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Module 4.1 - The Scale of the Universe [slide 1] We now turn to
... [slide 12] Now, let's take a closer look to what happens when a star is pulsating. Its photosphere expands, but the temperature changes as well. So the radius changes, the temperature changes therefore, luminosity must change. If we observe stars spectroscopically, we can observe the velocity of th ...
... [slide 12] Now, let's take a closer look to what happens when a star is pulsating. Its photosphere expands, but the temperature changes as well. So the radius changes, the temperature changes therefore, luminosity must change. If we observe stars spectroscopically, we can observe the velocity of th ...
Document
... Brown et al. 2006 astro-ph 0609584 -- NOAO and Spitzer IRAC survey: “…the stellar mass contained within the red galaxy population has roughly doubled over the past 8Gyr. This is consistent with starforming galaxies being transformed into
... Brown et al. 2006 astro-ph 0609584 -- NOAO and Spitzer IRAC survey: “…the stellar mass contained within the red galaxy population has roughly doubled over the past 8Gyr. This is consistent with starforming galaxies being transformed into
Infrared Properties of Star-Forming Dwarf Galaxies. I. Dwarf Irregular
... 2003b; Richer & McCall 1995), samples were defined based on two criteria: 1. Detection of the [O iii] k4363 emission line for the determination of oxygen abundances. 2. A reliable distance (i.e., determined from stellar constituents, such as Cepheids and the tip of the RGB [TRGB]). ...
... 2003b; Richer & McCall 1995), samples were defined based on two criteria: 1. Detection of the [O iii] k4363 emission line for the determination of oxygen abundances. 2. A reliable distance (i.e., determined from stellar constituents, such as Cepheids and the tip of the RGB [TRGB]). ...
A COMPREHENSIVE COMPARISON OF THE SUN TO
... identify 11 maximally independent properties that have plausible correlations with habitability and that have been observed by, or can be derived from, sufficiently large, currently available, and representative stellar surveys. By comparing solar values for the 11 properties to the resultant stella ...
... identify 11 maximally independent properties that have plausible correlations with habitability and that have been observed by, or can be derived from, sufficiently large, currently available, and representative stellar surveys. By comparing solar values for the 11 properties to the resultant stella ...
Note - HKU Physics
... within a space of radius of the order of 100 light years. Thus, we can safely assume that stars in a single star cluster are formed from roughly the same material at about the same time under roughly the same physical conditions. Thus, mass of a star is perhaps the most important parameter to determ ...
... within a space of radius of the order of 100 light years. Thus, we can safely assume that stars in a single star cluster are formed from roughly the same material at about the same time under roughly the same physical conditions. Thus, mass of a star is perhaps the most important parameter to determ ...
The first carbon-enhanced metal-poor star found in the Sculptor
... The origin of carbon-enhanced metal-poor (CEMP) stars and their possible connection with the chemical elements produced by the first stellar generation is still highly debated. In contrast to the Galactic halo, not many CEMP stars have been found in the dwarf spheroidal galaxies around the Milky Way ...
... The origin of carbon-enhanced metal-poor (CEMP) stars and their possible connection with the chemical elements produced by the first stellar generation is still highly debated. In contrast to the Galactic halo, not many CEMP stars have been found in the dwarf spheroidal galaxies around the Milky Way ...
AUGUSTE COMTE`S BLUNDER: AN ACCOUNT OF THE FIRST
... presence of Co, Ba, Cu and Zn (Kirchhoff, 1861; 1863). Less than three decades after Comte made his assertion, it was already shown to be incorrect, at least for the Sun. But the results for the solar spectrum were no more than qualitative and there was no theoretical understanding of how the absorp ...
... presence of Co, Ba, Cu and Zn (Kirchhoff, 1861; 1863). Less than three decades after Comte made his assertion, it was already shown to be incorrect, at least for the Sun. But the results for the solar spectrum were no more than qualitative and there was no theoretical understanding of how the absorp ...
Stardust--Snapshots of Stars
... A group of researchers from Washington University in St. Louis, Missouri and the Carnegie Institution of Washington collaborated with CAMECA to develop and implement an exciting new automated analysis technique on the NanoSIMS that expands on automated methods developed in the early 2000s to study p ...
... A group of researchers from Washington University in St. Louis, Missouri and the Carnegie Institution of Washington collaborated with CAMECA to develop and implement an exciting new automated analysis technique on the NanoSIMS that expands on automated methods developed in the early 2000s to study p ...
hwd_ewd_v3 - X-ray and Observational Astronomy Group
... The basis for understanding the nature of most stars is analysis of their optical spectra and classification according to the characteristics revealed. A number of physical processes can alter the atmospheric composition of a white dwarf as it cools. As noted by Schatzman4, the strong gravitational ...
... The basis for understanding the nature of most stars is analysis of their optical spectra and classification according to the characteristics revealed. A number of physical processes can alter the atmospheric composition of a white dwarf as it cools. As noted by Schatzman4, the strong gravitational ...
Colour-magnitude diagrams of the post
... can be considered a member. Goranskii determined a period of 0.5752 days, so that the cluster can be tentatively classified as Oosterhoff type I. 5. Conclusions Cluster parameters based on CCD photometry were derived for NGC 6256 and NGC 6717. They are both located in the bulge, but are not metal-ri ...
... can be considered a member. Goranskii determined a period of 0.5752 days, so that the cluster can be tentatively classified as Oosterhoff type I. 5. Conclusions Cluster parameters based on CCD photometry were derived for NGC 6256 and NGC 6717. They are both located in the bulge, but are not metal-ri ...
Zapartas_deMink_Izzard_AA_2017
... Most massive stars, the progenitors of core-collapse supernovae, are in close binary systems and may interact with their companion through mass transfer or merging. We undertake a population synthesis study to compute the delay-time distribution of core-collapse supernovae, that is, the supernova ra ...
... Most massive stars, the progenitors of core-collapse supernovae, are in close binary systems and may interact with their companion through mass transfer or merging. We undertake a population synthesis study to compute the delay-time distribution of core-collapse supernovae, that is, the supernova ra ...
The Classification of Stellar Spectra
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
... Background: The History And Nature Of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph von Fraunhofer early in the 1800’s, but it was not until late in the century that astronomers were able to routinely examine the sp ...
Magnetic fields in O-, B- and A-type stars on the main sequence
... time scales. For these stars with radiative envelopes, it is proven that the fields are remnants of an early phase of the star-life and one speaks of fossil fields (see Sect. 3.1.3). Over the past decade important progress has been achieved in the area of stellar magnetism. It is mainly due to the dev ...
... time scales. For these stars with radiative envelopes, it is proven that the fields are remnants of an early phase of the star-life and one speaks of fossil fields (see Sect. 3.1.3). Over the past decade important progress has been achieved in the area of stellar magnetism. It is mainly due to the dev ...
X-Ray Properties of Young Stars and Stellar Clusters
... events. X-ray flares with luminosities orders of magnitude more powerful than seen in the contemporary Sun are frequently seen in young stars. Evidence for an impulsive phase is seen in radio bursts and in U-band enhancements preceding X-ray flares, thought to be due to the bombard- ...
... events. X-ray flares with luminosities orders of magnitude more powerful than seen in the contemporary Sun are frequently seen in young stars. Evidence for an impulsive phase is seen in radio bursts and in U-band enhancements preceding X-ray flares, thought to be due to the bombard- ...
CHAPTER 1 The Formation and Structure of Stars
... • How do astronomers know there is an interstellar medium, and how do they know its properties? – In some cases, the interstellar medium is easily visible as clouds of gas and dust—as in the case of the Great Nebula in Orion. – Astronomers call such a cloud a nebula—from the Latin word for cloud. – ...
... • How do astronomers know there is an interstellar medium, and how do they know its properties? – In some cases, the interstellar medium is easily visible as clouds of gas and dust—as in the case of the Great Nebula in Orion. – Astronomers call such a cloud a nebula—from the Latin word for cloud. – ...
Survey of Astrophysics A110 The Milky Way Galaxy
... Galaxy and contains old stars (Population II), globular clusters (also Population II), and some interstellar gas. The amount of gas in the large halo is small compared to the amount of gas in the thin disk. There is probably also an outer halo, composed of non-luminous matter, with a diameter of 200 ...
... Galaxy and contains old stars (Population II), globular clusters (also Population II), and some interstellar gas. The amount of gas in the large halo is small compared to the amount of gas in the thin disk. There is probably also an outer halo, composed of non-luminous matter, with a diameter of 200 ...
A STEP - Observatoire de la Côte d`Azur
... know of more than ~200 planets or planetary systems orbiting solar type stars in our neighbourhood. The discovery of more planets, smaller planets and the ability to characterize them directly impacts our ability to understand how planets form, how the Solar System formed, and to better prepare futu ...
... know of more than ~200 planets or planetary systems orbiting solar type stars in our neighbourhood. The discovery of more planets, smaller planets and the ability to characterize them directly impacts our ability to understand how planets form, how the Solar System formed, and to better prepare futu ...
offprint
... For further modeling to obtain the closest agreement between model and observations, a wide grid across plausible combinations of stellar parameters and pulsation amplitudes was computed, like for µ Cen (Rivinius et al. 2001b, their Table 3). For ω CMa this grid covered three polar effective temperat ...
... For further modeling to obtain the closest agreement between model and observations, a wide grid across plausible combinations of stellar parameters and pulsation amplitudes was computed, like for µ Cen (Rivinius et al. 2001b, their Table 3). For ω CMa this grid covered three polar effective temperat ...
Module1: Scale of the Universe
... Ask&your&students&to&discuss&some&possible&difBiculties&of&measuring&cosmic& distances&using¶llax.&Ensure&they&mention&the&following&points:& Parallax&shifts&are&always&small.&& Parallax&shift&is&even&smaller&than&the&apparent&size&of&the&star.&In&additional,& starlight&is&refracted&by&Earth's&a ...
... Ask&your&students&to&discuss&some&possible&difBiculties&of&measuring&cosmic& distances&using¶llax.&Ensure&they&mention&the&following&points:& Parallax&shifts&are&always&small.&& Parallax&shift&is&even&smaller&than&the&apparent&size&of&the&star.&In&additional,& starlight&is&refracted&by&Earth's&a ...
Chapter 5 Theory of Stellar Evolution
... concentrate on what is known with some certainty. Thus, we assume that stars can contract out of the interstellar medium, and generally we avoid most of the detailed description of the final, fatal collapse of massive stars. In addition, the fascinating field of the evolution of close binary stars, ...
... concentrate on what is known with some certainty. Thus, we assume that stars can contract out of the interstellar medium, and generally we avoid most of the detailed description of the final, fatal collapse of massive stars. In addition, the fascinating field of the evolution of close binary stars, ...
NSDL_WS_1_Astonomy
... http://www.compadre.org/Astronomy Hubble Space Telescope http://hubblesite.org International Year of Astronomy 2009 http://astronomy2009.us http://astronomy2009.org ...
... http://www.compadre.org/Astronomy Hubble Space Telescope http://hubblesite.org International Year of Astronomy 2009 http://astronomy2009.us http://astronomy2009.org ...
Impact of atmospheric refraction: How deeply can we probe exo
... papers (Garcı́a Muñoz & Mills 2012; Garcı́a Muñoz et al. 2012; Bétrémieux & Kaltenegger 2013; Rodler & López-Morales 2014; Misra et al. 2014). At the top of the atmosphere, the ray from the star is undeflected. As the impact parameter of the rays decreases, the deflection of the rays increases. ...
... papers (Garcı́a Muñoz & Mills 2012; Garcı́a Muñoz et al. 2012; Bétrémieux & Kaltenegger 2013; Rodler & López-Morales 2014; Misra et al. 2014). At the top of the atmosphere, the ray from the star is undeflected. As the impact parameter of the rays decreases, the deflection of the rays increases. ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.