ref H-R Spectral types
... In this Activity we have had a look at the Balmer series, and how its occurrence in the photospheres of stars will vary with temperature. The temperature, and hence the colour and spectral line strength characteristics of stars, is used to classify them into types O, B, A, F, G, K and M-type stars. ...
... In this Activity we have had a look at the Balmer series, and how its occurrence in the photospheres of stars will vary with temperature. The temperature, and hence the colour and spectral line strength characteristics of stars, is used to classify them into types O, B, A, F, G, K and M-type stars. ...
Astro 210 Lecture 4 Sept. 4, 2013 Announcements: • PS 1 available
... most of the rest: cooler but more luminous: “giants” Q: how do we know they are giant? a rare few: hot but luminous: “supergiants” not rare but dim and hard to find: very hot but very low-L objects: “white dwarfs” Q: how do we know they are teeny? ...
... most of the rest: cooler but more luminous: “giants” Q: how do we know they are giant? a rare few: hot but luminous: “supergiants” not rare but dim and hard to find: very hot but very low-L objects: “white dwarfs” Q: how do we know they are teeny? ...
Lecture 31
... light years--not a star, and L = 1040 watts--1,000 L (MW)!! .8 to 14(?) Billion years--distance range. L = 1038-1042 watts. Energy comes from a region solar system-sized. Radio Jets. A thermal (synchotron) and non-thermal (black-body) continuous spectrum & broad (gas with varying speeds) lines. Foun ...
... light years--not a star, and L = 1040 watts--1,000 L (MW)!! .8 to 14(?) Billion years--distance range. L = 1038-1042 watts. Energy comes from a region solar system-sized. Radio Jets. A thermal (synchotron) and non-thermal (black-body) continuous spectrum & broad (gas with varying speeds) lines. Foun ...
Section 1 Notes on Stars
... • As a low-mass star ages, convection occurs over a larger portion of its volume • This takes heavy elements formed in the star’s interior and ...
... • As a low-mass star ages, convection occurs over a larger portion of its volume • This takes heavy elements formed in the star’s interior and ...
Document
... • As a low-mass star ages, convection occurs over a larger portion of its volume • This takes heavy elements formed in the star’s interior and ...
... • As a low-mass star ages, convection occurs over a larger portion of its volume • This takes heavy elements formed in the star’s interior and ...
Document
... • As a low-mass star ages, convection occurs over a larger portion of its volume • This takes heavy elements formed in the star’s interior and ...
... • As a low-mass star ages, convection occurs over a larger portion of its volume • This takes heavy elements formed in the star’s interior and ...
So why are more massive stars more luminous?
... •How does the temperature of an interstellar cloud affect its ability to form stars? •A) Star formation is so complicated that it is not possible to say how one quantity, such as temperature, affects it •B) Higher temperatures inhibit star formation •C) Higher temperatures help star formation •D) St ...
... •How does the temperature of an interstellar cloud affect its ability to form stars? •A) Star formation is so complicated that it is not possible to say how one quantity, such as temperature, affects it •B) Higher temperatures inhibit star formation •C) Higher temperatures help star formation •D) St ...
Double Stars in Scorpio`s Claws
... stars that are a rewarding challenge to any astronomer. Some of these are actual double stars (pairs of stars that orbit about each other), others are ‘apparent doubles’ – stars that simply lie along the same line of sight, but are very distant from each other in space. The map below indicates the l ...
... stars that are a rewarding challenge to any astronomer. Some of these are actual double stars (pairs of stars that orbit about each other), others are ‘apparent doubles’ – stars that simply lie along the same line of sight, but are very distant from each other in space. The map below indicates the l ...
Implications of the Search and Discovery
... Where to look in galaxy? • Disk region of galaxy – Population I stars that have access to heavy elements during formation • Star like our Sun worked at least once ...
... Where to look in galaxy? • Disk region of galaxy – Population I stars that have access to heavy elements during formation • Star like our Sun worked at least once ...
PHYS 390 Lecture 3
... to 30,000 K range, with the Sun having a surface temperature of 5,800 K. The luminosity of young stars is observed to increase steadily with their temperature, so a measurement of temperature (from wavelength) provides a measure of L. Knowing T by itself doesn’t tell us L unless the radius if known. ...
... to 30,000 K range, with the Sun having a surface temperature of 5,800 K. The luminosity of young stars is observed to increase steadily with their temperature, so a measurement of temperature (from wavelength) provides a measure of L. Knowing T by itself doesn’t tell us L unless the radius if known. ...
Lecture21 - UCSB Physics
... has gone up by about 40%. These changes in the core have made the Sun’s outer layers expand in radius by 6% and increased the surface temperature from 5500 K to 5800 K. ...
... has gone up by about 40%. These changes in the core have made the Sun’s outer layers expand in radius by 6% and increased the surface temperature from 5500 K to 5800 K. ...
Implications of the Search and Discovery of Life in the Universe
... Where to look in galaxy? • Disk region of galaxy – Population I stars that have access to heavy elements during formation • Star like our Sun worked at least once ...
... Where to look in galaxy? • Disk region of galaxy – Population I stars that have access to heavy elements during formation • Star like our Sun worked at least once ...
Last time: Star Clusters (sec. 19.6)
... envelope is lost that the last bit of envelope gets ejected as a more or less spherical shell of gas called a planetary nebula. (see pretty images, pp. 526527) (Note: “planetary” has nothing to do with planets; just a historical term.) What remains, the degenerate hot core, now unveiled, is a young ...
... envelope is lost that the last bit of envelope gets ejected as a more or less spherical shell of gas called a planetary nebula. (see pretty images, pp. 526527) (Note: “planetary” has nothing to do with planets; just a historical term.) What remains, the degenerate hot core, now unveiled, is a young ...
Teacher Guide Lives of Stars
... 112.33(c)-11B: characterize star formation in stellar nurseries from giant molecular clouds, to protostars, to the development of main sequence stars. 112.33(c)-11C: evaluate the relationship between mass and fusion on the dying process and properties of stars. 112.33(c)-11D: differentiate among the ...
... 112.33(c)-11B: characterize star formation in stellar nurseries from giant molecular clouds, to protostars, to the development of main sequence stars. 112.33(c)-11C: evaluate the relationship between mass and fusion on the dying process and properties of stars. 112.33(c)-11D: differentiate among the ...
Galaxies Galaxies M81
... galaxy. Such galaxies, i.e. spirals with extremely bright nuclei, form a class of active galaxies known as Seyfert galaxies. ...
... galaxy. Such galaxies, i.e. spirals with extremely bright nuclei, form a class of active galaxies known as Seyfert galaxies. ...
The Life of a Star
... throws its outer layers into space, forming a planetary nebula – This leaves behind the hot dense core of the red giant. – The remaining core is called a white dwarf. Over time, the white dwarf cools off and becomes a black dwarf. Planetary Nebula: A collection of gas and dust that was formed during ...
... throws its outer layers into space, forming a planetary nebula – This leaves behind the hot dense core of the red giant. – The remaining core is called a white dwarf. Over time, the white dwarf cools off and becomes a black dwarf. Planetary Nebula: A collection of gas and dust that was formed during ...
Measuring Distance with Spectroscopic Parallax
... 1. Print out the HR diagram. 2. Using a pen or pencil, draw a smooth best-fit curve that runs through the middle of all of your main sequence stars. Just ignore the red giants and white dwarfs for this activity. Note that this will not be a straight line; it will curve slightly. And, it will not go ...
... 1. Print out the HR diagram. 2. Using a pen or pencil, draw a smooth best-fit curve that runs through the middle of all of your main sequence stars. Just ignore the red giants and white dwarfs for this activity. Note that this will not be a straight line; it will curve slightly. And, it will not go ...
Nebulae - Innovative Teachers BG
... different disc-like objects - one of them located near the brightest stars in the cluster, and others not associated with visible stars. In the first case the star heats the gas and we observe a disc-like object while thr remote disc-like objects do not “receive” enough radiation from the star and t ...
... different disc-like objects - one of them located near the brightest stars in the cluster, and others not associated with visible stars. In the first case the star heats the gas and we observe a disc-like object while thr remote disc-like objects do not “receive” enough radiation from the star and t ...
Ch. 15 Notes
... a neighbor to our Milky Way Galaxy (a satellite to our galaxy). It was seen by Ferdenand Magellan as he circled the world. It can only be seen from the southern hemisphere. ...
... a neighbor to our Milky Way Galaxy (a satellite to our galaxy). It was seen by Ferdenand Magellan as he circled the world. It can only be seen from the southern hemisphere. ...
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 ...
Quiz 1 Review
... 22. What are the 2 types of supernovas? Explain each. Type Ia: 2 stars in a binary system…white dwarf pulls material off of red giant until it ignites and goes supernova Type II: high mass star cant fuse iron and outer layers collide with core 23. What do stars between 5-10 solar masses become? Neu ...
... 22. What are the 2 types of supernovas? Explain each. Type Ia: 2 stars in a binary system…white dwarf pulls material off of red giant until it ignites and goes supernova Type II: high mass star cant fuse iron and outer layers collide with core 23. What do stars between 5-10 solar masses become? Neu ...
Lecture 12
... The magnitude system • Astronomers quantify the intensity of light produced by a source with the unit magnitudes • Magnitudes are a logarithmic representation of the spectral flux density of a source. – Allows for easy comparison of sources with immense ranges in ...
... The magnitude system • Astronomers quantify the intensity of light produced by a source with the unit magnitudes • Magnitudes are a logarithmic representation of the spectral flux density of a source. – Allows for easy comparison of sources with immense ranges in ...
Distances farther out
... Eg. 39 Cancri : Class K0 III => Mv = +0.5. & V = 6.4 = m log(D) = 2.2 => 150 pc away But !! Giant stars have spread about average --- , If 39 Cnc is as bright as Uma (ie Mv = -0.3), then it would be 50 % farther away. In a cluster can use several stars or whole main sequence to increase precisio ...
... Eg. 39 Cancri : Class K0 III => Mv = +0.5. & V = 6.4 = m log(D) = 2.2 => 150 pc away But !! Giant stars have spread about average --- , If 39 Cnc is as bright as Uma (ie Mv = -0.3), then it would be 50 % farther away. In a cluster can use several stars or whole main sequence to increase precisio ...
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.