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J/A+A/498/627    Radial velocities of SB with M giant    (Famaey+, 2009)

Spectroscopic binaries among Hipparcos M giants. I. Data, orbits, and intrinsic variations. Famaey B., Pourbaix D., Frankowski A., Van Eck S., Mayor M., Udry S., Jorissen A. <Astron. Astrophys. 498, 627 (2009)> =2009A&A...498..627F
ADC_Keywords: Binaries, spectroscopic ; Radial velocities ; Stars, late-type Keywords: stars: binaries: spectroscopic - stars: late-type - stars: AGB and post-AGB Abstract: This paper is a follow-up of the vast effort to collect radial velocity data for stars belonging to the Hipparcos survey. We aim at extending the orbital data available for binaries with M giant primaries. The data will be used in the companion papers of this series to (i) derive the binary frequency among M giants and compare it to that of K giants (Paper II, Frankowski et al., 2009A&A...498..479F), and (ii) analyse the eccentricity-period diagram and the mass-function distribution (Paper III, Jorissen et al., 2009A&A...498..489J). Keplerian solutions are fitted to radial-velocity data. However, for several stars, no satisfactory solution could be found, despite the fact that the radial-velocity standard deviation is larger than the instrumental error, because M giants suffer from intrinsic radial-velocity variations due to pulsations. We show that these intrinsic radial-velocity variations can be linked with both the average spectral-line width and the photometric variability. We present an extensive collection of spectroscopic orbits for M giants, with 12 new orbits, plus 17 from the literature. Moreover, to illustrate the fact that the large radial-velocity jitter present in Mira and semi-regular variables may easily be confused with orbital variations, we also present examples of pseudo-orbital variations (in S UMa, X Cnc and possibly in HD 115521, a former IAU radial-velocity standard). Because of this difficulty, M giants involving Mira variables were excluded from our monitored sample. We finally show that the majority of M giants detected as X-ray sources are actually binaries. Description: Table 2 lists the 254 stars belonging to sample II. This sample contains about one third of the northern M giants from the Hipparcos Catalogue. The radial velocity of these stars has been monitored with the CORAVEL and ELODIE spectrometers at the Observatoire de Haute Provence during the years 1991-1995, and at least 4 measurements were obtained. Table 2 provides the binarity diagnostic for each of these stars in terms of the radial-velocity standard error and standard deviation. Table 3 lists the individual radial-velocity measurements for the 35 stars of sample III. Sample III contains all stars from sample II with a radial-velocity standard deviation larger than 1km/s. Table 6 lists the 127 radial-velocity measurements of HD 115521, a former radial-velocity standard, now identified as a hierarchical triple system. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 13 17 36.3 +05 28 12 HD 115521 = * sig Vir ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 53 254 List of stars in sample II table3.dat 36 466 Individual radial-velocity measurements for stars in sample III table6.dat 24 127 Individual radial-velocity measurements of HD 115521
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 9- 10 I2 --- Nmeas Total number of measurements 14 I1 --- Nelo Number of ELODIE measurements 16- 22 F7.2 km/s RV Average radial velocity 26- 29 F4.2 km/s e_RV Radial-velocity standard deviation 32- 35 F4.2 km/s eRV Average error on one measurement 38- 42 F5.2 km/s Sb Average sigma of gaussian fitted to the cross- correlation profile, corrected for the instrumental width (7km/s) 44- 53 A10 --- Notes Orbit or jitter (1)
Note (1): Binary flag as follows: ORB = orbit available SB = binary with no orbit available yet SB/jitter? = SB or jitter? jitter = intrinsic radial-velocity jitter
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 8- 18 F11.3 --- JD Julian date 20- 26 F7.2 km/s RV Radial velocity 28- 31 F4.2 km/s e_RV Uncertainty on the radial velocity 34- 36 A3 --- Inst Spectrograph used, (COR = CORAVEL; ELO = ELODIE)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 11 F11.3 --- JD Julian date 14- 19 F6.2 km/s RV Radial velocity 21- 24 F4.2 km/s e_RV Uncertainity on the radial velocity
History: * 07-May-2009: original files * 10-June-2010: one value corrected in table2.dat * 30-July-2010: radial velocity corrected by the author in table2.dat for HD56031. Acknowledgements: Alain Jorissen, Alain.Jorissen(at)ulb.ac.be References: Frankowski et al., Paper II 2009A&A...498..479F Jorissen et al., Paper III 2009A&A...498..489J
(End) Alain Jorissen [ULB, Belgium], Patricia Vannier [CDS] 16-Mar-2009
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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