J/A+A/400/659 UBV(RI)c photometry of active stars. X. (Cutispoto+, 2003)
Long-term monitoring of active stars. X. Photometry collected in 1994.
Cutispoto G., Messina S., Rodono M.
<Astron. Astrophys. 400, 659 (2003)>
=2003A&A...400..659C 2003A&A...400..659C
ADC_Keywords: Stars, variable ; Photometry, UBVRI ; Photometry, Cousins ;
Stars, flare
Keywords: stars: activity - stars: late-type - stars: pre-main sequence -
stars: variables: general - X-ray stars
Abstract:
As part of an extensive program focused on the global properties and
evolution of active stars, high-precision UBV(RI)c and UBV photometry
of 18 selected stars is presented. UBV(RI)c observations were
collected at the European Southern Observatory over the intervals 21-28
September 1994 and 25 November - 05 December 1994. Additional UBV
photometry obtained late in 1994 by Catania Astrophysical Observatory
Automatic Photoelectric Telescope is also presented. Significant
evolution of the light curves, period variations and evidence for
long-term variability of the global degree of spottedness are found.
Some spectral classifications are revised and photometric parallaxes
are compared, whenever possible, with the values measured by the
Hipparcos satellite. These observations are finalized to the
construction of an extended photometric database, which can give
important clues on topics such as the stability of spotted areas,
differential stellar rotation, solar-like activity cycles and the
correlation between inhomogeneities at different atmospheric levels.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
position.dat 80 57 Star positions from Simbad
table1.dat 79 19 Summary of photometric observations
table3.dat 91 18 Summary of stellar data
table4.dat 37 36 V-band magnitude and colors obtained for the
comparison (c) and check (ck) stars
obtained at ESO
tables.tex 80 169 LaTex version of tables 1-4
ubvri.dat 71 264 UBV(RI)c data obtained at La Silla observatory
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See also:
J/A+AS/119/281 : Long-term monitoring of active stars. V. (Cutispoto, 1996)
J/A+AS/121/369 : Long-term monitoring of active stars. VI. (Cutispoto, 1997)
J/A+AS/127/207 : Long-term monitoring of active stars. VII. (Cutispoto 1998)
J/A+AS/131/321 : Long-term monitoring of active stars. VIII. (Cutispoto 1998)
J/A+A/367/910 : Long-term monitoring of active stars. IX. (Cutispoto+, 2001)
Byte-by-byte Description of file: position.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Star names (program, comparison and check)
16- 17 I2 h RAh Right ascension (J2000.0)
19- 20 I2 min RAm Right ascension (J2000.0)
22- 25 F4.1 s RAs Right ascension (J2000.0)
27 A1 --- DE- Declination sign (J2000.0)
28- 29 I2 deg DEd Declination (J2000.0)
31- 32 I2 arcmin DEm Declination (J2000.0)
34- 35 I2 arcsec DEs Declination (J2000.0)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Program star name (v)
12- 28 A17 --- OName Other name of program star
30- 36 F7.2 yr Epoch Mean epoch of observations
38- 47 A10 --- Comp Comparison star (c)
49- 58 A10 --- Check Check star (ck)
61- 62 I2 mmag v-c Standard deviation for the v-c
V-band differential magnitude
64 I1 mmag ck-c Standard deviation for the ck-c
V-band differential magnitude
66- 67 I2 --- Nights Number of nights
69- 71 F3.2 mag DeltaV Peak-to-peak amplitude of the V-band
light curve
73- 79 F7.5 d Per ? Period of variability
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Table 2: Mean atmospheric extinction coefficients for La Silla site, obtained
over the intervals 21-28 September 1994 (1994.73) and
25 November - 05 December 1994 (1994.92)
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Epoch U B V R I
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mag/airmass 1994.73 .433 .210 .121 .074 .042
mag/airmass 1994.92 .439 .213 .129 .090 .049
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Program star name
12- 18 F7.2 yr Epoch Mean epoch of observations
20- 24 F5.2 mag Vmag V-band maximum luminosity
26- 29 F4.2 mag U-B U-B colour index at maximum luminosity
31- 34 F4.2 mag B-V B-V colour index at maximum luminosity
36- 39 F4.2 mag V-R Cousins V-R colour index at maximum luminosity
41- 44 F4.2 mag V-I Cousins V-I colour index at maximum luminosity
46- 52 F7.5 d Per ? Period of variability
54- 70 A17 --- SpType Inferred Spectral type
72 A1 --- l_DH Limit flag on DH
73- 77 F5.1 pc DH ? Distance measured by the Hipparcos satellite
78 A1 --- u_DH Uncertainty flag on DH
80- 84 F5.1 pc dph Photometric distance inferred from the
spectral classification
85 A1 --- u_dph Uncertainty flag on dph
87- 91 F5.2 mag Vmax V-band maximum luminosity ever observed
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Comparison or check star name
12- 16 F5.2 mag Vmag V magnitude
18- 21 F4.2 mag U-B U-B colour index (1)
22 A1 --- u_U-B Uncertainty flag on U-B (1)
24- 27 F4.2 mag B-V B-V colour index (1)
29- 32 F4.2 mag V-R Cousins V-R colour index (1)
34- 37 F4.2 mag V-I Cousins V-I colour index (1)
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Note (1): Errors are of the order of 0.01 magnitudes. The symbol ":"
denotes errors of the order of 0.02 magnitudes; the epochs of observation
are given in Table1
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Byte-by-byte Description of file: ubvri.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Star Star name
12- 23 F12.4 d HJD Heliocentric Julian Day
27- 31 F5.4 --- Phase [0/1] Phase (2)
34- 39 F6.3 mag Vmag V-band magnitude
43- 47 F5.3 mag U-B ?=9.999 U-B colour index
51- 55 F5.3 mag B-V ?=9.999 B-V colour index
59- 63 F5.3 mag V-R ?=9.999 V-Rc colour index (1)
67- 71 F5.3 mag V-I ?=9.999 V-Ic colour index (1)
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Note (1): Lines for which both V-R and V-I are 9.999 refer to data obtained
by the Catania automatic telescopes
Note (2): Phases have been computed by using the following ephemeris:
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HD 7172 JDo=2449681.5 + 3.15 x E
BI Cet JDo=2449577.5 + 0.520 x E
BC Phe JDo=2449681.5 + 0.657 x E
BG Psc JDo=2449681.5 + 7.60 x E
CC Eri JDo=2449681.5 + 1.56145 x E
BY Cet JDo=2449681.5 + 2.60 x E
ES Eri JDo=2449681.5 + 4.7 x E
YY Men JDo=2449681.5 + 9.5476 x E
UX Col JDo=2449681.5 + 2.21 x E
AB Dor JDo=2449681.5 + 0.51423 x E
V1321 Ori JDo=2449681.5 + 5.7 x E
V1355 Ori JDo=2449681.5 + 3.82 x E
HY CMa JDo=2449314.93 + 4.977 x E
V1358 Ori JDo=2449681.5 + 1.16 x E
AU Mic JD0=2441054.0 + 4.865 x E
FK Aqr JD0=2447129.529 + 4.39 x E
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Acknowledgements: Giuseppe Cutispoto
References:
Rodono & Cutispoto, Paper I 1992A&AS...95...55R 1992A&AS...95...55R
Cutispoto Paper II 1992A&AS...95..397C 1992A&AS...95..397C
Cutispoto Paper III 1993A&AS..102..655C 1993A&AS..102..655C
Cutispoto Paper IV 1995A&AS..111..507C 1995A&AS..111..507C
Cutispoto Paper V 1996A&AS..119..281C 1996A&AS..119..281C, Cat. J/A+AS/119/281
Cutispoto & Leto Paper VI 1997A&AS..121..369C 1997A&AS..121..369C, Cat. J/A+AS/121/369
Cutispoto Paper VII 1998A&AS..127..207C 1998A&AS..127..207C, Cat. J/A+AS/127/207
Cutispoto Paper VIII 1998A&AS..131..321C 1998A&AS..131..321C, Cat. J/A+AS/131/321
Cutispoto et al., Paper IX 2001A&A...367..910C 2001A&A...367..910C, Cat. J/A+A/367/910
(End) Patricia Bauer [CDS] 13-Mar-2003