horizontal branch stars

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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...

[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...

astrophysics - Lifetime of a horizontal branch star ,

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...

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 ....

extreme horizontal branch star (EHB star) - David Darling

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°F)...

Search For Vertical Stratification Of Metals In ,

Context The observed abundance peculiarities of many chemical species relative to the expected cluster metallicity in blue horizontal-branch (BHB) stars presumably appear as a ,...

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...

Rotation of Horizontal-Branch Stars in Globular Clusters

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...

horizontal-branch stars - researchgate

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...

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 ,...

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...

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 presence of intermediate-mass black holes in ,

called extreme horizontal branch stars, see Rich et al 1997 and, for a review on this subject in the context of dense galactic nuclei environment, also Alexander 2005, section 34) These are stars heavier and bluer than turn-off stars, which are located at the lower-left end of the horizontal branch ,...

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 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...

THE ABUNDANCES OF NEUTRON-CAPTURE SPECIES IN THE ,

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...

extreme horizontal branch star (EHB star) - David Darling

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°F)...

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...

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 Helium Flash and the Horizontal Branch - utoledoedu

The star then enters horizontal branch or red clump phase where there is Helium core burning The horizontal branch is best visible in lower metalicity population II objects The Effective temperature of the object depends on the amount of envelope remaining...

horizontal branch stars - definition - English - Glosbe

In helium-burning horizontal-branch stars, transformation of helium into carbon increases opacity in the convective core cordis 'The star is rotating relatively quickly for an horizontal branch star ,...

horizontal branch stars - definition - English - Glosbe

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...

Blue Horizontal Branch Stars in Old , - Internet Archive

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...

Horizontal Branch Stars, and Galactic Klaas S° de Boer

Horizontal Branch Stars, and Galactic and Magellanic Cloud Globular Clusters Klaas S° de Boer Washburn Observatory University of Wisconsin, Madison WI 53706 Seven blue horizontal branch stars in the field have been observed, and a few HB stars have been isolated in globular clusters Energy distributions are compared to assess...

Blue Horizontal-Branch Stars in the Sloan Digital Sky ,

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 ,...

Horizontal Branch Stars | Symposium - International ,

Horizontal Branch Stars - Volume 66 Please note, due to essential maintenance online purchasing will not be possible between 03:00 and 12:00 BST on Sunday 6th May We apologise for any inconvenience Skip to main content We use cookies to distinguish you from other users and to provide you with a better experience on our websit...

absolute magnitude of field metal-poor horizontal branch ,

The absolute magnitude of field metal-poor horizontal branch stars Raffaele G Gratton , The absolute magnitude of field metal-poor horizontal branch stars, , Hipparcos satellite parallaxes for 22 metal-poor field horizontal branch stars with V 0 <9 are used to derive their absolute magnitude...

Blue Horizontal-Branch Stars in the Sloan Digital Sky ,

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 ,...

The Helium Flash and the Horizontal Branch - utoledoedu

The star then enters horizontal branch or red clump phase where there is Helium core burning The horizontal branch is best visible in lower metalicity population II objects The Effective temperature of the object depends on the amount of envelope remaining...

Rotation of Horizontal-Branch Stars in Globular Clusters

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...

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