The Classification of Stellar Spectra
... colours, but rather had a series of dark lines superimposed on it. Wollaston attributed the lines to natural boundaries between colours. Joseph Fraunhofer made a more careful set of observations of the solar spectrum in 1814 and found some 600 dark lines, and he specifically measured the wavelength ...
... colours, but rather had a series of dark lines superimposed on it. Wollaston attributed the lines to natural boundaries between colours. Joseph Fraunhofer made a more careful set of observations of the solar spectrum in 1814 and found some 600 dark lines, and he specifically measured the wavelength ...
Analysis of Two Pulsating X-ray Sources
... The acceleration due to gravity (g) on the surface of a star (according to Newton’s Universal Law of Gravitation) is given by g = (GM)/R2 where G = 6.67 X 10-11 Nm2/kg2, M=star’s mass and R = star’s radius Centripetal acceleration (ac) of an object on the surface of a star at its equator is given by ...
... The acceleration due to gravity (g) on the surface of a star (according to Newton’s Universal Law of Gravitation) is given by g = (GM)/R2 where G = 6.67 X 10-11 Nm2/kg2, M=star’s mass and R = star’s radius Centripetal acceleration (ac) of an object on the surface of a star at its equator is given by ...
Define the following terms in the space provided
... Describe or define the following key terms in the space provided. (1 points each for a total of 7 points) 1) Astronomical Unit (AU) The AU is the mean distance from the Earth to the Sun, about 150 million kilometers. 2) Right Ascension (RA) RA is the longitude-like coordinate on the celestial sphere ...
... Describe or define the following key terms in the space provided. (1 points each for a total of 7 points) 1) Astronomical Unit (AU) The AU is the mean distance from the Earth to the Sun, about 150 million kilometers. 2) Right Ascension (RA) RA is the longitude-like coordinate on the celestial sphere ...
charts_set_7
... These bands are formed at the telescope by using colored filters that pass only light of certain wavelengths. Mgnitudes in B and V are used to form a star’s color index, a rough estimate of its temperature (blueness). ...
... These bands are formed at the telescope by using colored filters that pass only light of certain wavelengths. Mgnitudes in B and V are used to form a star’s color index, a rough estimate of its temperature (blueness). ...
Table of Contents - Shawnee State University
... researched, organized, and laid out so that the educator need not spend hours coming up with lesson plans or labs. This has already been accomplished by certified educators. The guide is written to alleviate the fear of space and the night sky (that many elementary and middle school teachers have) w ...
... researched, organized, and laid out so that the educator need not spend hours coming up with lesson plans or labs. This has already been accomplished by certified educators. The guide is written to alleviate the fear of space and the night sky (that many elementary and middle school teachers have) w ...
Stars - Academic Computer Center
... • Binary stars provide a means of determining the masses of stars. • Other properties can also sometimes be determined from binary stars. ...
... • Binary stars provide a means of determining the masses of stars. • Other properties can also sometimes be determined from binary stars. ...
Stellar Characteristics and Evolution
... When the core temperature becomes high enough through the He-burning, the core expands and cools and becomes non-degenerate again. The star then settles down on a “Horizontal Branch” (or “Helium Burning Main Sequence”) and contracts and dims, burning Helium in its core and Hydrogen in shell around c ...
... When the core temperature becomes high enough through the He-burning, the core expands and cools and becomes non-degenerate again. The star then settles down on a “Horizontal Branch” (or “Helium Burning Main Sequence”) and contracts and dims, burning Helium in its core and Hydrogen in shell around c ...
Magnitude. . . ?
... rules of human perception. Nowadays photometry is seldom based on human vision. Therefore many similar quantities have been used, each applying to some filter used for observation of visible and unvisible radiation from the universe. Transmissivity curve of one of them (of the V filter) is similar t ...
... rules of human perception. Nowadays photometry is seldom based on human vision. Therefore many similar quantities have been used, each applying to some filter used for observation of visible and unvisible radiation from the universe. Transmissivity curve of one of them (of the V filter) is similar t ...
Spectra of Star Clusters
... • How do we measure the distance to nearby stars? • The distance to nearby stars can be measured by parallax, the shift in the apparent position of a star with respect to more distant stars as the Earth moves around the Sun. ...
... • How do we measure the distance to nearby stars? • The distance to nearby stars can be measured by parallax, the shift in the apparent position of a star with respect to more distant stars as the Earth moves around the Sun. ...
Lecture
... The brightest stars are either blue (=> unusually hot) or red (=> unusually cold). (Is this a contradiction?) ...
... The brightest stars are either blue (=> unusually hot) or red (=> unusually cold). (Is this a contradiction?) ...
Stellar Evolution Chapter 12
... The variability period of a Cepheid variable is correlated with its luminosity. The more luminous it is, the more slowly it pulsates. => Measuring a Cepheid’s period, we can determine its absolute magnitude! ...
... The variability period of a Cepheid variable is correlated with its luminosity. The more luminous it is, the more slowly it pulsates. => Measuring a Cepheid’s period, we can determine its absolute magnitude! ...
Star Stuff
... - divides the light up into its colors (wavelengths) - use a smaller range of wavelengths than entire EM spectrum because instrumentation is different ...
... - divides the light up into its colors (wavelengths) - use a smaller range of wavelengths than entire EM spectrum because instrumentation is different ...
Scorpius: The Scorpion Σκορπιος Amber Perrine Physics 1040 MWF
... hundred stars that form a shape similar to a butterfly with open wings that is visible to the naked eye. The cluster is between the bow of Sagittarius and the tail of Scorpius. It has an apparent visual magnitude of 4.2 and its angular diameter is 25 arc-minutes. Messier 6 lies approximately 1,600 l ...
... hundred stars that form a shape similar to a butterfly with open wings that is visible to the naked eye. The cluster is between the bow of Sagittarius and the tail of Scorpius. It has an apparent visual magnitude of 4.2 and its angular diameter is 25 arc-minutes. Messier 6 lies approximately 1,600 l ...
OBAFGKM(LT) extra credit due today. Mid
... Last Time: Stars “Luminosity class” is added to the spectral type, telling you if it’s main-sequence (a “dwarf”, V), giant (III), or super-giant star (I). The sun is a G2 V. Stars occur in smaller “open” and giant “globular” clusters, with hundreds to millions of stars. Stars in clusters born at th ...
... Last Time: Stars “Luminosity class” is added to the spectral type, telling you if it’s main-sequence (a “dwarf”, V), giant (III), or super-giant star (I). The sun is a G2 V. Stars occur in smaller “open” and giant “globular” clusters, with hundreds to millions of stars. Stars in clusters born at th ...
Chapter 24
... • Apparent shift in a star's position due to the orbital motion of Earth • Measured as an angle • Near stars have the largest parallax • Largest parallax is less than one second of arc ...
... • Apparent shift in a star's position due to the orbital motion of Earth • Measured as an angle • Near stars have the largest parallax • Largest parallax is less than one second of arc ...
1 Introduction - High Point University
... they reach their peak brightness and begin to fade. They are only useful as distance indicators if it is possible to calibrate them—to relate their observed brightness profile to absolute magnitudes. Type I supernovae are very uniform—the light curves and spectra for Type I supernovae are all fairly ...
... they reach their peak brightness and begin to fade. They are only useful as distance indicators if it is possible to calibrate them—to relate their observed brightness profile to absolute magnitudes. Type I supernovae are very uniform—the light curves and spectra for Type I supernovae are all fairly ...
Volcanoes and Igneous Activity Earth - Chapter 4
... Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students except by instructors using the accompanying text in their classes. All recipients o ...
... Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students except by instructors using the accompanying text in their classes. All recipients o ...
March 2016 BRAS Addendum Newsletter
... star that is a spectroscopic binary. There is a 5 th component, a mag. 10.0 star at a separation of 13,000 AU (0.21 light year). Tau CMa is the brightest star of the open cluster NGC 2362 (Caldwell 64), which is why the cluster is sometimes called the Tau Canis Major Cluster. HD B47536, mag. 5.25, 0 ...
... star that is a spectroscopic binary. There is a 5 th component, a mag. 10.0 star at a separation of 13,000 AU (0.21 light year). Tau CMa is the brightest star of the open cluster NGC 2362 (Caldwell 64), which is why the cluster is sometimes called the Tau Canis Major Cluster. HD B47536, mag. 5.25, 0 ...
File
... • Why a star’s color indicates temperature & how to use Wien’s law to determine temperature • The difference between luminosity and brightness • How we can measure radius using temperature • The magnitude system of star brightness • Stellar spectra and how it indicates surface temperature • Luminosi ...
... • Why a star’s color indicates temperature & how to use Wien’s law to determine temperature • The difference between luminosity and brightness • How we can measure radius using temperature • The magnitude system of star brightness • Stellar spectra and how it indicates surface temperature • Luminosi ...
Review of the Principles of Stellar Parallax and Practice Problems
... Practice Problem 3: Star 1 has an absolute magnitude of 0. How many times more luminous is star 1 compared to the Sun? Note: the absolute magnitude of the Sun is +4.8. ...
... Practice Problem 3: Star 1 has an absolute magnitude of 0. How many times more luminous is star 1 compared to the Sun? Note: the absolute magnitude of the Sun is +4.8. ...
Synthetic color-magnitude diagrams: the ingredients
... Binaries that are able to survive in the dense environment of star cluster (in particular GCs) are so close that even the HST is not able to resolve the single components… So, light coming from each star will combine, and the binary system will appear as a single point-like source… when indicating w ...
... Binaries that are able to survive in the dense environment of star cluster (in particular GCs) are so close that even the HST is not able to resolve the single components… So, light coming from each star will combine, and the binary system will appear as a single point-like source… when indicating w ...
December 15th 2016 - Newcastle Astronomical Society
... January 04-05, 2017, overnight • The Quadrantids is usually active between the end of December and the second week of January, and peaks around January 3rd to January 5th. Unlike other meteor showers that tend to stay at their peak for about two days, the peak period of the Quadrantids is only for a ...
... January 04-05, 2017, overnight • The Quadrantids is usually active between the end of December and the second week of January, and peaks around January 3rd to January 5th. Unlike other meteor showers that tend to stay at their peak for about two days, the peak period of the Quadrantids is only for a ...
Stars, Galaxies & Universe
... HR diagram shows temperature, brightness, color of stars and where the star is in its life cycle. Used to graph the surface temperature (x-axis) vs. brightness (yaxis) Hotter stars are on left side of graph; cooler stars on the right side of the graph Brighter stars on top of graph; dimmer stars on ...
... HR diagram shows temperature, brightness, color of stars and where the star is in its life cycle. Used to graph the surface temperature (x-axis) vs. brightness (yaxis) Hotter stars are on left side of graph; cooler stars on the right side of the graph Brighter stars on top of graph; dimmer stars on ...
Solutions Assignment #3
... Antares is a red supergiant; its spectral type M means it is red, and its luminosity class I indicates a supergiant. i. Antares has the largest radius because it is the only supergiant on the list. j. Aldebaran, Antares, and Canopus have luminosity classes other than V, which means that they have le ...
... Antares is a red supergiant; its spectral type M means it is red, and its luminosity class I indicates a supergiant. i. Antares has the largest radius because it is the only supergiant on the list. j. Aldebaran, Antares, and Canopus have luminosity classes other than V, which means that they have le ...
star - TeacherWeb
... brightly. Our Sun is a star. Most stars have partner stars. A group of two stars are known as binaries. Ancient Greeks and Romans observed patterns of stars in the sky CONSTELLATIONS They imagined that the constellations represented mythological creatures. In reality the stars in a constellation m ...
... brightly. Our Sun is a star. Most stars have partner stars. A group of two stars are known as binaries. Ancient Greeks and Romans observed patterns of stars in the sky CONSTELLATIONS They imagined that the constellations represented mythological creatures. In reality the stars in a constellation m ...
Canis Minor
Canis Minor /ˌkeɪnɨs ˈmaɪnər/ is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is counted among the 88 modern constellations. Its name is Latin for ""lesser dog"", in contrast to Canis Major, the ""greater dog""; both figures are commonly represented as following the constellation of Orion the hunter.Canis Minor contains only two stars brighter than the fourth magnitude, Procyon (Alpha Canis Minoris), with a magnitude of 0.34, and Gomeisa (Beta Canis Minoris), with a magnitude of 2.9. The constellation's dimmer stars were noted by Johann Bayer, who named eight stars including Alpha and Beta, and John Flamsteed, who numbered fourteen. Procyon is the seventh-brightest star in the night sky, as well as one of the closest. A yellow-white main sequence star, it has a white dwarf companion. Gomeisa is a blue-white main sequence star. Luyten's Star is a ninth-magnitude red dwarf and the Solar System's next closest stellar neighbour in the constellation after Procyon. The fourth-magnitude HD 66141, which has evolved into an orange giant towards the end of its life cycle, was discovered to have a planet in 2012. There are two faint deep sky objects within the constellation's borders. The 11 Canis-Minorids are a meteor shower that can be seen in early December.