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Palomar 6 globular cluster investigated in detail

Palomar 6 globular cluster investigated in detail
Shade picture from the VVV survey for Pal 6. Credit score: Souza et al., 2021.

A global crew of astronomers has carried out an in depth examine of a globular cluster referred to as Palomar 6 (or Pal 6 for brief). Outcomes of the analysis may assist us higher perceive the character of this cluster. The examine was detailed in a paper printed September 9 on arXiv.org.

Globular clusters (GCs) are collections of tightly sure stars orbiting galaxies. Astronomers understand them as pure laboratories enabling research on the evolution of stars and galaxies. Specifically, globular clusters may assist researchers higher perceive the formation historical past and evolution of early sort galaxies, because the origin of GCs appears to be intently linked to intervals of intense star formation.

Palomar 6 is a globular cluster within the constellation Ophiuchus, projected towards the galactic bulge. It’s one in every of just a few GCs identified to comprise a planetary nebula. Though a number of research of Pal 6 have been carried out, there are nonetheless some uncertainties concerning the parameters of this cluster, like its distance, age or metallicity.

To resolve these uncertainties, a gaggle of astronomers led by Stefano Souza of the College of São Paulo in Brazil, has carried out a photo-chemo-dynamical evaluation of Pal 6. As a part of the examine, the researchers analyzed the high-resolution spectra obtained with the FLAMES-UVES spectrograph at ESO’s Very Massive Telescope (VLT) and photometric knowledge from the Hubble Area Telescope (HST).

“We current a whole and detailed evaluation of the poorly understood GC, Pal 6, by way of the evaluation of high-resolution spectra of the UVES spectrograph, HST photometry, and a dynamical evaluation,” the astronomers wrote within the paper.

The researchers investigated a pattern of six stars, out of which 4 turned out to be members of Pal 6. Based mostly on this, they discovered that the cluster has a imply radial velocity of 174.3 km/s and a imply metallicity at a stage of -1.1.

Moreover, the chemical evaluation of Pal 6 exhibits that it has an alpha-element enhancement of about 0.35. The abundances of each first- and second-peak heavy parts have been discovered to be comparatively excessive—0.4-0.6 and 0.4-0.5, respectively. The evaluation additionally signifies that the europium component is enhanced, whereas silicon, calcium and titanium showcase generally low enhancement.

In response to the examine, one member star of Pal 6 displays enhancements in nitrogen and aluminum (about 0.3). The astronomers famous that this outcome suggests the presence of a second stellar inhabitants on this cluster.

The analysis discovered that Pal 6 is a few 12.4 billion years previous and is situated about 25,000 mild years away from the Earth. Moreover, the orbital evaluation signifies that the cluster is confined inside the galactic bulge and was most likely shaped within the main-bulge progenitor.

“The current evaluation signifies that the globular cluster Pal 6 is situated within the bulge quantity and that it was most likely shaped in bulge within the early levels of the Milky Manner formation,” the authors of the paper concluded.


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Extra data:
Stefano O. Souza et al, Photograph-chemo-dynamical evaluation and the origin of the bulge globular cluster, Palomar 6. arXiv:2109.04483v1 [astro-ph.GA], arxiv.org/abs/2109.04483

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