Accuracy of spectroscopy-based radioactive dating of stars
... sample of stars, and would as such be very valuable as a test of the theoretical stellar isochrones. Although potentially effective, spectroscopy-based radioactive dating is difficult to apply. The most easily measured longlived radioactive element, thorium, is only accessible (with the exception of st ...
... sample of stars, and would as such be very valuable as a test of the theoretical stellar isochrones. Although potentially effective, spectroscopy-based radioactive dating is difficult to apply. The most easily measured longlived radioactive element, thorium, is only accessible (with the exception of st ...
Unit 2―The Stars and Their Diurnal Motion
... 8. The Stars. From the very beginning of a study in astronomy, and as frequently as possible, students should practice watching the stars by night, to become acquainted with the constellations and their movements. To get started in your night time viewing, you should have printed out the maps and ch ...
... 8. The Stars. From the very beginning of a study in astronomy, and as frequently as possible, students should practice watching the stars by night, to become acquainted with the constellations and their movements. To get started in your night time viewing, you should have printed out the maps and ch ...
Telluric Line Removal in Astrophysical Spectroscopy
... not affected by the motion of the Earth around the Sun. The object’s lines will shift according to the Doppler Effect, being blue shifted slightly when the Earth moves toward the object, and red shifted when the Earth moves away. Since the telluric lines do not shift wavelengths, this motion around ...
... not affected by the motion of the Earth around the Sun. The object’s lines will shift according to the Doppler Effect, being blue shifted slightly when the Earth moves toward the object, and red shifted when the Earth moves away. Since the telluric lines do not shift wavelengths, this motion around ...
Have You Seen Canopus Tonight?
... bright looking stars as Rigel (900 light years?) or Deneb (1,000 light years?) are more distant. Nevertheless, this still makes Canopus a splendid and imposing star as we shall see. We know, too, that Canopus is receding from us at a typical stellar clip of 21 kilometers (13 miles) per second, or ab ...
... bright looking stars as Rigel (900 light years?) or Deneb (1,000 light years?) are more distant. Nevertheless, this still makes Canopus a splendid and imposing star as we shall see. We know, too, that Canopus is receding from us at a typical stellar clip of 21 kilometers (13 miles) per second, or ab ...
Course Materials - Weber State University
... FACULTY! what caused the seasons. Clearly, this would not be interesting if they all got it right. In fact, nearly everyone got it wrong. This has led to consternation and dismay in the scientific community. Myself, I wonder how much of that was just due to the fact that people hadn't thought about ...
... FACULTY! what caused the seasons. Clearly, this would not be interesting if they all got it right. In fact, nearly everyone got it wrong. This has led to consternation and dismay in the scientific community. Myself, I wonder how much of that was just due to the fact that people hadn't thought about ...
The star-forming content of the W3 giant molecular cloud
... distribution in the detected clump sample depends somewhat on assumptions of dust temperature and is not a simple, single power law but contains significant structure at intermediate masses. This structure is likely to be due to crowding of sources near or below the spatial resolution of the observa ...
... distribution in the detected clump sample depends somewhat on assumptions of dust temperature and is not a simple, single power law but contains significant structure at intermediate masses. This structure is likely to be due to crowding of sources near or below the spatial resolution of the observa ...
RXTE PCA Contributions to Monitoring Fast Transients
... During transient decays the disk goes through instabilities (flux bounces). Perhaps interaction with the pulsar and the magnetosphere are involved. Other instabilities besides the thermal-viscous disk instability may cause the flips between quiescence and steady accretion. Several sources have had v ...
... During transient decays the disk goes through instabilities (flux bounces). Perhaps interaction with the pulsar and the magnetosphere are involved. Other instabilities besides the thermal-viscous disk instability may cause the flips between quiescence and steady accretion. Several sources have had v ...
PDF
... For normal mass MACHOs, rE >> Rstar, but for mPBH in the PBH DM window (10-‐12 < mPBH < 10-‐7 Solar mass), rE < Rstar, so the effective tube radius becomes the projected radius of the st ...
... For normal mass MACHOs, rE >> Rstar, but for mPBH in the PBH DM window (10-‐12 < mPBH < 10-‐7 Solar mass), rE < Rstar, so the effective tube radius becomes the projected radius of the st ...
Ch 33) Astrophysics and Cosmology
... seem to be organized into even larger aggregates: clusters of clusters of galaxies, or superclusters. The farthest detectable galaxies are more than 1010 ly distant. See Table 33–1 (top of next page). 2.5 m (= 100 inches) refers to the diameter of the curved objective mirror. The bigger the mirror, ...
... seem to be organized into even larger aggregates: clusters of clusters of galaxies, or superclusters. The farthest detectable galaxies are more than 1010 ly distant. See Table 33–1 (top of next page). 2.5 m (= 100 inches) refers to the diameter of the curved objective mirror. The bigger the mirror, ...
WORD - Astrophysics
... J-band magnitude of 25.2 and thus be hard to detect against the glare of the Sun. However, when relatively young, gas giant planets radiate away excess energy from their formation and are thus self-luminous, making them potentially much easier to detect. For example, at 1 Gyr, a 5 Jupiter-mass (MJ) ...
... J-band magnitude of 25.2 and thus be hard to detect against the glare of the Sun. However, when relatively young, gas giant planets radiate away excess energy from their formation and are thus self-luminous, making them potentially much easier to detect. For example, at 1 Gyr, a 5 Jupiter-mass (MJ) ...
Extrasolar planets - Astronomisk Ungdom
... As mentioned above a macula can disappear and reappear. However, planets do not vanish from their orbit without a trace or a caveat, except if it is a free planet passing the star, but those are rare and not yet accurately proven. All work around extra solar planets is fairly new and current. At pre ...
... As mentioned above a macula can disappear and reappear. However, planets do not vanish from their orbit without a trace or a caveat, except if it is a free planet passing the star, but those are rare and not yet accurately proven. All work around extra solar planets is fairly new and current. At pre ...
16 Test Review ppt! - Goshen Community Schools
... If our sun were to become a black hole tomorrow, what would happen to the earth’s orbit around the sun? ...
... If our sun were to become a black hole tomorrow, what would happen to the earth’s orbit around the sun? ...
Oxygen and Neon Abundances of B-Type Stars in Comparison with
... not necessarily adequate from the viewpoint of precisely investigating star Sun differential oxygen abundances, because the abundances were established mostly from O II lines1 (particularly seen in the spectra of early-B stars), and were directly compared with the solar oxygen abundance (based on ...
... not necessarily adequate from the viewpoint of precisely investigating star Sun differential oxygen abundances, because the abundances were established mostly from O II lines1 (particularly seen in the spectra of early-B stars), and were directly compared with the solar oxygen abundance (based on ...
photosphere
... • Region of sun’s atmosphere just above the photosphere • Visible, UV, and X-ray lines ...
... • Region of sun’s atmosphere just above the photosphere • Visible, UV, and X-ray lines ...
Chapter 1
... The constellation of Orion is one of the most discernable patterns in the northern hemisphere, and has acted as an important beacon for generations throughout history. Orion stands central in many mythological tales. One of my personal favorites describes the figure of Orion, the hunter, standing by ...
... The constellation of Orion is one of the most discernable patterns in the northern hemisphere, and has acted as an important beacon for generations throughout history. Orion stands central in many mythological tales. One of my personal favorites describes the figure of Orion, the hunter, standing by ...
A Search for Exozodiacal Dust and Faint Companions near Sirius
... detected photometrically by spatially resolving the critical regions less than 10 AU from nearby stars. Coronagraphic images can also reveal faint companions to nearby stars. Such companions can go undetected by radial velocity surveys because of their small masses or long orbital periods. Both Siri ...
... detected photometrically by spatially resolving the critical regions less than 10 AU from nearby stars. Coronagraphic images can also reveal faint companions to nearby stars. Such companions can go undetected by radial velocity surveys because of their small masses or long orbital periods. Both Siri ...
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.