Cataclysmic Variables and Other Compact Binaries in the Globular Cluster NGC 362: Candidates from Chandra and HST
| Autor: | B. Margon, B. Beck-Winchatz, L. Homer, D. Pooley, C. G. Bassa, S. F. Anderson, W. H. G. Lewin, F. Verbunt, A. K. H. Kong, R. M. Plotkin, Vicky Kologera, Marc van der Sluys |
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| Přispěvatelé: | High Energy Astrophys. & Astropart. Phys (API, FNWI) |
| Rok vydání: | 2010 |
| Předmět: |
Physics
Brightness education.field_of_study Crowding in Astrophysics::High Energy Astrophysical Phenomena Population FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Highly sensitive Photometry (optics) Astrophysics - Solar and Stellar Astrophysics Globular cluster Astrophysics::Solar and Stellar Astrophysics Low Mass education Image resolution Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | International Conference on Binaries, Mykonos, Greece, 22-25 June 2010: in celebration of Ron Webbink's 65th birthday, 163-168 STARTPAGE=163;ENDPAGE=168;TITLE=International Conference on Binaries, Mykonos, Greece, 22-25 June 2010 |
| DOI: | 10.48550/arxiv.1011.1005 |
| Popis: | Highly sensitive and precise X-ray imaging from Chandra, combined with the superb spatial resolution of HST optical images, dramatically enhances our empirical understanding of compact binaries such as cataclysmic variables and low mass X-ray binaries, their progeny, and other stellar X-ray source populations deep into the cores of globular clusters. Our Chandra X-ray images of the globular cluster NGC 362 reveal 100 X-ray sources, the bulk of which are likely cluster members. Using HST color-magnitude and color-color diagrams, we quantitatively consider the optical content of the NGC 362 Chandra X-ray error circles, especially to assess and identify the compact binary population in this condensed-core globular cluster. Despite residual significant crowding in both X-rays and optical, we identify an excess population of H{\alpha}-emitting objects that is statistically associated with the Chandra X-ray sources. The X-ray and optical characteristics suggest that these are mainly cataclysmic variables, but we also identify a candidate quiescent low mass X-ray binary. A potentially interesting and largely unanticipated use of observations such as these may be to help constrain the macroscopic dynamic state of globular clusters. Comment: 6 pages, 6 figures, to appear in the proceedings of the conference "Binary Star Evolution: Mass Loss, Accretion, and Mergers," Mykonos, Greece, June 22-25, 2010 |
| Databáze: | OpenAIRE |
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