Results 1 to 10 of about 54,959 (273)

Inferring Coupling Strengths of Mixed-mode Oscillations in Red Giant Stars Using Deep Learning

open access: yesThe Astrophysical Journal, 2023
Asteroseismology is a powerful tool that may be applied to shed light on stellar interiors and stellar evolution. Mixed modes, behaving like acoustic waves in the envelope and buoyancy modes in the core, are remarkable because they allow for probing the ...
Siddharth Dhanpal   +5 more
doaj   +1 more source

A Red Giants’ Toy Story. II. Understanding the Red-giant Branch Bump

open access: yesThe Astrophysical Journal, 2023
The Red-Giant Branch Bump (RGBB) is one of the most noteworthy features in the red-giant luminosity function of stellar clusters. It is caused by the passage of the hydrogen-burning shell through the composition discontinuity left at the point of the ...
Marcelo M. Miller Bertolami
doaj   +1 more source

Asteroseismic Modeling of 1153 Kepler Red Giant Branch Stars: Improved Stellar Parameters with Gravity-mode Period Spacings and Luminosity Constraints

open access: yesThe Astrophysical Journal, 2023
This paper reports the estimated stellar parameters of 1153 Kepler red giant branch stars determined with asteroseismic modeling. We use radial-mode oscillation frequencies, gravity-mode period spacings, Gaia luminosities, and spectroscopic data to ...
Yingxiang Wang   +4 more
doaj   +1 more source

Astrophysical Distance Scale. VII. A Self-consistent, Multiwavelength Calibration of the Slopes and Relative Zero Points for the Run of Luminosity with the Color of Stars Defining the Tip of the Red Giant Branch

open access: yesThe Astronomical Journal, 2023
Given the recent successful launch of the James Webb Space Telescope, determining robust calibrations of the slopes and absolute magnitudes of the near- to mid-infrared tip of the red-giant branch (TRGB) will be essential to measuring precise ...
Barry F. Madore   +2 more
doaj   +1 more source

Dynamical Substructures of Galactic Globular Clusters II. NGC 6934 [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2004
The variations of the dynamical substructures of NGC 6934 have been investigated by means of performing point spread function stellar photometry and the surface photometry on BV CCD images of NGC 6934.
Jongwhan Rhee   +3 more
doaj   +1 more source

The Near-IR TRGB Magnitude and Distance Modulus to NGC 185 [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2008
We determined values of distance modulus to nearby dwarf galaxy NGC 185 from the Tip of Red-Giant Branch (TRGB) method. Apparent magnitudes of the TRGB are estimated from the near-infrared JHK luminosity functions (LFs) of the resolved giant branch stars.
Y.-J. Sohn   +7 more
doaj   +1 more source

A Wide View of the Galactic Globular Cluster NGC 2808: Red Giant and Horizontal Branch Star Spatial Distributions

open access: yesThe 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

Metallicities of Globular Clusters m3 and m5 from VI CCD Photometry [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2000
To derive the metallicities of M3 and M5, we used the shape of red giant branch, horizontal branch magnitude, and red giant branch bump on the (V - I) - V color magnitude diagrams.
Young-Jong Sohn, Hyun-Chul Lee
doaj   +2 more sources

Investigating APOKASC Red Giant Stars with Abnormal Carbon-to-nitrogen Ratios

open access: yesThe Astrophysical Journal, 2023
The success of galactic archeology and the reconstruction of the formation history of our Galaxy relies critically on precise ages for large populations of stars. For evolved stars in the red clump and red giant branch, the carbon-to-nitrogen ratio ([C/N]
Erica Bufanda   +4 more
doaj   +1 more source

Search for a Black Hole Binary in Gaia DR3 Astrometric Binary Stars with Spectroscopic Data

open access: yesThe Astrophysical Journal, 2023
We report the discovery of a candidate binary system consisting of a black hole (BH) and a red giant branch star in Gaia DR3. This binary system was discovered from 64,108 binary solutions for which both astrometric and spectroscopic data are available ...
Ataru Tanikawa   +5 more
doaj   +1 more source

Home - About - Disclaimer - Privacy