Exercise 6
... Determining distances using a different standard candle – the Cepheid variable star Henrietta Leavitt at Harvard University, in the early part of the 20th century, studied a class of variable stars called the Cepheids. These stars vary in brightness in a cyclical pattern, and are bright enough to b ...
... Determining distances using a different standard candle – the Cepheid variable star Henrietta Leavitt at Harvard University, in the early part of the 20th century, studied a class of variable stars called the Cepheids. These stars vary in brightness in a cyclical pattern, and are bright enough to b ...
in the milky way - Chandra X
... Galaxy is a teeming and tumultuous place. There are supernova remnants: SNR 0.9-0.1, Sagittarius A East, and probably the X-ray Thread. There are many bright X-ray sources, which astronomers believe are binary systems—or pairs of orbiting objects—that contain a black hole or a neutron star (the 1E s ...
... Galaxy is a teeming and tumultuous place. There are supernova remnants: SNR 0.9-0.1, Sagittarius A East, and probably the X-ray Thread. There are many bright X-ray sources, which astronomers believe are binary systems—or pairs of orbiting objects—that contain a black hole or a neutron star (the 1E s ...
The Milky Way
... B) Spiral arms are spun off the core of the galaxy C) Spiral arms contain a very high density of less than one solar mass stars D) Stars preferentially form in spiral arms ...
... B) Spiral arms are spun off the core of the galaxy C) Spiral arms contain a very high density of less than one solar mass stars D) Stars preferentially form in spiral arms ...
Coronal Mass Ejections and Angular Momentum Loss in Young Stars
... evident. Fortunately for Earth, our nearest stellar neighbor is relatively quiet, exhibiting activity levels several orders of magnitude lower than young, solar-type stars. In protoplanetary systems, stellar magnetic phenomena observed are analogous to the solar case, but dramatically enhanced on al ...
... evident. Fortunately for Earth, our nearest stellar neighbor is relatively quiet, exhibiting activity levels several orders of magnitude lower than young, solar-type stars. In protoplanetary systems, stellar magnetic phenomena observed are analogous to the solar case, but dramatically enhanced on al ...
Astronomy Astrophysics Massive open star clusters using the VVV survey &
... described by Borissova et al. (2011), using the algorithm of Bonatto & Bica (2010). The algorithm divides the KS , (H − KS ) and (J−KS ) ranges into a grid of cells with sizes ΔKS = 1.0 mag, and Δ(J − KS ) = Δ(H − KS ) = 0.2 mag. In each cell, it estimates the expected number density of cluster star ...
... described by Borissova et al. (2011), using the algorithm of Bonatto & Bica (2010). The algorithm divides the KS , (H − KS ) and (J−KS ) ranges into a grid of cells with sizes ΔKS = 1.0 mag, and Δ(J − KS ) = Δ(H − KS ) = 0.2 mag. In each cell, it estimates the expected number density of cluster star ...
The correct answers are written in bold, italic and underlined. The
... • In a binary star system, a giant star filling its Roche lobe dumps gas onto a white dwarf, bringing the white dwarf up to the Chandrasekhar mass limit. • The core of a massive star is gradually transformed into iron by thermonuclear fusion reactions until it collapses, causing the outer layers to ...
... • In a binary star system, a giant star filling its Roche lobe dumps gas onto a white dwarf, bringing the white dwarf up to the Chandrasekhar mass limit. • The core of a massive star is gradually transformed into iron by thermonuclear fusion reactions until it collapses, causing the outer layers to ...
Search for spectroscopical signatures of transiting HD 209458b`s
... Marcy & Butler 1996; Hatzes et al. 1996) in the past 5 years. Almost 50 such systems have been discovered to date (September 2000), all with the radial-velocity technique. Most of these new systems are giant planets (Jupiter-like) with extremely short periods, i.e., the ones which show the largest o ...
... Marcy & Butler 1996; Hatzes et al. 1996) in the past 5 years. Almost 50 such systems have been discovered to date (September 2000), all with the radial-velocity technique. Most of these new systems are giant planets (Jupiter-like) with extremely short periods, i.e., the ones which show the largest o ...
LSS-GAC – A LAMOST Spectroscopic Survey of the
... simulations, the scenario involves many currently poorly understood and often highly non-linear baryonic physics (e.g. star formation and feedback) that it is compulsory to find out empirically the assemblage history of galaxies via detailed study of large samples of member stars of nearby, well-reso ...
... simulations, the scenario involves many currently poorly understood and often highly non-linear baryonic physics (e.g. star formation and feedback) that it is compulsory to find out empirically the assemblage history of galaxies via detailed study of large samples of member stars of nearby, well-reso ...
Vibrational instability of Population III very massive mainsequence
... abruptly increases just before the ZAMS stage, the growth rate does as well and becomes positive. Fig. 2 shows the work integral for the fundamental mode and the nuclear energy generation rate for 500 M . Before the abrupt increase in the nuclear energy generation rate, the ε-mechanism does not wor ...
... abruptly increases just before the ZAMS stage, the growth rate does as well and becomes positive. Fig. 2 shows the work integral for the fundamental mode and the nuclear energy generation rate for 500 M . Before the abrupt increase in the nuclear energy generation rate, the ε-mechanism does not wor ...
The Genesis of Planets - Department of Earth and Planetary Sciences
... years. Out at 5 AU, they reach four Earth masses over a few million years. Embryos can grow even bigger near the snow line or on the edges ...
... years. Out at 5 AU, they reach four Earth masses over a few million years. Embryos can grow even bigger near the snow line or on the edges ...
Protecting planets from their stars
... solar system planets, the wind-dissipated energy follows linearly the planetary radio emission, it is expected that the planet t Boo b should have high radio emission, provided that the planet is magnetized and the proper viewing conditions are achieved. Combined with the close proximity of the syst ...
... solar system planets, the wind-dissipated energy follows linearly the planetary radio emission, it is expected that the planet t Boo b should have high radio emission, provided that the planet is magnetized and the proper viewing conditions are achieved. Combined with the close proximity of the syst ...
hydrogen deficient stars and related objects
... represent two totally distinct groups with respect to age, mass and evolution. The extreme helium stars appear to be old, evolved stars with masses of the order of unity, while the intermediate helium stars in most cases appear to belong to rather young or intermediate populations, with masses of th ...
... represent two totally distinct groups with respect to age, mass and evolution. The extreme helium stars appear to be old, evolved stars with masses of the order of unity, while the intermediate helium stars in most cases appear to belong to rather young or intermediate populations, with masses of th ...
The Direct Approach to Finding Earth-Like Planets
... Probably the #1 physical property that will be needed is the global average temperature of a planet. The UV-optical spectrum, which is basically the reflected light of the star, cannot be used to measure the temperature of a planet. If the spectrum does not show absorption lines of water vapor, it c ...
... Probably the #1 physical property that will be needed is the global average temperature of a planet. The UV-optical spectrum, which is basically the reflected light of the star, cannot be used to measure the temperature of a planet. If the spectrum does not show absorption lines of water vapor, it c ...
The Direct Approach to Finding Earth-Like Planets
... Probably the #1 physical property that will be needed is the global average temperature of a planet. The UV-optical spectrum, which is basically the reflected light of the star, cannot be used to measure the temperature of a planet. If the spectrum does not show absorption lines of water vapor, it c ...
... Probably the #1 physical property that will be needed is the global average temperature of a planet. The UV-optical spectrum, which is basically the reflected light of the star, cannot be used to measure the temperature of a planet. If the spectrum does not show absorption lines of water vapor, it c ...
Deep fields around bright stars (“Galaxies around Stars”)
... PUEO/CFHT deep field observations NACO/VLT Science Verification phase: the Casertano Deep field ...
... PUEO/CFHT deep field observations NACO/VLT Science Verification phase: the Casertano Deep field ...
Long viewed as a stately procession to a foregone
... years. Out at 5 AU, they reach four Earth masses over a few million years. Embryos can grow even bigger near the snow line or on the edges ...
... years. Out at 5 AU, they reach four Earth masses over a few million years. Embryos can grow even bigger near the snow line or on the edges ...
Massive star evolution: luminous blue variables as unexpected
... So far, stellar evolution models have been able to selfconsistently predict the stellar parameters such as temperature (T ) and luminosity (L ) only up to the stellar hydrostatic ...
... So far, stellar evolution models have been able to selfconsistently predict the stellar parameters such as temperature (T ) and luminosity (L ) only up to the stellar hydrostatic ...
Remote Observatory Atacama Desert
... in the constellation Lyra. RR Lyr stars are pulsating horizontal branch stars with a mass of about one-half of our Sun’s. Their period is short, typically less than one day. My interest in observing RR Lyr stars is, on the one hand, due to the short period of those stars—within one night you can ...
... in the constellation Lyra. RR Lyr stars are pulsating horizontal branch stars with a mass of about one-half of our Sun’s. Their period is short, typically less than one day. My interest in observing RR Lyr stars is, on the one hand, due to the short period of those stars—within one night you can ...
Scientific Background Paper: Iron`s Place and Role
... producing an outward force to overcome the inward pull of gravity. The lifecycle of stars begins with the in-fall of a ball of gas and dust and their death is ultimately the failure to find a mechanism to arrest this in-fall. The details of the mechanisms used and the various stages of the evolution ...
... producing an outward force to overcome the inward pull of gravity. The lifecycle of stars begins with the in-fall of a ball of gas and dust and their death is ultimately the failure to find a mechanism to arrest this in-fall. The details of the mechanisms used and the various stages of the evolution ...
LSS-GAC – A LAMOST Spectroscopic Survey of the Galactic Anti
... spectral classification, radial velocity (Vr ) and stellar parameters (effective temperature (Te ff ), surface gravity (log g) and metallicity [Fe/H]) for millions of Galactic stars. Together with Gaia which will provide accurate distances and tangential velocities for a billion stars, the LSS-GAC w ...
... spectral classification, radial velocity (Vr ) and stellar parameters (effective temperature (Te ff ), surface gravity (log g) and metallicity [Fe/H]) for millions of Galactic stars. Together with Gaia which will provide accurate distances and tangential velocities for a billion stars, the LSS-GAC w ...
Does Transparent Hidden Matter Generate Optical Scintillation?
... Optical Scintillation by Extraterrestrial Refractors More info in astro-ph/0302460 ...
... Optical Scintillation by Extraterrestrial Refractors More info in astro-ph/0302460 ...
Lecture 11 - University of Washington
... It is much more likely for two galaxies to interact/collide than for two stars becomes typical distance between two galaxies (say ∼ 1 Mpc) is only about 10-100 times larger than the size of a typical galaxy. For stars, typical distance (say 1 pc) is about 108 times larger than typical stellar size! ...
... It is much more likely for two galaxies to interact/collide than for two stars becomes typical distance between two galaxies (say ∼ 1 Mpc) is only about 10-100 times larger than the size of a typical galaxy. For stars, typical distance (say 1 pc) is about 108 times larger than typical stellar size! ...
Document
... • There are several distinct phases in the life cycle of a star. The evolutionary path depends on the initial mass of the star. • Although there is a continuous range of masses, there are 4 ranges of masses that capture all of the interesting features. ...
... • There are several distinct phases in the life cycle of a star. The evolutionary path depends on the initial mass of the star. • Although there is a continuous range of masses, there are 4 ranges of masses that capture all of the interesting features. ...
Stars M. R. W. Masheder Room 4.15
... The Sun and all the stars which we can see at night are part of one huge system called the Galaxy (often referred to as the Milky Way Galaxy). The Galaxy is basically disc shaped, though with a spheroidal bulge in the centre, and contains about 1011 stars in total. It also contains gas and dust betw ...
... The Sun and all the stars which we can see at night are part of one huge system called the Galaxy (often referred to as the Milky Way Galaxy). The Galaxy is basically disc shaped, though with a spheroidal bulge in the centre, and contains about 1011 stars in total. It also contains gas and dust betw ...
Planetary nebula
A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars late in their lives. The word ""nebula"" is Latin for mist or cloud and the term ""planetary nebula"" is a misnomer that originated in the 1780s with astronomer William Herschel because when viewed through his telescope, these objects appeared to him to resemble the rounded shapes of planets. Herschel's name for these objects was popularly adopted and has not been changed. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years.A mechanism for formation of most planetary nebulae is thought to be the following: at the end of the star's life, during the red giant phase, the outer layers of the star are expelled by strong stellar winds. Eventually, after most of the red giant's atmosphere is dissipated, the exposed hot, luminous core emits ultraviolet radiation to ionize the ejected outer layers of the star. Absorbed ultraviolet light energises the shell of nebulous gas around the central star, appearing as a bright coloured planetary nebula at several discrete visible wavelengths.Planetary nebulae may play a crucial role in the chemical evolution of the Milky Way, returning material to the interstellar medium from stars where elements, the products of nucleosynthesis (such as carbon, nitrogen, oxygen and neon), have been created. Planetary nebulae are also observed in more distant galaxies, yielding useful information about their chemical abundances.In recent years, Hubble Space Telescope images have revealed many planetary nebulae to have extremely complex and varied morphologies. About one-fifth are roughly spherical, but the majority are not spherically symmetric. The mechanisms which produce such a wide variety of shapes and features are not yet well understood, but binary central stars, stellar winds and magnetic fields may play a role.