Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

The origin of very massive stars around NGC 3603

Kalari, VM, Vink, JS, de Wit, WJ, Bastian, N and Mendez, RA (2019) The origin of very massive stars around NGC 3603. ASTRONOMY & ASTROPHYSICS, 625. ISSN 1432-0746

[img]
Preview
Text
on_the_origin_of_very_massive_stars_around_NGC3603.pdf - Published Version

Download (5MB) | Preview
Open Access URL: https://arxiv.org/pdf/1904.02126.pdf (Accepted version)

Abstract

The formation mechanism of the most massive stars in the Universe remains an unsolved problem. Are they able to form in relative isolation in a manner similar to the formation of solar-type stars, or do they necessarily require a clustered environment? In order to shed light on this important question, we study the origin of two very massive stars (VMS): the O2.5If*/WN6 star RFS7 (∼100 M⊙), and the O3.5If* star RFS8 (∼70 M⊙), found within ∼53 and 58 pc, respectively, of the Galactic massive young cluster NGC 3603, using Gaia data. The star RFS7 is found to exhibit motions resembling a runaway star from NGC 3603. This is now the most massive runaway star candidate known in the Milky Way. Although RFS8 also appears to move away from the cluster core, it has proper-motion values that appear inconsistent with being a runaway from NGC 3603 at the 3σ level (but with substantial uncertainties due to distance and age). Furthermore, no evidence for a bow-shock or a cluster was found surrounding RFS8 from available near-infrared photometry. In summary, whilst RFS7 is likely a runaway star from NGC 3603, making it the first VMS runaway in the Milky Way, RFS8 is an extremely young (∼2 Myr) VMS, which might also be a runaway, but this would need to be established from future spectroscopic and astrometric observations, as well as precise distances. If RFS 8 was still not found to meet the criteria for being a runaway from NGC 3603 from such future data, this would have important ramifications for current theories of massive star formation, as well as the way the stellar initial mass function is sampled.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: EDP SCIENCES S A
Related URLs:
Date Deposited: 21 Jun 2019 14:47
Last Modified: 21 Jun 2019 14:47
DOI or Identification number: 10.1051/0004-6361/201935107
URI: http://researchonline.ljmu.ac.uk/id/eprint/10921

Actions (login required)

View Item View Item