J/A+A/367/910 UBV(RI)c photometry of active stars. IX (Cutispoto+, 2001)
Long-term monitoring of active stars. IX. Photometry collected in 1993.
Cutispoto G., Messina S., Rodono M.
<Astron. Astrophys. 367, 910 (2001)>
=2001A&A...367..910C 2001A&A...367..910C
ADC_Keywords: Stars, variable ; Photometry, UBVRI ; Photometry, Cousins ;
Stars, flare
Keywords: stars: activity - stars: late-type - stars: pre-main sequence -
stars: variables - X-ray: stars
Abstract:
As a part of an extensive program focused on the global properties and
evolution of active stars, high-precision UBV(RI)c and UBV
photometry of 31 selected stars is presented. The UBV(RI)c
observations were collected at the European Southern Observatory over
the 31 December 1992-18 January 1993 and the 20 November-3 December
1993 intervals. Additional UBV photometry obtained by the ``Phoenix"
and by the Catania Astrophysical Observatory Automatic Photoelectric
Telescopes from 1990 to 1993 is also presented for some of the program
stars. 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
the inferred photometric parallaxes are compared, whenever possible,
with the values measured by the Hipparcos satellite (Cat. I/239).
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 rotation, solar-like
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
stars.dat 30 44 Star positions (from Simbad)
ubv.dat 42 329 UBV data obtained by the Catania and Phoenix
automatic telescopes
ubvri.dat 58 388 UBV(RI)c data obtained at La Silla observatory
table1.dat 80 47 V differential magnitudes of program stars
table3.dat 88 46 UBVRI photometry, spectral classification
and distance of program stars
table4.dat 39 65 V magnitude and colours for the c and ck stars
obtained at ESO
table5.dat 92 13 Revised spectral classification, based on the
latest version of the ASC method, for some
active stars previously observed by our group
tables.tex 80 370 LaTeX version of tables 1-5
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See also:
J/A+AS/115/41 : UBV(RI)c photometry of cool stars (Cutispoto+, 1996)
J/A+A/364/205 : UBVy photometry of cool stars (Cutispoto+, 2000)
J/A+AS/119/281 : UBV(RI)c photometry of active stars. V (Cutispoto, 1996)
J/A+AS/121/369 : UBV(RI)c photometry of active stars. VI (Cutispoto, 1997)
J/A+AS/127/207 : UBV(RI)c photometry of active stars. VII (Cutispoto 1998)
J/A+AS/131/321 : UBV(RI)c photometry of active stars. VIII (Cutispoto 1998)
J/A+A/400/659 : UBV(RI)c photometry of active stars. X (Cutispoto+, 2003)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Program star name
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 20 F4.1 s RAs Right ascension (J2000.0)
22 A1 --- DE- Declination sign (J2000.0)
23- 24 I2 deg DEd Declination (J2000.0)
26- 27 I2 arcmin DEm Declination (J2000.0)
29- 30 I2 arcsec DEs Declination (J2000.0)
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Byte-by-byte Description of file: ubv.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name
11- 22 F12.4 d HJD Heliocentric Julian Day
24- 28 F5.3 mag Vmag V-band magnitude
30- 35 F6.3 mag B-V ?=9.000 B-V colour index
37- 42 F6.3 mag U-B ?=9.000 U-B colour index
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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- 9 A9 --- Star Star name
11- 22 F12.4 d HJD Heliocentric Julian Day
24- 29 F6.3 mag Vmag V-band magnitude
31- 36 F6.3 mag U-B ?=9.999 U-B colour index
38- 43 F6.3 mag B-V ?=9.999 B-V colour index
45- 50 F6.3 mag V-R ?=9.999 V-Rc colour index
52- 57 F6.3 mag V-I ?=9.999 V-Ic colour index
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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- 9 A9 --- Star Program star name
11- 23 A13 --- Oname Other name of the star
26- 32 F7.2 yr Epoch Mean epoch of observation
35- 44 A10 --- Comp Comparison star
46- 55 A10 --- Check Check star
57- 58 I2 mmag v-c Standard deviation for the v-c V-band
differential magnitude
60- 61 I2 mmag ck-c Standard deviation for the ck-c V-band
differential magnitude
63- 64 I2 --- Nights Number of nights
66- 69 F4.3 mag DeltaV ? Peak-to-peak amplitude of the V-band
light curve
70- 78 F9.6 yr Per ? Period of variability
80 A1 --- u_Per [?] ?: unknown value of Per
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Table 2: Mean atmospheric extinction coefficients for La Silla site, obtained
over the intervals 31 December 1992 - 18 January 1993 (1993.02) and
20 November - 03 December 1993 (1993.91)
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Epoch U B V R I
mag/airmass 1993.02 .522 .294 .203 .163 .117
mag/airmass 1993.91 .429 .210 .128 .088 .058
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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- 9 A9 --- Star Program star name
11- 17 F7.2 yr Epoch Mean epoch of observation
19- 23 F5.2 mag Vmag V magnitude at 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 ? V-Rc colour index at maximum luminosity
41- 44 F4.2 mag V-I ? V-Ic colour index at maximum luminosity
46- 66 A21 --- SpType Inferred spectral classification
68 A1 --- l_DH Limit flag on DH
69- 73 F5.1 pc DH ? Distance measured by Hipparcos (I/239)
74 A1 --- u_DH Uncertainty flag on DH
76 A1 --- l_dph Limit flag on dph
77- 82 F6.2 pc dph ? Photometric distance inferred from the
adopted spectral classification
83 A1 --- u_dph Uncertainty flag on dph
85- 88 F4.2 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 --- Name Comparison or check star name
12- 16 F5.2 mag Vmag V magnitude (1)
19- 22 F4.2 mag U-B U-B colour index (1)
23 A1 --- u_U-B [:] : for errors of the order of 0.02 mag
25- 28 F4.2 mag B-V B-V colour index (1)
30- 33 F4.2 mag B-R B-Rc colour index (1)
35- 38 F4.2 mag V-I V-Ic colour index (1)
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Note (1): Errors are of the order of 0.01 magnitudes.
The epochs of observation are given in Table1
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Program star name
11- 19 A9 --- VName Variable name of program star
21- 38 A18 --- SpType Revised classification
40- 54 A15 --- SpType2 Previous classification
57- 75 A19 --- r_SpType2 Bibcode of SpType2 reference (Cutispoto et al.)
77- 81 F5.1 pc DHl Lower limit of Hipparcos (I/239)
distance interval
83- 88 F6.1 pc DHu Upper limit of Hipparcos (I/239)
distance interval
90- 92 I3 pc dph Photometric distance inferred from adopted
spectral classification
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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 X 2003A&A...400..659C 2003A&A...400..659C, Cat. J/A+A/400/659
(End) Patricia Bauer [CDS] 19-Mar-2001