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J/A+A/515/A81    TYC 2627-638-1 BV(RI)c differential photometry    (Olah+, 2010)

Young solar type active stars: the TYC 2627-638-1 system. Olah K., Korhonen H., Vida K., Ilyin I., Dall T.H., Jarvinen S.P., Jurcsik J., Andersen M.I., Djupvik A.A., Pursimo T., Moor A., Datson J., Karjalainen R., Liimets T., Kubat J., Kawka A. <Astron. Astrophys. 515, A81 (2010)> =2010A&A...515A..81O
ADC_Keywords: Stars, double and multiple ; Stars, G-type ; Photometry, UBVRI ; Photometry, Cousins Keywords: stars: activity - stars: atmospheres - stars: late-type - starspots Abstract: We present BV(RI)c and JHKs photometry and low- and high-resolution spectroscopy of the 11th mag G-type star TYC 2627-638-1. Our investigation reveals that the target is separated into two young, early-G-type main-sequence (or late pre-main-sequence) stars, which are most probably bound and form a wide binary system. A substellar body orbits the brighter component as implied by radial velocity variations. The brighter component possibly also has a faint, later type stellar companion. Both components of the wide binary have clear emission cores in the CaII H&K lines and filled-in Halpha absorption, indicating that both stars are chromospherically active. Our photometric time series reveals clear but only a few hundredths of a magnitude amplitude rotational modulation, which is most likely due to cool starspots. Two distinct periods, near 3.5 and 3.7-days, are found in the brightness variations. Photometry obtained separately of the two components of the wide binary show that these periodicities belong to the brighter star. The fainter component shows a much slower light variation of about 0.3mag. amplitude. In addition, long-term changes in the brightness of both stars are seen. The spectral energy distribution shows a strong near-infrared excess in the fainter component of the wide binary. Description: We present altogether 7100 B, V, Ic and 2391 Rc observations, all interpolated to the time of the V-magnitude, obtained in 2006-2009 with the automated 60cm telescope (1) in Budapest and with the 1m RCC telescope (2) in Piszkesteto mountain station of Konkoly Observatory, with CCD cameras and BV(RI)c filters. The data are given as delta magnitudes with respect to the main comparison star C0 (V=11.841, B-V=0.582, V-Rc=0.315, V-Ic=0.666, Jurcsik et al., 2008, Cat. <J/MNRAS/391/164). The data are transformed to the international system through Landolt standard sequences. Objects: ------------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------------- 18 20 05.4 +31 57 44 TYC 2627-638-1 = 2MASS J18200537+3157444 ------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ab-bvi.dat 40 4906 BVIc magnitudes of TYC 2627-638-1 (A+B components together), with the 60cm telescope ab-r.dat 40 197 Rc magnitudes of TYC 2627-638-1 (A+B components together), with the 60cm telescope ab-bvri.dat 40 2194 BV(RI)c magnitudes of TYC 2627-638-1 (A+B components together), with the 1m telescope a-bvri.dat 40 300 BV(RI)c magnitudes of TYC 2627-638-1A component separately, with the 1m telescope b-bvri.dat 40 325 BV(RI)c magnitudes of TYC 2627-638-1B component separately, with the 1m telescope
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) J/MNRAS/391/164 : MW Lyr BV(RI)c light curves (Jurcsik+, 2008) Byte-by-byte Description of file: *.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian date 14- 19 F6.3 mag DBmag ? Differential Johnson B magnitude 21- 26 F6.3 mag DVmag ? Differential Johnson B magnitude 28- 33 F6.3 mag DRcmag ? Differential Cousins R magnitude 35- 40 F6.3 mag DIcmag ? Differential Cousins I magnitude
Acknowledgements: Katalin Olah, olah(at)
(End) Patricia Vannier [CDS] 10-Apr-2010
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