A Spectroscopic Survey of Field Red Horizontal-branch Stars [PDF]
The Astronomical Journal, 2018 Abstract A metallicity, chemical composition, and kinematic survey has been conducted for a sample of 340 candidate field red horizontal-branch (RHB) stars. Spectra with high resolution and high signal-to-noise ratio were gathered with the McDonald Observatory 2.7 m Tull and the Hobby–Eberly Telescope echelle spectrographs, and were used
Melike Afşar +5 more
openaire +6 more sources
Identification of Blue Horizontal-branch Stars from LAMOST DR5 [PDF]
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
semanticscholar +1 more source
A Census of Above-horizontal-branch Stars in Galactic Globular Clusters [PDF]
Astrophysical Journal, 2021 We have carried out a search for above-horizontal-branch (AHB) stars—objects lying above the horizontal branch (HB) and blueward of the asymptotic giant branch (AGB) in the color–magnitude diagram—in 97 Galactic and seven Magellanic Cloud globular ...
B. D. Davis +3 more
semanticscholar +1 more source
Clean catalogues of blue horizontal-branch stars using Gaia EDR3 [PDF]
Astronomy & Astrophysics, 2021 Context. Blue horizontal-branch stars evolve from low-mass stars that have completed their main-sequence lifetimes and undergone a helium flash at the end of their red-giant phase.
R. Culpan, I. Pelisoli, S. Geier
semanticscholar +1 more source
Peculiarities in the Horizontal Branch Stars of Globular Cluster NGC 1851: Discovery of a Blue Straggler Companion to an EHB Star [PDF]
Astrophysical Journal, 2020 We present a study of far-UV (FUV) bright horizontal branch (HB) stars to understand the peculiarities seen in the HB sequence of the globular cluster NGC 1851, using ground- and space-based multiwavelength data.
Gaurav Singh +3 more
semanticscholar +1 more source
The Axial Rotation and Variable Macroturbulence of RR Lyrae and Red Horizontal Branch Stars [PDF]
Astronomical Journal, 2019 We have derived relations between FWHMs and equivalent widths of metallic absorption lines in the spectra of RR Lyrae stars to estimate new upper limits on the axial equatorial rotational velocities of RR Lyrae and metal-poor red horizontal branch (RHB ...
G. Preston +4 more
semanticscholar +1 more source
A-type stars in the Canada–France Imaging Survey I. The stellar halo of the Milky Way traced to large radius by blue horizontal branch stars [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We present the stellar density profile of the outer halo of the Galaxy traced over a range of Galactocentric radii from $15< R_{GC} < 220$ kpc by blue horizontal branch (BHB) stars.
G. Thomas +16 more
semanticscholar +1 more source
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
Chemical Compositions of Evolved Stars from Near-infrared IGRINS High-resolution Spectra. I. Abundances in Three Red Horizontal Branch Stars [PDF]
Astrophysical Journal, 2018 We have derived elemental abundances of three field red horizontal branch stars using high-resolution (R ≃ 45,000), high signal-to-noise ratio (S/N ≳ 200) H- and K-band spectra obtained with the Immersion Grating Infrared Spectrograph (IGRINS).
M. Afşar +8 more
semanticscholar +1 more source
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