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J/A+A/467/229       UBV photometry of FK Com and HD 199178        (Panov+, 2007)

Long-term photometric study of FK Comae and HD 199178. Panov K., Dimitrov D. <Astron. Astrophys. 467, 229 (2007)> =2007A&A...467..229P
ADC_Keywords: Stars, variable ; Photometry, UBV Keywords: stars: activity - stars: individual: FK Comae Berenices - stars: individual: HD 199178 - stars: starspots Abstract: The rapidly rotating active stars FK Com and HD 199178 are investigated using extensive long-term photometry. The data set includes previously unpublished photometry, obtained at the Rozhen National Astronomical Observatory. We look for periodicities in the long-term photometric behaviour of both stars, as well as for spots, using light curve modelling. Special attention is paid to the behaviour of the "flip-flop" phenomenon. Description: We report previously unpublished photometric observations of FK Com (1990-2005) and HD 199178 (1991-2004). The observations have been carried out with the 60cm telescope of the Rozhen National Astronomical Observatory (Bulgaria). Observations contain measurements in the Johnson U,B and V bands. The observations are differential. For FK Com, the differential photometry is with respect to HD 117567. For HD 199178, the differential photometry is with respect to HD 199206. Table 2a,b contains a summary of subsets for FK Com and HD 199178, respectively. Table 3a,b contains UBV data for FK Com and HD 199178, respectively, obtained at Rozhen Observatory. Missing data are substituted with 99.000. Table 5a,b contains results of light-curve modelling for FK Com and HD 199178, respectively. Objects: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 13 30 46.8 +24 13 58 FK Com = HD 117555 13 30 52.2 +24 14 15 HD 117567 = HIP 65921 20 53 53.7 +44 23 11 V1794 Cyg = HD 199178 20 54 05.9 +45 06 37 HD 199206 = HIP 103167 -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2a.dat 30 120 Summary of subsets for FK Com table2b.dat 30 169 Summary of subsets for HD 199178 table3a.dat 55 547 *UBV data for FK Com table3b.dat 55 242 *UBV data for HD 199178 table5a.dat 113 162 The results of the modelling for FK Com table5b.dat 113 148 The results of the modelling for HD 199178
Note on table3a.dat, table3b.dat: Observations obtained at Rozhen Observatory
See also: J/A+A/278/449 : Long-term photometry of FK Com (Jetsu+ 1993) J/A+A/282/L9 : "flip-flop" in FK Com (Jetsu+ 1994) J/A+AS/103/183 : UVBRI photometry of FK Com (Jetsu+ 1994) J/A+A/351/212 : V1794 UBVR time series (Jetsu+, 1999) J/A+AS/139/513 : 1975-1995 V1794 Cyg UBVRI photometry (Jetsu+, 1999) J/A+A/374/1049 : Photometry of FK Com for 1993-2001 (Korhonen+, 2001) J/A+A/390/179 : Study of FK Comae Berenices. IV. (Korhonen+ 2002) Byte-by-byte Description of file: table2a.dat table2b.dat
Bytes Format Units Label Explanations
1- 3 I3 --- SET Subset number (1) 5- 15 F11.3 d JD1 Julian Date of subset beginning 17- 27 F11.3 d JD2 Julian Date of subset end 30 I1 --- Ref [1/9] Reference (2)
Note (1): In table2a, Subset 1-57 from Jetsu et al. (1994a) Note (2): References as follows: 1 = Jetsu et al. (1994, Cat. J/A+AS/103/183) 2 = Jetsu et al. (1994, Cat. J/A+A/282/L9 3 = Heckert (1993IBVS.3954....1H) 4 = Strassmeier et al. (1997, Cat. J/A+AS/125/11) 5 = Korhonen et al. (2001, Cat. J/A+A/374/1049) 6 = Korhonen et al. (2002, Cat. J/A+A/390/179) 7 = Rozhen observations 8 = Jetsu et al. (1999, Cat. J/A+AS/139/513) 9 = Strassmeier et al. (1999A&A...347..212S)
Byte-by-byte Description of file: table3a.dat table3b.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d JD Julian Date 15- 20 F6.3 mag Vmag ?=99.0 V magnitude in Johnson system 22- 27 F6.3 mag Bmag ?=99.0 B magnitude in Johnson system 29- 34 F6.3 mag Umag ?=99.0 U magnitude in Johnson system 36- 41 F6.3 mag e_Vmag ?=99.0 error in Vmag 43- 48 F6.3 mag e_Bmag ?=99.0 error in Bmag 50- 55 F6.3 mag e_Umag ?=99.0 error in Umag
Byte-by-byte Description of file: table5a.dat table5b.dat
Bytes Format Units Label Explanations
1- 3 I3 --- SET Subset number 5- 11 F7.2 yr Year Average observing time 13- 17 F5.3 mag Vmin Minimum brightness in V 19- 23 F5.3 mag Vmax Maximum brightness in V 25- 29 F5.3 mag Vmean Mean brightness in V 31- 35 F5.3 mag AVmag Amplitude of rotational modulation in V 37- 47 F11.3 d JDmin Julian date of minimum brightness 49- 52 F4.2 --- Phase Phase of minimum brightness 54- 58 F5.1 deg Long1 Longitude of Spot1 60- 64 F5.1 deg Lat1 Latitude of Spot1 66- 70 F5.1 deg Size1 Size of Spot1 72- 76 F5.1 deg Long2 Longitude of Spot2 78- 82 F5.1 deg Lat2 Latitude of Spot2 84- 88 F5.1 deg Size2 Size of Spot2 90- 94 F5.1 deg Long3 Longitude of Spot3 96-100 F5.1 deg Lat3 Latitude of Spot3 102-106 F5.1 deg Size3 Size of Spot3 108-113 F6.4 --- Sigma Standard deviation of residuals
Acknowledgements: Kiril Panov, kpanov(at)libra.astro.bas.bg
(End) Kiril Panov [Inst. Astronomy, Sofia], Patricia Vannier [CDS] 17-Mar-2007
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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