horizontal branch stars

The evolution of horizontal

A new grid of standard ie solar CNO/Fe no core rotation and including semiconvection horizontal-branch evolutionary sequences are presented which extend the grid of Sweigart both by including the final phase of core helium exhaustion and by using a finer grid of compositions...

Horizontal branch stars the interplay between

stars according to Momany et al 2004 is also schemati-cally indicated In the next section we briefly discuss each of these com-ponents in turn 2 The different constituents of the horizontal branch 21 The red clump Red clumps originate from red giants that undergo the he-lium flash at the tip of the RGB while still having a total...

Horizontal

Horizontal-branch stars play an important role in defining the absolute distance scale in the universe For that one has to know Mv at relevant B-V with well defined M/H for each type of horizontal-branch star...

G C Sloan Main Sequence Stars Giants and Supergiants

In this bizarre geometry even though the interior temperature is far hotter than n the main sequence the outer layers expand and cool producing a red giant Horizontal branch stars The horizontal branch is also called the helium-burning main sequence Eventually the temperature of the stellar core gets so high helium fusion can occur...

Blue Horizontal

Distant field blue horizontal branch stars and the mass of the Galaxy - II Photometry and spectroscopy of UKST candidates 16 B 195 11 R 52 kpc John E Norris et al 2004 Monthly Notices of the Royal Astronomical Society 352 285 Crossref Blue Horizontal-Branch Stars in...

astrophysics

I m trying to determine what the lifetime of a star on the horizontal branch of the Hertzsprung-Russell diagram would be Some websites say 10 8 while others said 10 7 so I don t know which one is correct or incorrect...

IUE observations of globular clusters and blue horizontal

In order to provide basic information on the nature of the horizontal branch star whose light dominates in the ultraviolet observations of field horizontal branch stars as well as individual stars in globular clusters are discussed...

horizontal branch stars

In the evolutionary phase of central helium burning models of horizontal-branch stars reach a stage at which an intermediate region is unstable against convection This feature is due to the progressive increase of the core mass by overshooting during the previous evolutionary stages and to the behaviour of the radiative temperature gradient at the core boundary...

Astronomy 128 Cluster Color Magnitude Diagrams

Star cluster ages range from a few million years several times 10 6 to a few billion several times 10 9 To find the magnitude at the tip of the giant branch and the magnitude of the horizontal branch just read from the diagram Estimate to the nearest 01 magnitude...

The Final Stages of the Evolution of a Sun

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...

horizontal branch star

Translation for horizontal branch star in the free English-German dictionary and many other German translations...

THE ABUNDANCES OF NEUTRON

The globular cluster M15 is unique in its display of star-to-star variations in the neutron-capture elements Comprehensive abundance surveys have been previously conducted for handfuls of M15 red giant branch RGB and red horizontal branch RHB stars No attempt has been made to perform a single self-consistent analysis...

07082445 Horizontal Branch Stars and the Ultraviolet

Abstract Extremely hot horizontal branch HB stars and their progeny are widely considered to be responsible for the ultraviolet upturn or UVX phenomenon observed in elliptical galaxies and the bulges of spirals Yet the precise evolutionary channels that lead to the production of these stars remain the source of much debate...

Stellar Evolution Red Giants

Asymptotic Giant Branch Stars After existing as horizontal branch stars for a few million years the helium in the core of the star is exhausted now being mostly carbon and oxygen nuclei and a helium burning shell will develop underneath the hydrogen burning shell...

extreme horizontal branch star EHB star

An extreme horizontal branch star EHB star also known as an extended horizontal branch star is the hottest variety of star on the horizontal branch of the Hertzsprung-Russell diagram with a temperature of about 25 000 K 45 500 176 F...

Lifetime of a horizontal branch star

Lifetime of a horizontal branch star Ask Question up vote 6 down vote favorite I m trying to determine what the lifetime of a star on the horizontal branch of the Hertzsprung-Russell diagram would be Some websites say 10 8 while others said 10 7 so I don t know which one is correct or incorrect...

Blue Horizontal Branch Stars in Old

Twenty years ago Burstein et al 1984 suggested that strong CN and Hbeta absorption meant younger ages among globular clusters in the Andromeda galaxy M31 unless blue stars above the main-sequence turnoff or on the horizontal branch were uncommonly prominent...

A new spin on horizontal

Abstract High-resolution spectroscopy of blue horizontal-branch stars in metal-poor globular clusters reveals remarkable differences in photospheric composition and rotation rate between cooler and hotter stars...

Rotation of Horizontal

Prompted by new observations of rotation rates of horizontal-branch stars we calculate simple models for the angular momentum evolution of a globular cluster giant star from the base of the giant branch to the star s appearance on the horizontal branch...

THE CENTURY SURVEY GALACTIC HALO PROJECT III A

We present a complete spectroscopic survey of 2414 2MASS-selected blue horizontal branch BHB candidates selected over 4300 deg2 of the sky We identify 655 BHB stars in this non-kinematically selected sample We calculate the luminosity function of field BHB stars and find evidence for very few hot BHB stars in the field...

Lecture 16 The Evolution of Low

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 While it goes on the star steadily builds up a C-O core but it is still too cool to ignite Carbon fusion...

horizontal

the horizontal-branch HB stars are post-main sequence stars that burn helium in their core and hydrogen in a shell eg Moehler 2004 In this paper we consider the HB stars...

PRIMORDIAL HELIUM AND THE LUMINOSITY OF

the horizontal-branch stars are summarized in Tables 1 and 2 respectively For the determination of the absolute visual magnitude a bolometric correction of -0 6 was adopted...

Striking Photospheric Abundance Anomalies in Blue

High-resolution optical spectra of 13 blue horizontal-branch stars in the globular cluster M13 show enormous deviations in element abundances from the expected cluster metallicity...

Horizontal branch stars as a probe of non baryonic dark

The evolution of horizontal-branch HB stars including the effect of energy transfer by dark matter particles WIMPs or cosmions is investigated numerically If HB stars contain enough cosmions to break core convection thermal pulses ensue on the core Kelvin-Helmholtz time scale until the central helium abundance is exhausted...

The Origin of Extreme Horizontal Branch Stars

Abstract Strong mass loss on the red giant branch RGB can result in the formation of extreme horizontal branch EHB stars The EHB stars spend most of their He core and shell-burning phase at high temperatures and produce copious ultraviolet flux...

Quiz 2 Answers

Stars that are fusing hydrogen into helium in their cores are located on which part of the H-R diagram horizontal branch Stars that are fusing helium into carbon in their cores are located on which part of the H-R diagram horizontal branch The asymptotic giant branch is where you find stars that are fusing He into C not as the core but in...

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...

The field horizontal

The item The field horizontal-branch star HD 109995 new results with coadded ultraviolet and optical region spectra Saul J Adelman and David S Leckrone represents a specific individual material embodiment of a distinct intellectual or artistic creation found in Indiana State Library...

Astronomy Test 3 Flashcards Quizlet

Which of the following statements about these horizontal branch stars is true a They have inert nonburning carbon cor b Their sole source of energy is hydrogen shell burning c In a particular star cluster all horizontal branch stars have the same spectral type d They generate energy through both hydrogen fusion and helium fusion...

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