Lokal fulltext - Chalmers Publication Library
... Today we consider β Pictoris to be a young star on the main sequence (spectral class A6 V) with indications that planet formation is still ongoing (see e.g. Zuckerman et al. 2001, Wahhaj et al. 2003, and references therein). Furthermore, Lagrange et al. (2009) were able to directly image a giant pla ...
... Today we consider β Pictoris to be a young star on the main sequence (spectral class A6 V) with indications that planet formation is still ongoing (see e.g. Zuckerman et al. 2001, Wahhaj et al. 2003, and references therein). Furthermore, Lagrange et al. (2009) were able to directly image a giant pla ...
Published in Contemp. Phys. 51, 464-465 (2010).
... intra-galactic motion, and the present present understanding of stellar evolution – all in particular relation to Sirius. Although Brosch stresses in the Introduction that it “is not intended to be a popularlevel book”, most of the text will be understandable to anyone with a basic knowledge of phys ...
... intra-galactic motion, and the present present understanding of stellar evolution – all in particular relation to Sirius. Although Brosch stresses in the Introduction that it “is not intended to be a popularlevel book”, most of the text will be understandable to anyone with a basic knowledge of phys ...
Magnetic cycles of Sun-like stars with different levels of coronal and
... Hertzsprung-Russell diagram (see Baliunas et al. 1995; Radick et al. 1998; Lockwood et al. 2007). For the HK-project, stars were carefully chosen according to those physical parameters, which are most close to the Sun: cold, single stars – dwarfs, belonging to the main sequence. Close binary systems ...
... Hertzsprung-Russell diagram (see Baliunas et al. 1995; Radick et al. 1998; Lockwood et al. 2007). For the HK-project, stars were carefully chosen according to those physical parameters, which are most close to the Sun: cold, single stars – dwarfs, belonging to the main sequence. Close binary systems ...
The physics of star formation
... and star formation can occur only where the gas becomes dense enough for its selfgravity to overcome these tidal forces, for example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’, turbulence and magnetic fields may be the most important effects counteracting gra ...
... and star formation can occur only where the gas becomes dense enough for its selfgravity to overcome these tidal forces, for example in spiral arms. On the intermediate scales of star-forming ‘giant molecular clouds’, turbulence and magnetic fields may be the most important effects counteracting gra ...
... – Census of galaxies nearby: Most are dim dwarf E and dwarf Irr sparsely populated with stars – Census of distant galaxies: In clusters, 60% of members are spirals and S0, while in sparsely populated regions it is 80% – Early (very young) galaxies are much smaller than Milky Way – merging of these s ...
JRASC, June 2014 Issue (PDF, low resolution)
... adjusting its shape 1000 times per second with an accuracy better than 1 nanometre; and • The capability to directly image extra-solar planets that are 1 million to 10 million times fainter than their host stars. The first observations in November 2013 targeted previously known planetary systems—th ...
... adjusting its shape 1000 times per second with an accuracy better than 1 nanometre; and • The capability to directly image extra-solar planets that are 1 million to 10 million times fainter than their host stars. The first observations in November 2013 targeted previously known planetary systems—th ...
A Digital Spectral Classification Atlas
... Wavelength ( ) Figure 6: A temperature sequence in the early B-type stars. The definition of the break between the O-type stars and the B-type stars is the absence of lines of ionized helium (He II) in the spectra of B-type stars. The lines of He I pass through a maximum at approximately B2, and the ...
... Wavelength ( ) Figure 6: A temperature sequence in the early B-type stars. The definition of the break between the O-type stars and the B-type stars is the absence of lines of ionized helium (He II) in the spectra of B-type stars. The lines of He I pass through a maximum at approximately B2, and the ...
diy astronomy - American Museum of Natural History
... At the end of this course, students will have learned or understand that: • The human eye is an imperfect, limited, and unreliable detector of light. • Astronomers use large telescopes primarily as a means to collect more photons. Large telescopes make better pictures. • There are limitations to ...
... At the end of this course, students will have learned or understand that: • The human eye is an imperfect, limited, and unreliable detector of light. • Astronomers use large telescopes primarily as a means to collect more photons. Large telescopes make better pictures. • There are limitations to ...
ancient cultures 114 - Stellenbosch University
... mundane and inappropriate as domestic lighting when viewed from a distance). In true astronomical terms, however, a star is a giant ball of gas, constantly undergoing nuclear processes, and as such constantly emitting electromagnetic waves. The light waves produced from these reactions are particula ...
... mundane and inappropriate as domestic lighting when viewed from a distance). In true astronomical terms, however, a star is a giant ball of gas, constantly undergoing nuclear processes, and as such constantly emitting electromagnetic waves. The light waves produced from these reactions are particula ...
I. Constellations
... A. A constellation is typically thought of as a collection of ____stars____ named after ____an animal____, ____a person____ or ___ an object ____. B. In modern astronomy, a constellation is defined as a specific ____area____ of the sky as determined by the International Astronomical Union (IAU). C. ...
... A. A constellation is typically thought of as a collection of ____stars____ named after ____an animal____, ____a person____ or ___ an object ____. B. In modern astronomy, a constellation is defined as a specific ____area____ of the sky as determined by the International Astronomical Union (IAU). C. ...
Mission Possible: Voyage to the Stars
... yellowish-white area) and branch off into the giant branch of the diagram, ending up in the white dwarf region. As the star begins to die it has less luminosity and the surface temperature decreases, which means that the star is now traveling to the lower right corner of the diagram. From the Hertzs ...
... yellowish-white area) and branch off into the giant branch of the diagram, ending up in the white dwarf region. As the star begins to die it has less luminosity and the surface temperature decreases, which means that the star is now traveling to the lower right corner of the diagram. From the Hertzs ...
Chemical analysis of 24 dusty (pre-) main
... Despite the broad wavelength coverage, for several program stars only a few lines turned out to be appropriate for detailed abundance analyses. Such a circumstance is not unusual for A/B-type stars, where the condition that spectral lines with equivalent widths higher than 150 mÅ should be avoided i ...
... Despite the broad wavelength coverage, for several program stars only a few lines turned out to be appropriate for detailed abundance analyses. Such a circumstance is not unusual for A/B-type stars, where the condition that spectral lines with equivalent widths higher than 150 mÅ should be avoided i ...
GALEX and Star Formation
... now included in the GALEX imaging surveys, i.e. over 80% of the total number listed in Hyperleda database within such velocity limit and no culling criteria (Thilker, priv. comm.). 2.2 The UV-emitting young populations Why is UV data sensitive to star formation? Young massive stars, hot, luminous, a ...
... now included in the GALEX imaging surveys, i.e. over 80% of the total number listed in Hyperleda database within such velocity limit and no culling criteria (Thilker, priv. comm.). 2.2 The UV-emitting young populations Why is UV data sensitive to star formation? Young massive stars, hot, luminous, a ...
book_text4
... in an orbit roughly 600 km above the Earth’s surface. On Earth, astronomers waited impatiently for the first results. After extensive technical verification and testing, it soon became obvious that Hubble’s vision was anything but sharp. The mirror had a serious flaw. A defect in the shape of the mi ...
... in an orbit roughly 600 km above the Earth’s surface. On Earth, astronomers waited impatiently for the first results. After extensive technical verification and testing, it soon became obvious that Hubble’s vision was anything but sharp. The mirror had a serious flaw. A defect in the shape of the mi ...
3D Tour of the Universe Template
... found astronomical showpiece if the sky is dark, where suggestions of its spiral arms may be visible. As is also common with these types of galaxy interactions, the central region of M51 is home to a compact, energetic birth site of massive and luminous stars, whose genesis was triggered by interste ...
... found astronomical showpiece if the sky is dark, where suggestions of its spiral arms may be visible. As is also common with these types of galaxy interactions, the central region of M51 is home to a compact, energetic birth site of massive and luminous stars, whose genesis was triggered by interste ...
Observational studies of stellar rotation
... period Prot . This technique has the advantage over spectroscopy of yielding a measurement of the stellar rotation rate that is free of geometric effects and is straighforwardly converted to angular velocity, Ω = 2π/Prot . However, this is at the expense of requiring intense photometric monitoring o ...
... period Prot . This technique has the advantage over spectroscopy of yielding a measurement of the stellar rotation rate that is free of geometric effects and is straighforwardly converted to angular velocity, Ω = 2π/Prot . However, this is at the expense of requiring intense photometric monitoring o ...
The Age Distribution of Potential Intelligent Life in the Milky Way
... From this equation we can see that the gas mass lost as it is turned into stars (per parsec squared per year) is proportional to the total mass of gas (per parsec squared) to the power n. Observations of distant galaxies have found this relationship to hold consistently, just with varying values of ...
... From this equation we can see that the gas mass lost as it is turned into stars (per parsec squared per year) is proportional to the total mass of gas (per parsec squared) to the power n. Observations of distant galaxies have found this relationship to hold consistently, just with varying values of ...
SkyProdigy Series Manual
... For astronomical viewing, out of focus star images are very diffuse, making them difficult to see. If you turn the focus knob too quickly, you can go right through focus without seeing the image. To avoid this problem, your first astronomical target should be a bright object (like the Moon or a plan ...
... For astronomical viewing, out of focus star images are very diffuse, making them difficult to see. If you turn the focus knob too quickly, you can go right through focus without seeing the image. To avoid this problem, your first astronomical target should be a bright object (like the Moon or a plan ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.