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J/ApJ/701/535        A sample of candidate radio stars          (Kimball+, 2009)

A sample of candidate radio stars in FIRST and SDSS. Kimball A.E., Knapp G.R., Ivezic Z., West A.A., Bochanski J.J., Plotkin R.M., Gordon M.S. <Astrophys. J., 701, 535-546 (2009)> =2009ApJ...701..535K
ADC_Keywords: Stars, radio ; Surveys ; Photometry, SDSS Keywords: radio continuum: stars - stars: statistics - surveys Abstract: We conduct a search for radio stars by combining radio and optical data from the FIRST survey (Cat. VIII/71) and the Sloan Digital Sky Survey (SDSS-DR6, Cat. II/282, obsoleted by II/294). The faint limit of SDSS makes possible a homogeneous search for radio emission from stars of low optical luminosity. We select a sample of 112 candidate radio stars in the magnitude range 15<i≲19.1 and with radio flux S20≥1.25mJy, from about 7000deg2 of sky. The selection criteria are positional coincidence within 1", radio and optical point source morphology, and an SDSS spectrum classified as stellar. The sample contamination is estimated by random matching to be 108±13, suggesting that at most a small fraction of the selected candidates are genuine radio stars. Therefore, we rule out a very rare population of extremely radio-loud stars: no more than 1.2 of every million stars in the magnitude range 15<i<19.1 stars has radio flux S20≥1.25mJy. We investigate the optical and radio colors of the sample to find candidates that show the largest likelihood of being real radio stars. The significant outliers from the stellar locus, as well as the magnetically active stars, are the best candidates for follow-up radio observations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 118 112 Properties of the radio star candidates sample table2.dat 118 16 Candidate radio stars with resolved radio emission table3.dat 118 60 Candidate radio stars with complex radio emission
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003) II/199 : Radio continuum emission from stars (Wendker, 1995) V/67 : An astrometric catalogue of radio stars (Hering+ 1990) J/A+A/281/161 : Radio emission from stars at 250GHz (Altenhoff+, 1994) : SDSS home page : Evolutionary Map of the Universe project Byte-by-byte Description of file: table[123].dat
Bytes Format Units Label Explanations
1- 11 F11.7 deg RAdeg SDSS Right Ascension in decimal degrees (J2000) 13- 24 F12.8 deg DEdeg SDSS Declination in decimal degrees (J2000) 26- 34 F9.5 deg RAFdeg FIRST Right Ascension in decimal degrees (J2000) 36- 44 F9.5 deg DEFdeg FIRST Declination in decimal degrees (J2000) 46- 49 F4.2 arcsec Sep Separation between SDSS and FIRST positions 51- 60 F10.3 pc Dist Heliocentric distance (1) 62- 63 A2 --- Sp Visually-confirmed MK spectral type 65 A1 --- Ha? [ynm] Spectrum with reliable Hα emission? (y=yes, n=no, m=maybe) 68- 73 F6.2 mJy Speak FIRST peak 20cm flux density in mJy/beam 75- 80 F6.2 mJy Sint FIRST integrated 20cm flux density 82- 85 F4.1 mag umag SDSS u band model magnitude 87- 90 F4.1 mag gmag SDSS g band model magnitude 92- 95 F4.1 mag rmag SDSS r band model magnitude 97-100 F4.1 mag imag SDSS i band model magnitude 102-105 F4.1 mag zmag SDSS z band model magnitude 107-110 F4.1 --- 4DCD Four-dimensional color distance (3) 112-118 I7 --- [KI2008] Internal identification number (4)
Note (1): Determined using the photometric parallax relation of Ivezic et al. (2008ApJ...684..287I); the relation is valid only for stars on the main sequence. Note (3): describes the statistical significance of the distance in color space between a target object and the point on the stellar locus with the same g–i color as the target; outliers have 4DCD>2, extreme outliers 4DCD>3. See Section 4.1 of the paper for more details. Note (4): From the radio catalog of Kimball & Ivezic (2008AJ....136..684K).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Sep-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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