![On the nature of sn stars. I. A detailed abundance study](http://s1.studyres.com/store/data/015532048_1-99b6cf062fdbe46196fe7507ce68a63d-300x300.png)
On the nature of sn stars. I. A detailed abundance study
... The sn stars were first discoved by Abt & Levato when studying the spectral types in different open clusters. These stars present sharp Balmer lines, sharp metallic lines (C II, Si II, Ca II, Ti II, Fe II), and broad coreless He I lines. Some of the sn stars seem to be related to CP stars. Initially ...
... The sn stars were first discoved by Abt & Levato when studying the spectral types in different open clusters. These stars present sharp Balmer lines, sharp metallic lines (C II, Si II, Ca II, Ti II, Fe II), and broad coreless He I lines. Some of the sn stars seem to be related to CP stars. Initially ...
Is there a Supermassive Black Hole at the Center of the Milky Way?
... Continued monitoring of the positions of stars, with increasing positional accuracy, led to clear detections of acceleration (ie, curving motions on the sky)35,36 . Importantly, the directions of the acceleration vectors “pointed” to a common central gravitational source very close to the position o ...
... Continued monitoring of the positions of stars, with increasing positional accuracy, led to clear detections of acceleration (ie, curving motions on the sky)35,36 . Importantly, the directions of the acceleration vectors “pointed” to a common central gravitational source very close to the position o ...
Stars: HR Diagaram Stellar Evolution Astronomy 1 — Elementary Astronomy LA Mission College
... A. more main sequence stars than red giants. B. more red giants than main sequence stars. C. the same number of red giants as main sequence stars. Astronomy 1 - Elementary Astronomy ...
... A. more main sequence stars than red giants. B. more red giants than main sequence stars. C. the same number of red giants as main sequence stars. Astronomy 1 - Elementary Astronomy ...
Project Description - SDSS-III
... Universe imprint a characteristic scale on the clustering of dark matter, galaxies, and intergalactic gas. By measuring this scale with tracers seen at different redshifts, we can create a “Hubble diagram” of unprecedented precision covering most of cosmic history and can thereby pin down the prope ...
... Universe imprint a characteristic scale on the clustering of dark matter, galaxies, and intergalactic gas. By measuring this scale with tracers seen at different redshifts, we can create a “Hubble diagram” of unprecedented precision covering most of cosmic history and can thereby pin down the prope ...
Standardized Test Prep Chapter 30 Multiple Choice, continued
... Distances to Stars • light-year the distance that light travels in one year. • Distances between the stars and Earth are measured in lightyears. • parallax an apparent shift in the position of an object when viewed from different locations. • For relatively close stars, scientists determine a star’s ...
... Distances to Stars • light-year the distance that light travels in one year. • Distances between the stars and Earth are measured in lightyears. • parallax an apparent shift in the position of an object when viewed from different locations. • For relatively close stars, scientists determine a star’s ...
Chapter 30 - Todd County Schools
... Distances to Stars • light-year the distance that light travels in one year. • Distances between the stars and Earth are measured in lightyears. • parallax an apparent shift in the position of an object when viewed from different locations. • For relatively close stars, scientists determine a star’s ...
... Distances to Stars • light-year the distance that light travels in one year. • Distances between the stars and Earth are measured in lightyears. • parallax an apparent shift in the position of an object when viewed from different locations. • For relatively close stars, scientists determine a star’s ...
PPT
... Redshift & Variability • Redshift is defined by z = change in wavelength divided by original wavelength Usually, z = v/c and so z = 0.2 20% speed of light But quasars with z = 6 have been found. This does NOT mean a velocity = 6x the speed of light!!! Why? Because the redshift is cosmological – d ...
... Redshift & Variability • Redshift is defined by z = change in wavelength divided by original wavelength Usually, z = v/c and so z = 0.2 20% speed of light But quasars with z = 6 have been found. This does NOT mean a velocity = 6x the speed of light!!! Why? Because the redshift is cosmological – d ...
Digital STARLAB Teachers Guide
... projection system in its price range for portable and small fixed domes. The projector features a custom fisheye lens (patent pending) capable of depicting an accurate, high-contrast, simulated night sky with the capacity to explore a multitude of motions and displays eliminating the need for addition ...
... projection system in its price range for portable and small fixed domes. The projector features a custom fisheye lens (patent pending) capable of depicting an accurate, high-contrast, simulated night sky with the capacity to explore a multitude of motions and displays eliminating the need for addition ...
Discovery and spectroscopy of the young Jovian planet
... 51 Eri b and the GJ 3305 binary form a hierarchical triple configuration (28), but the companion pair is far enough away that the planet is expected to be dynamically stable in its current orbit (13). Moreover, the young age of the system suggests that while long-term dynamical effects such as secul ...
... 51 Eri b and the GJ 3305 binary form a hierarchical triple configuration (28), but the companion pair is far enough away that the planet is expected to be dynamically stable in its current orbit (13). Moreover, the young age of the system suggests that while long-term dynamical effects such as secul ...
1998 - Universitäts-Sternwarte München
... stellar parameters, notably the surface gravity and metal abundance scale. The spectroscopic distance scale is found in good agreement with the Hipparcos parallaxes and is characterized by a 5% rms uncertainty. The results suggest a precision in log g of 0:1 dex, and 0:05 , 0:10 dex for the metall ...
... stellar parameters, notably the surface gravity and metal abundance scale. The spectroscopic distance scale is found in good agreement with the Hipparcos parallaxes and is characterized by a 5% rms uncertainty. The results suggest a precision in log g of 0:1 dex, and 0:05 , 0:10 dex for the metall ...
Binarity in carbon-enhanced metal-poor stars
... s-process elements (Herwig 2004), or some rotating AGB companions (Herwig, Langer & Lugaro 2003; Siess, Goriely & Langer 2004). However, this result is dependent on the parameters adopted, as shown by Piersanti, Cristallo & Straniero (2013). Komiya et al. (2007) argue that relative high-mass AGB sta ...
... s-process elements (Herwig 2004), or some rotating AGB companions (Herwig, Langer & Lugaro 2003; Siess, Goriely & Langer 2004). However, this result is dependent on the parameters adopted, as shown by Piersanti, Cristallo & Straniero (2013). Komiya et al. (2007) argue that relative high-mass AGB sta ...
The Norma cluster (ACO3627) – II. The near-infrared Ks
... telescope at the South African Astronomical Observatory (SAAO) site in Sutherland. SIRIUS allows simultaneous observations in the J (λ = 1.26 μm), H (λ = 1.63 μm) and K s (λ = 2.14 μm) bands. It has three 1024 × 1024 HgCdTe (HAWAII) arrays. The field of view is approximately 7.8 × 7.8 arcmin2 and th ...
... telescope at the South African Astronomical Observatory (SAAO) site in Sutherland. SIRIUS allows simultaneous observations in the J (λ = 1.26 μm), H (λ = 1.63 μm) and K s (λ = 2.14 μm) bands. It has three 1024 × 1024 HgCdTe (HAWAII) arrays. The field of view is approximately 7.8 × 7.8 arcmin2 and th ...
Astronomy 112 - Solar Physics and Space Weather
... geologic features. These features can be compared to geologic features on Earth. Some geologists categorize the processes that shape the crust of the Earth into four categories. These four categories are erosion, volcanism, impact cratering, and tectonism. These categories may also be applied to Mar ...
... geologic features. These features can be compared to geologic features on Earth. Some geologists categorize the processes that shape the crust of the Earth into four categories. These four categories are erosion, volcanism, impact cratering, and tectonism. These categories may also be applied to Mar ...
Article PDF - IOPscience
... Neptune and other hypothetical massive planetary embryos or of its temporary capture in a resonance with one of the other planets, although these scenarios have never been quantitatively simulated. In this section we investigate the effects that an eccentric Neptune would have on the formation of th ...
... Neptune and other hypothetical massive planetary embryos or of its temporary capture in a resonance with one of the other planets, although these scenarios have never been quantitatively simulated. In this section we investigate the effects that an eccentric Neptune would have on the formation of th ...
Ch17_Galaxies
... Galaxy Clusters • In general, all clusters need dark matter to explain galactic motions and the confinement of hot intergalactic gas within cluster • Near clusters appear to have their members fairly smoothly spread out, while far away clusters (and hence younger clusters) are more ragged looking – ...
... Galaxy Clusters • In general, all clusters need dark matter to explain galactic motions and the confinement of hot intergalactic gas within cluster • Near clusters appear to have their members fairly smoothly spread out, while far away clusters (and hence younger clusters) are more ragged looking – ...
Lecture 9: The interstellar medium (ISM)
... • Number along a given lines of sight in glactic plane ~ 7 or 8/kpc • Typical size a few pc to a few tens of parsecs • Typical mass MHI ~ 100 M⊙ • Temperature T ~ 90 K • Radio emission λ = 21 cm, frequency f = 1420.406 MHz ...
... • Number along a given lines of sight in glactic plane ~ 7 or 8/kpc • Typical size a few pc to a few tens of parsecs • Typical mass MHI ~ 100 M⊙ • Temperature T ~ 90 K • Radio emission λ = 21 cm, frequency f = 1420.406 MHz ...
The Kuiper Belt Explored by Serendipitous Stellar Occultations
... The characteristic scale of the Fresnel diffraction effect (i.e., roughly speaking, the broadening of the object shadow) is the so-called Fresnel scale Fs = (λD/2) (Warner, 1988). [Note that some authors give different definitions for the Fresnel scale: (λD/2π) , (λD) , or (λD)/2 .] The Fresnel scal ...
... The characteristic scale of the Fresnel diffraction effect (i.e., roughly speaking, the broadening of the object shadow) is the so-called Fresnel scale Fs = (λD/2) (Warner, 1988). [Note that some authors give different definitions for the Fresnel scale: (λD/2π) , (λD) , or (λD)/2 .] The Fresnel scal ...
Spectroscopic Atlas for Amateur Astronomers
... wavelength ranges. Some of them are listed in the bibliography. For some of the brighter stars monographs are available, with fully commented spectra of e.g. Sirius, Procyon and Aldebaran. Unfortunately, such papers are mostly available as “abstracts” only. The download prices for the full versions ...
... wavelength ranges. Some of them are listed in the bibliography. For some of the brighter stars monographs are available, with fully commented spectra of e.g. Sirius, Procyon and Aldebaran. Unfortunately, such papers are mostly available as “abstracts” only. The download prices for the full versions ...
The Celestial Origin of Atoms
... Aims and aspirations of nuclear astrophysics The aim of nuclear astrophysics is threefold. Firstly, it seeks to determine the mechanisms whereby the various nuclear species occurring in nature are built up, from deuterium with its two nucleons to uranium with 238 nucleons. Secondly, it seeks to iden ...
... Aims and aspirations of nuclear astrophysics The aim of nuclear astrophysics is threefold. Firstly, it seeks to determine the mechanisms whereby the various nuclear species occurring in nature are built up, from deuterium with its two nucleons to uranium with 238 nucleons. Secondly, it seeks to iden ...
Ursa Minor
![](https://en.wikipedia.org/wiki/Special:FilePath/Sidney_Hall_-_Urania's_Mirror_-_Draco_and_Ursa_Minor.jpg?width=300)
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.