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J/A+A/362/223       1984-1998 BV photometry of V815 Her        (Jetsu+, 2000)

Time series analysis of V815 Herculis photometry between 1984 and 1998 Jetsu L., Hackman T., Hall D.S., Henry G.W., Kokko M., You J. <Astron. Astrophys. 362, 223 (2000)> =2000A&A...362..223J
ADC_Keywords: Stars, variable ; Photometry, UBV Keywords: stars: individual: V815 Her - stars: variables: general - stars: activity - techniques: photometric Abstract: As a case study of the solar-stellar connection, we have analysed a prolonged time series of BV photometry of the chromospherically active binary V815 Her. The surface differential rotation in the rapidly rotating G5V primary caused changes of 4.6% in the seasonal photometric rotation periods. This would imply a differential rotation coefficient of k=0.184, if the rotation of the starspots follow the solar law of differential rotation and the activity is confined within the same latitudinal range as in the Sun, having k=0.189 and the spectral type G2V. Our analysis of the primary and secondary minima of the seasonal light curves indicated that the regions of stronger activity have concentrated on one active longitude, which has maintained a constant rotation period of 1.79244d for about 14 years. No regular activity cycle was detected in the mean brightness changes of V815 Her. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 18 08 16.0 +29 41 28 V815 Her = HD 166181 18 07 52.0 +29 49 05 HD 166093 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 29 1458 V and B V815 Her differential magnitudes
See also: J/A+A/350/513 : V368 Cep UBVRI time series (Kahanpaa+, 1999) J/A+AS/139/513 : 1975-1995 V1794 Cyg UBVRI photometry (Jetsu+, 1999) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- SET Subset number ( a total of 98 subsets) 4- 15 F12.4 d HJD Heliocentric Julian date 17- 22 F6.3 mag Bmag ?=99.999 V815 Her minus HD 166093 magnitude difference in the standard Johnson B system 24- 29 F6.3 mag Vmag ?=99.999 V815 Her minus HD 166093 magnitude difference in the standard Johnson V system
Acknowledgements: Lauri Jetsu
(End) Patricia Bauer [CDS] 24-Oct-2000
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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