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J/AJ/131/2986           Multiplicity of contact binaries       (Pribulla+, 2006)

Contact binaries with additional components. I. The extant data. Pribulla T., Rucinski S.M. <Astron. J., 131, 2986-3007 (2006)> =2006AJ....131.2986P
ADC_Keywords: Stars, double and multiple ; Stars, variable ; Binaries, eclipsing Keywords: binaries: close - binaries: eclipsing - stars: variables: other Abstract: We have attempted to establish observational evidence for the presence of distant companions that may have acquired and/or absorbed angular momentum during the evolution of multiple systems, thus facilitating or enabling the formation of contact binaries. In this preliminary investigation we use several techniques (some of them distance- independent) and mostly disregard the detection biases of individual techniques in an attempt to establish a lower limit to the frequency of triple systems. While the whole sample of 151 contact binary stars brighter than Vmax=10mag gives a firm lower limit of 42%±5%, the corresponding number for the much better observed northern-sky subsample is 59%±8%. These estimates indicate that most contact binary stars exist in multiple systems. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 111 181 Multiplicity of contact binary stars: summary data table3.dat 80 72 Notes on selected contact binaries
See also: B/wds : The Washington Visual Double Star Catalog I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) II/250 : Combined General Catalogue of Variable Stars (Samus+ 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name The General Catalog of Variable Stars name (Cat. II/250) (1) 11 A1 --- n_Name [*] Indicates a note detailed in table3 13- 17 F5.2 mag Vmag Johnson or transformed Hipparcos Hp maximum magnitude 19- 28 A10 --- WDS Washington Double Star catalogue designation (Cat. B/wds) (2) 30- 32 I3 deg PA ? Position angle of the secondary/fainter component 34- 38 F5.2 arcsec Sep ? Angular separation of the components (3) 40- 44 I5 AU d ? Projected separation (4) 46 A1 --- f_d [*] Flag for large uncertainty on d (5) 48- 51 F4.2 mag DelV ? Visual brightness difference of components (6) 53 A1 --- H59 [CGX] Hipparcos multiple system flag H59 (7) 54 A1 --- H61 [ABCS] Hipparcos solution quality flag H61 (8) 56- 59 F4.2 mas e_pi ? Hipparcos parallax error 61- 64 F4.2 mas/yr e_mu ? Proper-motion error in TYCHO 2 catalog (Cat. I/259) (9) 66- 69 F4.2 --- beta ? Ratio of apparent luminosities (10) 71- 73 I3 km/s dRV ? Difference of third component velocity and systemic velocity of the underlying binary 75 A1 --- f_dRV [vs] Flag on dRV variability (11) 77- 78 I2 --- P3 ? Orbital period of the third component as determined from LITE 80- 82 F3.1 AU asin(i) ? Projected semi-major axis of the eclipsing pair (12) 84- 88 F5.2 mag dB-V ? Difference between TYCHO-2 B-V color and the short-period, blue envelope (SPBE) (see the text) 90- 94 F5.2 [-] logFX/Fbol ? Log of the RASS X-ray flux to the bolometric flux (see Section 4.3) 96 A1 --- Occ [M] Indicates a Moon occultation (13) 98 A1 --- F1 [DPN] Visual binary present in the WDS catalog flag (14) 99 A1 --- F2 [DPN-] CFHT Adaptative Optics observations flag (14) 100 A1 --- F3 [DSN-] Hipparcos Catalog flags (15) 101 A1 --- F4 [SN-] σµ flag (16) 102 A1 --- F5 [DSN-] Spectroscopic detection (17) 103 A1 --- F6 [DSN-] Light-time effect (LITE) indication (18) 104 A1 --- F7 [SN-] Short-period, blue envelope (SPBE) indication (19) 105 A1 --- F8 [LEN] RASS (IX/10,IX/29) X-ray to visual flux ratio flag (20) 107-109 F3.1 --- W Combined weight (21) 111 A1 --- T3 [Y] Final evaluation of triplicity (22)
Note (1): Systems without GCVS designations: V2 Mon = TYC 4824-00153-1, V3 Mon = TYC 4835-01947-1, V2 Peg = TYC 1720-00658-1. Note (2): Designation of the system (if it is visual binary or common proper-motion pair) in the most recent on-line version of the catalog ( or CFHT indicating a new detection, as given in Table 4. Note (3): Angular separation of components of LL Vel is <0.03". Note (4): Computed from angular separation and Hipparcos parallax. Note (5): A "*" indicates a relative error of parallax larger than 0.2 or a negative parallax, the distance estimated using absolute magnitude calibration of Rucinski & Duerbeck (1997PASP..109.1340R) or estimated otherwise (see text). Note (6): Visual brightness difference of components of ES Lib is not given in the WDS catalogue. Note (7): H59 Hipparcos flag represents the type of astrometric solution, defined as follows: C = linear motion, G = acceleration term necessary (i.e. very probably an astrometric binary) X = stochastic solution (i.e. very probably an astrometric binary with P<3years); Note (8): H61 Hipparcos flag represents the quality of the orbital solution: grades ABCD (A=best) or suspected non-single flag S. Note (9): e_mu = sqrt[(σ(µα)cos(δ)22δ)]. Note (10): l3/(l1+l2) determined from broadening functions (see the text). Note (11): Flag on DelRV as follows: v = variable velocity; s = similar velocity. Note (12): Around the common center of gravity determined using the LITE. Note (13): Occultation within 5°9' from the ecliptic. Note (14): Flags as follows: D = for systems with projected separation less than 2000AU, P = for systems with separation between 2000 and 20000AU, N = system not present in WDS or with separation larger than 20000AU. - = system not observed. Note (15): Hipparcos Catalog flags as follows: N = no detection - = not observed or insufficient data D = if X or G in H59, S = if S or C in H61. (Three systems not recognized before as the "S" cases, but having parallax errors larger than 3σ relative to the error median, have been added here: UX Eri, V1363 Eri, DY Cet.) Note (16): The proper-motion error is defined as follows: S = if proper-motion error higher than 3-σ from the median. N = no detection - = not observed or insufficient data Note (17): Spectroscopic detection as follows: D = detection in broadening functions or through spectral features N = no detection in broadening functions or through spectral features - = not observed or insufficient data S = large changes of systemic velocity Note (18): LITE indication, defined as follows: D = a stable orbit with more than 1.5 cycles covered, S = a somewhat unstable solution or less than 1.5 cycles covered, N = no detection - = fewer than 25 pe or CCD minima or the interval of observations <10yr. Note (19): SPBE indication, defined as follows: S = if the system is bluer than the corresponding blue envelope color. N = no detection - = not observed or insufficient data Note (20): RASS X-ray to visual flux ratio, defined as follows: L = when a late-type companion is indicated by a large logX ratio in an early-type contact binary, E = when the ratio is below the lower envelope of detection limit indicating an early-type third component. N = no detection Note (21): The sum of weights of individual detection techniques (any detection counts with weight 1.0, any possibility or suspicion with 0.5) Note (22): A "Y" (=Yes) indicates the sum of weights is ≥ 1.0
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name The General Catalog of Variable Stars name (Cat. II/250) 11- 80 A70 --- Note Text of note
History: From electronic version of the journal References: D'Angelo et al., Paper II 2006AJ....132..650D Rucinski et al., Paper III 2007AJ....134.2353R
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 16-Jul-2008
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