Chemical analysis of 24 dusty (pre-) main
... Despite the broad wavelength coverage, for several program stars only a few lines turned out to be appropriate for detailed abundance analyses. Such a circumstance is not unusual for A/B-type stars, where the condition that spectral lines with equivalent widths higher than 150 mÅ should be avoided i ...
... Despite the broad wavelength coverage, for several program stars only a few lines turned out to be appropriate for detailed abundance analyses. Such a circumstance is not unusual for A/B-type stars, where the condition that spectral lines with equivalent widths higher than 150 mÅ should be avoided i ...
An Expanded View of the Universe
... Black holes: what was their role in shaping the Universe? Black holes have puzzled physicists and astronomers since they were first postulated in relativistic form a century ago by Karl Schwarzschild. Observations have demonstrated that these bizarre objects really exist. And on a grand scale, too: ...
... Black holes: what was their role in shaping the Universe? Black holes have puzzled physicists and astronomers since they were first postulated in relativistic form a century ago by Karl Schwarzschild. Observations have demonstrated that these bizarre objects really exist. And on a grand scale, too: ...
variation in the pre-transit balmer line signal around
... be selected. Since all of the absorption is measured relative to the master comparison spectrum, choosing different spectra will increase or decrease the measured absorption values. Thus the true zero-point is difficult to determine for the small window of time that a single night of observing provid ...
... be selected. Since all of the absorption is measured relative to the master comparison spectrum, choosing different spectra will increase or decrease the measured absorption values. Thus the true zero-point is difficult to determine for the small window of time that a single night of observing provid ...
Silicon isotopic abundance toward evolved stars and its application
... the local area and raises the pressure, which initiates an expansion and a series of convective and mixing events (Herwig 2005; Iben & Renzini 1983). During the so-called third dredgeup, the products of He burning and the s-process elements are brought to the surface, e.g., 12 C, which can lead to t ...
... the local area and raises the pressure, which initiates an expansion and a series of convective and mixing events (Herwig 2005; Iben & Renzini 1983). During the so-called third dredgeup, the products of He burning and the s-process elements are brought to the surface, e.g., 12 C, which can lead to t ...
ABSTRACT Exoplanet Habitability and an Analysis of Gliese 436 b
... have greater disparities between then maximum and minimum light flux on the light curve. However, advancements in light capturing cameras and the Kepler Spacecraft have made it easier to detect Earth-like planets in both composition and size.8 The transit method can also be used to determine the tim ...
... have greater disparities between then maximum and minimum light flux on the light curve. However, advancements in light capturing cameras and the Kepler Spacecraft have made it easier to detect Earth-like planets in both composition and size.8 The transit method can also be used to determine the tim ...
introduction to geodetic astronomy
... when dealing with new technologies (e.g. inertial survey systems) an understanding of the local astronomic coordinate system is ...
... when dealing with new technologies (e.g. inertial survey systems) an understanding of the local astronomic coordinate system is ...
the PDF program book
... It is our goal to provide you with a relaxed and comfortable experience. Sweden is a safe friendly place and the Cool Stars 19 organizers are committed to making this meeting productive and enjoyable for everyone, regardless of gender, sexual orientation, disability, physical appearance, body size, ...
... It is our goal to provide you with a relaxed and comfortable experience. Sweden is a safe friendly place and the Cool Stars 19 organizers are committed to making this meeting productive and enjoyable for everyone, regardless of gender, sexual orientation, disability, physical appearance, body size, ...
Present-day cosmic abundances - Dr. Karl Remeis
... reference because of the lack of another reliable standard, despite its chemical composition may not be representative for the objects of study, e.g. whenever a local and present-day reference is required. This is because the Sun can a priori not be assumed to provide a standard for the chemical com ...
... reference because of the lack of another reliable standard, despite its chemical composition may not be representative for the objects of study, e.g. whenever a local and present-day reference is required. This is because the Sun can a priori not be assumed to provide a standard for the chemical com ...
interstellar dust - Ira-Inaf
... Solid particles pervade interstellar space in the Milky Way and other galaxies It occurs in a wide variety of astrophysical enviroments, from comets to giant molecular clouds, from ...
... Solid particles pervade interstellar space in the Milky Way and other galaxies It occurs in a wide variety of astrophysical enviroments, from comets to giant molecular clouds, from ...
2 Statistical properties of a sample of periodically variable B-type supergiants
... not new. Microvariations with amplitudes between a hundredth and a tenth of a magnitude in the visual, and periods ranging from some 5 to 100 d, have been found in numerous supergiants of spectral type OBA, termed α Cyg variables (Sterken 1977, 1983; Burki et al. 1978; van Genderen et al. 1989; Lame ...
... not new. Microvariations with amplitudes between a hundredth and a tenth of a magnitude in the visual, and periods ranging from some 5 to 100 d, have been found in numerous supergiants of spectral type OBA, termed α Cyg variables (Sterken 1977, 1983; Burki et al. 1978; van Genderen et al. 1989; Lame ...
azu_etd_13224_sip1_m
... structure, and host star abundances play in the different stages of planet formation? In this thesis, beginning with a brief literature review in Chapter 2, I trace oxygen and carbon species through these stages to inform how, when, and where planets form. In Chapter 3 I describe a study of the mole ...
... structure, and host star abundances play in the different stages of planet formation? In this thesis, beginning with a brief literature review in Chapter 2, I trace oxygen and carbon species through these stages to inform how, when, and where planets form. In Chapter 3 I describe a study of the mole ...
Elements of astronomy
... on any night will represent them with equal exactness on any other night. They all seem to be at the same distance from us, and to be attached to the surface of a vast hemisphere, of which the place of the observer is the centre. But, although the stars are relatively fixed, the hemisphere, Stars ri ...
... on any night will represent them with equal exactness on any other night. They all seem to be at the same distance from us, and to be attached to the surface of a vast hemisphere, of which the place of the observer is the centre. But, although the stars are relatively fixed, the hemisphere, Stars ri ...
Star formation rates and efficiencies in the Galactic Centre
... The feedback from the recently formed high-mass stars then begins to drive turbulence and thereby increase the virial ratio of the gas, which quenches the star formation. Then as feedback from these stars’ fades, gas can again accumulate and the cycle repeats. The estimated cycle timescale for a Mil ...
... The feedback from the recently formed high-mass stars then begins to drive turbulence and thereby increase the virial ratio of the gas, which quenches the star formation. Then as feedback from these stars’ fades, gas can again accumulate and the cycle repeats. The estimated cycle timescale for a Mil ...
Carl Sagan - Cosmos (1980) [Full Color Illustrated
... neutrinos. Some proposed explanations are listed. In Chapter 10 we wonder whether there is enough matter in the universe eventually to stop the recession of distant galaxies, and whether the universe is infinitely old and therefore uncreated. Some light on both these questions may since have been ca ...
... neutrinos. Some proposed explanations are listed. In Chapter 10 we wonder whether there is enough matter in the universe eventually to stop the recession of distant galaxies, and whether the universe is infinitely old and therefore uncreated. Some light on both these questions may since have been ca ...
Science Bowl Questions and Answers
... ASTR-91; Short Answer: I am a type of star with a relatively low effective temperature (3,000 to 4,000 Kelvins), and have a large radius-about 100 times that of the Sun. What am I? ANSWER: RED GIANT ASTR-91; Short Answer: A 5th magnitude star is how many times brighter than an 8th magnitude star? AN ...
... ASTR-91; Short Answer: I am a type of star with a relatively low effective temperature (3,000 to 4,000 Kelvins), and have a large radius-about 100 times that of the Sun. What am I? ANSWER: RED GIANT ASTR-91; Short Answer: A 5th magnitude star is how many times brighter than an 8th magnitude star? AN ...
abū`l faẓl, independent discoverer of the great comet of 1577
... thunder and lightning and such other (phenomena) appeared. Many years and months had passed over this event, and then, in 803, a tailed comet appeared in the zenith at Rum (Constantinople). Mulana Abdallalasan and Mahiad-din Magrabi with other astrologers of that time informed Timur, that from what ...
... thunder and lightning and such other (phenomena) appeared. Many years and months had passed over this event, and then, in 803, a tailed comet appeared in the zenith at Rum (Constantinople). Mulana Abdallalasan and Mahiad-din Magrabi with other astrologers of that time informed Timur, that from what ...
Full Text - Departement Natuurkunde en Sterrenkunde
... One can detect stellar variability over a wide variety of time scales and amplitudes. In fact, at micromagnitude level, no star seems constant anymore. Stellar variations are of great scientific importance, as they provide insights into stellar structures and lives. Indeed, one way to probe the inte ...
... One can detect stellar variability over a wide variety of time scales and amplitudes. In fact, at micromagnitude level, no star seems constant anymore. Stellar variations are of great scientific importance, as they provide insights into stellar structures and lives. Indeed, one way to probe the inte ...
Observationes Cometarvm Anni 1618
... Abstract: The year 1618 in astronomy was a unique one in that it presented three bright cometary apparitions in quick succession. The comets created a sensation, and belonged to an era when Galileo‘s telescopic observations had created a paradigm shift in our perception of the heavens and Johannes K ...
... Abstract: The year 1618 in astronomy was a unique one in that it presented three bright cometary apparitions in quick succession. The comets created a sensation, and belonged to an era when Galileo‘s telescopic observations had created a paradigm shift in our perception of the heavens and Johannes K ...
LIGO I - Indico
... shifts slightly with each orbit such that its closest point to the Sun (or "perihelion") shifts forward with each pass. ...
... shifts slightly with each orbit such that its closest point to the Sun (or "perihelion") shifts forward with each pass. ...
Measuring distances to the edge of the local group
... the early solar system after the inner planets had formed. Two main formation models have been proposed. Wetherill (1980) proposed that planetesimals formed primarily from the agglomeration of dust within the solar nebula. Herndon (2004) showed that this model did not produce sufficiently massive pl ...
... the early solar system after the inner planets had formed. Two main formation models have been proposed. Wetherill (1980) proposed that planetesimals formed primarily from the agglomeration of dust within the solar nebula. Herndon (2004) showed that this model did not produce sufficiently massive pl ...