J/other/RAA/18.137 Long-term BVRI photometry of 15 PMS stars (Ibryamov+, 2018)
Long-term BVRI photometric light curves of 15 PMS stars in the star-forming
region IC 5070.
Ibryamov S., Semkov E., Milanov T., Peneva S.
<Res. Astron. Astrophys., 18, 137 (2018)>
=2018RAA....18..137I 2018RAA....18..137I (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; Photometry, UBVRI
Keywords: stars: pre-main sequence - star: variables: T Tauri, Herbig Ae/Be -
stars: individual: LkHa 137, 2MASS J20504608+4419100, V1956 Cyg,
LkHa 141, V1490 Cyg, V1532 Cyg, V1597 Cyg, LkHa 146, LkHa 147,
V1598 Cyg, V1492 Cyg, LkHa 161, LkHa 168, LkHa 172, LkHa 173
Abstract:
This paper reports results from the multicolor photometric
observations of 15 pre-main sequence stars collected in the period
September 2010 - October 2017. The stars from our study are located in
the star-forming HII region IC 5070. These objects were previously
detected as either emission line stars, flare stars, T Tauri variables
or Herbig Ae/Be stars. Photometric observations, especially concerning
the long-term behavior of the objects, are missing in the literature.
We present the first photometric monitoring for all stars from our
study. The analysis of the obtained BVRI photometric data allows us to
draw the conclusion that all investigated objects are variable stars.
In the case of LkHa 146, we identified previously unknown periodicity
in its photometric variability.
Description:
BVRI photometric data of 15 pre-main sequence stars collected during
the period from September 2010 to October 2017 are presented. All CCD
observations were obtained with two telescopes - the 50/70-cm Schmidt
and the 60-cm Cassegrain - administered by Rozhen National
Astronomical Observatory in Bulgaria. The number of observational
nights used to estimate the brightness of each object is 119. The
observations were performed with two different types of CCD cameras:
FLI PL16803 on the 50/70-cm Schmidt telescope and FLI PL09000 on the
60-cm Cassegrain telescope. The technical parameters and
specifications for the cameras used are given in Ibryamov et al.
(2015PASA...32...21I 2015PASA...32...21I, Cat. J/other/PASA/32.21). All frames were taken
through a standard Johnson-Cousins (BVRI) set of filters. The frames
were dark frame subtracted and flat field corrected. The photometric
data were reduced using an IDL based DAOPHOT subroutine. As a
reference, the BVRI comparison sequence of 11 stars reported in
Ibryamov et al. (2018PASA...35....7I 2018PASA...35....7I, Cat. J/other/PASA/35.7) was
used. 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 to 14-arcsec. The mean value of errors in the reported magnitudes is
0.01-0.02mag for the I- and R-band data and 0.01-0.03mag 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 63 15 List of studied stars
table1.dat 48 91 LkHa 137 photometry
table2.dat 48 91 2MASS J20504608+4419100 photometry
table3.dat 50 116 V1956 Cyg photometry
table4.dat 50 108 LkHa 141 photometry
table5.dat 48 74 V1490 Cyg photometry
table6.dat 48 67 V1532 Cyg photometry
table7.dat 50 111 V1597 Cyg photometry
table8.dat 50 108 LkHa 146 photometry
table9.dat 48 103 LkHa 147 photometry
table10.dat 50 119 V1598 Cyg photometry
table11.dat 50 108 V1492 Cyg photometry
table12.dat 50 107 LkHa 161 photometry
table13.dat 50 105 LkHa 168 photometry
table14.dat 50 106 LkHa 172 photometry
table15.dat 50 116 LkHa 173 photometry
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See also:
J/other/RAA/14.1264 : V350 Cep UBVRI long-term photometry (Ibryamov+, 2014)
J/other/PASA/32.11 : Long-term UBVRI photometry of GM Cep (Semkov+, 2015)
J/other/PASA/32.21 : Long-Term Multicolour Photometry of YSOs (Ibryamov+ 2015)
J/other/BAJ/22.3 : BVRI photometry of 5 PMS stars (Ibryamov+, 2015)
J/other/BAJ/24.62 : BVRI Photometry of 14 PMS stars (Ibryamov+, 2016)
J/other/RAA/17.20 : V977 Cep & V982 Cep long-term photometry (Ibryamov+ 2017)
J/other/PASA/35.7 : Long-term BVRI photometry of V2492 Cygni (Ibryamov+ 2018)
J/other/BAJ/29.10 : Long-term BVRI photometry of V1704 Cygni (Ibryamov+ 2018)
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- 27 A17 --- 2MASS 2MASS ID (JHHMMSSss+DDMMSSs)
29- 30 I2 h RAh Righ Ascension (J2000)
32- 33 I2 min RAm Righ Ascension (J2000)
35- 39 F5.2 s RAs Righ Ascension (J2000)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 51 F4.1 arcsec DEs Declination (J2000)
53- 63 A11 --- FileName Name of the file with photometry
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Byte-by-byte Description of file: table*.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of observation ('YYYY/MM/DD' format)
12- 20 F9.3 d JD Julian Date (JD-2400000)
22- 26 F5.2 mag Bmag ? B magnitude
28- 32 F5.2 mag Vmag ? V magnitude
34- 38 F5.2 mag Rmag ? R magnitude
40- 44 F5.2 mag Imag ? I magnitude
46- 50 A5 --- Tel Telescope used (1)
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Note (1): Telescopes as follows:
Sch = 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)
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Acknowledgements:
Dr. Sunay I. Ibryamov, sibryamov(at)shu.bg,
Department of Physics and Astronomy, University of Shumen, Bulgaria.
(End) Patricia Vannier [CDS] 02-Jan-2019