Results 21 to 30 of about 1,859,132 (364)
The HST/ACS star formation history of the Tucana dwarf spheroidal galaxy: clues from the horizontal branch [PDF]
Astronomy & Astrophysics, 2019 We report a new star formation history for the Tucana dwarf spheroidal galaxy, obtained from a new look at a deep HST/ACS colour-magnitude diagram. We combined information from the main sequence turn-off and the horizontal branch to resolve the ancient ...
A. Savino +4 more
semanticscholar +1 more source
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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Pulsational instabilities driven by the ∈ mechanism in hot pre-horizontal branch stars [PDF]
Astronomy & Astrophysics, 2018 Context. The ∈ mechanism is a self-excitation mechanism of stellar pulsations that acts in regions inside the star where nuclear burning takes place.
T. Battich +3 more
semanticscholar +1 more source
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
openaire +2 more sources
Search for stellar spots in field blue horizontal-branch stars [PDF]
Astronomy & Astrophysics, 2018 Context. Blue horizontal-branch stars are Population II objects which are burning helium in their core and possess a hydrogen-burning shell and radiative envelope.
E. Paunzen +5 more
semanticscholar +1 more source
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
doaj +1 more source
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
openaire +2 more sources
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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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 distribution of stars along the HB: 4 sub-populations separated by gaps are distinguishable.
DALESSANDRO, EMANUELE +7 more
openaire +3 more sources
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
doaj +1 more source