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J/AJ/141/166   HATNet variability survey of K and M dwarfs      (Hartman+, 2011)

A photometric variability survey of field K and M dwarfs with HATNet. Hartman J.D., Bakos G.A., Noyes R.W., Sipocz B., Kovacs G., Mazeh T., Shporer A., Pal A. <Astron. J. 141, 166 (2011)> =2011AJ....141..166H
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Stars, flare ; Stars, K-type ; Stars, M-type Keywords: binaries: eclipsing - stars: fundamental parameters - stars: late-type - stars: low-mass - stars: rotation - techniques: photometric Abstract: Using light curves from the HATNet survey for transiting extrasolar planets we investigate the optical broad-band photometric variability of a sample of 27, 560 field K and M dwarfs selected by color and proper-motion (V-K≳3.0, mu>30mas/yr, plus additional cuts in J-H vs. H-Ks and on the reduced proper motion). We apply a variety of variability selection algorithms on the light curves to search for periodic and quasi-periodic variations, and for large-amplitude, long-duration flare events. To set the selection thresholds we conduct Monte Carlo simulations of light curves with realistic noise properties. Description: The survey was conducted using the Hungarian-made Automated Telescope Network (HATNet) of small aperture robotic telescopes located in Arizona and Hawaii. The AoV, AoVHarm (AH), BLS and DACF algorithms were used to search for periodic variable stars, a total of 3418 candidate variables are included in the primary catalog. A separate search for flare events was conducted. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file vars.dat 196 2033 Catalog of periodic variables (table6) eb.dat 175 95 Catalog of eclipsing binaries (table7) flares.dat 124 64 Catalog of large amplitude flare events (table8) cross.dat 48 62 Cross-matches to other variable star catalogs (table2) xray.dat 45 237 Cross-matches to ROSAT X-ray sources (table3)
See also: IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000) I/259 : The Tycho-2 Catalogue (Hog+ 2000) I/284 : The USNO-B1.0 Catalog (Monet+ 2003) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/312 : PPMX Catalog of positions and proper motions (Roeser+ 2008) Byte-by-byte Description of file: vars.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [HAT-] 5- 15 A11 --- HAT HAT designation (FFF-NNNNNNN) 17- 18 I2 h RAh 2MASS Right Ascension J2000 (hours) 20- 21 I2 min RAm 2MASS Right Ascension J2000 (minutes) 23- 27 F5.2 s RAs 2MASS Right Ascension J2000 (seconds) 29 A1 --- DE- 2MASS Declination J2000 (sign) 30- 31 I2 deg DEd 2MASS Declination J2000 (degrees) 33- 34 I2 arcmin DEm 2MASS Declination J2000 (minutes) 36- 39 F4.1 arcsec DEs 2MASS Declination J2000 (seconds) 41- 48 F8.2 mas/yr pmRA PPMX Proper motion in Right Ascension 50- 57 F8.2 mas/yr pmDE PPMX Proper motion in Declination 59- 65 F7.3 mag Jmag 2MASS J apparent magnitude 67- 73 F7.3 mag Hmag 2MASS H apparent magnitude 75- 81 F7.3 mag Kmag 2MASS Ks apparent magnitude 83- 89 F7.3 mag Vmag Magnitude (apparent) in V filter 91 I1 --- r_Vmag [0/2] Source for Vmag (G1) 93-102 F10.6 d Pe ?=-99.99 Period from AH applied to the EPD light curves (1) 104-110 F7.2 --- SNe ?=-999.99 S/N from AH applied to the EPD light curves (1) 112-117 F6.3 mag dI.e1 ?=-9.999 I Amplitude of EPD lc phased at Pe (2) 119-124 F6.3 mag dR.e1 ?=-9.999 R Amplitude of EPD lc phased at Pe (2) 126-131 F6.3 mag dI.e2 ?=-9.999 I Amplitude of TFA lc phased at Pe (2) 133-138 F6.3 mag dR.e2 ?=-9.999 R Amplitude of TFA lc phased at Pe (2) 140 I1 --- Qe [0/2] Quality flag for AH/EPD (3) 142-151 F10.6 d Pt ?=-99.99 Period from AH applied to the TFA light curves (1) 153-159 F7.2 --- SNt ?=-999.99 S/N from AH applied to the TFA light curves (1) 161-166 F6.3 mag dI.t1 ?=-9.999 I Amplitude of EPD lc phased at Pt (2) 168-173 F6.3 mag dR.t1 ?=-9.999 R Amplitude of EPD lc phased at Pt (2) 175-180 F6.3 mag dI.t2 ?=-9.999 I Amplitude of TFA lc phased at Pt (2) 182-187 F6.3 mag dR.t2 ?=-9.999 R Amplitude of TFA lc phased at Pt (2) 189 I1 --- Qt [0/2] Quality flag for AH/TFA, 0=ok (3) 191-192 I2 --- N Number of other 2MASS sources within 30" of the source 194 I1 --- Bl1 [0/3] Blending flag from 2MASS stars (G2) 196 I1 --- Bl2 [0/9] Blending flag from SDSS stars (G2)
Note (1): AH, EPD and TFA definitions: AH = the Analysis of Variance period-finder using a harmonic series. EPD = light curves have had External Parameter Decorrelation applied to remove trends that correlate with hour angle, star position, etc., but have not had additional trend filtering applied. TFA = light curves have had both EPD and the Trend Filtering Algorithm applied. Note that TFA light curves will generally have fewer false alarm detections, but the measured amplitude of a real signal may be systematically lower than for the EPD light curves. Note (2): Note that an amplitude may be undefined even if a period was detected if the EPD or TFA light curve in the I or R band is unavailable for the target, or if the amplitude finding routine failed to converge. Amplitudes are peak-to-peak. Note (3): Quality flag as follows: 0 = ok. The distinction between an ok detection and a questionable detection is subjective. 1 = questionable detection. The distinction between an ok detection and a questionable detection is subjective. 2 = no detection
Byte-by-byte Description of file: eb.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [HAT-] 5- 15 A11 --- HAT HAT designation (FFF-NNNNNNN) 17- 18 I2 h RAh 2MASS Right Ascension J2000 (hours) 20- 21 I2 min RAm 2MASS Right Ascension J2000 (minutes) 23- 27 F5.2 s RAs 2MASS Right Ascension J2000 (seconds) 29 A1 --- DE- 2MASS Declination J2000 (sign) 30- 31 I2 deg DEd 2MASS Declination J2000 (degrees) 33- 34 I2 arcmin DEm 2MASS Declination J2000 (minutes) 36- 39 F4.1 arcsec DEs 2MASS Declination J2000 (seconds) 41- 48 F8.2 mas/yr pmRA PPMX Proper motion in Right Ascension 50- 57 F8.2 mas/yr pmDE PPMX Proper motion in Declination 59- 65 F7.3 mag Jmag 2MASS J apparent magnitude 67- 73 F7.3 mag Hmag 2MASS H apparent magnitude 75- 81 F7.3 mag Kmag 2MASS Ks apparent magnitude 83- 89 F7.3 mag Vmag V apparent magnitude 91 I1 --- r_Vmag [0/2] Source for Vmag (G1) 93-102 F10.7 d Per Period 104-113 F10.7 d e_Per Period uncertainty 115-127 F13.5 d HJD01 Epoch of primary eclipse 129-135 F7.5 d e_HJD01 Epoch of primary eclipse uncertainty 137-141 F5.2 h Dt1 Duration of primary eclipse 143-155 F13.5 d HJD02 ?=99.99 Epoch of secondary eclipse (2) 157-163 F7.5 d e_HJD02 ?=9.99 Epoch of secondary eclipse uncertainty 165-169 F5.2 h Dt2 ?=9.99 Duration of secondary eclipse 171 I1 --- N Number of other 2MASS sources within 30" of the source 173 I1 --- Bl1 [0/3] Blending flag from 2MASS stars (G2) 175 I1 --- Bl2 [0/9] Blending flag from SDSS stars (G2)
Note (2): In cases where HJD0s, e_HJD0s and DURs are undefined a secondary eclipse was not detected in the light curve.
Byte-by-byte Description of file: flares.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [HAT-] 5- 15 A11 --- HAT HAT designation (FFF-NNNNNNN) 17- 18 I2 h RAh 2MASS Right Ascension J2000 (hours) 20- 21 I2 min RAm 2MASS Right Ascension J2000 (minutes) 23- 27 F5.2 s RAs 2MASS Right Ascension J2000 (seconds) 29 A1 --- DE- 2MASS Declination J2000 (sign) 30- 31 I2 deg DEd 2MASS Declination J2000 (degrees) 33- 34 I2 arcmin DEm 2MASS Declination J2000 (minutes) 36- 39 F4.1 arcsec DEs 2MASS Declination J2000 (seconds) 41- 48 F8.2 mas/yr pmRA PPMX Proper motion in Right Ascension 50- 57 F8.2 mas/yr pmDE PPMX Proper motion in Declination 59- 65 F7.3 mag Jmag 2MASS J apparent magnitude 67- 73 F7.3 mag Hmag 2MASS H apparent magnitude 75- 81 F7.3 mag Kmag 2MASS Ks apparent magnitude 83- 89 F7.3 mag Vmag Magnitude (apparent) in V filter 91 I1 --- r_Vmag [0/2] Source for Vmag (G1) 93-105 F13.5 d HJD Time of flare peak 107-112 F6.3 --- amp Peak intensity relative to the photosphere 114-119 F6.4 d tau 1/e decay time of the flare τ 121-124 I4 --- Nobs Number of observations included in fitting the flare
Byte-by-byte Description of file: cross.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [HAT-] 5- 15 A11 --- HAT HAT designation (FFF-NNNNNNN) 17- 42 A26 --- AltID Alternate ID 44 I1 --- MFlag [0/1] Match flag (0=ok) (1) 46 I1 --- Bl1 [0/4] Blending flag from 2MASS stars (G2) 48 I1 --- Bl2 [0/9] Blending flag from SDSS stars (G2)
Note (1): Match flag as follows: 0 = match is correct 1 = match is incorrect, the two distinct sources may be blended on the HATNet images. A match is labeled incorrect if the two objects are different sources.
Byte-by-byte Description of file: xray.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [HAT-] 5- 15 A11 --- HAT HAT designation (FFF-NNNNNNN) 17- 20 A4 --- --- [1RXS] 22- 37 A16 --- 1RXS ID of matching ROSAT source (JHHMMSS.s+DDMMSS) Cat. IX/29 39- 45 F7.4 [-] lgFX/FJ Estimated log(FX/FJ) (ratio of X-ray flux to J-band flux) (1)
Note (1): Calculated using relation from Agueros et al. 2009 (Cat. J/ApJS/181/444).
Global notes: Note (G1): Source for Vmag as follows: 0 = PPMX, Cat. I/312 (Tycho-2, Cat. I/259) 1 = Transformed from USNO-B1.0, Cat. I/284 2 = Transformed from 2MASS, Cat. II/246 Note (G2): Blending flag as follows: 0 = unblended 1 = unlikely blend 2 = possible blend 3 = probable blend. If a star is flagged as a probable blend, there is a good chance that the real variable is a neighboring star. 4 = star is only identified as a flare star, no blending info available 9 = No SDSS match
Acknowledgements: Joel Hartman, jhartman(at)cfa.harvard.edu
(End) Joel Hartman [CfA], Patricia Vannier [CDS] 03-Feb-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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