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J/PASP/114/656      Stellar variability in field stars       (Everett+, 2002)

Stellar variability in a survey of field stars. Everett M.E., Howell S.B., van Belle G.T., Ciardi D.R. <Publ. Astron. Soc. Pac. 114, 656 (2002)> =2002PASP..114..656E
ADC_Keywords: Stars, variable ; Photometry, UBVRI Abstract: We present results from a 5 night wide-field time-series photometric survey that detects variable field stars. We find that the fraction of stars whose light curves show variations depends on color and magnitude, reaching 17% for the brightest stars in this survey (V∼4) for which the photometric precision is best. The fraction of stars found to be variable is relatively high at colors bluer than the Sun and relatively low at colors similar to the Sun and increases again for stars redder than the Sun. We present light curves for a sample of the pulsating and eclipsing variables. Most of the stars identified as pulsating variables have low amplitudes (ΔV=0.01-0.05), relatively blue colors, and multiple periods. There are 13 stars we identify as either SX Phoenicis or δ Scuti stars. These classes represent a significant contribution to the total number of blue variables found in this survey. Another 17 stars are identified as eclipsing variables, which have a wide range in color, magnitude, and amplitude. Two variable giants are observed, and both show night-to-night ∼1% variations. We present data for 222 variables in total, most of which are not classified. Implications of surveys for stellar variability and interferometry are briefly discussed. On 2000 March 16-20 UT we observed a time series of images in V and one or two images each in UBRI toward two 59'x59' fields using the NOAO Mosaic Camera at the Kitt Peak 0.9 m telescope. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 92 222 Variable stars
Table 1: Survey fields ---------------------------------------------------------------------- Field RA (2000) DE GLON GLAT Number of observations ---------------------------------------------------------------------- 1 06 06 00 +45 40 00 167 +12 200 2 14 09 30 +53 20 00 99 +60 250 Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- [EHV2002] Identification number (F-N-NNNN) 10- 11 I2 h RAh Right ascension (J2000.0) 13- 14 I2 min RAm Right ascension (J2000.0) 16- 19 F4.1 s RAs Right ascension (J2000.0) 21 A1 --- DE- Declination sign (J2000.0) 22- 23 I2 deg DEd Declination (J2000.0) 25- 26 I2 arcmin DEm Declination (J2000.0) 28- 29 I2 arcsec DEs Declination (J2000.0) 31- 34 F4.1 mag Vmag V magnitude (1) 36- 39 F4.1 mag U-B ? U-B colour index (1) 41- 44 F4.1 mag B-V ? B-V colour index (1) 46- 48 F3.1 mag V-R ? V-R colour index (1) 50- 52 F3.1 mag B-I ? B-I colour index (1) 54- 56 F3.1 mag V-I ? V-I colour index (1) 58- 75 A18 --- Class Classification based on light curve (2) 77 A1 --- Note [*] *: star with light curve presented in this paper (see electronic version)
Note (1): Filters: -------------------------------- Filter Central waves FHWM -------------------------------- U 3577Å 646Å B 4360Å 990Å V 5370Å 940Å R 6440Å 1510Å I 8220Å 1930Å -------------------------------- Note (2): Classification: EA: EA eclipsing binary EW: EW eclipsing binary RRab: RRab variable SX Phe/delta Scuti: SX Phoenicis or delta Scuti stars U: unclassified variables
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 24-Sep-2002
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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