Fixed Stars Interview with Diana K. Rosenberg
... DKR: Astrology saved my son’s life! That convinced me to study it seriously. I was "trying out" astrology in New York City with Betty Lundsted. Betty taught the basics, and her friend Pat Morimando, upstairs in the same building, taught chart construction. This was back in 1975, before everyone had ...
... DKR: Astrology saved my son’s life! That convinced me to study it seriously. I was "trying out" astrology in New York City with Betty Lundsted. Betty taught the basics, and her friend Pat Morimando, upstairs in the same building, taught chart construction. This was back in 1975, before everyone had ...
Hot subdwarf stars-galactic orbits and distribution perpendicular to
... (small) sample had disk orbits but 1 star had an orbit with z-distance maxima ranging from 8 to 20 kpc. Evidence for more stars with halo orbits was given by de Boer et al. (1995). We have investigated 41 stars for their kinematic behaviour. The choice of stars was solely determined by the availabil ...
... (small) sample had disk orbits but 1 star had an orbit with z-distance maxima ranging from 8 to 20 kpc. Evidence for more stars with halo orbits was given by de Boer et al. (1995). We have investigated 41 stars for their kinematic behaviour. The choice of stars was solely determined by the availabil ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... quadratically with position in the frame. The relative magnitudes were determined with the ALLSTAR routine in DAOPHOT II in a single pass (i.e., no additional stars were subsequently found on PSF-subtracted images and added to the list of trial positions). The resulting lists of magnitudes and posit ...
... quadratically with position in the frame. The relative magnitudes were determined with the ALLSTAR routine in DAOPHOT II in a single pass (i.e., no additional stars were subsequently found on PSF-subtracted images and added to the list of trial positions). The resulting lists of magnitudes and posit ...
AUGUSTE COMTE`S BLUNDER: AN ACCOUNT OF THE FIRST
... this next step—the application of spectroscopy to stars, in the same way as Kirchhoff had done for the Sun—a natural one to undertake. The first person to embark on observing stellar spectra in the 1860s was Giovanni Donati (1826 –1873) in Florence. He used a single prism spectroscope on his 41-cm r ...
... this next step—the application of spectroscopy to stars, in the same way as Kirchhoff had done for the Sun—a natural one to undertake. The first person to embark on observing stellar spectra in the 1860s was Giovanni Donati (1826 –1873) in Florence. He used a single prism spectroscope on his 41-cm r ...
What To See Telescope(Jul-Sept) v1 - One
... (Athena) and hurled into the sky. The constellation was surely on Ptolemy’s list of 48 original constellations of the classical world. For much of the northern hemisphere, Draco is circumpolar, which means it never sets below the horizon. The tail of the dragon begins between the bowls of the Big an ...
... (Athena) and hurled into the sky. The constellation was surely on Ptolemy’s list of 48 original constellations of the classical world. For much of the northern hemisphere, Draco is circumpolar, which means it never sets below the horizon. The tail of the dragon begins between the bowls of the Big an ...
Abstracts - Physics of Evolved Stars 2015
... intermediate main-sequence mass (5-8 solar masses) stars before they evolve into the post-AGB and planetary-nebula stages. AGB stars lose most of their stellar envelope in the form of a gaseous and dusty stellar wind. This wind eventually grows to such high mass-loss rates that the central star beco ...
... intermediate main-sequence mass (5-8 solar masses) stars before they evolve into the post-AGB and planetary-nebula stages. AGB stars lose most of their stellar envelope in the form of a gaseous and dusty stellar wind. This wind eventually grows to such high mass-loss rates that the central star beco ...
Abd al-Rahman al-Sufi and his book of the fixed stars: a journey of
... A.D. 137. Al-Ṣūfī updated Ptolemy's stellar longitudes from A.D. 137 to 964 by adding 12 degrees and 42 minutes on Ptolemy’s longitude values to allow for precession. However, it is surprising that at present no English translation of al-Ṣūfī’s treatise exists. Therefore this is a Doctorate thesis w ...
... A.D. 137. Al-Ṣūfī updated Ptolemy's stellar longitudes from A.D. 137 to 964 by adding 12 degrees and 42 minutes on Ptolemy’s longitude values to allow for precession. However, it is surprising that at present no English translation of al-Ṣūfī’s treatise exists. Therefore this is a Doctorate thesis w ...
When we look at a neighboring galaxy (such as M31, the
... the distant object appears to remain mostly stationary. The easiest way to see this is to hold up your finger a few inches in front of your nose and look at something far away. Close one eye and then the other. Your finger appears to move back and forth while the distant object stays put. It turns o ...
... the distant object appears to remain mostly stationary. The easiest way to see this is to hold up your finger a few inches in front of your nose and look at something far away. Close one eye and then the other. Your finger appears to move back and forth while the distant object stays put. It turns o ...
Binarity in carbon-enhanced metal-poor stars
... Pb absorption lines are very weak and the strongest line in the optical overlaps with the CH feature, this hypothesis is difficult to test, especially in C-rich stars. A robust upper limit could nonetheless be given for the brightest CEMP-no star, BD +44-493, which did not show the predicted overabu ...
... Pb absorption lines are very weak and the strongest line in the optical overlaps with the CH feature, this hypothesis is difficult to test, especially in C-rich stars. A robust upper limit could nonetheless be given for the brightest CEMP-no star, BD +44-493, which did not show the predicted overabu ...
Chapter 3 How Earth and Sky Work
... In chapters 3 and 4 we will learn why our view of the heavens depends on our position on the Earth, the time of day, and the day of the year. We will explore views of the Earth, the sky, and an observer as seen from space and as seen from the surface of the Earth. Today we know that the Earth is a s ...
... In chapters 3 and 4 we will learn why our view of the heavens depends on our position on the Earth, the time of day, and the day of the year. We will explore views of the Earth, the sky, and an observer as seen from space and as seen from the surface of the Earth. Today we know that the Earth is a s ...
Fluorine abundances in dwarf stars of the solar neighbourhood⋆
... (Renda et al. 2004; Kobayashi et al. 2011). However, the relative contributions of the three F productors remains disputed. The targets observed so far are probably not the most appropriate one for deriving accurate F abundances. First, most of them are giant stars, where mixing may have occurred, c ...
... (Renda et al. 2004; Kobayashi et al. 2011). However, the relative contributions of the three F productors remains disputed. The targets observed so far are probably not the most appropriate one for deriving accurate F abundances. First, most of them are giant stars, where mixing may have occurred, c ...
Eye in the sky - Academy of Science of South Africa
... any altitude in the sky, although it can freely move around the horizon. The moving part of the telescope during an observation, and technologically the most complex, is what is called a ‘tracker’. This tracker is a metal structure carrying the science instruments above the primary mirror in the opp ...
... any altitude in the sky, although it can freely move around the horizon. The moving part of the telescope during an observation, and technologically the most complex, is what is called a ‘tracker’. This tracker is a metal structure carrying the science instruments above the primary mirror in the opp ...
Navigation: The Mariner`s Quadrant
... navigators could determine their latitude by measuring the angle (or elevation) between the horizon and Polaris. South of the equator, where the North Star is not visible, mariners would use the constellation known as the Southern Cross to determine their southern latitude. Located almost directly a ...
... navigators could determine their latitude by measuring the angle (or elevation) between the horizon and Polaris. South of the equator, where the North Star is not visible, mariners would use the constellation known as the Southern Cross to determine their southern latitude. Located almost directly a ...
About the Instructor`s Guide
... and Carl Sagan were major influences on the authors of this textbook. (In fact, the lead author changed his graduate study plans from biophysics to astrophysics as a result of watching the series.) Thus, while the series does not correspond directly to the textbook, it makes an outstanding resource ...
... and Carl Sagan were major influences on the authors of this textbook. (In fact, the lead author changed his graduate study plans from biophysics to astrophysics as a result of watching the series.) Thus, while the series does not correspond directly to the textbook, it makes an outstanding resource ...
The DBV stars: Progress and problems
... While it is possible that most or all of the cooler (Teff < 20,000 K) DA white dwarfs are the spawn of hydrogen-rich planetary nebula nuclei, the picture is less certain for the DBV and DB ’whitedwarfs. There are at least two possible progenitors of DB white dwarfs: the PG 1159 stars and the interac ...
... While it is possible that most or all of the cooler (Teff < 20,000 K) DA white dwarfs are the spawn of hydrogen-rich planetary nebula nuclei, the picture is less certain for the DBV and DB ’whitedwarfs. There are at least two possible progenitors of DB white dwarfs: the PG 1159 stars and the interac ...
Claudius Ptolemy
... Theon of Smyrna who almost certainly was his teacher. Certainly this would make sense since Theon was both an observer and a mathematician who had written on astronomical topics such as conjunctions, eclipses, occultations and transits. Most of Ptolemy's early works are dedicated to Syrus who may ha ...
... Theon of Smyrna who almost certainly was his teacher. Certainly this would make sense since Theon was both an observer and a mathematician who had written on astronomical topics such as conjunctions, eclipses, occultations and transits. Most of Ptolemy's early works are dedicated to Syrus who may ha ...
Astronomy Astrophysics
... 2. Atmospheric parameters and stellar masses The atmospheric parameters T eff and log g need to be known in order to compute synthetic Hα line profiles. Atmospheric parameters (T eff , log g) determined spectroscopically were preferred when available. Values for 12 stars were taken from Bergeron et al ...
... 2. Atmospheric parameters and stellar masses The atmospheric parameters T eff and log g need to be known in order to compute synthetic Hα line profiles. Atmospheric parameters (T eff , log g) determined spectroscopically were preferred when available. Values for 12 stars were taken from Bergeron et al ...
The empirical mass distribution of hot B subdwarfs
... the merger of two He white dwarfs. In a nutshell, CE evolution would produce sdB stars in close binary systems, while longer period binaries would result from RLOF, and the merger channel would explain the population of single sdB stars. These 3 scenarios have been studied in detail by [5, 6] from s ...
... the merger of two He white dwarfs. In a nutshell, CE evolution would produce sdB stars in close binary systems, while longer period binaries would result from RLOF, and the merger channel would explain the population of single sdB stars. These 3 scenarios have been studied in detail by [5, 6] from s ...
The Reception of the Copernican Revolution
... the decline of geocentrism:8 For three thousand years the skies and the stars were all in motion; everyone believed it; then Cleanthes of Samos, or according to Theophrastus, Nicetas of Syracuse decided to maintain that it was the Earth which did the moving, revolving on its axis through the oblique ...
... the decline of geocentrism:8 For three thousand years the skies and the stars were all in motion; everyone believed it; then Cleanthes of Samos, or according to Theophrastus, Nicetas of Syracuse decided to maintain that it was the Earth which did the moving, revolving on its axis through the oblique ...
Cycles of magnetic activity in solar-type stars. The place of the Sun
... false alarm probability (FAP) function. In the case when the calculated Pcyc ± ∆P the FAP function 6 10−9 this star is of "Excellent" class. Among these 50 stars with cycles they have found only 12 stars and the Sun to be characterized by the cyclic activity of the "Excellent" class. We illustrate t ...
... false alarm probability (FAP) function. In the case when the calculated Pcyc ± ∆P the FAP function 6 10−9 this star is of "Excellent" class. Among these 50 stars with cycles they have found only 12 stars and the Sun to be characterized by the cyclic activity of the "Excellent" class. We illustrate t ...
THE EVIDENCE FROM KNOSSOS ON THE MINOAN CALENDAR
... In our archaeoastronomical investigation of the peak sanctuaries on Petsophas (Henriksson and Blomberg 1996, Blomberg and Henriksson 1996, Blomberg 2006) and Mt Juktas (Blomberg, Henriksson and Papathanassiou 2002), we found good evidence for a lunisolar calendar that b ...
... In our archaeoastronomical investigation of the peak sanctuaries on Petsophas (Henriksson and Blomberg 1996, Blomberg and Henriksson 1996, Blomberg 2006) and Mt Juktas (Blomberg, Henriksson and Papathanassiou 2002), we found good evidence for a lunisolar calendar that b ...
Heliacal Rising of Canopus in Indian Astronomy
... significance, lies in its becoming circumpolar for different latitudes during different periods, usually in intervals of thousands of years. In this paper, we show how star Canopus which became circumpolar for an extreme North Indian latitude, attained some status after a couple of thousands of year ...
... significance, lies in its becoming circumpolar for different latitudes during different periods, usually in intervals of thousands of years. In this paper, we show how star Canopus which became circumpolar for an extreme North Indian latitude, attained some status after a couple of thousands of year ...
Observing Orion
... Horsehead is caused mostly by thick dust blocking the glow. This is very difficult object and until relatively recently it was thought to be unobservable by amateurs. It requires very clear skies and usually a large scope. A Hydrogen Beta filter is also generally required, although some references s ...
... Horsehead is caused mostly by thick dust blocking the glow. This is very difficult object and until relatively recently it was thought to be unobservable by amateurs. It requires very clear skies and usually a large scope. A Hydrogen Beta filter is also generally required, although some references s ...
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... Table 1 lists the 18 objects studied in this project with a number of important characteristics. The spectral type is a kind of “mean” value for what is found in the literature (using Vizier; Ochsenbein et al., 2000)1. The carbon star TW Hor is an exception in this sample. We include it because it w ...
... Table 1 lists the 18 objects studied in this project with a number of important characteristics. The spectral type is a kind of “mean” value for what is found in the literature (using Vizier; Ochsenbein et al., 2000)1. The carbon star TW Hor is an exception in this sample. We include it because it w ...
SEASONAL DATING OF SAPPHO`S `MIDNIGHT POEM` REVISITED
... ideas about cluster evaporation and dissolution (Converse and Stahler, 2010). Since the Pleiades consist of numerous hot, luminous, young stars, they also are of prime interest to those studying the early stages of stellar evolution, particularly mass-loss and stellar activityage relations (Cardini ...
... ideas about cluster evaporation and dissolution (Converse and Stahler, 2010). Since the Pleiades consist of numerous hot, luminous, young stars, they also are of prime interest to those studying the early stages of stellar evolution, particularly mass-loss and stellar activityage relations (Cardini ...
Constellation
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU). These areas had their origins in Western-traditional asterisms from which the constellations take their names. There are 88 officially recognized constellations, covering the entire sky.Thus, any given point in a celestial coordinate system can unambiguously be assigned to a constellation. It is usual in astronomy to give the constellation in which a given object is found along with its coordinates in order to convey a rough idea in which part of the sky it is located. For example, saying the Horsehead Nebula is near Orion's Belt in the constellation Orion immediately locates it just south of the ecliptic and conveys that it is best observable in winter from the Northern Hemisphere.