Results 71 to 80 of about 365 (142)

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

HIP 8522: A Puzzling Young Solar Twin with the Lowest Detected Lithium Abundance

The Astrophysical Journal
We present HIP 8522, a young solar twin with the lowest detected lithium abundance, potentially a field blue straggler or the result of episodic early accretion. Its stellar parameters ( T _eff  = 5729 ± 7 K, $\mathrm{log}\,g$  = 4.532 ± 0.016 dex, [Fe/H]
Jhon Yana Galarza, Diego Lorenzo-Oliveira, Thiago Ferreira, Henrique Reggiani, Aida Behmard, Joshua D. Simon, Eder Martioli, Ricardo López-Valdivia, Leandro de Almeida, Emiliano Jofré, Kareem El-Badry   +10 more
doaj   +1 more source

Binary origin of blue straggler stars in Galactic star clusters

Astronomy & Astrophysics
Building on the recent release of a new Gaia-based blue straggler star catalog in Galactic open star clusters (OCs), we explored the properties of these stars in a cluster sample spanning a wide range in fundamental parameters. We employed Gaia EDR3 to assess the membership of any individual blue or yellow straggler to their parent cluster.
M. J. Rain, M. S. Pera, G. I. Perren, O. G. Benvenuto, J. A. Panei, M. A. De Vito, G. Carraro, S. Villanova   +7 more
openaire   +4 more sources

The Blue Lurker WOCS 14020: A Long-period Post-common-envelope Binary in M67 Originating from a Merger in a Triple System

The Astrophysical Journal Letters
We present Hubble Space Telescope far-ultraviolet (FUV) spectra of a blue lurker–white dwarf (BL–WD) binary system in the 4 Gyr open cluster M67. We fit the FUV spectrum of the WD, determining it is a C/O WD with a mass of $0.7{2}_{-0.04}^{+0.05}$ M _ ...
Emily M. Leiner, Natalie M. Gosnell, Aaron M. Geller, Meng Sun, Robert D. Mathieu, Alison Sills   +5 more
doaj   +1 more source

UOCS-XI. Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat [PDF]

, 2023
Anju Panthi, Kaushar Vaidya, Nagaraj Vernekar, Annapurni Subramaniam, Vikrant V. Jadhav, Manan Agarwal   +5 more
openalex   +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

WIYN Open Cluster Study. XC. Barium Surface Abundances of Blue Straggler Stars in the Open Clusters NGC 7789 and M67

The Astrophysical Journal
We investigate barium (Ba) abundances in blue straggler stars (BSSs) in two open clusters, NGC 7789 (1.6 Gyr) and M67 (4 Gyr), as signatures of asymptotic-giant-branch (AGB) mass transfer.
Andrew C. Nine, Robert D. Mathieu, Simon C. Schuler, Katelyn E. Milliman   +3 more
doaj   +1 more source

CCD Photometry of the Globular Cluster M53. I. Color-Magnitude Data and Blue Straggler Stars [PDF]

, 1998
Soo‐Chang Rey, Young‐Wook Lee, Yong-Ik Byun, Mun‐Suk Chun   +3 more
openalex   +1 more source

UOCS – XI. Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat [PDF]

, 2023
Anju Panthi, Kaushar Vaidya, Nagaraj Vernekar, Annapurni Subramaniam, Vikrant V. Jadhav, Manan Agarwal   +5 more
openalex   +1 more source

Characterization of the Blue Straggler Star Populations, through Statistical, Photometric, and Spectral Energy Distribution Analysis, in the Old Open Cluster: NGC 2243

The Astronomical Journal
We present a statistical, photometric, and spectral energy distribution (SED) analysis of the poorly studied old open cluster: NGC 2243, to characterize its blue straggler star (BSS) population.
A. H. Sheikh, Biman J. Medhi
doaj   +1 more source