Results 21 to 30 of about 462 (193)

The Earliest Stage of Galactic Star Formation

The Astrophysical Journal Letters, 2023
Using a recently developed technique to estimate gas temperatures ( T _SF ) in star-forming regions from large photometric surveys, we propose a diagram, analogous to the Hertzsprung–Russell diagram for individual stars, to probe the evolution of ...
Charles L. Steinhardt, Vadim Rusakov, Thomas H. Clark, Andrei Diaconu, John Forbes, Conor McPartland, Albert Sneppen, John Weaver   +7 more
doaj   +1 more source

CCD UBV and Gaia DR3 Analyses of the Open Clusters King 6 and NGC 1605

The Astronomical Journal, 2023
A detailed analysis of ground-based CCD UBV photometry and space-based Gaia Data Release 3 (DR3) data for the open clusters King 6 and NGC 1605 was performed.
Sevinc Gokmen, Zeki Eker, Talar Yontan, Selçuk Bilir, Tansel Ak, Serap Ak, Timothy Banks, Ata Sarajedini   +7 more
doaj   +1 more source

The Sonified Hertzsprung-Russell Diagram

Proceedings of the 28th International Conference on Auditory Display (ICAD2023), 2023
Understanding the physical properties of stars, and putting these properties into the context of stellar evolution, is a core challenge in astronomical research. A key visualization in studying stellar evolution is the Hertzsprung-Russell diagram (HRD), organizing data about stellar luminosity and colour into a form that is informative about stellar ...
Huppenkothen, Daniela, Pampin, Juan, Davenport, James R. A., Wenlock, James   +3 more
openaire   +2 more sources

Identification of young nearby runaway stars based on Gaia data and the lithium test†

Astronomische Nachrichten, Volume 341, Issue 9, Page 908-942, November 2020., 2020
Abstract Young nearby runaway stars are suitable to search for their place of origin and possibly associated objects, for example, neutron stars. Tetzlaff et al. (2011) selected young (≤50 Myr) runaway star candidates from Hipparcos, for which they had estimated the ages from the location in the Hertzsprung‐Russell diagram and evolutionary models. Here,
Richard Bischoff, Markus Mugrauer, Guillermo Torres, Theresa Heyne, Oliver Lux, Vera Munz, Ralph Neuhäuser, Susanne Hoffmann, Anja Trepanovski   +8 more
wiley   +1 more source

Rotation of solar‐like stars in the immediate solar neighborhood

Astronomische Nachrichten, Volume 341, Issue 5, Page 497-507, June 2020., 2020
Abstract Although photometric space‐based missions such as CoRoT or Kepler have yielded rotation measurements of many thousands of late‐type stars during the last decade, the rotational properties of the bulk of the G star population remain undetected by these missions.
Jürgen H. M. M. Schmitt, Marco Mittag
wiley   +1 more source

Modified Least Trimmed Quantile Regression to Overcome Effects of Leverage Points

Mathematical Problems in Engineering, Volume 2020, Issue 1, 2020., 2020
Quantile regression estimates are robust for outliers in y direction but are sensitive to leverage points. The least trimmed quantile regression (LTQReg) method is put forward to overcome the effect of leverage points. The LTQReg method trims higher residuals based on trimming percentage specified by the data.
Habshah Midi, Taha Alshaybawee, Mohammed Alguraibawi, Emilio Gómez-Déniz   +3 more
wiley   +1 more source

Resonant Mode Coupling in δ Scuti Stars

The Astrophysical Journal, 2023
Delta Scuti ( δ Sct) variables are intermediate-mass stars that lie at the intersection of the main sequence and the instability strip on the Hertzsprung–Russell diagram.
Mohammed Mourabit, Nevin N. Weinberg
doaj   +1 more source

The Hubble Space Telescope Survey of M31 Satellite Galaxies. II. The Star Formation Histories of Ultrafaint Dwarf Galaxies

The Astrophysical Journal, 2023
We present the lifetime star formation histories (SFHs) for six ultrafaint dwarf (UFD; M _V > − 7.0, $4.9\lt {\mathrm{log}}_{10}({M}_{* }(z=0)/{M}_{\odot })\lt 5.5$ ) satellite galaxies of M31 based on deep color–magnitude diagrams constructed from ...
Alessandro Savino, Daniel R. Weisz, Evan D. Skillman, Andrew Dolphin, Andrew A. Cole, Nitya Kallivayalil, Andrew Wetzel, Jay Anderson, Gurtina Besla, Michael Boylan-Kolchin, Thomas M. Brown, James S. Bullock, Michelle L. M. Collins, M. C. Cooper, Alis J. Deason, Aaron L. Dotter, Mark Fardal, Annette M. N. Ferguson, Tobias K. Fritz, Marla C. Geha, Karoline M. Gilbert, Puragra Guhathakurta, Rodrigo Ibata, Michael J. Irwin, Myoungwon Jeon, Evan N. Kirby, Geraint F. Lewis, Dougal Mackey, Steven R. Majewski, Nicolas Martin, Alan McConnachie, Ekta Patel, R. Michael Rich, Joshua D. Simon, Sangmo Tony Sohn, Erik J. Tollerud, Roeland P. van der Marel   +36 more
doaj   +1 more source

Energetic properties of stellar pulsations across the Hertzsprung-Russell diagram

EPJ Web of Conferences, 2015
I will review types of modes which are observed in stars with different masses and on various evolutionary stages. In particular, I will focus on energetic aspects of oscillation modes, i.e., excitation, distribution of kinetic energy, mode amplitude and
Daszyńska-Daszkiewicz Jadwiga
doaj   +1 more source

On the Modeling of Algol-Type Binaries

Galaxies, 2021
In earlier papers, we presented a binary evolutionary code for the purpose of reproducing the orbital parameters, masses, radii, and location in the Hertzsprung Russell diagram (abbreviated as HRD) of well-observed Algol systems.
Walter van Rensbergen, Jean-Pierre de Greve   +1 more
doaj   +1 more source