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J/AJ/154/200   The nearby white dwarf/red dwarf pair 40 Eri BC    (Mason+, 2017)

Binary star orbits. V. The nearby white dwarf/red dwarf pair 40 Eri BC. Mason B.D., Hartkopf W.I., Miles K.N. <Astron. J., 154, 200 (2017)> =2017AJ....154..200M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, double and multiple ; Binaries, orbits Keywords: binaries: general - binaries: visual - stars: individual (40 Eri BC) - techniques: interferometric Abstract: A new relative orbit solution with new dynamical masses is determined for the nearby white dwarf-red dwarf pair 40 Eri BC. The period is 230.29±0.68 years. It is predicted to close slowly over the next half-century, getting as close as 1.32" in early 2066. We determine masses of 0.573±0.018 M for the white dwarf and 0.2036±0.0064 M for the red dwarf companion. The inconsistency of the masses determined by gravitational redshift and dynamical techniques, due to a premature orbit calculation, no longer exists. Description: The pair is suitable for observation by the USNO speckle camera on the 26" refractor in Washington (Mason et al. 2011, J/AJ/141/157; 2011, J/AJ/142/46); at the suggestion of Howard Bond, the pair was repeatedly observed until it was too far off the meridian at twilight. Observed three times per night on six different nights, the calibration and methodology are as described in B. D. Mason & W. I. Hartkopf (2017AJ....154..183M). Measures used in the orbit solution (Section 3), from the Washington Double Star Catalog (Mason et al. 2001, Cat. B/wds) are presented in Table 3. Objects: ------------------------------------------------------- RA (ICRS) DE Designation(s) ------------------------------------------------------- 04 15 21.73 -07 39 17.4 40 Eri BC = * omi02 Eri C ------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 96 175 Catalog Measurements of 40 Eri BC
See also: B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014) J/AJ/123/1023 : Binary star orbits (Seymour+, 2002) J/A+A/486/843 : White dwarf-red dwarf binaries in the SDSS (Augusteijn+, 2008) J/AJ/141/157 : Speckle interferometry at USNO. XVI. (Mason+, 2011) J/AJ/142/46 : Speckle interferometry at USNO. XVII. (Mason+, 2011) J/AJ/153/20 : Speckle interferometry at USNO. XXI. (Mason+, 2017) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 9 F9.4 yr Epoch [1851.06/2016.129] Mean Julian epoch of observation (1) 11- 16 F6.2 deg theta [0.34/359.6] Position angle θ (2) 18- 22 F5.3 arcsec rho [1.3/9.71] Angular separation ρ 24- 25 I2 --- n [1/14] Number of nights in the mean position 27- 30 F4.1 deg (O-C)t [-8.8/6.1] The θ (O-C) residual 32- 37 F6.3 arcsec (O-C)r [-1.787/1.198] The ρ (O-C) residual 39- 42 F4.1 --- Weight [0/52.4] Observation weight 44- 70 A27 --- Ref Observation reference 72- 90 A19 --- BibCode BibCode, when available 92- 96 A5 --- Notes Additional notes (3)
Note (1): The measures listed have been converted to Julian epoch (JE), using the IAU approved conversion: JY=(BYx0.999978641)+0.041439661. Note (2): The position angles are for the equinox of the epoch of observation. Note (3): Note as follows: A = Measure given zero weight in final orbit solution due to excessive residuals; B = Measure by J. Gledhill cited by Lewis (1906MmRAS..56....1L); C = Measure uncertain or estimated by observer; D = Number of nights varies 50% or more between angle and separation measures. In this case, N=Nθ/Nρ, rounding down; E = Original data published at the Besselian Epoch converted to the Julian Epoch as described in the text; F = Identification error in publication corrected; G = Mean of multiple measures on the same photographic plate; H = Quadrant flipped 180° from published value; I = Measure given reduced weight in final orbit solution due to large residuals.
History: From electronic version of the journal References: Hartkopf et al. Paper I. 1999AJ....117.1023M Seymour et al. Paper II. 2002AJ....123.1023S, Cat. J/AJ/123/1023 Mason et al. Paper III. 2010AJ....140..242M Mason et al. Paper IV. 2010AJ....140..735M
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 17-Jul-2018
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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