– 1 – 1. Galaxy Observations 1.1.
... proceeds to use the above characterizations to study the relations between stellar mass, star formation history, size, and internal structure (concentration of light and surface mass density) in low redshift SDSS galaxies. Many of these trends (for example, that lower mass galaxies have younger stel ...
... proceeds to use the above characterizations to study the relations between stellar mass, star formation history, size, and internal structure (concentration of light and surface mass density) in low redshift SDSS galaxies. Many of these trends (for example, that lower mass galaxies have younger stel ...
1998 - Universitäts-Sternwarte München
... stars, can be compared with the convolved solar spectrum to derive the respective instrumental profiles. There are at least two other large scale motions that contribute to the observed line profiles: (i) stellar rotation, or, more precise, the projected rotational velocity vsini, with i as the usua ...
... stars, can be compared with the convolved solar spectrum to derive the respective instrumental profiles. There are at least two other large scale motions that contribute to the observed line profiles: (i) stellar rotation, or, more precise, the projected rotational velocity vsini, with i as the usua ...
Untitled - NMSU Astronomy
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
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 ...
“XRbinary”: A Program to Calculate the Orbital Light Curves of X
... where, once again, the normalization constant K is set to give the desired total disk luminosity through equation 27. The main disk may also have localized spots that are hotter or colder than the temperature given by equation 26. The properties of each spot are specified by its boundaries in ζ and ...
... where, once again, the normalization constant K is set to give the desired total disk luminosity through equation 27. The main disk may also have localized spots that are hotter or colder than the temperature given by equation 26. The properties of each spot are specified by its boundaries in ζ and ...
On the nature of sn stars. I. A detailed abundance study
... respectively (Wolff & Preston 1978; Abt & Moyd 1973). More recent works also present similar maximum values for CP stars (see e.g. Abt & Morrel 1995; Abt 2009). Mermilliod (1983) examined sn cluster stars and concluded that their main feature is also a low projected rotational velocity: 12 out of 16 ...
... respectively (Wolff & Preston 1978; Abt & Moyd 1973). More recent works also present similar maximum values for CP stars (see e.g. Abt & Morrel 1995; Abt 2009). Mermilliod (1983) examined sn cluster stars and concluded that their main feature is also a low projected rotational velocity: 12 out of 16 ...
View
... computer automated technology. Simple and friendly to use, the LCM telescope is up and running after locating just three bright celestial objects. It’s the perfect combination of power and portability. If you are new to astronomy, you may wish to start off by using the LCM's built-in Sky Tour featur ...
... computer automated technology. Simple and friendly to use, the LCM telescope is up and running after locating just three bright celestial objects. It’s the perfect combination of power and portability. If you are new to astronomy, you may wish to start off by using the LCM's built-in Sky Tour featur ...
Unraveling the Helix Nebula: Its Structure and Knots
... of material, surrounded by a lower ionization outer-ring that is almost perpendicular to the inner-disk. This interpretation is strengthened by its explanation of the complex radial velocity pattern described by radio and optical observations. There is an outer structure called the outermost-ring wh ...
... of material, surrounded by a lower ionization outer-ring that is almost perpendicular to the inner-disk. This interpretation is strengthened by its explanation of the complex radial velocity pattern described by radio and optical observations. There is an outer structure called the outermost-ring wh ...
A Zoo of Galaxies - Portsmouth Research Portal
... The variety of different galaxies observed in the sky naturally caused people to wonder what they were. The scientific arguments surrounding this question at the start of the 20th century, are best represented perhaps, by the public debate held in 1920 between Heber Curtis and Harlow Shapley. Many o ...
... The variety of different galaxies observed in the sky naturally caused people to wonder what they were. The scientific arguments surrounding this question at the start of the 20th century, are best represented perhaps, by the public debate held in 1920 between Heber Curtis and Harlow Shapley. Many o ...
Magnetic cycles of Sun-like stars with different levels of coronal and
... The most sensitive indicator of the chromospheric activity (CA) is the Mount Wilson S - index (SHK ) - the ratio of the core of the CaII H&K lines to the nearby continuum (Vaugan & Preston 1980). Now the CaII H&K emission was established as the main indicator of CA in lower main sequence stars. The ...
... The most sensitive indicator of the chromospheric activity (CA) is the Mount Wilson S - index (SHK ) - the ratio of the core of the CaII H&K lines to the nearby continuum (Vaugan & Preston 1980). Now the CaII H&K emission was established as the main indicator of CA in lower main sequence stars. The ...
A Zoo of Galaxies
... The variety of different galaxies observed in the sky naturally caused people to wonder what they were. The scientific arguments surrounding this question at the start of the 20th century, are best represented perhaps, by the public debate held in 1920 between Heber Curtis and Harlow Shapley. Many o ...
... The variety of different galaxies observed in the sky naturally caused people to wonder what they were. The scientific arguments surrounding this question at the start of the 20th century, are best represented perhaps, by the public debate held in 1920 between Heber Curtis and Harlow Shapley. Many o ...
Pulsed Accretion in the Young Binary &
... or a substantial change in photospheric spectra. These stars become bluer and have increasing W (H a) as they fade. ...
... or a substantial change in photospheric spectra. These stars become bluer and have increasing W (H a) as they fade. ...
book_text4
... space astronomy mission ever. The images included in this beautiful volume are quite staggering in what they reveal about the Universe we live in and have already become part of our common scientific and cultural heritage. But what about the science impact? It is no exaggeration to say that the scie ...
... space astronomy mission ever. The images included in this beautiful volume are quite staggering in what they reveal about the Universe we live in and have already become part of our common scientific and cultural heritage. But what about the science impact? It is no exaggeration to say that the scie ...
Variations in the Star Formation Efficiency of the Dense Molecular
... We present a new survey of HCN (1–0) emission, a tracer of dense molecular gas, focused on the littleexplored regime of normal star-forming galaxy disks. Combining HCN, CO, and infrared (IR) emission, we investigate the role of dense gas in star formation, finding systematic variations in both the a ...
... We present a new survey of HCN (1–0) emission, a tracer of dense molecular gas, focused on the littleexplored regime of normal star-forming galaxy disks. Combining HCN, CO, and infrared (IR) emission, we investigate the role of dense gas in star formation, finding systematic variations in both the a ...
The Evolution of Star Formation Activity in . Cory R. Wagner
... In this thesis, we explore 7.5 billion years of evolution in cluster galaxy star formation activity using a sample of 11 high-redshift (1 < z < 1.5) clusters from the IRAC Shallow Cluster Survey, and 25 low-redshift (0.15 < z < 1) clusters from The Cluster Lensing And Supernova survey with Hubble. W ...
... In this thesis, we explore 7.5 billion years of evolution in cluster galaxy star formation activity using a sample of 11 high-redshift (1 < z < 1.5) clusters from the IRAC Shallow Cluster Survey, and 25 low-redshift (0.15 < z < 1) clusters from The Cluster Lensing And Supernova survey with Hubble. W ...
Building galaxies Hunt, Leslie Kipp
... Perhaps the most beautiful sight in the night sky visible to the naked eye is our own galaxy, the Via Lactea or Milky Way. That it was composed of individual stars was recognized only in the early seventeenth century by Galileo with his telescope; this was the beginning of the study of galaxies as s ...
... Perhaps the most beautiful sight in the night sky visible to the naked eye is our own galaxy, the Via Lactea or Milky Way. That it was composed of individual stars was recognized only in the early seventeenth century by Galileo with his telescope; this was the beginning of the study of galaxies as s ...
Lab 14 Galaxy Morphology
... appeared similar to comets, but did not move. Others of these nebulae were resolved into clusters of stars as bigger telescopes were constructed, and used to examine them. Some of these fuzzy nebulae, however, did not break-up into stars no matter how big a telescope was used to look at them. While ...
... appeared similar to comets, but did not move. Others of these nebulae were resolved into clusters of stars as bigger telescopes were constructed, and used to examine them. Some of these fuzzy nebulae, however, did not break-up into stars no matter how big a telescope was used to look at them. While ...
Statistical properties of a sample of periodically variable B-type supergiants ⋆
... than 9th mag in the sample by Waelkens et al. (1998) which fitted the observation window of the assigned telescope time. This concerns 21 stars. To this we added 10 more candidate α Cyg variables from the Catalogue of Periodic Variables of HIPPARCOS (ESA 1997), in such way that the complete sample f ...
... than 9th mag in the sample by Waelkens et al. (1998) which fitted the observation window of the assigned telescope time. This concerns 21 stars. To this we added 10 more candidate α Cyg variables from the Catalogue of Periodic Variables of HIPPARCOS (ESA 1997), in such way that the complete sample f ...
Physical Properties of the Gas and Dust in the Orion B Molecular
... The Orion B Molecular Cloud (L 1630) is the northern one of the two major GMCs in the Orion complex (see Chapter of Bally & Heiles). It extends over 40 × 60 pc (6◦ × 8◦ ) northward from the Orion Nebula and contains several wellknown star-forming regions such as NGC 2071, NGC 2068, M 78 (HH 19–27), ...
... The Orion B Molecular Cloud (L 1630) is the northern one of the two major GMCs in the Orion complex (see Chapter of Bally & Heiles). It extends over 40 × 60 pc (6◦ × 8◦ ) northward from the Orion Nebula and contains several wellknown star-forming regions such as NGC 2071, NGC 2068, M 78 (HH 19–27), ...
ABSTRACT Exoplanet Habitability and an Analysis of Gliese 436 b
... foreground star’s orbiting exoplanet will cause a deviation in the expected magnifying lens curve from the light of the background star.7 This method is best suited for identifying exoplanets with masses between Earth’s and Jupiter’s and a semi-major axis of about 1-5 AU around the foreground star.7 ...
... foreground star’s orbiting exoplanet will cause a deviation in the expected magnifying lens curve from the light of the background star.7 This method is best suited for identifying exoplanets with masses between Earth’s and Jupiter’s and a semi-major axis of about 1-5 AU around the foreground star.7 ...
AR2012 - Vatican Observatory
... from Star Cluster Ecology to Tracers of Galaxy Evolution. In 1985, the late Fr. Martin McCarthy S.J., an astronomer at the Observatory, recognized that there was too little contact between the astronomers at the Observatory and younger researchers. His solution was to open the observatory to student ...
... from Star Cluster Ecology to Tracers of Galaxy Evolution. In 1985, the late Fr. Martin McCarthy S.J., an astronomer at the Observatory, recognized that there was too little contact between the astronomers at the Observatory and younger researchers. His solution was to open the observatory to student ...
LACEwING: A New Moving Group Analysis Code
... kinematic and spatial information. LACEwING works in right-handed Cartesian Galactic coordinates, with UVW space velocities and XYZ space positions, where the U/X axis is toward the Galactic center. The matrices of Johnson & Soderblom (1987) transform observational equatorial coordinates into UVW an ...
... kinematic and spatial information. LACEwING works in right-handed Cartesian Galactic coordinates, with UVW space velocities and XYZ space positions, where the U/X axis is toward the Galactic center. The matrices of Johnson & Soderblom (1987) transform observational equatorial coordinates into UVW an ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.