Results 41 to 50 of about 638,908 (320)
Blue stragglers in open clusters [PDF]
Astronomy & Astrophysics, 2001 We performed for the rst time a detailed LTE spectroscopic study of a sample of blue straggler stars in the moderately old open cluster NGC 7789. For eight stars the parameters and abundances of several elements were determined. The cluster members show a remarkable surface magnesium deciency which is quite unusual for late B - early A stars.
D. Schönberner +2 more
openaire +1 more source
M67 Blue Stragglers with High-resolution Infrared Spectroscopy
The Astronomical Journal, 2023 We report on the first detailed infrared chemical analysis of five binary members (S277, S997, S975, S1031, and S1195) in the open cluster M67 (NGC 2682).
K. E. Brady +7 more
doaj +1 more source
The Astrophysical Journal, 2023 We present the first far-UV (FUV) imaging results of the intermediate-age Galactic open cluster NGC 2818 that has a planetary nebula (PN) within the field using images taken from the Ultra Violet Imaging Telescope (UVIT) aboard AstroSat.
Sharmila Rani +3 more
doaj +1 more source
Binary origin of blue straggler stars in Galactic star clusters [PDF]
Astronomy & AstrophysicsBuilding 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.
M. Rain +7 more
semanticscholar +1 more source
Blue Straggler Formation in Clusters [PDF]
AIP Conference Proceedings, 2010 Blue stragglers are thought to be formed from the merger or coalescence of two stars, but the details of their formation in clusters has been difficult to disentangle. We discuss the two main formation mechanisms for blue stragglers (stellar collisions or mass transfer in a binary system).
Alison Sills +2 more
openaire +2 more sources
On the Origin of the Split Main Sequences of the Young Massive Cluster NGC 1856
The Astrophysical Journal, 2023 The detection of split main sequences (MSs) associated with young clusters (≲600 Myr) has attracted a lot of attention. A prevailing scenario is that a bimodality of stellar rotation distribution drives the bifurcation of the MS. Nevertheless, the origin
Li Wang +4 more
doaj +1 more source
A Wide Metallicity Range for Gyr-old Stars in the Nuclear Star Cluster
The Astrophysical Journal Letters, 2023 We report metallicities for three ∼Gyr-old stars in the Milky Way nuclear star cluster (NSC) using high-resolution near-infrared spectroscopy. We derive effective temperatures from a calibration with Sc line strength, which yields results in good ...
B. Thorsbro +8 more
doaj +1 more source
Blue straggler populations of seven open clusters with Gaia DR2 [PDF]
Monthly notices of the Royal Astronomical Society, 2020 Blue straggler stars (BSS) are well studied in globular clusters but their systematic study with secure membership determination is lacking in open clusters.
K. Vaidya +3 more
semanticscholar +1 more source
A fast-rotating blue straggler star in the tidal tail of the open cluster NGC 752 [PDF]
Astronomy & AstrophysicsNGC 752 is a well-known Galactic open cluster of intermediate age. In recent works, a very long and asymmetric tail was revealed. A blue straggler star (BSS) at the periphery of the tidal tail of the cluster was subsequently identified. We aim to perform
Chunyan Li +5 more
semanticscholar +1 more source
A Kinematic View of NGC 1261: Structural Parameters, Internal Dispersion, Absolute Proper Motion, and Blue Straggler Stars [PDF]
Astrophysical Journal, 2020 We constructed a Hubble Space Telescope (HST) astrophotometric catalog of the central region of the Galactic globular cluster NGC 1261. This catalog, complemented with Gaia DR2 data sampling the external regions, has been used to estimate the structural ...
S. Raso +10 more
semanticscholar +1 more source