Researchers detect the properties of globular cluster NGC 6355

Researchers detect the properties of globular cluster NGC 6355

Research explores the properties of globular cluster NGC 6355
F438W/F555W blended colour describe from the HST WFC3 digicam for NGC 6355. Credit: Souza et al., 2023.

An world crew of astronomers has performed a chrono-chemodynamical prognosis of a Galactic globular cluster is known as NGC 6355. Results of the see, presented in a paper printed January 12 on the arXiv preprint server, inform fundamental insights into the properties and chemical composition of this cluster.

Globular clusters (GCs) are collections of tightly certain stars orbiting galaxies. Astronomers eye them as pure laboratories enabling research on the evolution of stars and galaxies. In direct, globular clusters would per chance per chance presumably aid researchers better perceive the formation historical past and evolution of early form galaxies, because the muse of GCs seems to be carefully linked to classes of intense superstar formation.

At a distance of some 28,300 gentle years far from the Earth, NGC 6355 (is also known as GCl-63 or ESO 519-SC15) is a globular cluster within the constellation Ophiuchus. It is a well-known cluster that has been studied for the explanation that 1900s. Old observations of NGC 6355 obtain found that it has a pretty excessive mass of about 101,000 solar masses, reddening at a stage of 0.82 and its metallicity is approximately -1.46. The absolute age of the cluster is estimated to be 13.2 billion years.

No longer too long ago, a community of astronomers led by Stefano O. Souza of the College of São Paulo in Brazil, has investigated NGC 6355 with the essential procedure of shedding more gentle on its historical past and properties.

“Within the inform their own praises work, we mix the chemical information with photometric and dynamical properties of the cluster to constrain its historical past. The chemical information is in accordance to the UVES spectrograph (Dekker et al, 2000) in FLAMES-UVES mode on the ESO-VLT, the photometry on HST data, and the dynamical properties are provided by orbital integration utilizing the McMillan (2017) Galactic doable,” the researchers defined.

Most frequently, the crew analyzed the globular cluster NGC 6355 within the context of the evolution of the Galactic bulge. They performed a deep and careful prognosis, along with photometry, chemical abundances, and dynamics.

The see found that NGC 6355 has a metallicity of −1.39, which confirms that it is one of many most steel-sad clusters of the Galactic bulge. The mean abundance ratio of alpha substances to iron of NGC 6355 used to be measured to be 0.37, suggesting an enrichment from Form II supernovae. All in all, the astronomers concluded that the abundance pattern of NGC 6355 is wisely matched with bulge field RR Lyrae stars and in-situ wisely-studied GCs.

The research confirmed that NGC 6355 is set 13.2 billion years former and complex its distance because it became out that the cluster is nearer than previously idea—approximately 27,800 gentle years away. Furthermore, the orbital parameters of NGC 6355 and its extinction coefficient at a stage of 2.84, reward that the cluster is currently confined within the Galactic bulge volume.

The authors of the paper concluded that this GC seems to acquire originated from the essential-bulge progenitor, with a low chance of an ex-situ foundation; nonetheless, more spectroscopic data of the cluster stars are required in expose to confirm this.

More information:
Stefano O. Souza et al, Chrono-chemodynamical prognosis of the globular cluster NGC 6355: Shopping for the basic bricks of the Bulge, arXiv (2023). DOI: 10.48550/arxiv.2301.05227

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