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 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 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 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 2009A&A...498..479F
Jorissen et al., Paper III 2009A&A...498..489J 2009A&A...498..489J
(End) Alain Jorissen [ULB, Belgium], Patricia Vannier [CDS] 16-Mar-2009