jordi_so
... Progress report on the determination of absolute magnitudes using Strömgren photometry. ...
... Progress report on the determination of absolute magnitudes using Strömgren photometry. ...
Lectures 19-20 The Milky Way Galaxy
... The Morphology of the Galaxy Structure of Thin and Thick Disks Galactic Disk has two major components, the thin disk, and the thick disk. Thin disk: composed of young stars, dust, and gas, with Hnthin = 350 pc (youngest stars found with scale height of 35-90 pc). Thick disk: older stars with a scal ...
... The Morphology of the Galaxy Structure of Thin and Thick Disks Galactic Disk has two major components, the thin disk, and the thick disk. Thin disk: composed of young stars, dust, and gas, with Hnthin = 350 pc (youngest stars found with scale height of 35-90 pc). Thick disk: older stars with a scal ...
The Origin of the Elements edited by David L. Alles Western Washington University
... result is carbon nuclei and even more heat. The "second wind" of heat release will be furious, increasing the light emitted from the future Sun's surface by a thousand fold. Meanwhile, the same heat will cause the outer layers of the present Sun to expand and form a huge "red giant". As stellar time ...
... result is carbon nuclei and even more heat. The "second wind" of heat release will be furious, increasing the light emitted from the future Sun's surface by a thousand fold. Meanwhile, the same heat will cause the outer layers of the present Sun to expand and form a huge "red giant". As stellar time ...
An additional term of the Galactic tide due to dark matter
... the Galactic-rotation curve. Because of the interstellar absorption, the whole rotation curve for our Galaxy is not as well determined observationally as the rotation curves of neighbouring spiral galaxies. Nevertheless, we can expect that the basic features of all these curves are similar and, ther ...
... the Galactic-rotation curve. Because of the interstellar absorption, the whole rotation curve for our Galaxy is not as well determined observationally as the rotation curves of neighbouring spiral galaxies. Nevertheless, we can expect that the basic features of all these curves are similar and, ther ...
Hot HB stars in globular clusters
... we therefore used the updated grid of NLTE model atmospheres calculated by S. Dreizler (see Dreizler et al. 1990). The model atmospheres include detailed H and He model atoms and the blanketing effects of their spectral lines but no metals. Using Saffer’s fitting program Teff , log g, and helium abu ...
... we therefore used the updated grid of NLTE model atmospheres calculated by S. Dreizler (see Dreizler et al. 1990). The model atmospheres include detailed H and He model atoms and the blanketing effects of their spectral lines but no metals. Using Saffer’s fitting program Teff , log g, and helium abu ...
AN ATTEMPT To prove the MOTION OF THE EARTH FROM
... observations were lyable to. As first from the shrinking and stretching of the materials wherewith their Instruments were made, I conceive a much greater angle then that of a minute may be mistaken in taking an altitude of fifty Degrees.For if the Instruments be made of Wood, 'tis manifest that moys ...
... observations were lyable to. As first from the shrinking and stretching of the materials wherewith their Instruments were made, I conceive a much greater angle then that of a minute may be mistaken in taking an altitude of fifty Degrees.For if the Instruments be made of Wood, 'tis manifest that moys ...
Lec16_2D
... The Age of the Universe If there were no mass (i.e., no gravity) in the universe, the Hubble expansion would proceed at a constant speed. The age of the universe would then just be given by 1 / H0. In a real universe with mass, gravity must have (over time) slowed the Hubble expansion. In the past, ...
... The Age of the Universe If there were no mass (i.e., no gravity) in the universe, the Hubble expansion would proceed at a constant speed. The age of the universe would then just be given by 1 / H0. In a real universe with mass, gravity must have (over time) slowed the Hubble expansion. In the past, ...
Universe, Galaxies, and Stars – The Basics
... Like I mentioned, Hydrogen and Helium are the two most common elements. They are also the two lightest elements. In fact every other element besides hydrogen and helium is considered a heavy element. Carbon, Oxygen, Calcium, Sulfur, Phosphorous, Gold, Silver – and all of the rest are called heavy el ...
... Like I mentioned, Hydrogen and Helium are the two most common elements. They are also the two lightest elements. In fact every other element besides hydrogen and helium is considered a heavy element. Carbon, Oxygen, Calcium, Sulfur, Phosphorous, Gold, Silver – and all of the rest are called heavy el ...
implication on the mass and
... The solid line evolves as (1+z)3.9 and represents the best fit of the total IR luminosity density at 0
... The solid line evolves as (1+z)3.9 and represents the best fit of the total IR luminosity density at 0
sections 7-8 instructor notes
... The primary opacity source in the atmospheres of B and A-type stars is atomic hydrogen, which makes its presence obvious in the flux distributions of such stars with discrete discontinuities in the stellar continua at λ912Å (the Lyman discontinuity), λ3647Å (the Balmer discontinuity), and λ8206Å (t ...
... The primary opacity source in the atmospheres of B and A-type stars is atomic hydrogen, which makes its presence obvious in the flux distributions of such stars with discrete discontinuities in the stellar continua at λ912Å (the Lyman discontinuity), λ3647Å (the Balmer discontinuity), and λ8206Å (t ...
Our Galaxy
... right: Synchrotron radiation or 21cm line below: Measure the Doppler shift of 21cm line to determine the structure / motion ...
... right: Synchrotron radiation or 21cm line below: Measure the Doppler shift of 21cm line to determine the structure / motion ...
masses of star clusters in the nuclei of bulgeless spiral galaxies
... In the last decade star clusters have been found in the centers of spiral galaxies across all Hubble types. We here present a spectroscopic study of the exceptionally bright (106 –108 L ) but compact (re 5 pc) nuclear star clusters in very late type spirals with the Ultraviolet and Visual Echelle ...
... In the last decade star clusters have been found in the centers of spiral galaxies across all Hubble types. We here present a spectroscopic study of the exceptionally bright (106 –108 L ) but compact (re 5 pc) nuclear star clusters in very late type spirals with the Ultraviolet and Visual Echelle ...
Galaxy / Cluster Ecosystem Ming Sun (University of Alabama in Huntsville)
... time ~ 10 Myr) embedded in the 6.7 keV ICM. A sharp edge 0.8 kpc south of the nucleus. Galaxy’svelocity vs.Perseus’s: + 2170 km/s --Mach number of ~ 3 --- a Bullet galaxy ! Soft X-ray Radio Optical Sun, Jerius & Jones 2005 ...
... time ~ 10 Myr) embedded in the 6.7 keV ICM. A sharp edge 0.8 kpc south of the nucleus. Galaxy’svelocity vs.Perseus’s: + 2170 km/s --Mach number of ~ 3 --- a Bullet galaxy ! Soft X-ray Radio Optical Sun, Jerius & Jones 2005 ...
Spectroscopy PPT
... Spectra (rainbows of diffracted light) can come from a (hot) glowing solid, a glowing liquid or a glowing gas (star). ...
... Spectra (rainbows of diffracted light) can come from a (hot) glowing solid, a glowing liquid or a glowing gas (star). ...
The Significance of Mega Stars
... fish. Here the word “conjunction” means a conjunction in longitude, both at 10½° Aquarius. Even though the Sun and Deneb were 60° apart in terms of latitude, there was still a conjunction in longitude, with the Sun crossing the Deneb meridian at the time of the miracle. Just as there are meridians— ...
... fish. Here the word “conjunction” means a conjunction in longitude, both at 10½° Aquarius. Even though the Sun and Deneb were 60° apart in terms of latitude, there was still a conjunction in longitude, with the Sun crossing the Deneb meridian at the time of the miracle. Just as there are meridians— ...
Document
... you may be able to use Doppler shifts to measure the radial velocities of both stars. This gives you the mass ratio, regardless of the viewing angle (e.g. nearly face-on, nearly edgeon, etc.). This is usually useful information. • If you can find the viewing angle, then you can compute true orbital ...
... you may be able to use Doppler shifts to measure the radial velocities of both stars. This gives you the mass ratio, regardless of the viewing angle (e.g. nearly face-on, nearly edgeon, etc.). This is usually useful information. • If you can find the viewing angle, then you can compute true orbital ...
Camelopardalis-Better-Know-A-Constellation
... • Although Camelopardalis is the 18th largest constellation, (757 sq. deg. ) it is not a particularly bright constellation, as the brightest stars are only of fourth magnitude. • β Camelopardalis is the brightest star, at apparent magnitude 4.03. This star is a double star, with components of magnit ...
... • Although Camelopardalis is the 18th largest constellation, (757 sq. deg. ) it is not a particularly bright constellation, as the brightest stars are only of fourth magnitude. • β Camelopardalis is the brightest star, at apparent magnitude 4.03. This star is a double star, with components of magnit ...
From Supernovae to Planets - Astronomical Society of the Pacific
... • The SOFIA finding demonstrates that supernovae not only produce dust, but that the dust can survive the explosion to become raw material for the formation of other stars—and planets. • This result supports the notion that most of the dust observed in distant young galaxies may have been made by su ...
... • The SOFIA finding demonstrates that supernovae not only produce dust, but that the dust can survive the explosion to become raw material for the formation of other stars—and planets. • This result supports the notion that most of the dust observed in distant young galaxies may have been made by su ...
The redshift of extragalactic nebulae
... valid in the absence of absorption and scattering of light in space. However, the finding of a uniform distribution of nebulae up to the greatest attainable distances with a method that requires the virtual absence of absorption and scattering is, in itself almost a proof of the correctness of this ...
... valid in the absence of absorption and scattering of light in space. However, the finding of a uniform distribution of nebulae up to the greatest attainable distances with a method that requires the virtual absence of absorption and scattering is, in itself almost a proof of the correctness of this ...
Article PDF - IOPscience
... components in this galaxy from the spectroscopy alone. The methodologically independent discovery of two distinct stellar components in CVn I from the LBC photometry and the much smaller extent of the young population surprisingly recalls their findings. A direct comparison of their spectroscopic sa ...
... components in this galaxy from the spectroscopy alone. The methodologically independent discovery of two distinct stellar components in CVn I from the LBC photometry and the much smaller extent of the young population surprisingly recalls their findings. A direct comparison of their spectroscopic sa ...
The Stars education kit - Student activities 11-20
... Lying between the Southern Cross and the False Cross is the most luminous and massive star in our Milky Way Galaxy – Eta Carinae. It radiates five million times more brightly than the Sun and is about 120 times more massive. It sheds about two Earth masses each day in its stellar wind. If the Sun ga ...
... Lying between the Southern Cross and the False Cross is the most luminous and massive star in our Milky Way Galaxy – Eta Carinae. It radiates five million times more brightly than the Sun and is about 120 times more massive. It sheds about two Earth masses each day in its stellar wind. If the Sun ga ...
Probing DM Halo Shapes Using Satellite Galaxy Kinematics
... Holmberg Effect: Satellites tend to lie along the poles of parent galaxies (Holmberg 1969; Zaritsky et al. 1997; Sales & Lambas 2004 (2dFGRS)) ...
... Holmberg Effect: Satellites tend to lie along the poles of parent galaxies (Holmberg 1969; Zaritsky et al. 1997; Sales & Lambas 2004 (2dFGRS)) ...
The Earth and Man In the Universe
... reached. Down to the ninth magnitude the number of stars is about three times greater than that of the next higher magnitude. But after this the rate of increase diminishes largely. Moreover, if the number of stars was infinite the heavens would be full of them, and we should receive quite as much l ...
... reached. Down to the ninth magnitude the number of stars is about three times greater than that of the next higher magnitude. But after this the rate of increase diminishes largely. Moreover, if the number of stars was infinite the heavens would be full of them, and we should receive quite as much l ...
Astro Physics Notes and Study Guide 2015-17
... energy required to bump its electrons into higher orbitals because it has none. Cold hydrogen can absorb energy. Therefore, even if the emission spectrum has a dark line at hydrogen it could mean that there is hydrogen; it was just to “hot” to absorb energy. In this way, a VERY carful analysis of th ...
... energy required to bump its electrons into higher orbitals because it has none. Cold hydrogen can absorb energy. Therefore, even if the emission spectrum has a dark line at hydrogen it could mean that there is hydrogen; it was just to “hot” to absorb energy. In this way, a VERY carful analysis of th ...
Death - Wayne State University Physics and Astronomy
... • They are now known to be caused by old, dead stars • The spectra of a nova shows blue-shifted absorption lines showing that a hot dense gas is expanding towards us at a few thousands of kilometers per second • The continuum is from the hot dense gas and the absorption lines are from the lowerdensi ...
... • They are now known to be caused by old, dead stars • The spectra of a nova shows blue-shifted absorption lines showing that a hot dense gas is expanding towards us at a few thousands of kilometers per second • The continuum is from the hot dense gas and the absorption lines are from the lowerdensi ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.