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J/A+A/597/A129      Galactic RV Tauri stars velocities           (Manick+, 2017)

Establishing binarity amongst Galactic RV Tauri stars with a disc. Manick R., Van Winckel H., Kamath D., Hillen M., Escorza A. <Astron. Astrophys. 597, A129 (2017)> =2017A&A...597A.129M (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Radial velocities Keywords: stars: variables: Cepheids - binaries: spectroscopic - stars: AGB and post-AGB - circumstellar matter - stars: distances - stars: chemically peculiar Abstract: Over the last few decades it has become more evident that binarity is a prevalent phenomenon amongst RV Tauri stars with a disc. This study is a contribution to comprehend the role of binarity upon late stages of stellar evolution. In this paper we determine the binary status of six Galactic RV Tauri stars, namely DY Ori, EP Lyr, HP Lyr, IRAS 17038-4815, IRAS 09144-4933, and TW Cam, which are surrounded by a dusty disc. The radial velocities are contaminated by high-amplitude pulsations. We disentangle the pulsations from the orbital signal in order to determine accurate orbital parameters. We also place them on the HR diagram, thereby establishing their evolutionary nature. We used high-resolution spectroscopic time series obtained from the HERMES and CORALIE spectrographs mounted on the Flemish Mercator and Swiss Leonhard Euler Telescopes, respectively. An updated ASAS/AAVSO photometric time series is analysed to complement the spectroscopic pulsation search and to clean the radial velocities from the pulsations. The pulsation-cleaned orbits are fitted with a Keplerian model to determine the spectroscopic orbital parameters. We also calibrated a PLC relationship using type II Cepheids in the LMC and apply the relation to our Galactic sample to obtain accurate distances and hence luminosities. All six of the Galactic RV Tauri stars included in this study are binaries with orbital periods ranging between ∼650 and 1700 days and with eccentricities between 0.2 and 0.6. The mass functions range between 0.08 to 0.55M which points to an unevolved low-mass companion. In the photometric time series we detect a long-term variation on the timescale of the orbital period for IRAS 17038-4815, IRAS 09144-4933, and TW Cam. Our derived stellar luminosities indicate that all except DY Ori and EP Lyr are post-AGB stars. DY Ori and EP Lyr are likely examples of the recently discovered dusty post-RGB stars. The orbital parameters strongly suggest that the evolution of these stars was interrupted by a strong phase of binary interaction during or even prior to the AGB. The observed eccentricities and long orbital periods among these stars provide a challenge to the standard theory of binary evolution. Description: We present the original radial velocities obtained at the Mercator and Swiss Leonhard Telescopes, together with the pulsation-cleaned radial velocities. The errors in the pulsation-cleaned radial velocities are assumed to be the same as in the ones in the original data. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 50 6 List of studied stars dy_ori.dat 31 71 Original and cleaned RVs for DY ori ep_lyr.dat 31 58 Original and cleaned RVs for EP Lyr hp_lyr.dat 31 50 Original and cleaned RVs for HP Lyr i09144.dat 31 74 Original and cleaned RVs for IRAS 09144 i17038.dat 31 75 Original and cleaned RVs for IRAS 17038 tw_cam.dat 31 87 Original and cleaned RVs for TW Cam
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Star name 17- 18 I2 h RAh Simbad Rigth ascension (J2000) 20- 21 I2 min RAm Simbad Rigth ascension (J2000) 23- 27 F5.2 s RAs Simbad Rigth ascension (J2000) 29 A1 --- DE- Simbad Declination sign (J2000) 30- 31 I2 deg DEd Simbad Declination (J2000) 33- 34 I2 arcmin DEm Simbad Declination (J2000) 36- 39 F4.1 arcsec DEs Simbad Declination (J2000) 41- 50 A10 --- FileName Name of the file with velocities
Byte-by-byte Description of file: ??_???.dat i[01]*.dat
Bytes Format Units Label Explanations
1- 10 F10.2 d JD Julian date 12- 18 F7.2 km/s RV Original radial velocities 20- 26 F7.2 km/s RVc Pulsation-cleaned radial velocities 28- 31 F4.2 km/s e_RV Error in the pulsation cleaned RV assumed to be same as the original RV
Acknowledgements: Rajeev Manick, rajeevmnck(at)gmail.com
(End) Rajeev Manick [KU Leuven], Patricia Vannier [CDS] 21-Dec-2016
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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