Results 1 to 10 of about 472,116 (331)
Rotation of Horizontal Branch Stars in Globular Clusters [PDF]
The Astrophysical Journal, 1999 The rotation of horizontal branch stars places important constraints on angular momentum evolution in evolved stars and therefore rotational mixing on the giant branch.
Pinsonneault, M., Sills, A.
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The peculiar Horizontal Branch of NGC 2808 [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 We present an accurate analysis of the peculiar Horizontal Branch (HB) of the massive Galactic globular cluster NGC 2808, based on high-resolution far-UV and optical images of the central region of the cluster obtained with HST. We confirm the multimodal
B. Lanzoni +83 more
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Multimodal Distributions along the Horizontal Branch [PDF]
The Astrophysical Journal, 1998 We report on HST/WFPC2 U,V and far-ultraviolet observations of two Galactic Globular Clusters (GGCs), NGC 6205 = M13 and NGC 6093 = M80. Both of these clusters have horizontal-branch (HB) tails that extend to the helium-burning main sequence, with the hottest stars reaching theoretical effective temperatures above 35,000 K.
F. R. Ferraro +4 more
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Horizontal Branch evolution, metallicity and sdB stars [PDF]
Astronomy & Astrophysics, 2011 Context. Abundance anomalies have been observed in field sdB stars and in nearly all Horizontal Branch (HB) stars of globular clusters with Teff > 11 000K whatever be the cluster metallicity. Aims.
Behr +55 more
core +6 more sources
Precision CCD Photometry of the Horizontal Branch [PDF]
Symposium - International Astronomical Union, 1995 The Strömgren four-color system is well suited to the measure and analysis of horizontal-branch stars. The increased accuracy of the CCD photometric system and the ability to measure fainter stars in very crowded regions make the combination of the CCD system and four-color photometry an excellent one to study horizontal-branch stars in globular ...
A. G. D. Philip
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Horizontal Branch Stellar Evolution
, 1995 I review aspects of the evolution of horizontal branch (HB) stars. I start by discussing current topics in the study of HB stellar evolution, including a brief review of the main determinants of the structure of low-mass core helium burning stars and of HB morphology.
Ben Dorman
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Mass Loss on the Horizontal Branch: An Application to NGC 6791 [PDF]
The Astrophysical Journal, 2000 The presence of a substantial number of hot stars in the extremely metal-rich} open cluster NGC6791 has been a mystery. If these hot stars are in their core helium burning phase, they are significantly bluer (hotter) than predicted by canonical stellar evolution theory. No obvious explanation is available yet.
H. Yong, P. Demarque, Sukyoung K. Yi
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Rotation, planets, and the 'second parameter' of the horizontal branch [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 We analyze the angular momentum evolution from the red giant branch (RGB) to the horizontal branch (HB) and along the HB. Using rotation velocities for stars in the globular cluster M13, we find that the required angular momentum for the fast rotators is up to 1-3 orders of magnitude (depending on some assumptions) larger than that of the sun.
Noam Soker, Amos Harpaz
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Meikuang Anquan, 2021 This paper takes the multi-branch horizontal grouting well reinforced with limestone on the corresponding floor L8 in the 15011 coal seam working face of Zhaogu No.1 Mine as the research object.
LIU Xiugang +3 more
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Identification of Blue Horizontal-branch Stars from LAMOST DR5
The Astrophysical Journal Supplement Series, 2023 We construct a new catalog of the blue horizontal-branch (BHB) stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR5 data set, which contains 5355 + 81 BHB stars at high Galactic latitude (∣Glat∣ > 20°).
Jie Ju +8 more
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