2009A&A...498..479F


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.25CET15:12:34

2009A&A...498..479F - Astronomy and Astrophysics, volume 498, 479-488 (2009/5-1)

Spectroscopic binaries among Hipparcos M giants. II. Binary frequency.

FRANKOWSKI A., FAMAEY B., VAN ECK S., MAYOR M., UDRY S. and JORISSEN A.

Abstract (from CDS):

This paper is the second in a series devoted to studying the properties of binaries with M giant primaries. The binary frequency of field M giants is derived and compared with the binary fraction of K giants. Diagrams of the CORAVEL spectroscopic parameter Sb (measuring the average line width) vs. radial-velocity standard deviation for our samples were used to define appropriate binarity criteria. These then served to extract the binarity fraction among the M giants. Comparison is made to earlier data on K giant binarity frequency. The Sb parameter is discussed in relation to global stellar parameters, and the Sb vs. stellar radius relation is used to identify fast rotators. We find that the spectroscopic binary detection rate among field M giants, in a sample with few velocity measurements (∼2), unbiased toward earlier known binaries, is 6.3%. This is less than half of the analogous rate for field K giants. This difference originates in the greater difficulty of finding binaries among M giants because of their smaller orbital velocity amplitudes and larger intrinsic jitter and in the different distributions of K and M giants in the eccentricity-period diagram. A higher detection rate was obtained in a smaller M giant sample with more radial velocity measurements per object: 11.1% confirmed plus 2.7% possible binaries. The CORAVEL spectroscopic parameter Sb was found to correlate better with the stellar radius than with either luminosity or effective temperature separately. Two outliers of the Sb vs. stellar radius relation, HD 190658 and HD 219654, have been recognised as fast rotators. The rotation is companion-induced, as both objects turn out to be spectroscopic binaries.

Abstract Copyright:

Journal keyword(s): binaries: spectroscopic - stars: late-type - stars: statistics

CDS comments: Note 2. Binary star J275 in the Hyades is Cl Melotte 25 275 in SIMBAD.

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* KN Cas s*r 00 09 36.3675084251 +62 40 04.119300189 11.79 11.21 9.49     M2Iep+B2.5III: 52 0
2 V* EG And Sy* 00 44 37.1876042586 +40 40 45.703033630 10.54 8.93 7.22     M2.4III 269 0
3 HD 5006 V* 00 52 38.0052011853 +45 08 00.235501456   9.02 7.48     K8III 13 0
4 HD 10696 ** 01 45 06.6479988408 +28 44 04.572923574   9.49 8.05     M5 12 0
5 V* GP Cas s*r 02 39 50.4398942442 +59 35 51.303381589 16.80 14.21 11.50     M2Iab 67 0
6 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2740 0
7 V* RR Cam Mi* 05 35 27.1679568815 +72 27 57.599828609   11.75 10.30     M5 22 0
8 HD 40282 * 05 57 54.4923625956 +01 13 27.521556141   7.707 6.202     K4III 29 0
9 V* WY Gem s*r 06 11 56.2500979400 +23 12 25.419490435 10.24 9.20 7.38 5.57 4.04 M2Iabep+B: 129 0
10 V* NP Gem LP? 07 02 25.5343620867 +17 45 19.872698564   7.57 5.94     M1 44 0
11 V* OV Cep LP* 07 40 30.4985248892 +87 01 12.383485125 8.67 6.70 5.07     M2III 62 0
12 HD 96572 V* 11 10 01.5845365016 +77 47 12.464639659   8.62 7.03     M0 17 0
13 HD 103945 V* 11 58 13.9301588047 +03 28 55.231536194   8.29 6.71     M0/1III 22 0
14 * 4 Dra SB* 12 30 06.6714652729 +69 12 03.989989948 8.38 6.57 4.95     M3+IIIa 121 0
15 V* NW Vir LP? 14 46 44.1656140777 +07 16 53.028061811   8.86 7.30     M5 14 0
16 V* T CrB Sy* 15 59 30.1619486506 +25 55 12.607985109   11.516 10.247 9.70   M3IIIe_sh 660 0
17 V* V934 Her LP* 17 06 34.5143100938 +23 58 18.652285813 11.20 9.16 7.62     M2III 121 0
18 V* V968 Her LP* 17 47 56.7065518031 +36 33 18.509783877   8.15 6.53     M0 18 0
19 V* CH Cyg Sy* 19 24 33.0697620341 +50 14 29.057625755 8.14 8.77 7.08   5.345 M7IIIab+Be 744 0
20 HD 190658 SB* 20 05 26.5459351888 +15 30 01.540770762 9.74 7.98 6.34     M2.5III 52 0
21 V* VV Cep Al* 21 56 39.1438495 +63 37 32.017439 7.03 6.65 4.90 3.19 1.85 M2epIa-Iab+B8:eV 432 1
22 V* V349 Peg LP* 23 17 19.1631093039 +29 52 24.131781187   8.81 7.17     M1III 13 0

    Equat.    Gal    SGal    Ecl

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2021.02.25-15:12:34

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