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 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includes previously unpublished photometry, obtained at the Rozhen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We report previously unpublished photometric observations of FK Com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:
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RA (2000) DE Designation(s)
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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
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File Summary:
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FileName Lrecl Records Explanations
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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
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Note on table3a.dat, table3b.dat: Observations obtained at Rozhen Observatory
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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
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Bytes Format Units Label Explanations
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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)
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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 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 1999A&A...347..212S)
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Byte-by-byte Description of file: table3a.dat table3b.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table5a.dat table5b.dat
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Bytes Format Units Label Explanations
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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
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Acknowledgements:
Kiril Panov, kpanov(at)libra.astro.bas.bg
(End) Kiril Panov [Inst. Astronomy, Sofia], Patricia Vannier [CDS] 17-Mar-2007