DUSTY CIRCUMSTELLAR DISKS B. Zuckerman
... It has not been easy to find old T Tauri stars, in the 10- to 20-million-year range, because such stars are hard to identify with IR and optical techniques. Recently, surveys of X-ray emission, especially with the German ROSAT satellite, have enabled detection of many stars that appear to be old or ...
... It has not been easy to find old T Tauri stars, in the 10- to 20-million-year range, because such stars are hard to identify with IR and optical techniques. Recently, surveys of X-ray emission, especially with the German ROSAT satellite, have enabled detection of many stars that appear to be old or ...
hwd_ewd_v3 - X-ray and Observational Astronomy Group
... the surface) causes rapid downward diffusion of elements heavier than the principal H or He component. Hence, Schatzman predicted that white dwarf atmospheres should be extremely pure. Consequently, the spectra should be devoid of most elements, showing signatures of only hydrogen and, possibly, hel ...
... the surface) causes rapid downward diffusion of elements heavier than the principal H or He component. Hence, Schatzman predicted that white dwarf atmospheres should be extremely pure. Consequently, the spectra should be devoid of most elements, showing signatures of only hydrogen and, possibly, hel ...
Constraining the star formation histories of spiral bulges
... gradients are observed in line strengths, similar to those exhibited by elliptical galaxies. The bulge data are also consistent with correlations between Mg2, Mg2 gradient and central velocity dispersion observed in elliptical galaxies. In contrast to elliptical galaxies, central line strengths lie ...
... gradients are observed in line strengths, similar to those exhibited by elliptical galaxies. The bulge data are also consistent with correlations between Mg2, Mg2 gradient and central velocity dispersion observed in elliptical galaxies. In contrast to elliptical galaxies, central line strengths lie ...
View the sky`s greatest nebula
... lies roughly 10' north of M42. This section features a hot, bright star (center) that is ionizing the gas near it. This creates a sphere of glowing hydrogen, which appears pink. This image was shot through a 20-inch RC Optical Systems RitcheyChrétien telescope at f/8.4 with an SBIG ST10XME CCD camer ...
... lies roughly 10' north of M42. This section features a hot, bright star (center) that is ionizing the gas near it. This creates a sphere of glowing hydrogen, which appears pink. This image was shot through a 20-inch RC Optical Systems RitcheyChrétien telescope at f/8.4 with an SBIG ST10XME CCD camer ...
The Witness of the Stars
... Word (the thing spoken, sayings) of God," He asks, "But I say, Have they not heard? Yes, verily." And we may ask, How have they heard? The answer follows--"Their sound went into all the earth and their words (their teaching, message, instruction) unto the ends of the world." What words? What instruc ...
... Word (the thing spoken, sayings) of God," He asks, "But I say, Have they not heard? Yes, verily." And we may ask, How have they heard? The answer follows--"Their sound went into all the earth and their words (their teaching, message, instruction) unto the ends of the world." What words? What instruc ...
5 Report of the Panel on Stars and Stellar Evolution
... How Do Rotation and Magnetic Fields Affect Stars? There’s an old chestnut about a dozing theorist at the weekly colloquium who opens his eyes at the end of every talk and rouses himself to ask, to great approbation for his subliminal understanding, “Yes, all very interesting, but what about rotatio ...
... How Do Rotation and Magnetic Fields Affect Stars? There’s an old chestnut about a dozing theorist at the weekly colloquium who opens his eyes at the end of every talk and rouses himself to ask, to great approbation for his subliminal understanding, “Yes, all very interesting, but what about rotatio ...
normal and active - FirstLight Astro
... 1. Many galaxies were discovered in the 1700’s by a man whose name is still associated with many of them. Who was he? 2. Which type of galaxy can be spherical to flat? 3. Which type can be loosely wound to tightly wound? 4. Which type is filled with older stars and little gas? 5. Which type has star ...
... 1. Many galaxies were discovered in the 1700’s by a man whose name is still associated with many of them. Who was he? 2. Which type of galaxy can be spherical to flat? 3. Which type can be loosely wound to tightly wound? 4. Which type is filled with older stars and little gas? 5. Which type has star ...
Long-term monitoring of the short period SU UMa
... 4.1. superhump period change Her simply lies in the majority of SU UMa-type dwarf Historically, the superhump period had been known to novae. decrease during the course of the superoutburst before In order to examine whether V844 Her shows other the tidal instability was discovered (Haefner et al. 1 ...
... 4.1. superhump period change Her simply lies in the majority of SU UMa-type dwarf Historically, the superhump period had been known to novae. decrease during the course of the superoutburst before In order to examine whether V844 Her shows other the tidal instability was discovered (Haefner et al. 1 ...
Stars: Intro & Classification Astronomy 1 — Elementary Astronomy LA Mission College
... Visible Sun is a hot layer of gas ...
... Visible Sun is a hot layer of gas ...
Mn, Cu, and Zn abundances in barium stars and their correlations
... intermediate mass AGB stars, and the weak component of the s-process, thought to be sited at He-burning cores of M ≥ 10 M stars (see Raiteri et al. 1993; Matteucci et al. 1993; Mishenina et al. 2002, and references therein). Even though their positions in the periodic table are contiguous, their be ...
... intermediate mass AGB stars, and the weak component of the s-process, thought to be sited at He-burning cores of M ≥ 10 M stars (see Raiteri et al. 1993; Matteucci et al. 1993; Mishenina et al. 2002, and references therein). Even though their positions in the periodic table are contiguous, their be ...
Galaxies
... 71. Elliptical galaxies contain more gas, dust and young stars than do Sa galaxies. ...
... 71. Elliptical galaxies contain more gas, dust and young stars than do Sa galaxies. ...
- StealthSkater
... End of the Universe (whatever that might be). With all these facts at hand, we're now ready to tackle the first part of the detective story. Let's suppose we wanted to make out own map of a trip to the stars. We will limit ourselves to the 55 light-year radius covered by the detailed star catalogs. ...
... End of the Universe (whatever that might be). With all these facts at hand, we're now ready to tackle the first part of the detective story. Let's suppose we wanted to make out own map of a trip to the stars. We will limit ourselves to the 55 light-year radius covered by the detailed star catalogs. ...
Hot subdwarf stars-galactic orbits and distribution perpendicular to
... Hot subdwarfs are blue, horizontal-branch like stars, representing the late stages of evolution of stars having started with less than about 2.5 M⊙ on the main sequence. The hotter subdwarf B (sdB) stars form a well defined group. Their luminosity is of the order of 10 L⊙ and their surface temperatu ...
... Hot subdwarfs are blue, horizontal-branch like stars, representing the late stages of evolution of stars having started with less than about 2.5 M⊙ on the main sequence. The hotter subdwarf B (sdB) stars form a well defined group. Their luminosity is of the order of 10 L⊙ and their surface temperatu ...
Epsilon Aurigae: a rare stellar eclipse - Project VS
... from the inside. The previous eclipse took place back in 1982-1984. The recent was in 2009-2011, when a new generation of telescopes had been prepared on this stellar enigma in an effort to unlock its mystery. This was only the seventh documented eclipse in history (2010, 1983, 1956, 1930, 1902, 187 ...
... from the inside. The previous eclipse took place back in 1982-1984. The recent was in 2009-2011, when a new generation of telescopes had been prepared on this stellar enigma in an effort to unlock its mystery. This was only the seventh documented eclipse in history (2010, 1983, 1956, 1930, 1902, 187 ...
Fluorine abundances in dwarf stars of the solar neighbourhood⋆
... via H- and He-burning sequences in very massive stars (fluorine being ejected in high mass-loss rate WR winds). Finally, they found a quantitative agreement between the Galactic and Large Magellanic Cloud results with the predictions of models in which 19 F is produced from neutrino nucleosynthesis ...
... via H- and He-burning sequences in very massive stars (fluorine being ejected in high mass-loss rate WR winds). Finally, they found a quantitative agreement between the Galactic and Large Magellanic Cloud results with the predictions of models in which 19 F is produced from neutrino nucleosynthesis ...
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 ...
Cassiopeia (constellation)
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is easily recognizable due to its distinctive 'M' shape when in upper culmination but in higher northern locations when near lower culminations in spring and summer it has a 'W' shape, formed by five bright stars. It is bordered by Andromeda to the south, Perseus to the southeast, and Cepheus to the north. It is opposite the Big Dipper.In northern locations above 34ºN latitude it is visible year-round and in the (sub)tropics it can be seen at its clearest from September to early November in its characteristic 'M' shape. Even in low southern latitudes below 25ºS is can be seen low in the North.