Origins: Where Are the Aliens?
... visible light. The two absorption lines just beyond 400 nanometers are caused by calcium in the Sun’s atmosphere.) Note to students that this graphic represents stellar absorption spectra (in which specific wavelengths of starlight have been absorbed by gases in the sun’s lower atmosphere or Earth’s ...
... visible light. The two absorption lines just beyond 400 nanometers are caused by calcium in the Sun’s atmosphere.) Note to students that this graphic represents stellar absorption spectra (in which specific wavelengths of starlight have been absorbed by gases in the sun’s lower atmosphere or Earth’s ...
IAU 29th General Assembly
... Astronomical Research Institute of Thailand, [email protected] • He worked before for a long time at the European Southern Observatory, where he still makes most of his observations • Most observations are recorded in the infrared, allowing higher S/N and even some daytime observations • Observatio ...
... Astronomical Research Institute of Thailand, [email protected] • He worked before for a long time at the European Southern Observatory, where he still makes most of his observations • Most observations are recorded in the infrared, allowing higher S/N and even some daytime observations • Observatio ...
Level 2 Meteorites, Shooting Stars, and Comets
... happens when the Earth goes through a region of space that is especially filled with dust and chunks of rock. Therefore we get many more meteors at these times. More precisely, meteor showers happen when Earth, on its way around the Sun, passes through the path of a comet. That's because as a comet ...
... happens when the Earth goes through a region of space that is especially filled with dust and chunks of rock. Therefore we get many more meteors at these times. More precisely, meteor showers happen when Earth, on its way around the Sun, passes through the path of a comet. That's because as a comet ...
X-ray Binaries in Nearby Galaxies
... Point, variable on short time scale X-ray sources Neutron Stars or Black Holes Accreting from binary companions ...
... Point, variable on short time scale X-ray sources Neutron Stars or Black Holes Accreting from binary companions ...
Astro 6590: Galaxies and the Universe Astro
... Properties of galaxies and clusters of galaxies which must be explained. 4. The luminosity function (LF) of galaxies is distinctly nonGaussian with a long tail extending to low luminosities. LF: Number density of galaxies per unit L φ(L)dL ~ Lα eL/L* dL φ(M)dM ~ 10-0.4(α+1)M exp(-100.4(M*-M)) dL Pre ...
... Properties of galaxies and clusters of galaxies which must be explained. 4. The luminosity function (LF) of galaxies is distinctly nonGaussian with a long tail extending to low luminosities. LF: Number density of galaxies per unit L φ(L)dL ~ Lα eL/L* dL φ(M)dM ~ 10-0.4(α+1)M exp(-100.4(M*-M)) dL Pre ...
Printable Version of this information
... the radiation in a narrower spot. At shallow angles, that same amount of radiation is spread further, resulting in less heating at any given spot. Although the length of the day is an important factor in explaining why summers are hot and winter cold, the angle of sunlight is probably more important ...
... the radiation in a narrower spot. At shallow angles, that same amount of radiation is spread further, resulting in less heating at any given spot. Although the length of the day is an important factor in explaining why summers are hot and winter cold, the angle of sunlight is probably more important ...
White dwarfs from GAIA: The 7th dimension
... The higher Balmer lines carry most of the information on log g Therefore, we would propose to cover a spectral range 3800-6800 Å with λ/∆λ≈5000. This will also allow the measurement of Ca H+K (seen e.g. in DAZ) ...
... The higher Balmer lines carry most of the information on log g Therefore, we would propose to cover a spectral range 3800-6800 Å with λ/∆λ≈5000. This will also allow the measurement of Ca H+K (seen e.g. in DAZ) ...
Power Point - Astronomer`s Proposal Tools Team
... indicating the object is not a star is ignored for all faint (detectorspecific cutoffs) objects. This is due to the fact that the reason most of these objects have the flag set due to the poor S/N in the PSF. While this issue is important in determining if the object can be used as a guide star, it ...
... indicating the object is not a star is ignored for all faint (detectorspecific cutoffs) objects. This is due to the fact that the reason most of these objects have the flag set due to the poor S/N in the PSF. While this issue is important in determining if the object can be used as a guide star, it ...
Facilitator`s Guide
... Introduction: People young and old have always been fascinated and awed by imagining how large and how old the Universe is and how far away the stars and the galaxies are from us. Today, many simply accept these huge numbers they hear as fact, without wondering how they are ascertained. In a typical ...
... Introduction: People young and old have always been fascinated and awed by imagining how large and how old the Universe is and how far away the stars and the galaxies are from us. Today, many simply accept these huge numbers they hear as fact, without wondering how they are ascertained. In a typical ...
instructor notes stellar evolution, star clusters
... star, its proper motion, μ (in "/yr), and angular distance from the cluster convergent point, θ, are known, its distance (in pc) can be obtained from the above equation. The dispersion in radial velocity for stars in an open cluster is typically quite small, no larger than ±1 to ±2 km/s. Therefore, ...
... star, its proper motion, μ (in "/yr), and angular distance from the cluster convergent point, θ, are known, its distance (in pc) can be obtained from the above equation. The dispersion in radial velocity for stars in an open cluster is typically quite small, no larger than ±1 to ±2 km/s. Therefore, ...
instructor notes stellar evolution, star clusters
... star, its proper motion μ (in "/yr), and angular distance from the cluster convergent point, θ, are known, its distance (in pc) can be obtained from the above equation. The dispersion in radial velocity for stars in an open cluster is typically quite small, no larger than ±1 to ±2 km/s. Therefore, f ...
... star, its proper motion μ (in "/yr), and angular distance from the cluster convergent point, θ, are known, its distance (in pc) can be obtained from the above equation. The dispersion in radial velocity for stars in an open cluster is typically quite small, no larger than ±1 to ±2 km/s. Therefore, f ...
MEASURING ANGLES
... Maybe it is not quite as accurate, but at least it provides rather good estimates. This is how you do it – stretch out your arm. Your fist will cover an angle of about 10o, your index finder 1o, and you whole ...
... Maybe it is not quite as accurate, but at least it provides rather good estimates. This is how you do it – stretch out your arm. Your fist will cover an angle of about 10o, your index finder 1o, and you whole ...
Preview Sample 3 - Test Bank, Manual Solution, Solution Manual
... being able to “see through” things that our eyes cannot see through. Building on this idea, you can also foreshadow later discussions of nonvisible light by pointing out that while no telescope can help the problem in visible light, we CAN penetrate the interstellar gas and dust in some other wavele ...
... being able to “see through” things that our eyes cannot see through. Building on this idea, you can also foreshadow later discussions of nonvisible light by pointing out that while no telescope can help the problem in visible light, we CAN penetrate the interstellar gas and dust in some other wavele ...
Proto-planetary disks
... distributed whereas proplyds closer to ionising star ONC stars 0.5-2Myr, youngest 0.5Myr <0.3pc from θ1 Ori C (Hillenbrand 1997), suggesting naked star disks smaller ...
... distributed whereas proplyds closer to ionising star ONC stars 0.5-2Myr, youngest 0.5Myr <0.3pc from θ1 Ori C (Hillenbrand 1997), suggesting naked star disks smaller ...
Blocking Starlight Much Closer to Home 2: This Year`s
... As I write, NASA's New Horizons spacecraft gets closer to Pluto after a 9 year journey. Soon it will give images BTH: Better than Hubble. Already, it is imaging all five known moons of Pluto (http://pluto.jhuapl.edu). For the last dozen years, my colleagues, students, and I from Williams College hav ...
... As I write, NASA's New Horizons spacecraft gets closer to Pluto after a 9 year journey. Soon it will give images BTH: Better than Hubble. Already, it is imaging all five known moons of Pluto (http://pluto.jhuapl.edu). For the last dozen years, my colleagues, students, and I from Williams College hav ...
- Cosmotography
... with the blue edge of the observed RGB. Presumably a 10 Gyr model with Z ∼ 0.002 would also be consistent with the data, while perhaps providing a better match to the observed CMD slope. We conclude that, if the bulk of the RGB stars are old (> 10 Gyr), the metallicity range is roughly Z = 0.001–0.0 ...
... with the blue edge of the observed RGB. Presumably a 10 Gyr model with Z ∼ 0.002 would also be consistent with the data, while perhaps providing a better match to the observed CMD slope. We conclude that, if the bulk of the RGB stars are old (> 10 Gyr), the metallicity range is roughly Z = 0.001–0.0 ...
JMAPS
... support for M2, with minimal stray light effects. There are three powered elements and six fold flats that are used to contain the 3.8 m effective focal length in a volume that is approximately 25” along the long axis. The system includes a rotating filter wheel with four positions. The first positi ...
... support for M2, with minimal stray light effects. There are three powered elements and six fold flats that are used to contain the 3.8 m effective focal length in a volume that is approximately 25” along the long axis. The system includes a rotating filter wheel with four positions. The first positi ...
Visual Measurements of the Multiple Star
... pattern of (1) calibration of the eyepiece, (2) collecting Pulkowa. The principle instrument was an equatorial separation and position angle measurements on a refractor with a 15-inch objective lens. This was the “known “ double star (a system that has been exten- largest refractor in the world at t ...
... pattern of (1) calibration of the eyepiece, (2) collecting Pulkowa. The principle instrument was an equatorial separation and position angle measurements on a refractor with a 15-inch objective lens. This was the “known “ double star (a system that has been exten- largest refractor in the world at t ...
Publications 2003 - Département d`Astrophysique, Géophysique et
... eccentric orbit (e=0.81) and similar component masses with a mass ratio M1/M2=1.02. Cen forms a challenge for current evolution scenarios in close binaries and it is also a puzzle how a massive binary with such a large eccentricity could have formed in the first place. Both the primary and the seco ...
... eccentric orbit (e=0.81) and similar component masses with a mass ratio M1/M2=1.02. Cen forms a challenge for current evolution scenarios in close binaries and it is also a puzzle how a massive binary with such a large eccentricity could have formed in the first place. Both the primary and the seco ...
ABSTRACT Exoplanet Habitability and an Analysis of Gliese 436 b
... Just what exactly are exoplanets though? Simply stated, they are planets that orbit other stars besides the sun.3 This simple definition is explained by the fact that the field of exoplanetology is quite young. Only twenty years have passed since the first journal article was written about 51 Pegasi ...
... Just what exactly are exoplanets though? Simply stated, they are planets that orbit other stars besides the sun.3 This simple definition is explained by the fact that the field of exoplanetology is quite young. Only twenty years have passed since the first journal article was written about 51 Pegasi ...
Aquarius (constellation)
Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for ""water-carrier"" or ""cup-carrier"", and its symbol is 20px (Unicode ♒), a representation of water.Aquarius is one of the oldest of the recognized constellations along the zodiac (the sun's apparent path). It was one of the 48 constellations listed by the 2nd century AD astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.