Results 51 to 60 of about 2,386 (209)

Blazhko modulation in first-overtone RR Lyrae stars from the OGLE Collection

EPJ Web of Conferences, 2017
We present results of the first comprehensive study of the Blazhko effect in first-overtone RR Lyrae stars from the Galactic bulge based on the Optical Gravitational Lensing Experiment data.
Netzel Henryka, Smolec Radoslaw, Soszński Igor   +2 more
doaj   +1 more source

Elemental abundances in AGB stars and the formation of the Galactic bulge

EPJ Web of Conferences, 2012
We obtained high-resolution near-IR spectra of 45 AGB stars located in the Galactic bulge. The aim of the project is to determine key elemental abundances in these stars to help constrain the formation history of the bulge.
Wood P.R., Ryde N., Lebzelter T., Blommaert J.A.D.L., Uttenthaler S., Schultheis M., Aringer B.   +6 more
doaj   +1 more source

A PUZZLE INVOLVING GALACTIC BULGE MICROLENSING EVENTS [PDF]

The Astrophysical Journal, 2010
We study a sample of 16 microlensed Galactic bulge main sequence turnoff region stars for which high dispersion spectra have been obtained with detailed abundance analyses. We demonstrate that there is a very strong and highly statistically significant correlation between the maximum magnification of the microlensed bulge star and the value of the [Fe ...
Cohen, Judith G, Gould, A, Thompson, Ian, Feltzing, Sofia, Bensby, T, Johnson, Jennifer A, Huang, Wenjin, Melendez, Jorge, Lucatello, Sara, Asplund, Martin   +9 more
openaire   +4 more sources

When the Stars Align: A 5σ Concordance of Planetary Nebulae Major Axes in the Center of Our Galaxy

The Astrophysical Journal Letters, 2023
We report observations of a remarkable major axes alignment nearly parallel to the Galactic plane of 5 σ significance for a subset of bulge “planetary nebulae” (PNe) that host, or are inferred to host, short-period binaries. Nearly all are bipolar. It is
Shuyu Tan, Quentin A. Parker, Albert A. Zijlstra, Andreas Ritter, Bryan Rees   +4 more
doaj   +1 more source

MOA-2007-BLG-400 A Super-Jupiter-mass Planet Orbiting a Galactic Bulge K-dwarf Revealed by Keck Adaptive Optics Imaging [PDF]

, 2021
Aparna Bhattacharya, D. P. Bennett, Jean‐Philippe Beaulieu, I. A. Bond, Naoki Koshimoto, Jessica R. Lu, Joshua W. Blackman, Aikaterini Vandorou, Sean K. Terry, V. Batista, J. B. Marquette, Andrew A. Cole, Akihiko Fukui, Calen B. Henderson, ‪Clément Ranc   +14 more
openalex   +1 more source

PNe Abundances: Galactic Bulge versus the Disc [PDF]

Astrophysics and Space Science, 2001
We compare the abundances of He, N, O, Ar, S, and Ne, determined in a similar way, for a sample of Galactic bulge and disc planetary nebulae (PNe). We find that in all aspects — average abundances and dispersion, distribution functions, abundance relationships, and the ratio of N/O — the bulge and disc PNe are indistinguishable.
Exter, K, Barlow, MJ, Walton, NA, Clegg, RES   +3 more
openaire   +2 more sources

New Light on Dark Extended Lenses with the Roman Space Telescope

The Astrophysical Journal Letters
The Roman Space Telescope’s Galactic Bulge Time Domain Survey will constitute the most sensitive microlensing survey of the Galactic bulge to date, opening up new opportunities to search for dark matter (DM). Many extensions of the Standard Model predict
William DeRocco, Nolan Smyth, Volodymyr Takhistov   +2 more
doaj   +1 more source

Are the Distribution of Einstein Crossing Times of Galactic Microlensing Events Bimodal? [PDF]

Journal of Astronomy and Space Sciences, 2012
The observed distribution of a blending-corrected sample of Einstein ring crossing times, tE, for microlensing events toward the galactic bulge/bar are analyzed.
Mitchell F. Struble, Thulsi Wickramasinghe   +1 more
doaj   +1 more source

Deep NIR Surveys in the Galactic Plane: A General Overview and the Study of Scutum’s Spiral Arm

Frontiers in Astronomy and Space Sciences, 2021
Despite the impressive advances in Galactic structure studies, thanks to the large astronomical surveys, there remain several open questions. Although at low distances, optical surveys can bring us important information, the potential of NIR surveys ...
E. B. Amôres, R. S. Levenhagen
doaj   +1 more source

Type Ia supernova-driven Galactic bulge wind [PDF]

Monthly Notices of the Royal Astronomical Society, 2009
Stellar feedback in galactic bulges plays an essential role in shaping the evolution of galaxies. To quantify this role and facilitate comparisons with X-ray observations, we conduct 3D hydrodynamical simulations with the adaptive mesh refinement code, FLASH, to investigate the physical properties of hot gas inside a galactic bulge, similar to that of ...
Tang, S, Wang, QD, Low, M-MM, Joung, MR
openaire   +3 more sources