...
ppt
... million years. Disturbance shifts the orbits of many distant comets, making them plunge into the inner solar system. A small number of those comets hit the Earth, causing the mass extinctions. ...
... million years. Disturbance shifts the orbits of many distant comets, making them plunge into the inner solar system. A small number of those comets hit the Earth, causing the mass extinctions. ...
DAY AND NIGHT, SEASONS
... for life. Alternatively, life might exist beneath the surface. For planets with an axial tilt life may only be able to survive if it migrates back and forth between cooler and hotter regions throughout its year-long day. 2: A planet with an eccentric orbit. Planets move in elliptical orbits, with t ...
... for life. Alternatively, life might exist beneath the surface. For planets with an axial tilt life may only be able to survive if it migrates back and forth between cooler and hotter regions throughout its year-long day. 2: A planet with an eccentric orbit. Planets move in elliptical orbits, with t ...
Notes 3 - 1 Notes 3: Formation of the solar system 3.1 Starting
... Generally hydrogen, and helium are found in atomic form (as individual atoms), though hydrogen can also be found commonly as H2, it is usually most often observed in the galaxy as H I (neutral atomic form). Hydrogen and helium are thought to be originally from the Big Bang rather than as by-products ...
... Generally hydrogen, and helium are found in atomic form (as individual atoms), though hydrogen can also be found commonly as H2, it is usually most often observed in the galaxy as H I (neutral atomic form). Hydrogen and helium are thought to be originally from the Big Bang rather than as by-products ...
Introduction
... simultaneous thorium-argon lamp observation (see, e.g., Konacki et al. 2003c) and an Iodine absorption cell (see, e.g., Cumming, Marcy, & Butler 1999 and references therein). While the Iodine cell is placed into the path of the star signal, before entering the spectrograph (and thus reducing the sig ...
... simultaneous thorium-argon lamp observation (see, e.g., Konacki et al. 2003c) and an Iodine absorption cell (see, e.g., Cumming, Marcy, & Butler 1999 and references therein). While the Iodine cell is placed into the path of the star signal, before entering the spectrograph (and thus reducing the sig ...
Project 3. Colour in Astronomy
... M50, but most of the dimmer, red stars do not. M50 lies about 3000 light-years from Earth and is about 20 light years across. Magnitude is a number that measures the brightness of a star or galaxy. In magnitude, higher numbers correspond to fainter objects, lower numbers to brighter objects; the ver ...
... M50, but most of the dimmer, red stars do not. M50 lies about 3000 light-years from Earth and is about 20 light years across. Magnitude is a number that measures the brightness of a star or galaxy. In magnitude, higher numbers correspond to fainter objects, lower numbers to brighter objects; the ver ...
X-ray output should be time variable
... Bright stars in the spectral range earlier than about B3 are soft X-ray sources, with LX ~ 10-7 LBol THEORY •O star X-ray emission comes from shock-heated gas present in their stellar winds; for B stars, the situation is more uncertain, and their Xrays may be related to magnetic fields, at least in ...
... Bright stars in the spectral range earlier than about B3 are soft X-ray sources, with LX ~ 10-7 LBol THEORY •O star X-ray emission comes from shock-heated gas present in their stellar winds; for B stars, the situation is more uncertain, and their Xrays may be related to magnetic fields, at least in ...
SMMP_BISANA - Infinity and Beyond
... Young stars emit jets of intense radiation that heat the surrounding matter to the point at which it glows brightly. These narrowly-focused jets can be trillions of miles long and can travel at 500,000 miles per hour. These jets may be focused by the star's magnetic field. The protostar is now a st ...
... Young stars emit jets of intense radiation that heat the surrounding matter to the point at which it glows brightly. These narrowly-focused jets can be trillions of miles long and can travel at 500,000 miles per hour. These jets may be focused by the star's magnetic field. The protostar is now a st ...
PowerPoint
... • Nearest star is 4 x 1013 km away (more than 5000x distance to Pluto) or around 4 light years. The Alpha Centauri triple system– the closest being Proxima. • Walking time: 1 billion years • Fastest space probes (Voyagers 1 & 2, Pioneers 10 & 11) – 60,000 years at about 3.6 AU/year. ...
... • Nearest star is 4 x 1013 km away (more than 5000x distance to Pluto) or around 4 light years. The Alpha Centauri triple system– the closest being Proxima. • Walking time: 1 billion years • Fastest space probes (Voyagers 1 & 2, Pioneers 10 & 11) – 60,000 years at about 3.6 AU/year. ...
Three Coordinate Systems
... as a time going east – 0 to 24 hours is 360o “Prime meridian” – point where sun is located at the vernal equinox (spring) (called vernal equinoctial colure) ...
... as a time going east – 0 to 24 hours is 360o “Prime meridian” – point where sun is located at the vernal equinox (spring) (called vernal equinoctial colure) ...
Three Coordinate Systems
... as a time going east – 0 to 24 hours is 360o “Prime meridian” – point where sun is located at the vernal equinox (spring) (called vernal equinoctial colure) ...
... as a time going east – 0 to 24 hours is 360o “Prime meridian” – point where sun is located at the vernal equinox (spring) (called vernal equinoctial colure) ...
Bright versus Nearby Stars
... are more luminous than the Sun. • The average absolute magnitude of a bright star is –1.2, equivalent to 300 solar luminosities. ...
... are more luminous than the Sun. • The average absolute magnitude of a bright star is –1.2, equivalent to 300 solar luminosities. ...
IK Pegasi
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.