Prospects for asteroseismic inference on the envelope helium
... the propagation of uncertainties in mode frequencies than higher order differences. When determining the second-order differences we require the frequencies of three consecutive overtones. Higher order differences require the frequencies of an increasing number of overtones. In real data the number ...
... the propagation of uncertainties in mode frequencies than higher order differences. When determining the second-order differences we require the frequencies of three consecutive overtones. Higher order differences require the frequencies of an increasing number of overtones. In real data the number ...
Elliptical Galaxies
... found in de Zeeuw and Franx (1992). Dark haloes: mass at large radius Spiral galaxy rotation curves have been used to show that they are embedded in dark haloes that contain three to ten times as much mass as is visible in stars, gas and dust. Can dark haloes be detected in elliptical galaxies? The ...
... found in de Zeeuw and Franx (1992). Dark haloes: mass at large radius Spiral galaxy rotation curves have been used to show that they are embedded in dark haloes that contain three to ten times as much mass as is visible in stars, gas and dust. Can dark haloes be detected in elliptical galaxies? The ...
Spectroscopic Atlas for Amateur Astronomers
... Very useful is Spectroweb [59], to find on the home page of Dr. Alex Lobel, Royal Observatory of Belgium. It’s an interactive internet platform providing highly resolved and almost completely commented profiles of some bright stars, belonging to the middle and late spectral classes F, G, K, M. Due t ...
... Very useful is Spectroweb [59], to find on the home page of Dr. Alex Lobel, Royal Observatory of Belgium. It’s an interactive internet platform providing highly resolved and almost completely commented profiles of some bright stars, belonging to the middle and late spectral classes F, G, K, M. Due t ...
Communications in Asteroseismology
... When first hearing about the Vienna Workshop on the Future of Asteroseismology, many of you will have asked yourself the same questions: Why discuss the future now, when only the first results from space asteroseismology are available? Isn’t it odd to celebrate the 65th birthday of a renowned asterose ...
... When first hearing about the Vienna Workshop on the Future of Asteroseismology, many of you will have asked yourself the same questions: Why discuss the future now, when only the first results from space asteroseismology are available? Isn’t it odd to celebrate the 65th birthday of a renowned asterose ...
X-Ray Spectroscopy of Stars
... Stars are among the most prominent sources accessible to modern X-ray telescopes. In fact, stars located across almost all regions of a Hertzsprung-Russell diagram have been identified as X-ray sources, with only a few exceptions, most notably A-type stars and the coolest giants of spectral type M. ...
... Stars are among the most prominent sources accessible to modern X-ray telescopes. In fact, stars located across almost all regions of a Hertzsprung-Russell diagram have been identified as X-ray sources, with only a few exceptions, most notably A-type stars and the coolest giants of spectral type M. ...
Search For Gas Giants Around Late-m Dwarfs - STARS
... temperature, absolute radial velocities, rotational velocities and rotation periods. The identification of neutral atomic lines was carried out using the Vienna Atomic line Database. We were able to confirm these lines that were previously identified. We also found that some of the lines observed in ...
... temperature, absolute radial velocities, rotational velocities and rotation periods. The identification of neutral atomic lines was carried out using the Vienna Atomic line Database. We were able to confirm these lines that were previously identified. We also found that some of the lines observed in ...
NUMERICAL SIMULATIONS OF SOLAR AND STELLAR CONVECTION AND OSCILLATIONS By Dali Giorgobiani
... The Sun has a resonant cavity between the surface where the density decreases rapidly due to its low temperature and the interior where the sound speed increases with increasing temperature. Sound waves are trapped in this resonant cavity, and thousands of these p-mode oscillations are observed in t ...
... The Sun has a resonant cavity between the surface where the density decreases rapidly due to its low temperature and the interior where the sound speed increases with increasing temperature. Sound waves are trapped in this resonant cavity, and thousands of these p-mode oscillations are observed in t ...
Physical Properties of the Gas and Dust in the Orion B Molecular
... GMCs in the Orion complex (see Chapter of Bally & Heiles). It extends over 40 × 60 pc (6◦ × 8◦ ) northward from the Orion Nebula and contains several wellknown star-forming regions such as NGC 2071, NGC 2068, M 78 (HH 19–27), NGC 2024, and NGC 2023 (see Fig. 1). The two Orion clouds are located betw ...
... GMCs in the Orion complex (see Chapter of Bally & Heiles). It extends over 40 × 60 pc (6◦ × 8◦ ) northward from the Orion Nebula and contains several wellknown star-forming regions such as NGC 2071, NGC 2068, M 78 (HH 19–27), NGC 2024, and NGC 2023 (see Fig. 1). The two Orion clouds are located betw ...
Physics of the Interstellar Medium
... At longer wavelengths, i.e. in the near infrared (IR) and mm regime, dark clouds can become optically thin, revealing the highly reddened background stars. The exceptions are so called infrared dark clouds, the sites of massive star formation, which are optically thick even in the thermal IR regime ...
... At longer wavelengths, i.e. in the near infrared (IR) and mm regime, dark clouds can become optically thin, revealing the highly reddened background stars. The exceptions are so called infrared dark clouds, the sites of massive star formation, which are optically thick even in the thermal IR regime ...
Untitled - NMSU Astronomy
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
A Budget and Accounting of Metals at z~ 0: Results from the COS
... rates to estimate the total mass of metals produced by galaxies with present-day stellar mass of 109.3 – 1011.6 M⊙ . On the accounting side of the ledger, we show that a surprisingly constant 20–25% mass fraction of produced metals remain in galaxies’ stars, interstellar gas and interstellar dust, w ...
... rates to estimate the total mass of metals produced by galaxies with present-day stellar mass of 109.3 – 1011.6 M⊙ . On the accounting side of the ledger, we show that a surprisingly constant 20–25% mass fraction of produced metals remain in galaxies’ stars, interstellar gas and interstellar dust, w ...
Mapping of the extinction in giant molecular clouds using optical star
... masses should appear for a size scale of ∼ 0.5 pc. Obviously, our value corresponds to a limitation of the star counts method with optical data and not to a real characteristic size scale of the cloud. It is therefore natural to extrapolate, down to a minimum mass, the linear part of the relation lo ...
... masses should appear for a size scale of ∼ 0.5 pc. Obviously, our value corresponds to a limitation of the star counts method with optical data and not to a real characteristic size scale of the cloud. It is therefore natural to extrapolate, down to a minimum mass, the linear part of the relation lo ...
Differential rotation on both components of the pre-main
... As in Paper I, we use the Doppler imaging code ‘DoTS’ (Collier Cameron 1997) to map the surface brightness distribution of the surfaces of both stars using the Stokes I intensity spectra. The process is described in detail in Paper I and references therein. In Paper I, standard tests were performed ...
... As in Paper I, we use the Doppler imaging code ‘DoTS’ (Collier Cameron 1997) to map the surface brightness distribution of the surfaces of both stars using the Stokes I intensity spectra. The process is described in detail in Paper I and references therein. In Paper I, standard tests were performed ...
Gaia 1 and 2. A pair of new satellites of the Galaxy
... Gaia-detected sources is indeed very prominent (top left and top middle panels). Note a white patch corresponding to a dearth of Gaia sources near the centre of the over-density. This is the location of Sirius, where Gaia struggles to detect genuine stars3 . The area affected by Sirius is much large ...
... Gaia-detected sources is indeed very prominent (top left and top middle panels). Note a white patch corresponding to a dearth of Gaia sources near the centre of the over-density. This is the location of Sirius, where Gaia struggles to detect genuine stars3 . The area affected by Sirius is much large ...
Stellar Structure and Evolution
... the physical properties of the matter in the stars; hence by testing the computed models against observations we are effectively testing the physics that was used to compute the models, often under conditions where it is impossible to carry out tests in the laboratory. This chapter provides an intro ...
... the physical properties of the matter in the stars; hence by testing the computed models against observations we are effectively testing the physics that was used to compute the models, often under conditions where it is impossible to carry out tests in the laboratory. This chapter provides an intro ...
CPW
... • B is correct over A because like charges do in fact repel, not a^ract each other. If you did not know that like charges repel, you sAll could have go^en B over A, since if it were ...
... • B is correct over A because like charges do in fact repel, not a^ract each other. If you did not know that like charges repel, you sAll could have go^en B over A, since if it were ...
Giant star seismology
... Asteroseismology – the study of global properties of stars and their internal structure through their global intrinsic oscillations – is already more than a century old. An early remarkable result was obtained for Cepheids revealing the period-luminosity relation (Leavitt and Pickering, 1912), which ...
... Asteroseismology – the study of global properties of stars and their internal structure through their global intrinsic oscillations – is already more than a century old. An early remarkable result was obtained for Cepheids revealing the period-luminosity relation (Leavitt and Pickering, 1912), which ...
Radio pulsars
... than doubled the number of known pulsars • New population of high-B pulsars and new SNR associations • Globular clusters contain many millisecond pulsars • Precision timing of binary millisecond pulsars measures many properties of binary stars and tests general relativity. • Discovery of highly rela ...
... than doubled the number of known pulsars • New population of high-B pulsars and new SNR associations • Globular clusters contain many millisecond pulsars • Precision timing of binary millisecond pulsars measures many properties of binary stars and tests general relativity. • Discovery of highly rela ...
Type II SuperNova - University of Dayton
... supernova in the last 3 centuries, and for the first time astronomers not only observed the light show, but also detected 19 of the elusive neutrinos (the detectors observed electron anti-neutrinos, to be more precise) produced by the collapse of the star's core. The burst of neutrinos preceded the ...
... supernova in the last 3 centuries, and for the first time astronomers not only observed the light show, but also detected 19 of the elusive neutrinos (the detectors observed electron anti-neutrinos, to be more precise) produced by the collapse of the star's core. The burst of neutrinos preceded the ...
the PDF - Montana State University
... the same kind of object as our Sun, only very far away. This idea was proposed by philosophers Anaxagoras (c.a. 490 B.C.) and Aristarchus of Samos (c.a. 290 B.C.), but scientific proof and popular acceptance had to wait over two millenia. Huygens (1698) assumed that the brightest star, Sirius, had t ...
... the same kind of object as our Sun, only very far away. This idea was proposed by philosophers Anaxagoras (c.a. 490 B.C.) and Aristarchus of Samos (c.a. 290 B.C.), but scientific proof and popular acceptance had to wait over two millenia. Huygens (1698) assumed that the brightest star, Sirius, had t ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.