The ChaMP Extended Stellar Survey (ChESS): Photometric and Spectroscopic Properties of Serendipitously Detected Stellar X-ray Sources

Abstract

We present 348 X-ray emitting stars identified from correlating the Extended Chandra Multiwavelength Project (ChaMP), a serendipitous wide-area X-ray survey, with the Sloan Digital Sky Survey (SDSS). We use morphological star/galaxy separation, an SDSS quasar catalog, an optical color-magnitude cut, and X-ray data quality tests to create our catalog, the ChaMP Extended Stellar Survey (ChESS), from a sample of 2121 matched ChaMP/SDSS sources. Our cuts retain 92% of the spectroscopically confirmed stars while excluding 99.6% of the 684 spectoscopically confirmed extragalactic sources. Fewer than 3% of the sources in our final catalog are previously identified stellar X-ray emitters; we expect ~10% of the catalog is composed by giants, and identify seven giant stars and three cataclysmic variables. We derive distances, X-ray and bolometric luminosities for these stars, revealing that this catalog fills the gap between the nearby stars identified by the ROSAT All-Sky Survey and the more distant stars detected in deep Chandra and XMM-Newton surveys. For 36 newly identified X-ray emitting M stars we calculate L_(Halpha)/L_(bol). L_(Hα)/L_(bol) and L_(X)/L_(bol) are linearly related below L_(X)/L_(bol) ~ 3 x 10^(-4), while L_(Halpha)/L_(bol) appears to turn over at larger L_(X)/L_(bol) values. Stars with reliable SDSS photometry have an ~0.1 mag blue excess in (u-g), likely due to increased chromospheric continuum emission. Photometric metallicity estimates suggest the sample is split between the young and old disk populations of the Galaxy; the lowest activity sources belong to the old disk population, a clear signature of the decay of magnetic activity with age. Future papers will present analyses of source variability and comparisons of this catalog to models of stellar activity in the Galactic disk.

arXiv comment21 pages, 12 figures, emulateapj format. Accepted for publication in ApJS. Tables 2 and 3 shown as stubs, and figures degraded to meet resolution limits. Full resolution version available from http://www.cfa.harvard.edu/~kcovey/ChESS.fullres.ps

References in corpus (53)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The USNO-B Catalog
• The Sloan Digital Sky Survey Photometric Camera
• The VizieR database of Astronomical Catalogues
• The u'g'r'i'z' Standard Star Network
• The Sixth Data Release of the Sloan Digital Sky Survey
• The SDSS Quasar Survey: Quasar Luminosity Function from Data Release Three
• The Chandra Deep Field-North Survey. XIII. 2 Ms Point-Source Catalogs
• An Overview of the Performance and Scientific Results from the Chandra X-Ray Observatory (CXO)
• A photometricity and extinction monitor at the Apache Point Observatory
• The Fifth Data Release of the Sloan Digital Sky Survey
• Star counts in the Galaxy. Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
• Constraining the Age-Activity Relation for Cool Stars: The SDSS DR5 Low-Mass Star Spectroscopic Sample
• Northern Sky Variability Survey (NSVS): Public data release
• Deep Extragalactic X-ray Surveys
• SDSS Data Management and Photometric Quality Assessment
• Stellar SEDs from 0.3-2.5 Microns: Tracing the Stellar Locus and Searching for Color Outliers in SDSS and 2MASS
• The Stellar Populations of Praesepe and Coma Berenices
• The first XMM-Newton slew survey catalogue: XMMSL1
• Low-Mass Dwarf Template Spectra from the Sloan Digital Sky Survey
• The Luminosity Function of X-ray Selected Active Galactic Nuclei: Evolution of Supermassive Black Holes at High Redshift
• Analysis of Systematic Effects and Statistical Uncertainties in Angular Clustering of Galaxies from Early SDSS Data
• NEXXUS: A comprehensive ROSAT survey of coronal X-ray emission among nearby solar-like stars
• ROTSE All Sky Surveys for Variable Stars I: Test Fields
• Efficient Photometric Selection of Quasars from the Sloan Digital Sky Survey: 100,000 z<3 Quasars from Data Release One
• Cataclysmic Variables from SDSS II. The Second Year
• The ROSAT Deep Survey: VI. X-ray sources and Optical identifications of the Ultra Deep Survey
• Chandra Multiwavelength Project X-ray Point Source Catalog
• ROSAT-SDSS Galaxy Clusters Survey. I. The Catalog and the correlation of X-ray and optical properties
• Chandra Multi-wavelength Project (ChaMP). I. First X-ray Source Catalog
• Exploring the X-ray Sky with the XMM-Newton Bright Serendipitous Survey
• Chandra Multiwavelength Project X-ray Point Source Number Counts and the Cosmic X-ray Background
• The Hamburg/RASS Catalogue of optical identifications. Northern high-galactic latitude ROSAT Bright Source Catalogue X-ray sources
• X-ray Emission From Nearby M-dwarfs: the Super-saturation Phenomenon
• An Empirical Algorithm for Broad-band Photometric Redshifts of Quasars from the Sloan Digital Sky Survey
• A Large, Uniform Sample of X-ray Emitting AGN from the ROSAT All-Sky and Sloan Digital Sky Surveys: the Data Release 5 Sample
• The Chandra Multiwavelength Project: Optical Followup of Serendipitous Chandra Sources
• The χFactor: Determining the Strength of Activity in Low Mass Dwarfs
• A Second Stellar Color Locus: a Bridge from White Dwarfs to M stars
• Chandra Multi-wavelength Project (ChaMP). II. First Results of X-ray Source Properties
• High speed photometry of faint Cataclysmic Variables: IV. V356 Aql, Aqr1, FIRST J1023+0038, Ha 0242-2802, GI Mon, AO Oct, V972 Oph, SDSS 0155+00, SDSS 0233+00, SDSS 1240-01, SDSS 1556-00, SDSS 2050-05, FH Ser
• Co-moving space density of X-ray-selected Active Galactic Nuclei
• Chandra study of an overdensity of X-ray sources around two distant (z~0.5) clusters
• The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program: I. Characteristics of the Hard X-Ray Sample
• New colour-transformations for the Sloan photometry and revised metallicity calibration and equations for photometric parallax estimation
• SPICES II. Optical and Near-Infrared Identifications of Faint X-Ray Sources from Deep Chandra Observations of Lynx
• ChaMP Serendipitous Galaxy Cluster Survey
• The Chandra Deep Field-North Survey: XVII. Evolution of magnetic activity in old late-type stars
• Coronal stripping in supersaturated stars
• The stellar content of the XMM-Newton Bright Serendipitous Survey
• 172 ks Chandra Exposure of the LALA Boötes Field: X-ray Source Catalog
• Chandra Multiwavelength Project: Normal Galaxies at Intermediate Redshift
• Source Matching in the SDSS and RASS: Which Galaxies are Really X-ray Sources?

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• The Sloan Digital Sky Survey Data Release 7 Spectroscopic M Dwarf Catalog I: Data
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