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J/A+A/501/291       Spectroscopic observations of HD 152219         (Sana, 2009)

The nature of the line profile variability in the spectrum of the massive binary HD 152219. Sana H. <Astron. Astrophys. 501, 291 (2009)> =2009A&A...501..291S
ADC_Keywords: Binaries, spectroscopic - Observatory log - Radial velocities Keywords: stars: individual: HD 152219 - stars: oscillations - binaries: close - binaries: spectroscopic - stars: early-type - line: profiles Abstract: HD 152219 is a massive binary system with O9.5 III + B1-2 V/III components and a short orbital period of 4.2d. Its primary component further displays clear line profile variability (LPV). The primary component being located within the pulsational instability domain predicted for high-luminosity stars, we previously suggested that the observed LPV could be associated with non-radial pulsations. The aim of the present work is to determine the nature of the observed LPV in the spectrum of the primary component of HD 152219. During a 4-night FEROS monitoring campaign, we collected a new set of 134 high signal-to-noise spectra. These new observations were then used to re-investigate the variability of different line profiles in the spectrum of HD∼152219. Based on the present analysis, we discard the non-radial pulsations and point out the Rossiter-McLaughlin effect as the cause of the LPV in HD 152219. The upper limit on the amplitude of possible weak pulsations is set at a few parts per thousand of the continuum level. Description: Journal the spectroscopic observations of HD 152219 and radial velocity measurements of the Hbeta, HeI 4712, 4921, 5875, 6678 and HeII l4686 primary lines. Measurements made on data from Paper I (Sana et al., 2008, Cat. J/MNRAS/386/447) have also been included. Objects: ----------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------- 16 53 55.6 -41 52 51 HD 152219 = NSV 8017 ----------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 69 185 Journal the spectroscopic observations and RV measurements of HD 152219
See also: J/MNRAS/386/447 : RV catalogue of O-type stars in NGC 6231 (Sana+, 2008) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 F12.4 --- HJD Heliocentric Julian date (1) 14- 18 F5.3 --- Phi Orbital phase (2) 20- 23 I4 s Exp Exposure time 25- 27 I3 --- SNR Signal-to-noise ratio (3) 29- 34 F6.1 km/s RV4860 Hbeta primary radial velocity 36- 41 F6.1 km/s RV4686 HeII 4686 primary radial velocity 43- 48 F6.1 km/s RV4713 HeI 4713 primary radial velocity 50- 55 F6.1 km/s RV4922 HeI 4922 primary radial velocity 57- 62 F6.1 km/s RV5015 HeI 5015 primary radial velocity 64- 69 F6.1 km/s RV6678 HeI 6678 primary radial velocity
Note (1): The heliocentric Julian date is computed at mid-exposure. Note (2): The quoted phase correspond to HeII 4686 ephemeris of Table 3. Note (3): The Signal-to-Noise ratio (SNR) is relative to the continuum and is measured in the range 4740-4750 angstroms.
Acknowledgements: Hugues Sana, hsana(at)
(End) Hugues Sana [ESO, Chile], Patricia Vannier [CDS] 11-May-2009
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