J/other/PASA/32.21 Long-Term Multicolour Photometry of YSOs (Ibryamov+, 2015)
Long-term multicolour photometry of the young stellar objects FHO 26, FHO 27,
FHO 28, FHO 29, and V1929 Cygni.
Ibryamov S., Semkov E., Peneva S.
<Publ. Astron. Soc. Australia, 32.21 (2015)>
=2015PASA...32...21I 2015PASA...32...21I
ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; YSOs ;
Photometry, UBVRI
Keywords: stars: pre-main sequence - star: variable: T Tauri, UX Orionis -
stars: individual: FHO 26, FHO 27, FHO 28, FHO 29, V1929 Cygni
Abstract:
Results from long-term multicolour optical photometric observations of
the pre-main sequence stars FHO 26, FHO 27, FHO 28, FHO 29, and V1929
Cyg collected during the period from 1997 June to 2014 December are
presented. The objects are located in the dense molecular cloud L935,
named 'Gulf of Mexico', in the field between the North America and
Pelican nebulae. All stars from our study exhibit strong photometric
variability in all optical passbands. Using our BVRI observations and
data published by other authors, we tried to define the reasons for
the observed brightness variations. The presented paper is a part of
our long-term photometric study of the young stellar objects in the
region of 'Gulf of Mexico'.
Description:
BVRI photometric data of five young stellar objects (FHO 26, FHO 27,
FHO 28, FHO 29, and V1929 Cygni) during the period from 1997 June to
2014 December 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 eight different types
of CCD cameras - Photometrics AT200 and VersArray 1300B at the 2-m RCC
telescope; Photometrics CH360 and ANDOR DZ436-BV at the 1.3-m RC
telescope; SBIG ST-8, SBIG STL-11000M and 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 set of filters.
The total number of the nights used for observations is 292. 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 20.5mag and for the data
collected with the 50/70-cm Schmidt and the 60-cm Cassegrain
telescopes is about 19.5mag. 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 0.01-0.05mag for I- and
R-band data, 0.02-0.08 mag for V-band data and 0.03-0.11mag for
B-band data.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 65 5 List of studied stars
table1.dat 68 108 2000-2014 photometric observations of FHO 26
table2.dat 70 154 2000-2014 photometric observations of FHO 27
table3.dat 70 292 2000-2014 photometric observations of FHO 28
table4.dat 68 128 2000-2014 photometric observations of FHO 29
table5.dat 68 140 2000-2014 photometric observations of V1929 Cyg
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See also:
J/other/BAJ/22.3 : BVRI photometry of 5 PMS stars (Ibryamov+, 2015)
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/32.11 : Long-term UBVRI photometry of GM Cephei (Semkov+, 2015)
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 Right ascension (J2000)
14- 15 I2 min RAm Right ascension (J2000)
17- 21 F5.2 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 33 F4.1 arcsec DEs Declination (J2000)
35- 44 A10 --- FileName Name of the file with photometry
46- 51 F6.3 mag Bmag B-band magnitude (at maximum)
53- 58 F6.3 mag Vmag V-band magnitude (at maximum)
60- 65 F6.3 mag Imag I-band magnitude (at maximum)
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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 "DD.MM.YYYY" Date Date of observation
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- 61 A6 --- CCD CCD used (2)
63- 70 A8 --- Obs Name of observatory
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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:
ST-8 = SBIG ST-8
STL-11 = SBIG STL-11000M
FLI = FLI PL16803 (50/70-cm Shmidt telescope)
FLI PL09000 (60-cm Cassegrain telescope)
Phot = Photometrics AT200 (2-m RCC telescope)
Photometrics CH360 (1.3-m RC telescope)
VA = VersArray 1300B
ANDOR = ANDOR DZ436-BV
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Acknowledgements:
Sunay I. Ibryamov, sibryamov(at)astro.bas.bg,
Bulgarian Academy of Sciences; University of Shumen, Bulgaria
(End) Patricia Vannier [CDS] 27-May-2015