horizontal branch consequences

horizontal branch consequences

The Horizontal Branch morphology in Globular Clusters ...

The Horizontal Branch morphology in Globular Clusters: consequences for the selfpollution model D'Antona, Francesca; Abstract. The Joint Discussion 4 of the Sydney IAU General Assembly takes place at a very interesting stage for the Globular Cluster (GC) astrophysics, when it is becoming clear that many -if not all- of the inhomogeneities in ...

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(PDF) The Horizontal Branch morphology in Globular ...

The Horizontal Branch morphology in Globular Clusters: consequences for the selfpollution model

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The Horizontal Branch as a probe of stellar population history

sequence observed in ! Centauri, I investigated the consequences of this hypothesis elsewhere on the color-magnitude diagram. I concentrated on the horizontal branch where the efiects of high helium are expected to show themselves most clearly. In the process, I developed a new procedure for comparing the mass loss sufiered by

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Astronomy 1144: Lecture 15

Horizontal Branch star Asymptotic Giant Branch star Planetary Nebula phase White Dwarf star Key Equations. Main Sequence Phase ... Consequences: Small changes in T lead to Large changes in fusion energy output Star experiences huge Thermal Pulses that destabilize the outer envelope.

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Horizontal branch - Wikipedia

The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion (via the CNO cycle) in a shell surrounding the core. The onset of core helium fusion at the tip of the red-giant branch causes substantial changes in stellar structure, resulting in an overall reduction in luminosity, some contraction of the stellar envelope, and th

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Horizontal branch A- and B-type stars in globular clusters ...

In 1999, two groups independently suggested that diffusion effects might cause these deviations, which we verified subsequently. I will discuss these observations and analyses and their consequences for interpreting observations of hot horizontal branch stars.

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The Final Stages of the Evolution of a Sun-like Star

The horizontal branch phase of a star's life is much shorter than the Main Sequence phase of its lifetime. The star will convert all of its core helium into carbon and oxygen, and then fusion will end once again. The core will again begin to collapse inward with no radiation pressure to support it.

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(PDF) Mass Loss Predictions for Hot Horizontal Branch Stars

We predict mass-loss rates for the late evolutionary phases of low-mass stars, with special emphasis on the consequences for the morphology of the Horizontal Branch (HB).

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Horizontal branch A- and B-type stars in globular clusters ...

Dec 01, 2004  Globular clusters offer ideal laboratories to test the predictions of stellar evolution. When doing so with spectroscopic analyses during the 1990s, however, the parameters we derived for hot horizontal branch stars deviated systematically from theoretical predictions. The parameters of cooler, A-type horizontal branch stars, on the other hand, were consistent with evolutionary theories.

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Astronomy 1144: Lecture 15

Horizontal Branch star Asymptotic Giant Branch star Planetary Nebula phase White Dwarf star Key Equations. Main Sequence Phase ... Consequences: Small changes in T lead to Large changes in fusion energy output Star experiences huge Thermal Pulses that destabilize the outer envelope.

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The Horizontal Branch

The Horizontal Branch. Evolution on the horizontal branch (HB) is similar to main sequence evolution since it is a period of stable core burning (but of helium, rather than hydrogen). For this reason, it is sometimes called the "helium main sequence". However, the time of stable helium core burning is much shorter than the time of stable ...

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[astro-ph/0209331] Helium variation due to self-pollution ...

Sep 17, 2002  Title: Helium variation due to self-pollution among Globular Cluster stars: consequences on the horizontal branch morphology. ... However, the difference in the evolving mass may play a role in the morphology of the horizontal branch, and in particular in the formation of blue tails, in those globular clusters which show strong CNO abundance ...

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Horizontal Branch SpringerLink

The horizontal-branch (HB) is the region of the Hertzsprung–Russell diagram occupied by evolved stars – after the red giant stage – of low mass and low metallicity (abundance of elements heavier than He less than 0.1 that of the Sun), during their central He-burning (He-fusion) phase. The HB is observed in globular clusters, whereas in open clusters (having approximately solar ...

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The Final Stages of the Evolution of a Sun-like Star

The horizontal branch phase of a star's life is much shorter than the Main Sequence phase of its lifetime. The star will convert all of its core helium into carbon and oxygen, and then fusion will end once again. The core will again begin to collapse inward with no radiation pressure to support it.

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STARS - S07

Horizontal Branch – Helium Main Sequence Helium is gone: Carbon-Oxygen core contracts and heats Asymptotic Giant Branch (AGB) star – inert CO core, Helium and Hydrogen Shell Burning AGB are unstable. Violent pulsations eventually eject the whole atmosphere Planetary Nebula The exposed degenerate core is seen as a white dwarf

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Lecture 16: Low-Mass Stellar Evolution

Horizontal Branch Phase Structure: He-burning core H-burning shell The Triple-alpha Process is very inefficient at producing energy, so it can only last for about 100 Myr. ... Consequences: Small changes in T lead to Large changes in fusion energy output Star experiences huge Thermal Pulses that destabilize the outer envelope.

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Pros Cons of Wet Venting Bathrooms

Each individual fixture drain or trap arm shall connect horizontally to the wet-vented horizontal branch drain or shall be provided with a dry vent. The trap to vent distance shall be in accordance with Table 10-I. Only the fixtures within the bathroom groups shall connect to the wet-vented horizontal branch drain.

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The kinematic consequences of locomotion on sloped ...

In the leading hindlimb, the BOS was 20±6 mm on the horizontal branch, 16±8 mm on the shallow incline and 18±8 mm at 60 deg incline. Interestingly, at 30 deg inclination we found an intermediate ‘position’ in the 3-D angular and element excursions of both forelimbs and hindlimbs of rats (Figs 4 –7).

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Horizontal branch stars Article about Horizontal branch ...

horizontal branch. [ ‚härə′zäntəl ′branch] (astronomy) A region in the Hertzsprung-Russell diagram of a typical globular cluster that extends in the blue direction from the giant branch at an absolute bolometric magnitude of 0.3 and consists of stars that are burning helium in their cores and hydrogen in their surrounding envelopes.

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2005HiA....13R.156D Page 156 - Harvard University

SAO/NASA Astrophysics Data System (ADS) Title: The horizontal branch morphology in globular clusters: consequences for the self-pollution model Authors: D'Antona, F. Journal: In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July 2003]. Edited by O. Engvold. San Francisco, CA: Astronomical Society of the Pacific,

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Horizontal Branch A- and B-type Stars in Globular ... - CORE

The parameters of cooler, A-type horizontal branch stars, on the other hand, were consistent with evolutionary theories. In 1999, two groups independently suggested that diffusion effects might cause these deviations, which we verified subsequently.

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Internal Rotation of Subdwarf B Stars: Limiting Cases and ...

Download Citation Internal Rotation of Subdwarf B Stars: Limiting Cases and Asteroseismological Consequences Observations of the rotation rates of horizontal branch (HB) stars show puzzling ...

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The Horizontal Branch morphology in Globular Clusters ...

The Horizontal Branch morphology in Globular Clusters: consequences for the selfpollution model Francesca D’Antona INAF Osservatorio di Roma, via di Frascati 33, 00040 Monteporzio e-mail: [email protected] Abstract. The Joint Discussion 4 of the

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Astronomy 1144: Lecture 15

Horizontal Branch star Asymptotic Giant Branch star Planetary Nebula phase White Dwarf star Key Equations. Main Sequence Phase ... Consequences: Small changes in T lead to Large changes in fusion energy output Star experiences huge Thermal Pulses that destabilize the outer envelope.

More

[astro-ph/0209331] Helium variation due to self-pollution ...

Sep 17, 2002  Title: Helium variation due to self-pollution among Globular Cluster stars: consequences on the horizontal branch morphology. ... However, the difference in the evolving mass may play a role in the morphology of the horizontal branch, and in particular in the formation of blue tails, in those globular clusters which show strong CNO abundance ...

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In what stage is a star when it is in the horizontal branch?

The horizontal-branch (HB) is the region of the Hertzsprung–Russell diagram occupied by evolved stars – after the red giant stage – of low mass and low metallicity (abundance of elements heavier than He less than 0.1 that of the Sun), during their central He-burning (He-fusion) phase.

More

The Final Stages of the Evolution of a Sun-like Star

The horizontal branch phase of a star's life is much shorter than the Main Sequence phase of its lifetime. The star will convert all of its core helium into carbon and oxygen, and then fusion will end once again. The core will again begin to collapse inward with no radiation pressure to support it.

More

Winds, rotation, and the low gravity problem

on the consequences for the morphology of the Horizontal Branch (HB). We show that the computed rates, as predicted by the most plausible mechanism of radiation pressure on spectral lines, are too ...

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Lecture 16: Low-Mass Stellar Evolution - Ohio State University

Horizontal Branch Phase Structure: He-burning core H-burning shell The Triple-alpha Process is very inefficient at producing energy, so it can only last for about 100 Myr. ... Consequences: Small changes in T lead to Large changes in fusion energy output Star experiences huge Thermal Pulses that destabilize the outer envelope.

More

Horizontal Wet Venting - King County

911.3 Slope and Size of Horizontal Branch. The slope of the vent section of the horizontal branch drain shall be not more than 1 inch per foot (83.3 mm/m). The entire length of the vented section of the horizontal branch drain shall be sized for the total drainage discharge to the branch.

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Horizontal Gene Transfer - an overview ScienceDirect Topics

Horizontal gene transfer (HGT), or lateral gene transfer (LGT), is the nonvertical transfer of genetic material between different species (Savory, Leonard, Richards, 2015). HGT can have significant evolutionary consequences, such as facilitating recipient species to adapt to different ecosystems or exploit new hosts.

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Horizontal branch - Infogalactic: the planetary knowledge core

The horizontal branch ends in a "blue tail" with hotter stars having lower luminosity, occasionally with a "blue hook" of extremely hot stars. The hottest horizontal-branch stars, referred to as extreme horizontal branch, have temperatures of 20,000–30,000K. This is far beyond what would be expected for a normal core helium burning star.

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Horizontal Branch A- and B-type Stars in Globular Clusters

Log T (eff) and log g have been determined for blue horizontal branch (HB) stars in the globular clusters M15, M3, M5, M92, and NGC 288 as a first step in determining the physical origin of gaps ...

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Observational Consequences of the Hypothesized Helium-rich ...

Its bluest main sequence and extended horizontal branch stars are suggested to have the common origin, that is, an extremely high helium abundance of Y ~ 0.4. ... Consequences on the horizontal ...

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[1212.3063] Effects of tidally enhanced stellar wind on ...

Dec 13, 2012  We investigate evolutionary consequences of red giants in binaries by including tidally enhanced stellar winds, and examine the effects on the HB morphology of GCs. We find that red, blue, and extreme horizontal branch stars are all produced under the effects of tidally enhanced stellar wind without any additional assumptions on the mass-loss ...

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Winds, rotation, and the low gravity problem

on the consequences for the morphology of the Horizontal Branch (HB). We show that the computed rates, as predicted by the most plausible mechanism of radiation pressure on spectral lines, are too ...

More

Horizontal Branch SpringerLink

The horizontal-branch (HB) is the region of the Hertzsprung–Russell diagram occupied by evolved stars – after the red giant stage – of low mass and low metallicity (abundance of elements heavier than He less than 0.1 that of the Sun), during their central He-burning (He-fusion) phase. The HB is observed in globular clusters, whereas in open clusters (having approximately solar ...

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Red Giant, Horizontal Asymptotic Giant Branch Stars ...

Therefore, the horizontal branch star will expand and cool once again into a particular kind of giant star, an asymptotic giant branch (AGB) star, a star of low to intermediate mass that has an ...

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On constructing horizontal branch models

Comparisons of the theoretical horizontal-branch sequences, for a range in envelope helium abundance and O/Fe, to data available for M15, showed that the calculations can reproduce (at least in ...

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Horizontal Gene Transfer - an overview ScienceDirect Topics

Horizontal gene transfer (HGT), or lateral gene transfer (LGT), is the nonvertical transfer of genetic material between different species (Savory, Leonard, Richards, 2015). HGT can have significant evolutionary consequences, such as facilitating recipient species to adapt to different ecosystems or exploit new hosts.

More

Blue Horizontal Branch Stars in Four Globular Clusters ...

Cacciari, C., Fusi Pecci, F., Bragaglia, A. and Buzzoni, A.: 1995, IUE observations of blue horizontal branch stars in the globular clusters M 3 and NGC 6752, Astron ...

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Why Helium-burning Stars are found in a Horizontal Branch ...

Apr 02, 2018  2. This is explained in the Wikipedia article. Stars on the horizontal branch all have very similar core masses, following the helium flash. This means that they have very similar luminosities, and on a Hertzsprung–Russell diagram plotted by visual magnitude the branch is horizontal

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Extreme Horizontal Branch Stars - ResearchGate

Hot horizontal branch stars in metal-rich globular clusters are found to form a small, but rather inhomogeneous group that cannot be explained by one evolutionary scenario.

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Horizontal to Horizontal Connection With Wye Terry Love ...

Apr 03, 2021  I know you can use a wye and wye combo coming into horizontal to horizontal on drain and either come in straight or roll it up. My situation is I have a main running horizontal and my branch drain coming in horizontal is offset at a higher level to where i need to roll my wye on my main putting it at 90 degrees on its back and come across with my branch horizontally and drop into the top of my ...

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[astro-ph/0209331] Helium variation due to self-pollution ...

Sep 17, 2002  Title: Helium variation due to self-pollution among Globular Cluster stars: consequences on the horizontal branch morphology. ... However, the difference in the evolving mass may play a role in the morphology of the horizontal branch, and in particular in the formation of blue tails, in those globular clusters which show strong CNO abundance ...

More

Effects of tidally enhanced stellar wind on the horizontal ...

Dec 13, 2012  We investigate evolutionary consequences of red giants in binaries by including tidally enhanced stellar winds, and examine the effects on the HB morphology of GCs. ... the horizontal branch ...

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2004MmSAI..75..377D Page 377

Title: The Horizontal Branch morphology in Globular Clusters: consequences for the selfpollution model Authors: D'Antona, F. Journal: Memorie della Società Astronomica Italiana, v.75, p.377 (2004) Bibliographic Code: 2004MmSAI..75..377D

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[PDF] Core collapse and horizontal-branch morphology in ...

Context. Stellar collision rates in globular clusters (GCs) do not appear to correlate with horizontal branch (HB) morphology, sug- gesting that dynamics does not play a role in the second-parameter problem. However, core densities and collision rates derived from surface-brightness may be significantly underestimated as the surface-brightness profile of GCs is not necessarily a good indicator ...

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