Stars I
... – something twice as far away will be four times fainter – something 10 times further away will be 100 times fainter – something 1000 times further away will be a million times fainter ...
... – something twice as far away will be four times fainter – something 10 times further away will be 100 times fainter – something 1000 times further away will be a million times fainter ...
absolute brightness: The apparent brightness a star would have if it
... wavelength to appear shorter (and hence bluer) than if there were no motion at all. blue supergiant: The very largest of the large, hot, bright, stars. Bohr model: First theory of the hydrogen atom to explain the observed spectral lines. This model rests on three ideas: that there is a state of lowe ...
... wavelength to appear shorter (and hence bluer) than if there were no motion at all. blue supergiant: The very largest of the large, hot, bright, stars. Bohr model: First theory of the hydrogen atom to explain the observed spectral lines. This model rests on three ideas: that there is a state of lowe ...
absolute brightness: The apparent brightness a star would have if it
... wavelength to appear shorter (and hence bluer) than if there were no motion at all. blue supergiant: The very largest of the large, hot, bright, stars. Bohr model: First theory of the hydrogen atom to explain the observed spectral lines. This model rests on three ideas: that there is a state of lowe ...
... wavelength to appear shorter (and hence bluer) than if there were no motion at all. blue supergiant: The very largest of the large, hot, bright, stars. Bohr model: First theory of the hydrogen atom to explain the observed spectral lines. This model rests on three ideas: that there is a state of lowe ...
Earth in Space and Time (SC.5.E.5.1)
... actually larger than the Sun. If this is true, why do these stars appear like points of light in the sky? A. These stars are hotter than the Sun. B. These stars have less mass than the Sun. C. These stars are farther away from Earth than the Sun is. D. These stars are made of different chemicals tha ...
... actually larger than the Sun. If this is true, why do these stars appear like points of light in the sky? A. These stars are hotter than the Sun. B. These stars have less mass than the Sun. C. These stars are farther away from Earth than the Sun is. D. These stars are made of different chemicals tha ...
The mass function of star clusters formed in turbulent molecular clouds
... in galactic environment ...
... in galactic environment ...
Leaving the Main Sequence
... it can not support itself under its own weight. So compressed that protons and electrons join to form neutrons. Core shrinks instantaneously. Rest of star falls in, then rebounds off of neutron star or black hole created in core collapse. Rebound is outward explosion. 6. Neutron star or black hole - ...
... it can not support itself under its own weight. So compressed that protons and electrons join to form neutrons. Core shrinks instantaneously. Rest of star falls in, then rebounds off of neutron star or black hole created in core collapse. Rebound is outward explosion. 6. Neutron star or black hole - ...
Big Bang Theory
... Introduction: Based at the Mount Wilson Observatory near Los Angeles, Edwin Hubble was the first to observe Cepheid variable stars in many “spiral nebulae.” Using the period-luminosity relationship discovered by Henrietta Swan Leavitt, Hubble estimated the distances to these “nebulae” and determined ...
... Introduction: Based at the Mount Wilson Observatory near Los Angeles, Edwin Hubble was the first to observe Cepheid variable stars in many “spiral nebulae.” Using the period-luminosity relationship discovered by Henrietta Swan Leavitt, Hubble estimated the distances to these “nebulae” and determined ...
Stars: from Adolescence to Old Age
... shell burning: hydrogen shell surrounding the core ignites star expands and becomes a subgiant, then a red giant Stage 6: Helium Fusion helium fusion begins in the core star passes through a yellow giant phase equilibrates as a red giant or supergiant Stage 7: Stellar Nucleosynthesis – fusion of hea ...
... shell burning: hydrogen shell surrounding the core ignites star expands and becomes a subgiant, then a red giant Stage 6: Helium Fusion helium fusion begins in the core star passes through a yellow giant phase equilibrates as a red giant or supergiant Stage 7: Stellar Nucleosynthesis – fusion of hea ...
S T A R S
... It was involved in numerous Roman, Greek , Persian and Eastern stories. Arcturus in the book of Job is thought to be Aldebaran. It is about 40 times our sun’s diameter and is about 68 light years away. Aldebaran is one of the few first magnitude stars that may be occulted by the moon. The disappeara ...
... It was involved in numerous Roman, Greek , Persian and Eastern stories. Arcturus in the book of Job is thought to be Aldebaran. It is about 40 times our sun’s diameter and is about 68 light years away. Aldebaran is one of the few first magnitude stars that may be occulted by the moon. The disappeara ...
H-R Diagram
... properties and life cycle can be determined. A simplified H-R diagram appears in your textbook. In this laboratory, you will construct an H-R diagram using data on the 20 stars that are nearest to our sun (Figure 21.1) and the 20 stars that appear brightest in our sky (Figure 21.2). Then you will us ...
... properties and life cycle can be determined. A simplified H-R diagram appears in your textbook. In this laboratory, you will construct an H-R diagram using data on the 20 stars that are nearest to our sun (Figure 21.1) and the 20 stars that appear brightest in our sky (Figure 21.2). Then you will us ...
Student Handout - Mr. vallee`s Class Site
... Orion's _______, which is made of three bright stars in a straight line. One of Orion's legs is represented by the intensely bright star called _____________, one of the brightest stars in the night sky. His two shoulders are made of the stars ___________ and _____________. Betelgeuse is so luminant ...
... Orion's _______, which is made of three bright stars in a straight line. One of Orion's legs is represented by the intensely bright star called _____________, one of the brightest stars in the night sky. His two shoulders are made of the stars ___________ and _____________. Betelgeuse is so luminant ...
2 Galaxy morphology and classification
... The stellar halo is a di↵use, roughly spherical, system of stars and globular clusters that surrounds most large galaxies. It is comprised mostly of old, metal-poor, stars. The halo has little or no net angular momentum. It is thought to have formed, at least in part, by the accretion of small satel ...
... The stellar halo is a di↵use, roughly spherical, system of stars and globular clusters that surrounds most large galaxies. It is comprised mostly of old, metal-poor, stars. The halo has little or no net angular momentum. It is thought to have formed, at least in part, by the accretion of small satel ...
All_Stars
... When the core fuel source is exhausted in massive stars, they contract and heat up to temperatures sufficient to ignite fusion in the “ash” left over from the previous core-burning stage. The final burning stage is silicon (Si) to iron (Fe) in the core. Fusion of lighter elements occurs in shells su ...
... When the core fuel source is exhausted in massive stars, they contract and heat up to temperatures sufficient to ignite fusion in the “ash” left over from the previous core-burning stage. The final burning stage is silicon (Si) to iron (Fe) in the core. Fusion of lighter elements occurs in shells su ...
Goal: To understand how to find the brightness of stars and what
... • So, they devised a way to give comparative estimates for how bright in the sky objects looked. • The brightest star in a constellation was defined to be first magnitude. • The next brightest was 2nd magnitude. • And so on – and we can see down to about 6 or 7th magnitude in a “dark” sky with our n ...
... • So, they devised a way to give comparative estimates for how bright in the sky objects looked. • The brightest star in a constellation was defined to be first magnitude. • The next brightest was 2nd magnitude. • And so on – and we can see down to about 6 or 7th magnitude in a “dark” sky with our n ...
Galaxies
... Galaxy mass measurements show that galaxies need between 3 and 10 times more mass than can be observed to explain their rotation curves. The discrepancy is even larger in galaxy clusters, which need 10 to 100 times more mass. The total needed is more than the sum of the dark matter associated with e ...
... Galaxy mass measurements show that galaxies need between 3 and 10 times more mass than can be observed to explain their rotation curves. The discrepancy is even larger in galaxy clusters, which need 10 to 100 times more mass. The total needed is more than the sum of the dark matter associated with e ...
IAUS 298: Setting the Scene for Gaia and LAMOST, The current and
... surveys that will bring a revival for Galactic studies of interstellar gas and star formation (ASKAP, GAMES). In particular, we’ll be able to study in much more detail the connection (gas) between the disk and the halo, l-v diagrams for Galactic structure, absorption, rotation curve Star formation a ...
... surveys that will bring a revival for Galactic studies of interstellar gas and star formation (ASKAP, GAMES). In particular, we’ll be able to study in much more detail the connection (gas) between the disk and the halo, l-v diagrams for Galactic structure, absorption, rotation curve Star formation a ...
The galactic metallicity gradient Martín Hernández, Nieves Leticia
... red portion of the visible spectrum. Thus, emission nebulae around newborn massive stars shine with a distinctive reddish color. Since these nebulae are predominantly formed by ionized hydrogen, they are called H II regions (the symbol of hydrogen is H; the hydrogen atom which has being ionized is d ...
... red portion of the visible spectrum. Thus, emission nebulae around newborn massive stars shine with a distinctive reddish color. Since these nebulae are predominantly formed by ionized hydrogen, they are called H II regions (the symbol of hydrogen is H; the hydrogen atom which has being ionized is d ...
So, what`s the problem for high
... specific star-like points on the sky that can be easily observed in isolation from nearby already formed high-mass stars. High-mass stars are rare, so high-mass protostars (HMPOs) are even less common, especially nearby. HMPOs are more deeply embedded than low-mass counterparts, so there are no cert ...
... specific star-like points on the sky that can be easily observed in isolation from nearby already formed high-mass stars. High-mass stars are rare, so high-mass protostars (HMPOs) are even less common, especially nearby. HMPOs are more deeply embedded than low-mass counterparts, so there are no cert ...
The Interstellar Medium
... oxygen emission lines. T ~ 104 K. Highly variable density from a few atoms per cc to a million. May contain many stars. ...
... oxygen emission lines. T ~ 104 K. Highly variable density from a few atoms per cc to a million. May contain many stars. ...
Document
... D • A is incorrect because star A has a negative apparent magnitude, which means it is a brighter star. • B is incorrect because even though star B has a big apparent magnitude, it does not have the biggest apparent magnitude of the stars listed. • C is incorrect because stars that have smaller appa ...
... D • A is incorrect because star A has a negative apparent magnitude, which means it is a brighter star. • B is incorrect because even though star B has a big apparent magnitude, it does not have the biggest apparent magnitude of the stars listed. • C is incorrect because stars that have smaller appa ...
MS Word
... that B0 stars are the hottest and M9 stars are the coolest. Thus the left side of an H-R diagram is for the hottest stars while the right side is for the coolest. Now look at the other axis. This is absolute magnitude (denoted by a capital M). This is the brightness a star would have if it was 10 pa ...
... that B0 stars are the hottest and M9 stars are the coolest. Thus the left side of an H-R diagram is for the hottest stars while the right side is for the coolest. Now look at the other axis. This is absolute magnitude (denoted by a capital M). This is the brightness a star would have if it was 10 pa ...
ASTR-1020: Astronomy II Course Lecture Notes - Faculty
... e) Population I star Cepheids (called Type I or classical Cepheids) have a slightly different period-luminosity relationship than the Population II star cepheids (called Type II Cepheids or W Virginis stars). 3. Lower mass versions of Cepheids exist called RR Lyrae type variables, which change in br ...
... e) Population I star Cepheids (called Type I or classical Cepheids) have a slightly different period-luminosity relationship than the Population II star cepheids (called Type II Cepheids or W Virginis stars). 3. Lower mass versions of Cepheids exist called RR Lyrae type variables, which change in br ...
13 The Family of Stars
... a pattern begins to form: These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence because this is where most stars are. The white dwarf region is also indicated; these stars are hot but not very luminous because they are qu ...
... a pattern begins to form: These are the 80 closest stars to us; note the dashed lines of constant radius. The darkened curve is called the main sequence because this is where most stars are. The white dwarf region is also indicated; these stars are hot but not very luminous because they are qu ...
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.