J/A+AS/127/207 UBV(RI)c photometry of active stars. VII. (Cutispoto 1998)
Long-term monitoring of active stars.
VII. UBV(RI)cphotometry collected in March 1991
Cutispoto G.
<Astron. Astrophys. Suppl. Ser. 127, 207 (1998)>
=1998A&AS..127..207C 1998A&AS..127..207C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, UBVRI ; Photometry, Cousins ;
Stars, flare
Keywords: stars: activity - stars: flare - stars: late-type - stars: variables -
techniques: photometric - stars: HD 127535
Abstract:
In the framework of an extensive program focusing on the global
properties and evolution of active stars, high-precision UBV(RI)c
photometry of 19 selected stars, collected at ESO over the 15-31 March
1991 interval is presented. Significant evolution of the light curves,
period variations and evidence for long-term variability of the global
degree of spottedness are found. Most of the spectral classification
are discussed. A flare event was detected for the star HD 127535 =
V841 Cen. These observations contribute to the establishment of a
time-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
table1.dat 47 19 Comparison (c) and check (ck) stars for each
program star (v)
table3.dat 39 38 V magnitude and colors for the c and ck stars
derived from standards stars.
table4.dat 66 21 Maximun luminosity (Vmax) and corresponding
colors for the program stars and inferred
spectral classification
appen.dat 57 280 UBV(RI)c data of the 19 active stars observed
tables.tex 80 173 LaTeX version of tables 1 to 4
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See also:
J/A+AS/119/281 : UBV(RI)c photometry of active stars. V. (Cutispoto, 1996)
J/A+AS/121/369 : UBVRI observations of active stars. VI. (Cutispoto, 1997)
J/A+AS/131/321 : UBV(RI)c photometry of active stars. VIII. (Cutispoto 1998)
J/A+A/367/910 : UBV(RI)c photometry of active stars. IX. (Cutispoto+, 2001)
J/A+A/400/659 : UBV(RI)c photometry of active stars. X. (Cutispoto+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- HD HD name of program star
11- 18 A8 --- Name Other name of program star
20- 28 A9 --- cHD HD name of comparison star
30- 39 A10 --- ckName Name of check star
41- 42 I2 mmag sig(v-c) Standard deviation for the (v-c) V-band
differential magnitude for each series of nights
44 I1 mmag sig(ck-c) Standard deviation for the (ck-c) V-band
differential magnitude for each series of nights
46- 47 I2 --- N Number of nights
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Table 2: Mean atmospheric extinction coefficients for La Silla site,
obtained over the 15-31 Mar 1991 period
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U B V R I
---------------------------------------------------------------------
Mag/airmass | .520 .274 .157 .107 .053
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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 --- Name Comparison or check star name
13- 16 F4.2 mag Vmag V magnitude
18- 21 F4.2 mag U-B U-B colour index
22 A1 --- u_U-B [:] Note on error (1)
24- 27 F4.2 mag B-V B-V colour index
28 A1 --- u_B-V [:] Note on error (1)
30- 33 F4.2 mag V-Rc V-Rc colour index
36- 39 F4.2 mag R-Ic R-Ic colour index
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Note (1): blank : errors of the order of 0.01mag
":" : errors of the order of 0.02mag
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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- 9 A9 --- HD HD name of program star
10- 11 A2 --- m_HD Multiplicity index on HD
13- 20 A8 --- Name Other name of program star
22- 26 F5.2 mag Vmax Maximun luminosity
28- 31 F4.2 mag U-B ? U-B colour index corresponding to Vmax
33- 36 F4.2 mag B-V B-V colour index corresponding to Vmax
38- 41 F4.2 mag V-Rc V-Rc colour index corresponding to Vmax
43- 46 F4.2 mag V-Ic V-Ic colour index corresponding to Vmax
48- 67 A20 --- SpType Inferred spectral classification
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Byte-by-byte Description of file: appen.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 21 F12.4 d HJD Heliocentric Julian day
23- 27 F5.4 --- Phase ? [0/1[ Corresponding phase
29- 33 F5.3 mag Vmag V magnitude
35- 39 F5.3 mag U-B ? U-B colour index
41- 45 F5.3 mag B-V ? B-V colour index
47- 51 F5.3 mag (V-R)c (V-R)c colour index
53- 57 F5.3 mag (V-I)c (V-I)c colour index
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Ephemerid and observation periods in appen.dat file:
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Name Observation period Epemerid used to compute the phases
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YY Men (15 - 29 Mar 1991) HJD=2444155.64 + 9.5476 x E
AB Dor (15 - 28 Mar 1991) HJD=2444296.575 + 0.51423 x E
TWLep (15 - 12 Apr 1991) HJD=2444652.0 + 28.22 x E
SZ Pic (15 - 31 Mar 1991) HJD=2443931.54 + 4.905 x E
V344 Pup (15 - 27 Mar 1991) HJD=2448331.5 + 11.761 x E
IL Hya (15 - 28 Mar 1991) HJD=2441466.213 + 12.86833 x E
LQ HYa (15 - 28 Mar 1991) HJD=2445275.993 + 1.5978 x E
HD 86005 (15 - 25 Mar 1991)
SZ Crt (16 - 27 Mar 1991) HJD=2448331.5 + 11.58 x E
V829 Cen (15 - 28 Mar 1991) HJD=2448331.5 + 11.65 x E
V838 Cen (15 - 29 Mar 1991) HJD=2448331.5 + 1.847 x E
HU Vir (15 - 30 Mar 1991) HJD=2448331.5 + 10.40 x E
V851 Cen (15 - 31 Mar 1991) HJD=2448331.5 + 12.05 x E
V841 Cen (15 - 31 Mar 1991) HJD=2445804.1 + 5.929 x E
GX Lib (15 - 29 Mar 1991) HJD=2445061.901 + 11.13448 x E
V343 Nor (15 - 28 Mar 1991) HJD=2448331.5 + 4.24 x E
V824 Ara (15 - 31 Mar 1991) HJD=2448331.5 + 1.694 x E
PZ Tel (15 - 31 Mar 1991) HJD=2448331.5 + 0.9447 x E
AU Mic (20 - 31 Mar 1991) HJD=2448331.5 + 4.865 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
Cutispoto et al., Paper X 2003A&A...400..659C 2003A&A...400..659C, Cat. J/A+A/400/659
(End) Patricia Bauer [CDS] 26-Aug-1997