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J/AJ/153/248                  Spectroscopy of V Tri                 (Ren+, 2017)

Photometric and spectroscopic observations of the Algol type binary V triangle. Ren A.B., Zhang X.B., Fu J.N., Zhang Y.P., Cang T.Q., Fox-Machado L., Li C.Q., Khokhuntod P., Luo Y.P. <Astron. J., 153, 248-248 (2017)> =2017AJ....153..248R (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Radial velocities Keywords: binaries: eclipsing - stars: fundamental parameters - stars: individual: V Tri Abstract: Time-series, multi-color photometry and high-resolution spectra of the short-period eclipsing binary V Tri were obtained through observation. The completely covered light and radial velocity (RV) curves of the binary system are presented. All times of light minima derived from both photoelectric and CCD photometry were used to calculate the orbital period and new ephemerides of the eclipsing system. The analysis of the O-C diagram reveals that the orbital period is 0.58520481 days, decreasing at a rate of dP/dt=-7.80x10-8 day/yr. The mass transfer between the two components and the light-time-travel effect due to a third body could be used to explain the period decrease. However, a semi-detached configuration with the lower-mass component filling and the primary nearly filling each of their Roche lobes was derived from the synthesis of the light and RV curves by using the 2015 version of the Wilson-Devinney code. We consider the period decrease to be the nonconservative mass transfer from the secondary component to the primary and the mass loss of the system, which was thought to be an EB type, while it should be an EA type (semi-detached Algol-type) from our study. The masses, radii, and luminosities of the primary and secondary are 1.60±0.07M, 1.64±0.02R, and 14.14±0.73L and 0.74±0.02M, 1.23±0.02R, and 1.65±0.05L, respectively. Description: The spectroscopic observations for V Tri were carried out with the 2.12m telescope at the Observatorio Astronemico Nacional on the Sierra San Pedro Martir (OAN-SPM) in Mexico on 2015 November 03 and 05. We used a 2048*2048 E2V CCD-4240 to collect the high-resolution (the maximum resolution is R=18000 at 5000Å) echelle spectra at the slit size 1''. The spectral range coverage was from 3800 to 7100Å Objects: ---------------------------------------------------------------------- RA (ICRS) DE Designation(s) (Period) ---------------------------------------------------------------------- 01 31 47.10 +30 22 01.7 V* V Tri = GSC 02293-01403 (P=0.58520481) ---------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 56 3 Main feature parameters of the variable, comparison, and check stars table3.dat 25 10 Heliocentric radial velocities of the primary component for V Tri table4.dat 51 81 Photoelectric and CCD times of light minima of V Tri along with the residuals computed from the quadratic ephemerides refs.dat 69 34 References
See also: J/other/IBVS/5984 : Minima and maxima of 503 variables (Hubscher, 2011) J/other/IBVS/5918 : Minima and maxima of 452 variables (Hubscher+, 2010) J/other/JAVSO/38.183 : Time of minima of eclipsing binaries (Samolyk+, 2010) J/other/IBVS/5830 : Minima and maxima of 292 variables (Hubscher+, 2008) J/other/IBVS/5761 : Minima and maxima of 389 variables (Hubscher+, 2007) J/other/IBVS/5731 : Minima and maxima of 816 variables (Hubscher+, 2006) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Star Star 12- 13 I2 h RAh Hour of Right Ascension (J2000) 15- 16 I2 min RAm Minute of Right Ascension (J2000) 18- 23 F6.3 s RAs Second of Right Ascension (J2000) 25 A1 --- DE- Sign of the Declination (J2000) 26- 27 I2 deg DEd Degree of Declination (J2000) 29- 30 I2 arcmin DEm Arcminute of Declination (J2000) 32- 36 F5.2 arcsec DEs Arcsecond of Declination (J2000) 38- 42 F5.2 mag Bmag The B-band magnitude 44- 48 F5.2 mag Vmag ? The V-band magnitude 50- 53 F4.2 mag B-V ? The B-V color index 55- 56 A2 --- SpT Spectral type
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 F10.4 d HJD Heliocentric Julian Date (HJD-2400000) 12- 17 F6.4 --- Phase Phase 19- 22 I4 km/s RV Radial velocity 24- 25 I2 km/s e_RV Error in RV
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 10 F10.4 d HJD Heliocentric Julian Date (HJD-2400000) of light minimum time 12- 17 F6.4 d e_HJD ? Error in HJD 19- 21 A3 --- Meth Method (CCD or pe=photoelectric) 23- 24 A2 --- Min Minimum type (I or II) 26- 32 F7.1 --- E Epoch number 34- 40 F7.4 d L(O-C) The (O-C) linear residual for the time of light minimum 42- 48 F7.4 d LQ(O-C) The (O-C) quadratic residual for the time of light minimum 50- 51 I2 --- Ref [1/34] Reference; in refs.dat file
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference code 4- 22 A19 --- BibCode Bibliographic code 24- 43 A20 --- Auth Author's name 45- 69 A25 --- Cat Catalog in VizieR database
History: From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 09-Aug-2017
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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