A ROSAT HRI study of the open cluster NGC 3532

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dc.creatorFranciosini, E.
dc.creatorRandich, S.
dc.creatorPallavicini, R.
dc.date2000-03-07
dc.date.accessioned2026-07-07T01:52:39Z
dc.date.available2026-07-07T01:52:39Z
dc.descriptionNGC 3532 is a very rich southern open cluster of age ~200-350 Myr; it is therefore a good candidate to investigate the X-ray activity-age-rotation relationship at ages intermediate between the Pleiades and the Hyades, where, to our knowledge, X-rays studies exist for only one cluster (NGC 6475). We have performed an X-ray study of NGC 3532 using HRI observations retrieved from the ROSAT archive. The observations have a limiting sensitivity $L_{\mathrm x} \sim 4 \times 10^{28}$ erg sec$^{-1}$ in the center of the field. We detected ~50 X-ray sources above a $4 σ$ threshold, half of which have a known optical counterpart within 10 arcsec; 15 of the X-ray sources have at least one cluster member as optical counterpart. A comparison of NGC 3532 with the nearly coeval cluster NGC 6475 indicates that the former cluster is considerably X-ray underluminous with respect to NGC 6475. However, because of the existence of possible selection effects, additional X-ray and optical observations are needed before definitively concluding that the X-ray properties of NGC 3532 and NGC 6475 are significantly different.
dc.description6 pages, 3 figures, 3 tables, to appear in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0003091
dc.identifierhttp://arxiv.org/abs/astro-ph/0003091
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/689
dc.subjectAstrophysics
dc.titleA ROSAT HRI study of the open cluster NGC 3532
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