Mn, Cu, and Zn abundances in barium stars and their correlations
... In the present work we derived the abundances based on a spectrum synthesis for 14 stars that were previously analyzed by Smiljanic et al. (2007). Although the focus of this paper is on performing relations between abundances of some iron peak and heavy elements, other elements than those discussed ...
... In the present work we derived the abundances based on a spectrum synthesis for 14 stars that were previously analyzed by Smiljanic et al. (2007). Although the focus of this paper is on performing relations between abundances of some iron peak and heavy elements, other elements than those discussed ...
The Chemical Composition of Carbon-Rich, Very Metal
... this purpose, extensive surveys of metal-deficient stars have been carried out (e.g., the HK survey of Beers, Preston & Shectman 1992; Beers 1999), which have identified objects as metal-poor as [Fe/H]= −4 5 . One unexpected result of the HK survey is that many (∼ 10-15%) of the most metal-poor star ...
... this purpose, extensive surveys of metal-deficient stars have been carried out (e.g., the HK survey of Beers, Preston & Shectman 1992; Beers 1999), which have identified objects as metal-poor as [Fe/H]= −4 5 . One unexpected result of the HK survey is that many (∼ 10-15%) of the most metal-poor star ...
The first carbon-enhanced metal-poor star found in the Sculptor
... spheroidal galaxies around the Milky Way. Here we present detailed abundances from ESO VLT/UVES high-resolution spectroscopy for ET0097, the first CEMP star found in the Sculptor dwarf spheroidal, which is one of the best studied dwarf galaxies in the Local Group. This star has [Fe/H] = −2.03 ± 0.10 ...
... spheroidal galaxies around the Milky Way. Here we present detailed abundances from ESO VLT/UVES high-resolution spectroscopy for ET0097, the first CEMP star found in the Sculptor dwarf spheroidal, which is one of the best studied dwarf galaxies in the Local Group. This star has [Fe/H] = −2.03 ± 0.10 ...
FIELD ASTRONOMY
... moves from the Southern Hemisphere of the celestial sphere to the Northern Hemisphere and back. The point where the sun crosses the celestial equator in its movement from south to north along the ecliptic is known as the vernal equinox, the first day of spring. The vernal equinox is the first point ...
... moves from the Southern Hemisphere of the celestial sphere to the Northern Hemisphere and back. The point where the sun crosses the celestial equator in its movement from south to north along the ecliptic is known as the vernal equinox, the first day of spring. The vernal equinox is the first point ...
The Astronomers of Nabta Playa
... after thousands of years of silence? Their designers placed them in straight lines that radiate out from a central point. The arrangement employed a simple star-coordinate system that assigned two stones per star. One aligned with the star itself and marked its vernal equinox heliacal (i.e., rising ...
... after thousands of years of silence? Their designers placed them in straight lines that radiate out from a central point. The arrangement employed a simple star-coordinate system that assigned two stones per star. One aligned with the star itself and marked its vernal equinox heliacal (i.e., rising ...
POSTERS SESSION I: Atmospheres of Massive Stars
... Independently of the possibility of internally generated fields, there are good reasons to believe that massive stars actually harbour significant magnetic fields of fossil origin. As the ISM itself possesses organized, largescale magnetic fields, it is unavoidable because of magnetic flux conservat ...
... Independently of the possibility of internally generated fields, there are good reasons to believe that massive stars actually harbour significant magnetic fields of fossil origin. As the ISM itself possesses organized, largescale magnetic fields, it is unavoidable because of magnetic flux conservat ...
Astronomy and Astrophysics (ASTRO) Iowa State University – 2013-2014 1
... ASTRO 102. North Star Astronomy. Cr. 1. F.S. An entirely web-based course covering topics in observing the sky and navigation by the stars for students with little or no previous experience. The course combines material on common naked-eye phenomena, such as daily and seasonal variations in the sky, ...
... ASTRO 102. North Star Astronomy. Cr. 1. F.S. An entirely web-based course covering topics in observing the sky and navigation by the stars for students with little or no previous experience. The course combines material on common naked-eye phenomena, such as daily and seasonal variations in the sky, ...
Behaviour of elements from lithium to europium in stars with and
... online ELODIE reduction software, while the order deblazing and the cosmic, telluric lines and bad pixel removal were performed following the recipes described in Katz et al. (1998). Further treatment of spectra (the continuous spectrum level placement, measurement of the equivalent widths etc.) was ...
... online ELODIE reduction software, while the order deblazing and the cosmic, telluric lines and bad pixel removal were performed following the recipes described in Katz et al. (1998). Further treatment of spectra (the continuous spectrum level placement, measurement of the equivalent widths etc.) was ...
Building a model astrolabe - In-The
... climates for use at different latitudes. Usually the womb was deep enough that all of the climates could be stacked within for convenient storage. In Figure 2, for simplicity, only a single climate is provided for latitude 52°N and it is incorporated into the image of the front of the mother. In the ...
... climates for use at different latitudes. Usually the womb was deep enough that all of the climates could be stacked within for convenient storage. In Figure 2, for simplicity, only a single climate is provided for latitude 52°N and it is incorporated into the image of the front of the mother. In the ...
Wolf-Rayet Stars
... and must be incorporated into stellar evolutionary calculations. The (average) maximum velocity of material in W-R winds (called the terminal velocity, V∞ ) ranges from 800 km s−1 to in excess of 3000 km s−1 , and typically exceeds the escape velocity from the surface of the star. It is generally be ...
... and must be incorporated into stellar evolutionary calculations. The (average) maximum velocity of material in W-R winds (called the terminal velocity, V∞ ) ranges from 800 km s−1 to in excess of 3000 km s−1 , and typically exceeds the escape velocity from the surface of the star. It is generally be ...
CHAPTER 1 The Formation and Structure of Stars
... intervening gas and dust—clear evidence of an interstellar medium. – At near-infrared wavelengths, stars are more easily seen through the dusty interstellar medium because those longer wavelengths are scattered less often. – The interstellar medium is very cold—10 to 50 K. ...
... intervening gas and dust—clear evidence of an interstellar medium. – At near-infrared wavelengths, stars are more easily seen through the dusty interstellar medium because those longer wavelengths are scattered less often. – The interstellar medium is very cold—10 to 50 K. ...
Life Histories Of Some Stars
... all? Describe the shape of the graph? Is it a straight line? A curve? 5. Give each group the list of stars attached and the HR diagram attached. Instead of height and weight, the information is in Luminosity (compared to sun) and Surface Temperature (in K). The chart also gives the star’s current st ...
... all? Describe the shape of the graph? Is it a straight line? A curve? 5. Give each group the list of stars attached and the HR diagram attached. Instead of height and weight, the information is in Luminosity (compared to sun) and Surface Temperature (in K). The chart also gives the star’s current st ...
Superstars of Astronomy: Debra Fischer transcript
... So the scope of things was almost dizzying and, as I said, unsettling to me. Then I remember the second punch was when I ordered copies of the Palomar Observatory Sky Survey from the Caltech bookstore. They came in three flavors. Each picture was the same part of the sky, but one was taken with a re ...
... So the scope of things was almost dizzying and, as I said, unsettling to me. Then I remember the second punch was when I ordered copies of the Palomar Observatory Sky Survey from the Caltech bookstore. They came in three flavors. Each picture was the same part of the sky, but one was taken with a re ...
Deep SDSS optical spectroscopy of distant halo stars I. Atmospheric
... exceptions are some of the SEGUE fields at low Galactic latitude. With an absolute magnitude Mg ∼ 5, F-type halo turnoff stars observed by the SDSS/BOSS spectrographs are located at distances out to a few tens of kpc, and more evolved, horizontalbranch stars with similar temperatures are at distance ...
... exceptions are some of the SEGUE fields at low Galactic latitude. With an absolute magnitude Mg ∼ 5, F-type halo turnoff stars observed by the SDSS/BOSS spectrographs are located at distances out to a few tens of kpc, and more evolved, horizontalbranch stars with similar temperatures are at distance ...
Distance determination for RAVE stars using stellar models
... Although pulsating variables can provide accurate tracer populations, the numbers of such stars is clearly limited; ideally we would like to determine distances for large numbers of stars and not just specific populations. As a consequence there have been numerous studies utilising photometric dista ...
... Although pulsating variables can provide accurate tracer populations, the numbers of such stars is clearly limited; ideally we would like to determine distances for large numbers of stars and not just specific populations. As a consequence there have been numerous studies utilising photometric dista ...
diy astronomy - American Museum of Natural History
... Activity 2: Using a Galileoscope – For Your Eyes Only! NAME: Before film or digital cameras existed, astronomers used only their eyes as detectors. They would use telescopes to gather more light from the objects they detected. [right?] Galileo Galilei was the first astronomer to use a telescope for ...
... Activity 2: Using a Galileoscope – For Your Eyes Only! NAME: Before film or digital cameras existed, astronomers used only their eyes as detectors. They would use telescopes to gather more light from the objects they detected. [right?] Galileo Galilei was the first astronomer to use a telescope for ...
(a) Mean solar time
... This is done by referring the equatorial coordinates (α,δ) to the mean equator and equinox for the time of observation, instead of the true equator and equinox. The mean position still has the effects of precession and proper motion included. This is the position actually used in star catalogues. Me ...
... This is done by referring the equatorial coordinates (α,δ) to the mean equator and equinox for the time of observation, instead of the true equator and equinox. The mean position still has the effects of precession and proper motion included. This is the position actually used in star catalogues. Me ...
Isotopic composition of Hg and Pt in 5 slowly rotating HgMn stars *
... peculiarities in the spectra of HgMn stars have not been suciently constrained so far by the available abundance data. Previous studies of Hg and Pt in samples of HgMn stars often relied on spectra of rather low resolution and low S/N ratio, so that only limited information could be derived from th ...
... peculiarities in the spectra of HgMn stars have not been suciently constrained so far by the available abundance data. Previous studies of Hg and Pt in samples of HgMn stars often relied on spectra of rather low resolution and low S/N ratio, so that only limited information could be derived from th ...
Star 1 A star is a massive, luminous ball of plasma held together by
... Neptune were also Greek and Roman gods, but neither planet was known in Antiquity because of their low brightness. Their names were assigned by later astronomers.) Circa 1600, the names of the constellations were used to name the stars in the corresponding regions of the sky. The German astronomer J ...
... Neptune were also Greek and Roman gods, but neither planet was known in Antiquity because of their low brightness. Their names were assigned by later astronomers.) Circa 1600, the names of the constellations were used to name the stars in the corresponding regions of the sky. The German astronomer J ...
103-122
... early Galaxy were poorly mixed, one may expect, as earlier and earlier generations of stars are examined, [α/Fe] to show an increasing scatter with decreasing [Fe/H]. Also, halo stars now in the solar neighbourhood and having the same [Fe/H] may have come from more diverse birthplaces than the disc ...
... early Galaxy were poorly mixed, one may expect, as earlier and earlier generations of stars are examined, [α/Fe] to show an increasing scatter with decreasing [Fe/H]. Also, halo stars now in the solar neighbourhood and having the same [Fe/H] may have come from more diverse birthplaces than the disc ...
Protostellar/PMS Mass Infall Luminosity Problem
... sample from 112 to 230 protostars, but 100 of the new sources lacks sub-mm detections, so their totoal luminosity is underestimated by a factor of 2.6 on average (could be up to 10). The low luminosity tail of the PLF is very uncertain ...
... sample from 112 to 230 protostars, but 100 of the new sources lacks sub-mm detections, so their totoal luminosity is underestimated by a factor of 2.6 on average (could be up to 10). The low luminosity tail of the PLF is very uncertain ...
Planetary Nebulae: Observational Properties, Mimics, and Diagnostics
... Abstract: The total number of true, likely and possible planetary nebulae (PN) now known in the Milky Way is nearly 3000, double the number known a decade ago. The new discoveries are a legacy of the recent availability of wide field, narrowband imaging surveys, primarily in the light of H-alpha. In ...
... Abstract: The total number of true, likely and possible planetary nebulae (PN) now known in the Milky Way is nearly 3000, double the number known a decade ago. The new discoveries are a legacy of the recent availability of wide field, narrowband imaging surveys, primarily in the light of H-alpha. In ...
Astrometric accuracy during the past 2000 years
... Internal errors of observations are obtained by analysis of repeated observations of the same stars at different times, as is usually done in meridian observation catalogues, e.g. in case of USNO (1920) from the n=10 observations. I have then derived the error for Table 1 by division with sqrt(10) b ...
... Internal errors of observations are obtained by analysis of repeated observations of the same stars at different times, as is usually done in meridian observation catalogues, e.g. in case of USNO (1920) from the n=10 observations. I have then derived the error for Table 1 by division with sqrt(10) b ...
FIXED STARS - Saptarishis Magazine
... DKR: When I began my research, I thought I’d write a normal-sized book. (Okay, maybe a fat book!) It would simply have more stars than the other books out there, with more up-todate research and new interpretations based on my research. I presumed that what the other books said was probably true, b ...
... DKR: When I began my research, I thought I’d write a normal-sized book. (Okay, maybe a fat book!) It would simply have more stars than the other books out there, with more up-todate research and new interpretations based on my research. I presumed that what the other books said was probably true, b ...
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.