J/other/PASA/32.21    Long-Term Multicolour Phot. of YSOs      (Ibryamov+, 2015)
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Beginning of ReadMe : 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 ================================================================================ 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) 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.

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