Shortв•`lived radioactivity in the early solar system: The Superв•`AGB
... widespread in the solar system. The mass-independent fractionation effect shifts the O isotopic ratios along a line of slope approximately 1 in the O three-isotope plot (the CCAM line in Fig. 1). The physical origin of this effect is unclear and has been possibly interpreted as the imprint of CO sel ...
... widespread in the solar system. The mass-independent fractionation effect shifts the O isotopic ratios along a line of slope approximately 1 in the O three-isotope plot (the CCAM line in Fig. 1). The physical origin of this effect is unclear and has been possibly interpreted as the imprint of CO sel ...
night sky a field guide to the heavens
... things were now for the first time, if, I say, they were now suddenly presented to mortals beyond all expectation, what could have been named that would be more marvelous than these things, or that nations beforehand would less venture to believe could be? Nothing, me thinks: so wonderous strange ha ...
... things were now for the first time, if, I say, they were now suddenly presented to mortals beyond all expectation, what could have been named that would be more marvelous than these things, or that nations beforehand would less venture to believe could be? Nothing, me thinks: so wonderous strange ha ...
Red Objects in the DFBS
... • All these data can be retrieved using a dedicated WEB interface. • The spectra of the objects recorded on the plates were extracted using a catalogue driven procedure, based on the USNO-A2, cut at B=17.0 • In principle, therefore, no objects fainter than B=17 should be present in the DFBS database ...
... • All these data can be retrieved using a dedicated WEB interface. • The spectra of the objects recorded on the plates were extracted using a catalogue driven procedure, based on the USNO-A2, cut at B=17.0 • In principle, therefore, no objects fainter than B=17 should be present in the DFBS database ...
Devil physics The baddest class on campus IB Physics
... (in parsecs) = 1/p (in arcseconds), the method of spectroscopic parallax and the Cepheids method for determining distances in astronomy? Can you define the parsec? Can you state the definitions of apparent brightness, b = L/4πd2 , and apparent and absolute magnitude, b/b0 = 100-m/5 = 2.512-m? ...
... (in parsecs) = 1/p (in arcseconds), the method of spectroscopic parallax and the Cepheids method for determining distances in astronomy? Can you define the parsec? Can you state the definitions of apparent brightness, b = L/4πd2 , and apparent and absolute magnitude, b/b0 = 100-m/5 = 2.512-m? ...
How astero-seismology can help to infer properties of - IAG-Usp
... Must use all what we have : seismic and nonseismic info complementary forward and inverse info ...
... Must use all what we have : seismic and nonseismic info complementary forward and inverse info ...
Behaviour of elements from lithium to europium in stars with and
... Here, we make a few comments regarding the observational data and the techniques for determining the parameters and chemical composition. It is important that all our determinations of both parameters and chemical composition are performed using uniform methods. The spectra of investigated stars (F- ...
... Here, we make a few comments regarding the observational data and the techniques for determining the parameters and chemical composition. It is important that all our determinations of both parameters and chemical composition are performed using uniform methods. The spectra of investigated stars (F- ...
Using photometric analysis to determine characteristics of the V
... explosion that created a drastic increase in the brightness of the nova. The increase in optical brightness is due to the fact that the in‐falling matter from the companion star cause the white dwarf to approach a mass of 1.4 times that of the Sun (a mass called the Chandrasekhar limit after th ...
... explosion that created a drastic increase in the brightness of the nova. The increase in optical brightness is due to the fact that the in‐falling matter from the companion star cause the white dwarf to approach a mass of 1.4 times that of the Sun (a mass called the Chandrasekhar limit after th ...
Chapter 1: Introduction to Wide
... The word photography means “writing with light.” When we photograph something, we use various physical properties of optics, electronics, and chemical reactions to capture the object’s image and record it on a medium, whether that medium is a transparent plastic carrier (the negative), paper (a prin ...
... The word photography means “writing with light.” When we photograph something, we use various physical properties of optics, electronics, and chemical reactions to capture the object’s image and record it on a medium, whether that medium is a transparent plastic carrier (the negative), paper (a prin ...
Measurements of Neutron Star Masses
... Fig. 1]. The star continuously emits photons, dominantly in x-rays, with an effective temperature Teff that tracks the interior temperature but that is smaller by a factor of &100. The energy loss from photons is swamped by Fig. 2. Mass-radius diagram for neutron stars. Black (green) curves are for ...
... Fig. 1]. The star continuously emits photons, dominantly in x-rays, with an effective temperature Teff that tracks the interior temperature but that is smaller by a factor of &100. The energy loss from photons is swamped by Fig. 2. Mass-radius diagram for neutron stars. Black (green) curves are for ...
Lives of the Stars Lecture 5: Star birth
... easily destroyed. Helium-4 is the only really stable one, so lots of Helium-4 was formed in the next few seconds. But apart from tiny amounts of Lithium-7, no other element can be easily formed. So when the era of fusion ended, about 3½ minutes after the Big Bang, the universe consisted of lots of h ...
... easily destroyed. Helium-4 is the only really stable one, so lots of Helium-4 was formed in the next few seconds. But apart from tiny amounts of Lithium-7, no other element can be easily formed. So when the era of fusion ended, about 3½ minutes after the Big Bang, the universe consisted of lots of h ...
argo and other tidal structures around the milky way
... A sample of 2MASS M giants is used to search for overdensities that may be associated with substructure in the Galactic halo at low latitudes. Under the hypothesis that stellar populations in the outer Milky Way should be more or less symmetrically distributed, two methods were used to identify asym ...
... A sample of 2MASS M giants is used to search for overdensities that may be associated with substructure in the Galactic halo at low latitudes. Under the hypothesis that stellar populations in the outer Milky Way should be more or less symmetrically distributed, two methods were used to identify asym ...
The Life of a Star
... This is the second structure equation, that of hydrostatic equilibrium. Together with the mass equation, these two mechanical equations allow already some simple estimates of stellar conditions. Replace the derivatives in the hydrostatic equation by di erences between center (Pc ) and surface (P0 ...
... This is the second structure equation, that of hydrostatic equilibrium. Together with the mass equation, these two mechanical equations allow already some simple estimates of stellar conditions. Replace the derivatives in the hydrostatic equation by di erences between center (Pc ) and surface (P0 ...
here - NASA/IPAC Extragalactic Database
... the relative number of evolved massive stars of various kinds, such as the relative number of Wolf-Rayet stars to red supergiants, or the relative number of WC- and WN-type WRs. Secondly, these massive stars affect the overall evolution and properties of the galaxies themselves, through three “feedb ...
... the relative number of evolved massive stars of various kinds, such as the relative number of Wolf-Rayet stars to red supergiants, or the relative number of WC- and WN-type WRs. Secondly, these massive stars affect the overall evolution and properties of the galaxies themselves, through three “feedb ...
Star Formation in the Galaxy, An Observational Overview
... this material that stars form (Lada 1992). The overall efficiency of star formation in dense gas is around 10-20%, considerably higher than the the global star formation efficiency for GMCs as a whole. Although in an individual core this efficiency can range between 0 - 30 % (e.g., Lada & Lada 2003) ...
... this material that stars form (Lada 1992). The overall efficiency of star formation in dense gas is around 10-20%, considerably higher than the the global star formation efficiency for GMCs as a whole. Although in an individual core this efficiency can range between 0 - 30 % (e.g., Lada & Lada 2003) ...
Celestial Navigation education kit: Student activities 1-6
... Pole on Earth, the South Celestial Pole would be directly overhead and the stars overhead would seem to be rotating clockwise around this point. In Melbourne, the South Celestial Pole is at an angle of (approximately) 38 degrees above the horizon – Melbourne’s latitude. From southern Australia, star ...
... Pole on Earth, the South Celestial Pole would be directly overhead and the stars overhead would seem to be rotating clockwise around this point. In Melbourne, the South Celestial Pole is at an angle of (approximately) 38 degrees above the horizon – Melbourne’s latitude. From southern Australia, star ...
Astronomy
... The Oort Cloud The reservoir for long-period comets • Discovered in 1950 • This is much further out! – 50,000 AU distant! ...
... The Oort Cloud The reservoir for long-period comets • Discovered in 1950 • This is much further out! – 50,000 AU distant! ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.