J/other/BAJ/24.62 BVRI Photometry of 14 PMS stars (Ibryamov+, 2016)
Photometric variability of 14 PMS stars in the NGC 7000/IC 5070 complex.
Ibryamov S.I, Semkov E.H.
<Bulgarian Astron. J., 24, 62-88 (2016)>
=2016BAJ....24...62I 2016BAJ....24...62I (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; Photometry, UBVRI
Keywords: stars: pre-main sequence - star: variable: T Tauri, UX Orionis -
stars: individual: V521 Cyg, V752 Cyg, V1538 Cyg, V1539 Cyg,
V1716 Cyg, V1957 Cyg, V2051 Cyg, LkHa 186, LkHa 187, LkHa 189,
LkHa 191, [KW97] 53-11, [Kw97] 53-23, [KW97] 53-36
Abstract:
New photometric data from CCD multicolour BVRI observations of 14
pre-main sequence stars during the period from 2013 April to 2015
September are presented. The studied objects are located in the field
of 'Gulf of Mexico' in the NGC 7000/IC 5070 star-forming complex. The
stars from our study exhibit different types of photometric
variability in all optical passbands. Using our long-term observations
and data published by other authors, we tried to define the reasons
for the observed brightness variations. On the basis of our new data
previously unknown periodicity in the light curve of the star LkHa 189
(2.45-days) was registered.
Description:
BVRI photometric data of 14 pre-main sequence stars (V521 Cyg, V752
Cyg, V1538 Cyg, V1539 Cyg, V1716 Cyg, V1957 Cyg, V2051 Cyg, LkHa 186,
LkHa 187, LkHa 189, LkHa 191, [KW97] 53-11, [Kw97] 53-23 and [KW97]
53-36 during the period from 2013 April to 2015 September are
presented.
The CCD observations were performed in two astronomical observatories,
with four telescopes. These are the 2-m Ritchey-Chretien-Coude (RCC),
the 50/70-cm Schmidt and the 60-cm Cassegrain telescopes of the Rozhen
National Astronomical Observatory of the Bulgarian Academy of Sciences
and the 1.3-m Ritchey-Chretien (RC) telescope of the Skinakas
Observatory of the University of Crete (Greece).
The observations were performed with four different types of CCD
cameras - VersArray 1300B at the 2-m RCC telescope; ANDOR DZ436-BV at
the 1.3-m RC telescope; FLI PL16803 at the 50/70-cm Schmidt telescope;
FLI PL09000 at the 60-cm Cassegrain telescope. All frames were taken
through a standard Johnson-Cousins (BVRcIc) set of filters. The
total number of the nights used for observations is 84. The
photometric limit of our data obtained with the 2-m RCC and the 1.3-m
RC telescopes in B- and V-band is about 20.5 mag and for the data
collected with the 50/70-cm Schmidt and the 60-cm Cassegrain
telescopes is about 19.50mag. All data were analyzed using the same
aperture, which was chosen to have a 4-arcsec radius, while the
background annulus was taken from 9-arcsec to 14-arcsec.
The photometric data were reduced by IDL package (standard subroutine
DAOPHOT) and as a reference, the BVRI comparison sequence reported in
Semkov et. al. (2010A&A...523L...3S 2010A&A...523L...3S) was used.
The average value of the errors in the reported magnitudes are
0.01-0.02mag for I- and R-band data, 0.02-0.06mag for V-band data
and 0.02-0.09mag for B-band data.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 67 14 List of studied stars
table1.dat 60 33 V521 Cyg photometric CCD observations
during the period 2014 Aug. - 2015 Sep.
table2.dat 58 16 V752 Cyg photometric CCD observations
during the period 2014 Aug. - 2015 Sep.
table3.dat 60 61 V1538 Cyg photometric CCD observations
during the period 2013 May - 2015 Sep.
table4.dat 60 22 V1539 Cyg photometric CCD observations
during the period 2014 Aug. - 2015 Sep.
table5.dat 60 33 V1716 Cyg photometric CCD observations
during the period 2014 Aug. - 2015 Sep.
table6.dat 60 61 V1957 Cyg photometric CCD observations
during the period 2013 May - 2015 Sep.
table7.dat 60 22 V2051 Cyg photometric CCD observations
during the period 2014 Aug. - 2015 Sep.
table8.dat 60 82 LkHa 186 photometric CCD observations
during the period 2013 Apr. - 2015 Sep.
table9.dat 60 84 LkHa 187 photometric CCD observations
during the period 2013 Apr. - 2015 Sep.
table10.dat 60 84 LkHa 189 photometric CCD observations
during the period 2013 May - 2015 Sep.
table11.dat 58 53 LkHa 191 photometric CCD observations
during the period 2013 Apr. - 2015 Sep.
table12.dat 60 79 [KW97] 53-11 photometric CCD observations
during the period 2013 Apr. - 2015 Sep.
table13.dat 58 82 [KW97] 53-23 photometric CCD observations
during the period 2013 Apr. - 2015 Sep.
table14.dat 60 48 [KW97] 53-36 photometric CCD observations
during the period 2013 Apr. - 2015 Sep.
--------------------------------------------------------------------------------
See also:
J/A+A/556/A60 : BVRI observations of FUor star V582 Aur (Semkov+, 2013)
J/A+A/568/A49 : PMS sequence stars long term phot. (Poljancic Beljan+, 2014)
J/other/RAA/14.1264 : V350 Cep UBVRI long-term photometry (Ibryamov+, 2014)
J/other/PASA/32.21 : YSOs long-term multicolour photometry (Ibryamov+, 2015)
J/other/PASA/32.11 : Long-term UBVRI photometry of GM Cep (Semkov+, 2015)
J/A+A/582/A113 : V1184 Tauri UBVRI light curves (Semkov+, 2015)
J/other/BAJ/22.3 : BVRI photometry of 5 PMS stars (Ibryamov+, 2015)
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Star Star name
14- 30 A17 --- 2MASS 2MASS ID (JHHMMSSss+DDMMSSs)
32- 33 I2 h RAh Righ Ascension (J2000)
35- 36 I2 min RAm Righ Ascension (J2000)
38- 42 F5.2 s RAs Righ Ascension (J2000)
44 A1 --- DE- Declination sign (J2000)
45- 46 I2 deg DEd Declination (J2000)
48- 49 I2 arcmin DEm Declination (J2000)
51- 55 F5.2 arcsec DEs Declination (J2000)
57- 67 A11 --- FileName Name of the file with photometry
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "date" Date Date of observation ('DD.MM.YYYY' format)
12- 22 F11.3 d JD Julian Date
24- 28 F5.2 mag Imag ? I magnitude
30- 34 F5.2 mag Rmag ? R magnitude
36- 40 F5.2 mag Vmag ? V magnitude
42- 46 F5.2 mag Bmag ? B magnitude
48- 54 A7 --- Tel Telescope used (1)
56- 60 A5 --- CCD CCD used (2)
--------------------------------------------------------------------------------
Note (1): Telescopes as follows:
2-m = 2-m Ritchey-Chretien-Coude telescope of the Rozhen National
Astronomical Observatory (Bulgaria)
1.3-m = 1.3-m Ritchey-Chretien telescope of the Skinakas Observatory of
the University of Crete (Greece)
Schmidt = 50/70-cm Schmidt telescope of the Rozhen National Astronomical
Observatory (Bulgaria)
60-cm = 60-cm cassegrain telescope of the Rozhen National Astronomical
Observatory (Bulgaria)
Note (2): CCD cameras as follows:
FLI = FLI PL16803 (50/70-cm Shmidt telescope)
FLI PL09000 (60-cm Cassegrain telescope)
VA = VersArray 1300B
ANDOR = ANDOR DZ436-BV
--------------------------------------------------------------------------------
Acknowledgements:
Sunay I. Ibryamov, sibryamov(at)shu.bg
University of Shumen, Bulgaria; Bulgarian Academy of Sciences
(End) Patricia Vannier [CDS] 12-Feb-2016