Evolution of stars
... The free-fall contraction of a molecular cloud a. can be initiated by shock waves from supernovae. b. can be initiated by nearby spectral type G stars. c. can be initiated by the rotation of the cloud. d. causes the cloud to become transparent to ultraviolet radiation. e. causes the particles in the ...
... The free-fall contraction of a molecular cloud a. can be initiated by shock waves from supernovae. b. can be initiated by nearby spectral type G stars. c. can be initiated by the rotation of the cloud. d. causes the cloud to become transparent to ultraviolet radiation. e. causes the particles in the ...
X-Ray Properties of Young Stars and Stellar Clusters
... manifested by gyrosynchrotron radio continuum emission, blue optical/UV continuum, and, in the Sun, high γ-ray and energetic particle fluences. These particles impact the stellar surface at the magnetic footprints, immediately heating gas that flows upward to fill coronal loops with X-ray emitting p ...
... manifested by gyrosynchrotron radio continuum emission, blue optical/UV continuum, and, in the Sun, high γ-ray and energetic particle fluences. These particles impact the stellar surface at the magnetic footprints, immediately heating gas that flows upward to fill coronal loops with X-ray emitting p ...
HWWS 2010 - Monash University
... range (in those systems where measured) and small radii ~10km • Strong magnetic fields; 108–1014 Gauss • Most observed to pulse, up to 700 times per second -> very rapid spins • Possess a crust and/or internal structure (glitches, starquakes) • Can be in binary systems, where accretion and hence pro ...
... range (in those systems where measured) and small radii ~10km • Strong magnetic fields; 108–1014 Gauss • Most observed to pulse, up to 700 times per second -> very rapid spins • Possess a crust and/or internal structure (glitches, starquakes) • Can be in binary systems, where accretion and hence pro ...
WHAT MAKES A STAR SO SPECIAL Abstract
... luminosity, or 1000 red stars from class M with low luminosity. This statistics shows that the formation of stars with low masses is a very common process. If we plot the spectral classes (or the temperature, which is the same) along the x-axis and the luminosity (or stars’ absolute magnitude) along ...
... luminosity, or 1000 red stars from class M with low luminosity. This statistics shows that the formation of stars with low masses is a very common process. If we plot the spectral classes (or the temperature, which is the same) along the x-axis and the luminosity (or stars’ absolute magnitude) along ...
Super-Eddington outburst in a binary system: V4641 Sgr Mikhail Revnivtsev, Marat Gilfanov
... • When the accretion rate decreased the envelope vanished • X-ray observations support this picture: we have detected the change in the X-ray absorption column, smeared and probably delayed variability of fluorescent Fe line • Source is also interesting from the point of view of unusually high Lopt/ ...
... • When the accretion rate decreased the envelope vanished • X-ray observations support this picture: we have detected the change in the X-ray absorption column, smeared and probably delayed variability of fluorescent Fe line • Source is also interesting from the point of view of unusually high Lopt/ ...
The Stars - Springer
... (Betelgeuse) is the brightest star in the constellation Orion, b Orionios (Rigel), the second brightest, and so on and so forth. When all the letters of the Greek alphabet are used up, numbers are then given to the stars; thus: 1 Orionis, 2, Orionis and so on. The use of the Greek alphabet for refer ...
... (Betelgeuse) is the brightest star in the constellation Orion, b Orionios (Rigel), the second brightest, and so on and so forth. When all the letters of the Greek alphabet are used up, numbers are then given to the stars; thus: 1 Orionis, 2, Orionis and so on. The use of the Greek alphabet for refer ...
Detection of the Stochastic Background of nHz Gravitational Radiation from Massive Black
... Radio Astronomy Laboratory University of California, Berkeley 2003 Summer School, SLAC ...
... Radio Astronomy Laboratory University of California, Berkeley 2003 Summer School, SLAC ...
Sample pages 1 PDF
... Do you remember the first night that you stood for the very first time under a clear night sky and gazed with bewilderment at its beauty? And did you think something like this as you watched: ‘‘How many stars there are! How can anyone make any sense of this mass of stars?’’ An attentive observer wil ...
... Do you remember the first night that you stood for the very first time under a clear night sky and gazed with bewilderment at its beauty? And did you think something like this as you watched: ‘‘How many stars there are! How can anyone make any sense of this mass of stars?’’ An attentive observer wil ...
Processing of Star Catalog and Star Image
... (sub-blocks) by planes that are parallel to the equatorial plane. Each spherical zone has the same span of declination [2]. And guide stars in GSC can be directly retrieved by using a declination value. The problem with this method lies in the extremely uneven distribution of each sub-block. The num ...
... (sub-blocks) by planes that are parallel to the equatorial plane. Each spherical zone has the same span of declination [2]. And guide stars in GSC can be directly retrieved by using a declination value. The problem with this method lies in the extremely uneven distribution of each sub-block. The num ...
The science case for - Astrophysics
... dominated by poorly understood dark matter and a mysterious vacuum energy density. This progress poses new, and more fundamental, questions, the answers to some of which will perhaps unite astrophysics with elementary particle physics in a new approach to the nature of matter. Some discoveries, made ...
... dominated by poorly understood dark matter and a mysterious vacuum energy density. This progress poses new, and more fundamental, questions, the answers to some of which will perhaps unite astrophysics with elementary particle physics in a new approach to the nature of matter. Some discoveries, made ...
Astronomy Astrophysics Detailed abundances of a large sample of giant stars in... and in the Sagittarius nucleus
... While some studies of the chemical composition of red giant branch (RGB) stars in this GC exist in the literature (Brown et al. 1999, hereinafter BWG99), they are limited to just a few stars, hence useful only to provide some interesting average values. What is still lacking is an extensive survey, ...
... While some studies of the chemical composition of red giant branch (RGB) stars in this GC exist in the literature (Brown et al. 1999, hereinafter BWG99), they are limited to just a few stars, hence useful only to provide some interesting average values. What is still lacking is an extensive survey, ...
Stellar Populations of Dwarf Elliptical Galaxies: UBVRI Photometry
... little-to-no angular momentum? Were they formed through the collision of even lower mass galaxies and thus ended up with no net angular momentum? Did they transfer their angular momentum as they moved through the dense cluster? In support of the latter process, Mayer et al. (2001a,b) have shown that ...
... little-to-no angular momentum? Were they formed through the collision of even lower mass galaxies and thus ended up with no net angular momentum? Did they transfer their angular momentum as they moved through the dense cluster? In support of the latter process, Mayer et al. (2001a,b) have shown that ...
Suppose you tried to determine where we are in the galaxy by
... the edge of the Milky Way disk and therefore exterior to most of the mass of the galaxy. b) True, the Milky Way's rotation curve stops increasing well before the orbit of the Sun, indicating that the majority of the Milky Way's mass lies within the Sun's orbit. c) False, the Milky Way's rotation c ...
... the edge of the Milky Way disk and therefore exterior to most of the mass of the galaxy. b) True, the Milky Way's rotation curve stops increasing well before the orbit of the Sun, indicating that the majority of the Milky Way's mass lies within the Sun's orbit. c) False, the Milky Way's rotation c ...
CHAPTER 1 The Formation and Structure of Stars
... • The thermal energy in clouds of gas causes them to resist collapse. – Temperature is a measure of the motion of the atoms or molecules in a material—in a hot gas, the atoms move more rapidly than do those in a cool gas. – Although the interstellar clouds are very cold, even at a temperature of onl ...
... • The thermal energy in clouds of gas causes them to resist collapse. – Temperature is a measure of the motion of the atoms or molecules in a material—in a hot gas, the atoms move more rapidly than do those in a cool gas. – Although the interstellar clouds are very cold, even at a temperature of onl ...
A search for a new class of pulsating DA white dwarf stars in the DB
... down to the low temperature limit set by the age of the Galaxy, it is a remarkable and intriguing fact that few helium atmosphere white dwarfs occur in the effective temperature range between 45 000 ≥ T eff ≥ 30, 000 K. The DOs and DBs are found on either side of this temperature range, but only a v ...
... down to the low temperature limit set by the age of the Galaxy, it is a remarkable and intriguing fact that few helium atmosphere white dwarfs occur in the effective temperature range between 45 000 ≥ T eff ≥ 30, 000 K. The DOs and DBs are found on either side of this temperature range, but only a v ...
Unraveling the Helix Nebula: Its Structure and Knots
... the local ionization front. This supports a scenario in which the knots are formed in or near the ionization front and are then sculpted by the stellar radiation from the central star as the ionization front advances beyond them. ...
... the local ionization front. This supports a scenario in which the knots are formed in or near the ionization front and are then sculpted by the stellar radiation from the central star as the ionization front advances beyond them. ...
Article PDF - IOPscience
... Hubble Space Telescope (HST) imaging of three nearby CSO host galaxies (Perlman et al. 2001b) show them to be nearly normal ellipticals; however, disturbed isophotes at the outer edges suggest that a past merger has taken place in all objects (Perlman et al. 2001b). Simulations suggest that the radi ...
... Hubble Space Telescope (HST) imaging of three nearby CSO host galaxies (Perlman et al. 2001b) show them to be nearly normal ellipticals; however, disturbed isophotes at the outer edges suggest that a past merger has taken place in all objects (Perlman et al. 2001b). Simulations suggest that the radi ...
GammaRay Bursts, the Strongest Explosions in the Universe.
... GRBs could be extra galactic, making them much more powerful than if they were produced by relativity “local” Galactic objects. Note that a source at distant galaxy is million times further than a source in our own Galaxy. This would make an extragalactic bursts 1012 ...
... GRBs could be extra galactic, making them much more powerful than if they were produced by relativity “local” Galactic objects. Note that a source at distant galaxy is million times further than a source in our own Galaxy. This would make an extragalactic bursts 1012 ...
A spectroscopic investigation of the O
... Results. We confirm the binarity for four objects: HD 193443, HD 228989, HD 229234, and HD 194649. We derive for the first time the orbital solutions of three systems, and we confirm the values of the fourth, showing that these four systems all have orbital periods shorter than 10 days. Besides thes ...
... Results. We confirm the binarity for four objects: HD 193443, HD 228989, HD 229234, and HD 194649. We derive for the first time the orbital solutions of three systems, and we confirm the values of the fourth, showing that these four systems all have orbital periods shorter than 10 days. Besides thes ...
A History of Star Catalogues - The Albuquerque Astronomical Society
... contains a catalogue of 777 stars. (Watbooks-Brahe 2003) They are measured with far greater accuracy than any previous measurements. The book was printed between 1588 and 1598 by Tycho’s private press on the Island of Hven, where his observatory called Uranaborg was located. After Tycho died his ass ...
... contains a catalogue of 777 stars. (Watbooks-Brahe 2003) They are measured with far greater accuracy than any previous measurements. The book was printed between 1588 and 1598 by Tycho’s private press on the Island of Hven, where his observatory called Uranaborg was located. After Tycho died his ass ...
Measurements of Neutron Star Masses
... Arecibo observation.We calculated the bestfit DM for each of the 16 bins individually, keeping other timing parameters fixed at the best-fit values (Table 3). We then investigate the DM versus orbital phase for each epoch, as plotted in Fig. 10. Although variations at individual epochs are somewhat ...
... Arecibo observation.We calculated the bestfit DM for each of the 16 bins individually, keeping other timing parameters fixed at the best-fit values (Table 3). We then investigate the DM versus orbital phase for each epoch, as plotted in Fig. 10. Although variations at individual epochs are somewhat ...
Rest-frame Optical Spectra: A Window into Galaxy Formation at z~2
... • We typically target a small number of Xray and/or IR-selected AGNs on each mask. • Use MOSFIRE spectra to identify additional AGNs. • We will study AGN demographics, distributions of BH accretion rates, methods of AGN detection. • With early sample of AGNs (red X-ray, burgunday IR), we are sta ...
... • We typically target a small number of Xray and/or IR-selected AGNs on each mask. • Use MOSFIRE spectra to identify additional AGNs. • We will study AGN demographics, distributions of BH accretion rates, methods of AGN detection. • With early sample of AGNs (red X-ray, burgunday IR), we are sta ...
Dynamical properties of a large young disk galaxy at z=2.03⋆
... dynamically heated with respect to local galaxies (V/σz ∼ 4) and it is offset from the local stellar mass TFR at the 2σ level. But, this offset depends on the SED modeling parameters. In particular, for a 2-component star formation history (SFH), F257 is in agreement with the local stellar mass TFR. ...
... dynamically heated with respect to local galaxies (V/σz ∼ 4) and it is offset from the local stellar mass TFR at the 2σ level. But, this offset depends on the SED modeling parameters. In particular, for a 2-component star formation history (SFH), F257 is in agreement with the local stellar mass TFR. ...
Supernovae and Gamma-Ray Bursts (draft)
... Summary. Supernovae are explosions of stars which are triggered either by the implosion of the core of a star or a thermonuclear runaway, causing a bright optical display lasting for weeks to years. This chapter first explains the main explosion types, how they are classified and the principles that ...
... Summary. Supernovae are explosions of stars which are triggered either by the implosion of the core of a star or a thermonuclear runaway, causing a bright optical display lasting for weeks to years. This chapter first explains the main explosion types, how they are classified and the principles that ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.