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SciPoster_Jan2009
... taking place in LDN 425 and LDN 981. The goals of this project were to further explore the known young stellar objects (YSOs) in the two clouds and to search for additional embedded YSOs. In this poster we present our observational methods and the results of our observations including SEDs, color-co ...
... taking place in LDN 425 and LDN 981. The goals of this project were to further explore the known young stellar objects (YSOs) in the two clouds and to search for additional embedded YSOs. In this poster we present our observational methods and the results of our observations including SEDs, color-co ...
Chapter 12: The Life Cycle of Stars
... Remember gravitational equilibrium: outward pressure from core energy generation balances the inward push of gravity. W/o the energy generation, the core will be compressed and will heat up. ...
... Remember gravitational equilibrium: outward pressure from core energy generation balances the inward push of gravity. W/o the energy generation, the core will be compressed and will heat up. ...
September - Rose City Astronomers
... When using charting software, be sure that all of the settings correspond to your telescope’s view. Include all stellar and nonstellar objects down to appropriate magnitude limits, and be sure that you understand that some guide-star catalog “artifacts” may in fact be stars. Turn on minor planets an ...
... When using charting software, be sure that all of the settings correspond to your telescope’s view. Include all stellar and nonstellar objects down to appropriate magnitude limits, and be sure that you understand that some guide-star catalog “artifacts” may in fact be stars. Turn on minor planets an ...
Test 3 Review Clicker Questions
... a) there are no stars there. b) stars in that direction are obscured by interstellar gas. c) stars in that direction are obscured by interstellar dust. d) numerous black holes capture all the starlight behind them. ...
... a) there are no stars there. b) stars in that direction are obscured by interstellar gas. c) stars in that direction are obscured by interstellar dust. d) numerous black holes capture all the starlight behind them. ...
Lecture Notes – Galaxies
... The visible spectrum contains broad (5 000–10 000 km/s) emission lines indicating clouds of gas moving at very high speeds in the nucleus of the galaxy. 1% of spiral galaxies are Seyfert galaxies. The light output and spectrum are highly variable on short time-scales of days to months → activity is ...
... The visible spectrum contains broad (5 000–10 000 km/s) emission lines indicating clouds of gas moving at very high speeds in the nucleus of the galaxy. 1% of spiral galaxies are Seyfert galaxies. The light output and spectrum are highly variable on short time-scales of days to months → activity is ...
Epsilon Aurigae: a rare stellar eclipse - Project VS
... perform wide range of measurements and reconstruct the system with properties explaining the behavior. It is not an single night event, where the data have to be collected within minutes/hours, getting it lost otherwise. Seeing this eclipse in detail has only now become possible. For the first time, ...
... perform wide range of measurements and reconstruct the system with properties explaining the behavior. It is not an single night event, where the data have to be collected within minutes/hours, getting it lost otherwise. Seeing this eclipse in detail has only now become possible. For the first time, ...
Chapter 17--Star Stuff
... These energy-production processes operate only temporarily, although in this case “temporarily” means millions or billions of years. In contrast, gravity acts eternally. Moreover, any time gravity succeeds in shrinking a star’s core, the strength of gravity grows. (The force of gravity inside an obj ...
... These energy-production processes operate only temporarily, although in this case “temporarily” means millions or billions of years. In contrast, gravity acts eternally. Moreover, any time gravity succeeds in shrinking a star’s core, the strength of gravity grows. (The force of gravity inside an obj ...
CORONAL EVOLUTION OF THE SUN IN TIME: HIGH
... in the 47 Cas binary system. It has not been characterized optically as it has been individually detected only by radio methods (Güdel et al. 1998b) and indirectly from Hipparcos measurements as a companion to the optically bright F0 V star 47 Cas (=HR 581 ¼ HD 12230). The radio position is clearly ...
... in the 47 Cas binary system. It has not been characterized optically as it has been individually detected only by radio methods (Güdel et al. 1998b) and indirectly from Hipparcos measurements as a companion to the optically bright F0 V star 47 Cas (=HR 581 ¼ HD 12230). The radio position is clearly ...
Classification of Variable Stars
... Nomenclature of Variable Stars The name of a variable star generally consists of one or two capital letters or a Greek letter, followed by a three letter constellation abbreviation. There are also variables with names such as V746 Oph and V1668 Cyg. These are stars in constellations for which all of ...
... Nomenclature of Variable Stars The name of a variable star generally consists of one or two capital letters or a Greek letter, followed by a three letter constellation abbreviation. There are also variables with names such as V746 Oph and V1668 Cyg. These are stars in constellations for which all of ...
Astronomy Astrophysics Gaia-ESO Survey: The analysis of high-resolution The
... reduction aspects will be presented in Lewis et al. (in prep.) for the Giraffe spectra, and are described in Sacco et al. (2014) for the UVES spectra. The analysis of different types of stars is performed by different WGs. The analysis of the Giraffe spectra of FGK-type stars will be described in Recio- ...
... reduction aspects will be presented in Lewis et al. (in prep.) for the Giraffe spectra, and are described in Sacco et al. (2014) for the UVES spectra. The analysis of different types of stars is performed by different WGs. The analysis of the Giraffe spectra of FGK-type stars will be described in Recio- ...
Have You Seen Canopus Tonight?
... Sirius; only Canopus can compete with the Dog Star. Half as bright, we should all know this star. But, have you seen Canopus tonight? In ancient Egypt, 15 miles east of Alexandria, there once stood a seacoast city, site of a great temple honoring Serapis, god of the underworld and later worshiped in ...
... Sirius; only Canopus can compete with the Dog Star. Half as bright, we should all know this star. But, have you seen Canopus tonight? In ancient Egypt, 15 miles east of Alexandria, there once stood a seacoast city, site of a great temple honoring Serapis, god of the underworld and later worshiped in ...
Silicon isotopic abundance toward evolved stars and its application
... In the thermally pulsing AGB (TP-AGB) phase, thermonuclear runaways are periodically caused by He burning in a thin shell between the H-He discontinuity and the electrondegenerate C-O core. This energy goes directly into heating the local area and raises the pressure, which initiates an expansion an ...
... In the thermally pulsing AGB (TP-AGB) phase, thermonuclear runaways are periodically caused by He burning in a thin shell between the H-He discontinuity and the electrondegenerate C-O core. This energy goes directly into heating the local area and raises the pressure, which initiates an expansion an ...
Comet Observers Club Chair
... famous Bayeux Tapestry, which commemorates the Norman Conquest of England in 1066, depicts an apparition of Comet Halley. As of 1995, 878 comets have been cataloged and their orbits at least roughly calculated. Of these, 184 are periodic comets (orbital periods less than 200 years); some of the rema ...
... famous Bayeux Tapestry, which commemorates the Norman Conquest of England in 1066, depicts an apparition of Comet Halley. As of 1995, 878 comets have been cataloged and their orbits at least roughly calculated. Of these, 184 are periodic comets (orbital periods less than 200 years); some of the rema ...
The spectroscopic Hertzsprung-Russell diagram
... years (Nielsen 1964). Hertzsprung (1905) and later independently Russell (1919) realized that the knowledge of the absolute brightness of stars, or at least of the absolute brightness differences, together with their spectral type or surface temperature allowed it to distinguish fundamentally differ ...
... years (Nielsen 1964). Hertzsprung (1905) and later independently Russell (1919) realized that the knowledge of the absolute brightness of stars, or at least of the absolute brightness differences, together with their spectral type or surface temperature allowed it to distinguish fundamentally differ ...
The ages of pre-main-sequence stars
... Accepted 1999 July 2. Received 1999 June 18; in original form 1998 November 19 ...
... Accepted 1999 July 2. Received 1999 June 18; in original form 1998 November 19 ...
east and west encounter at sea
... The third one corresponds to the situation when the sun is between the observer and the equator, being either to the south or to the north of it. Fig 5, position 1, shows the situation when the sun and observer are north of the equator, being the shade of the sun north, or of the same name as the l ...
... The third one corresponds to the situation when the sun is between the observer and the equator, being either to the south or to the north of it. Fig 5, position 1, shows the situation when the sun and observer are north of the equator, being the shade of the sun north, or of the same name as the l ...
Stars & Galaxies - newmanlib.ibri.org
... Lifespan of a G Star • When it uses up the H in its core, it expands to form a red giant, burning H in an outer shell & He in the core. • When the He is gone, the star collapses to form a white dwarf. • The dwarf gradually cools till it ceases to shine, becoming a ...
... Lifespan of a G Star • When it uses up the H in its core, it expands to form a red giant, burning H in an outer shell & He in the core. • When the He is gone, the star collapses to form a white dwarf. • The dwarf gradually cools till it ceases to shine, becoming a ...
MESSIER - EarthLink
... endeavored to find others, so that astronomers would no more confuse these same nebulae with comets just beginning to appear. I observed further with suitable refractors for the discovery of comets, and this is the purpose I had in mind in compiling the catalog. ...
... endeavored to find others, so that astronomers would no more confuse these same nebulae with comets just beginning to appear. I observed further with suitable refractors for the discovery of comets, and this is the purpose I had in mind in compiling the catalog. ...
celt mthr spectrometer
... spectral line-slope information and hence Doppler velocity information. Atomic line density falls off rapidly into the IR. Molecular bands may be usable to some advantage, yet Charbonneau’s recent attempts to use radial velocities from near-IR molecular bands with Keck’s NIRSPEC falls a factor of 10 ...
... spectral line-slope information and hence Doppler velocity information. Atomic line density falls off rapidly into the IR. Molecular bands may be usable to some advantage, yet Charbonneau’s recent attempts to use radial velocities from near-IR molecular bands with Keck’s NIRSPEC falls a factor of 10 ...
P7 Further Physics
... The moon takes a _____ to orbit the Earth. However, solar eclipses do not occur every month because the moon’s orbit is inclined at 5O to that of the ______. Eclipses only occur when the moon passes through the _____ – the apparent path the ____ traces out across the _____. Words – sky, sun, month, ...
... The moon takes a _____ to orbit the Earth. However, solar eclipses do not occur every month because the moon’s orbit is inclined at 5O to that of the ______. Eclipses only occur when the moon passes through the _____ – the apparent path the ____ traces out across the _____. Words – sky, sun, month, ...
Hipparcos
![](https://commons.wikimedia.org/wiki/Special:FilePath/Hipparcos-testing-estec.jpg?width=300)
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.