A New X-Ray Analysis of the Open Cluster Blanco 1 Using Wide-Field BVIc Photometric and Proper Motion Surveys

Abstract

We perform a new analysis of the extant ROSAT and XMM-Newton X-ray surveys of the southern open cluster Blanco 1, utilizing new BVIc photometric and proper motion data sets. In our study, we match optical counterparts to 47 X-ray sources associated with Blanco 1 cluster members, 6 of which were listed in previous X-ray studies as cluster nonmembers. Our new catalog of optical counterparts to X-ray sources clearly traces out the Blanco 1 main sequence in a CMD, extending from early G to mid-M spectral types. Additionally, we derive new Lx as well as Lx/Lbol ratios for confirmed cluster members. We compare these X-ray properties to other young open clusters, including the coeval Pleiades cluster, to investigate the relationship between age and X-ray activity. We find that stars in Blanco 1 generally exhibit X-ray properties similar to those of other open clusters, namely increasing Lx/Lbol with reducing mass for earlier-type stars, and a saturation limit of Lx/Lbol at a magnitude of 10^-3 for stars with V-Ic > 1.25. More generally, the X-ray detected stars in Blanco 1 have X-ray emission magnitudes that agree with the overall trends seen in the other young clusters. In a direct comparison of Blanco 1 to the Pleiades open cluster, members of both clusters have similar X-ray characteristics; however, there does appear to be some discrepancies in the distribution of Lx/Lbol as a function of color that may be related to scatter seen in the Pleiades CMD. Moreover, previous comparisons of this nature for Blanco 1 were not possible due to the reliance on photographic photometry. This is where the power of precise, homogeneous, and standardized CCD photometry allows for a high fidelity, detailed study of the X-ray properties of stars in Blanco 1. [abridged]

arXiv comment16 Pages, 11 Figures, 4 Tables, accepted for publication in The Astronomical Journal

References in corpus (19)

• The u'g'r'i'z' Standard Star Network
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample
• On the rotational evolution of solar- and late-type stars, its magnetic origins, and the possibility of stellar gyrochronology
• The second US Naval Observatory CCD Astrograph Catalog (UCAC2)
• Keck Spectra of Pleiades Brown Dwarf Candidates and a Precise Determination of the Lithium Depletion Edge in the Pleiades
• X-ray astronomy of stellar coronae (Review)
• X-ray emitting young stars in the Orion Nebula
• Confirmation of Errors in Hipparcos Parallaxes from HST/FGS Astrometry of the Pleiades
• A maximum likelihood method for fitting colour-magnitude diagrams
• Brown dwarfs and very low mass stars in the Hyades cluster : a dynamically evolved mass function
• X-ray Emission From Nearby M-dwarfs: the Super-saturation Phenomenon
• X-ray Properties of Pre--Main-Sequence Stars in the Orion Nebula Cluster with Known Rotation Periods
• The lower mass function of the young open cluster Blanco 1: from 30 Mjup to 3 Mo
• An XMM-Newton observation of the young open cluster NGC 2547: coronal activity at 30 Myr
• Elemental abundances in the Blanco 1 open cluster
• WIYN Open Cluster Study. XXVI. Improved kinematic membership and spectroscopy of IC 2391
• Lithium in Blanco1: Implications for Stellar Mixing
• XMM-Newton observation of the young open cluster Blanco 1. I. X-ray spectroscopy and photometry
• Deep X-ray survey of the young open cluster NGC 2516 with XMM-Newton

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• Identification of the Lithium Depletion Boundary and Age of the Southern Open Cluster Blanco 1
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• Lithium depletion boundary, stellar associations, and Gaia
• The rotation period distribution of the rich Pleiades-age Southern open cluster NGC 2516. Existence of a representative zero-age main sequence distribution
• Employing a New BVIc Photometric Survey of IC 4665 to Investigate the Age of this Young Open Cluster
• The X-ray luminosity function of M37 and the evolution of coronal activity in low-mass stars
• Debris Disks of Members of the Blanco 1 Open Cluster
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