Results 61 to 70 of about 139 (112)

A Thorough Exploration of the Metal-rich Massive Open Cluster NGC 6253: Focusing on Membership, Binaries, Stragglers, and Mass Function

The Astrophysical Journal
This study provides an in-depth analysis of the ancient open galactic cluster NGC 6253, characterized by the presence of both blue and yellow straggler stars.
Huanbin Chi, Feng Wang
doaj   +1 more source

The incidence of magnetism in blue and yellow straggler stars

Astronomy & Astrophysics
Context. Our understanding of the generation of magnetic fields in intermediate-mass and massive OBA stars remains limited. Some theories have proposed that their magnetic fields could be a result of strong binary interactions, including stellar mergers.
S. Hubrig, S. P. Järvinen, I. Ilyin, M. Schöller   +3 more
openaire   +2 more sources

UOCS. XIII. Study of the Far-ultraviolet Bright Stars in the Open Cluster NGC 2420 Using AstroSat

The Astrophysical Journal
We present the study of four far-ultraviolet (FUV) bright stars in the field of the open cluster NGC 2420 using the Ultra Violet Imaging Telescope mounted on AstroSat.
R. K. S. Yadav, Arvind K. Dattatrey, Geeta Rangwal, Annapurni Subramaniam, D. Bisht, Ram Sagar   +5 more
doaj   +1 more source

New parameters for star-cluster dynamics: Observational results

Astronomy & Astrophysics
We recently used a large set of Monte Carlo simulations of globular clusters (GCs) to define new, fully empirical parameters (named A51, P51, and S2.5) able to trace the internal dynamical evolution of dense stellar systems.
Lanzoni B., Ferraro F. R., Vesperini E.
doaj   +1 more source

UOCS-XIX. A Multiwavelength Study of Open Cluster Trumpler 5: Cluster Properties and Exotic Populations

The Astronomical Journal
Trumpler 5 is a populous, intermediate-age (∼3 Gyr), metal-poor ([Fe/H] ∼ −0.4) open cluster, located at a distance of approximately ∼3050 pc. This is a well-studied cluster for its broadened main-sequence (MS) and blue straggler star (BSS) population ...
Komal Chand, Anju Panthi, Kaushar Vaidya
doaj   +1 more source

Revisiting the Evidence for Double Sequences of Blue Straggler Stars in Globular Clusters

The Astronomical Journal
Blue straggler stars (BSSs) are believed to form through mass transfer in binary systems or stellar collisions. The reported presence of double BSS sequences in some globular clusters (GCs) has been interpreted as evidence that these two formation ...
Gourav Kumawat, Craig O. Heinke, Alison Sills, Haldan N. Cohn, Phyllis M. Lugger, Christian Knigge, Andrea Dieball, Tyler Heise   +7 more
doaj   +1 more source

Blue Straggler Stars: Early Observations That Failed to Solve the Problem [PDF]

, 2014
In this chapter, I describe early ideas on blue stragglers, and various observations (some published, some not) that promised but failed to resolve the question of their origin. I review the data and ideas that were circulating from Allan Sandage's original discovery in 1953 of "anomalous blue stars" in the globular cluster M3, up until about 1992 ...
openaire   +2 more sources

Study of Integrated Far-ultraviolet Emissions from Galactic Globular Clusters Using AstroSat/UVIT Observations

The Astrophysical Journal
We used observations obtained with the Ultraviolet Imaging Telescope on board the AstroSat satellite to measure the integrated far-ultraviolet (FUV) and optical ( V ) magnitudes of 30 Galactic globular clusters (GCs).
Sonika Piridi, Ranjan Kumar, Divya Pandey, Ananta C. Pradhan   +3 more
doaj   +1 more source

Multiwavelength Study of Blue Straggler Stars in Tombaugh 2: Evidence for Binary Mass Transfer and Constraints on Cluster Dynamical State

The Astrophysical Journal
We present a focused multiwavelength study of blue straggler stars (BSSs) in the intermediate-age open cluster Tombaugh 2, located in the outer Galactic disk, to constrain the dominant formation pathways of BSSs in a low-density environment.
D. Bisht, Ing-Guey Jiang, K. Belwal, D. C. Çinar, Arvind K. Dattatrey, Geeta Rangwal, A. Raj, Shraddha Biswas, Mohit Singh Bisht, Alok Durgapal   +9 more
doaj   +1 more source

Variability in the Massive Open Cluster NGC 1817 from K2: A Rich Population of Asteroseismic Red Clump, Eclipsing Binary, and Main-sequence Pulsating Stars. [PDF]

Astron J, 2020
Sandquist EL, Stello D, Arentoft T, Brogaard K, Grundahl F, Vanderburg A, Hedlund A, DeWitt R, Ackerman TR, Aguilar M, Buckner AJ, Juarez C, Ortiz AJ, Richarte D, Rivera DI, Schlapfer L.   +15 more
europepmc   +1 more source