Zobrazeno 1 - 10
of 165
pro vyhledávání: '"Blue straggler stars"'
Publikováno v:
The Astrophysical Journal Letters, Vol 970, Iss 2, p L39 (2024)
We report the discovery of a barium blue straggler star (BSS) in M67, exhibiting enhancements in slow neutron-capture ( s -)process elements. Spectroscopic analysis of two BSSs (WOCS 9005 & WOCS 1020) and four stars located near the main-sequence tur
Externí odkaz:
https://doaj.org/article/b37259bd4fea4b299632628870eaa93a
Autor:
Fengqing Yu, Ting S. Li, Joshua S. Speagle, Gustavo E. Medina, Sergey E. Koposov, Joss Bland-Hawthorn, Lara R. Cullinane, Gwendolyn M. Eadie, Denis Erkal, Geraint F. Lewis, Guilherme Limberg, Daniel B. Zucker
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 81 (2024)
Blue horizontal branch stars (BHBs), excellent distant tracers for probing the Milky Way’s halo density profile, are distinguished in the ${\left(g-r\right)}_{0}$ versus ( i − z ) _0 color space from another class of stars, blue straggler stars.
Externí odkaz:
https://doaj.org/article/dea9648807754bf8aefef0eaca25cd9b
Publikováno v:
The Astronomical Journal, Vol 168, Iss 5, p 205 (2024)
NGC 2506 is a rich, intermediate-age (2.0 Gyr), metal-poor ([Fe/H] ∼ −0.2) open cluster. This work presents the results of 12,157 spectroscopic radial-velocity measurements of 2442 stars in the NGC 2506 field obtained over 41 yr, made as part of
Externí odkaz:
https://doaj.org/article/8886b7d3c8884d2689d9f32e34813fba
Publikováno v:
The Astronomical Journal, Vol 168, Iss 5, p 204 (2024)
We investigate the evolutionary stages of four open clusters—Berkeley 39, Collinder 261, NGC 6819, and NGC 7789—of ages ranging from 1.6 to 6 Gyr. These clusters have previously been classified into dynamically young and intermediate age groups b
Externí odkaz:
https://doaj.org/article/24b2c2979bf64c5f87424ec9bb6192c7
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 80 (2024)
Motivated by measurements of the rotation speed of accretor stars in post-mass-transfer (post-MT) systems, we investigate how magnetic braking affects the spin-down of individual stars during binary evolution with the MESAbinary module. Unlike the co
Externí odkaz:
https://doaj.org/article/11d93aa97faf4e57979f6065a60508c7
Publikováno v:
The Astronomical Journal, Vol 168, Iss 3, p 97 (2024)
We study the intermediate-age open cluster NGC 2627, located at a distance of ∼2 kpc, using UVIT/AstroSat and other archival data. Using a machine learning-based algorithm, ML-MOC, on the Gaia DR3 data, we identify 422 cluster members, including fo
Externí odkaz:
https://doaj.org/article/a19ff40bd72941198144a6a421c1f0a9
Autor:
Li Wang, Licai Deng, Xiaoying Pang, Long Wang, Richard de Grijs, Antonino P. Milone, Chengyuan Li
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 21 (2024)
The presence of young stellar populations in the Large Magellanic Cloud cluster NGC 1783 has caught significant attention, with suggestions ranging from it being a genuine secondary stellar generation to a population of blue straggler stars or simply
Externí odkaz:
https://doaj.org/article/e4fd3a2c9f8045fe872baea2269be912
Wind Roche-lobe Overflow in Low-mass Binaries: Exploring the Origin of Rapidly Rotating Blue Lurkers
Autor:
Meng Sun, Sasha Levina, Seth Gossage, Vicky Kalogera, Emily M. Leiner, Aaron M. Geller, Zoheyr Doctor
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 8 (2024)
Wind Roche-lobe overflow (WRLOF) is a mass-transfer mechanism proposed by Mohamed and Podsiadlowski for stellar binaries wherein the wind acceleration zone of the donor star exceeds its Roche-lobe radius, allowing stellar wind material to be transfer
Externí odkaz:
https://doaj.org/article/73ef1bd9e7db43a78bad7ec9289dcb4c
Autor:
S. Jane Arthur, Gloria Koenigsberger, Kristin Brady, Diana Estrella-Trujillo, Catherine Pilachowski
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 1, p 69 (2024)
The kinetic energy in tidal flows, when converted into heat, can affect the internal structure of a star and shift its location on a color–magnitude diagram from that of standard models. In this paper we explore the impact of injecting heat into st
Externí odkaz:
https://doaj.org/article/e0bd5ea51ec3401fb75ad53f3221ddf4
Autor:
Alex Billi, Francesco R. Ferraro, Alessio Mucciarelli, Barbara Lanzoni, Mario Cadelano, Lorenzo Monaco, Mario Mateo, John I. Bailey III, Megan Reiter, Edward W. Olszewski
Publikováno v:
The Astrophysical Journal, Vol 956, Iss 2, p 124 (2023)
We used high-resolution spectra acquired with the Magellan Telescope to measure radial and rotational velocities of approximately 200 stars in the Galactic globular cluster NGC 3201. The surveyed sample includes blue straggler stars (BSSs) and refere
Externí odkaz:
https://doaj.org/article/6e751f44ceda426e87097060b3cd9c58