J/other/RAA/17.20 V977 Cep and V982 Cep long-term photometry (Ibryamov+, 2017)
Long-term photometric behavior of the PMS stars V977 Cep and V982 Cep in the
vicinity of NGC 7129.
Ibryamov S.I., Semkov E.H., Milanov T.R., Peneva S.P.
<Res. Astron. Astrophys., 17, 20 (2017)>
=2017RAA....17...20I 2017RAA....17...20I (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; Photometry, UBVRI
Keywords: stars: pre-main sequence - star: variable: T Tauri -
stars: individual (V977 Cep, V982 Cep)
Abstract:
Long-term BVRI photometric light curves of the pre-main sequence stars
V977 Cep and V982 Cep during the period from 2000 October to 2016
August are presented. The stars are located in the vicinity of the
reflection nebula NGC 7129. Our photometric data show that both stars
exhibit strong photometric variability in all optical passbands, which
is typical for Classical T Tauri stars. Using our observational data
we analyze the reasons for the observed brightness variations. In the
case of V977 Cep we identify previously unknown periodicity in its
light curve.
Description:
BVRI photometric data of V977 Cep and V982 Cep during the period from
2000 October to 2016 August are presented. The CCD observations were
carried out with the 50/70-cm Schmidt and the 60-cm Cassegrain
telescopes administered by Rozhen National Astronomical Observatory in
Bulgaria. The observations were performed with four different types of
CCD cameras: SBIG ST-8, SBIG STL-11000M and FLI PL16803 on the
50/70-cm Schmidt telescope, and FLI PL09000 on the 60-cm Cassegrain
telescope. All frames were taken through a standard Johnson-Cousins
set of filters. All obtained frames are dark frame subtracted and flat
field corrected. The photometric data were reduced using subroutine
DAOPHOT in the IDL software package. All data were analyzed using the
same aperture, which was chosen to have a 6-arcsec radius and
background annulus from 10-arcsec to 15-arcsec. As a reference
sequence we used the BVRI comparisons reported in Semkov
(2002IBVS.5214....1S 2002IBVS.5214....1S; 2003IBVS.5373....1S 2003IBVS.5373....1S). The average value of the
errors in the reported magnitudes are 0.01-0.02mag for the I- and
R-band data, and 0.02-0.03mag for the V- and B-band data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 39 2 List of studied stars
table1.dat 61 156 V977 Cep photometric CCD observations during
the period 2000 Oct. - 2016 Aug.
table2.dat 61 180 V982 Cep photometric CCD observations during
the period 2002 Oct. - 2016 Aug.
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See also:
J/other/RAA/14.1264 : V350 Cep UBVRI long-term photometry (Ibryamov+, 2014)
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 Star name
11- 12 I2 h RAh Righ ascension (J2000)
14- 15 I2 min RAm Righ ascension (J2000)
17- 20 F4.1 s RAs Righ ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 39 A6 --- FileName Name of the file with photometry
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of observation ('YYYYMMDD' format)
12- 22 A11 d JD Julian Date
24- 28 F5.2 mag Imag ? Cousins I magnitude
30- 34 F5.2 mag Rmag ? Cousins R magnitude
36- 40 F5.2 mag Vmag ? Johnson V magnitude
42- 46 F5.2 mag Bmag ? Johnson B magnitude
48- 54 A7 --- Tel Telescope used (1)
56- 61 A6 --- CCD CCD used (2)
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Note (1): Telescopes as follows:
Schmidt = 50/70-cm Schmidt telescope of the Rozhen NAO
60-cm = 60-cm Cassegrain telescope of the Rozhen NAO
Note (2): CCD cameras as follows:
ST-8 = SBIG ST-8
STL-11 = SBIG STL-11000M
FLI = FLI PL16803 (50/70-cm Shmidt telescope)
FLI PL09000 (60-cm Cassegrain telescope)
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Acknowledgements:
Dr. Sunay I. Ibryamov, sibryamov(at)shu.bg,
Department of Physics, University of Shumen, Bulgaria
(End) Patricia Vannier [CDS] 27-Feb-2017