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Horizontal Branch Evolution [PDF]
International Astronomical Union Colloquium, 1989 AbstractIn 1973 the outstanding problems confronting the theory of horizontal branch evolution were the “second parameter” problem and the Oosterhoff Effect. Despite significant progress, particularly in the observations and in the observation/theory interface, they remain as the outstanding problems of 1988.
R.T. Rood, D.A. Crocker
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The horizontal-branch A stars [PDF]
Publications of the Astronomical Society of the Pacific, 1979 The observational determination of astrophysical parameters of horizontal-branch A stars is discussed. Effective temperatures, surface gravities, and bolometric magnitudes are determined for seven field horizontal-branch A stars, and their masses are calculated. The mean mass for these seven stars is 0.6 + or - 0.4 solar mass.
A. G. D. Philip, D. S. Hayes
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Geofluids, 2022 Multibranched horizontal well is an important means to develop low permeability reservoirs. Fishbone multibranched horizontal well has the advantages of increasing drainage area, reducing drilling number, utilizing existing wells, and saving oilfield ...
Shukai Tang +4 more
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Numerical Simulation Study Of Squeezed Branch Piles Based On Post-grouting Technology [PDF]
E3S Web of Conferences, 2021 The squeezed branch pile has strong resistance to pressure, pullout and horizontal force, and it also has excellent stability, which makes it widely used in the field of electrical engineering.
Ma LiXing +4 more
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On constructing horizontal branch models [PDF]
Astronomy & Astrophysics, 2005 We investigate different methods used to construct (zero-age) horizontal branch models and compare the resulting horizontal branch evolution with that of models resulting from the calculation of the complete stellar evolution from the main sequence and through the core helium flash.
Achim Weiss, Aldo Serenelli
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The Astronomical Journal, 2023 Wide-field and deep DECam multiband photometry, combined with HST data for the core of the Galactic globular cluster NGC 2808, allowed us to study the distribution of various stellar subpopulations and stars in different evolutionary phases out to the ...
Christian I. Johnson +9 more
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On the Bimodal Distributions of Horizontal Branches [PDF]
Symposium - International Astronomical Union, 1988 New synthetic horizontal branch (HB) models are presented for some globular clusters known to have bimodal HB distributions. These models are based on new Yale HB evolutionary tracks for Y=0.25 and the core masses appropriate for the compositions. The distribution of stellar masses along the HB is given by a slightly modified version of Rood's (1973 ...
Robert Zinn +2 more
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Bimodal Distributions on the Horizontal Branch [PDF]
Symposium - International Astronomical Union, 1988 We present preliminary versions of log g - log Teff diagrams for a number of clusters with gaps in their blue horizontal branches and for two normal clusters.
Deborah A. Crocker, Robert T. Rood
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The Hot End of Evolutionary Horizontal Branches [PDF]
The Astrophysical Journal, 1995 postscript file of 10 pages plus 1 tables,rep.1 5 figures will be added later as postscript file The tex file and the other two not postscript figures are available upon request at scilla@vaxfe.fe.infn.it, rep ...
CASTELLANI V +2 more
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The horizontal branch of the Sculptor dwarf galaxy [PDF]
Astronomy & Astrophysics, 2013 We have performed the first detailed simulation of the horizontal branch of the Sculptor dwarf spheroidal galaxy by means of synthetic modelling techniques,taking consistently into account the star formation history and metallicity evolution as determined from the main sequence and red giant branch spectroscopic observations. The only free parameter in
Maurizio Salaris +4 more
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