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J/AJ/149/111       BRI light curves of 2MASS J02272637+1156494      (Liu+, 2015)

First photometric solution of a very short period contact binary below the period limit. Liu L., Chen W.P., Qian S.B., Chuang R.J., Jiang L.Q., Lin C.S., Hsiao H.Y. <Astron. J., 149, 111 (2015)> =2015AJ....149..111L
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI Keywords: binaries: close - binaries: eclipsing - stars: evolution - stars: individual: 2MASS J02272637+1156494 Abstract: The star 1SWASP J022727.03+115641.7 was reported as a contact binary with a period shorter than the empirical limit of such systems. Our study shows the star not to be variable. Instead, it is the nearby star, 2MASS 02272637+1156494, that exhibits variability. The BRI CCD light curves of 2MASS 02272637+1156494 show the system to be a moderate mass ratio (2.154-0.074+0.008), and shallow contact (10.4-1.9+1.4%) W-type contact binary. The masses, radii, and luminosities of the binary components are, respectively, M1=0.25-0.01+0.05M, M2=0.54-0.04+0.11M, R1=0.45-0.01+0.02R, R2=0.63-0.02+0.04R, L1=0.038-0.005+0.018L, and L2=0.071-0.010+0.037L, with an estimated distance 326-46+127 pc. These uncertainties mainly come from the errors of the colors used to estimate the temperature of the primary star. A dark spot was introduced on the massive component in the final solution. Description: The field of 2MASS J02272637+1156494 was observed for three nights (2013 September 7, 9, 11) with the Lulin One-meter Telescope (LOT) of the National Central University in Taiwan, located at 120°52'25''E, 23°28'07''N, and at an altitude of 2862m. A PI1340*1300 B CCD was used, with the standard UBVRI filter set, that gave an effective FOV of about 11.5*11.2arcmin2. For the data reported here, the integration times for the images were 120s in the BRI bands. Objects: ------------------------------------------------------------------------------- RA (ICRS) DE Designation(s) (Period) ------------------------------------------------------------------------------- 02 27 26.37 +11 56 49.4 2M 0227+1156 = 2MASS J02272637+1156494 (P=0.21095) ------------------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 21 191 The original data of 2MASS 02272637+1156494 observed in the BRI bands by the Lulin One-meter Telescope (LOT)
See also: I/297 : NOMAD Catalog (Zacharias+ 2005) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/A+A/528/A90 : SuperWASP short period eclipsing binaries (Norton+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 F8.5 d HJD Heliocentric Julian Date (HJD-2456500) 10- 14 F5.3 mag Dmag [-0.085/1.349] Δ magnitude 16- 19 F4.3 mag e_Dmag Uncertainty in Dmag 21 A1 --- Flt [BRI] Filter (B, R, or I)
History: From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 25-Mar-2015
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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