J/AJ/160/141 Astrometric measurements of * bet LMi (Wang+, 2020)
The improved orbit solution and component masses of bet LMi.
Wang X., Xia F., Fu Y.
<Astron. J., 160, 141 (2020)>
=2020AJ....160..141W 2020AJ....160..141W
ADC_Keywords: Stars, double and multiple; Positional data
Keywords: Binary stars ; Fundamental parameters of stars ; Visual binary stars ;
Spectroscopic binary stars
Abstract:
bet LMi is a double-lined visual binary with an orbital period of
∼39yr. Via a simultaneous fitting to both astrometric and radial
velocity measurements, we give a complete and improved orbit solution
with high precision. Then, the component masses are precisely
determined as 2.98±0.10M☉ and 1.92±0.04M☉ with a
relative precision of ∼3%, respectively. The orbital parallax is
determined to be 19.6±0.2mas, which is two times more precise than
Hipparcos parallax. With the known apparent magnitudes and magnitude
difference of the components, we derive the luminosity of the
components as 50.7±1.8L☉ and 9.1±4.1L☉. The estimated
radii of the components are 9.4±0.3R☉ and 3.7±1.5R☉.
Description:
We extract the relative astrometric measurements of the two components
from the Fourth Catalog of Interferometric Measurements of Binary
Stars (Hartkopf+, 2001).
Objects:
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RA (2000) DE Designation(s)
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10 27 53.00 +36 42 26.0 * bet LMi = HD 90537
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 61 80 The relative astrometric measurements, adopted
errors and residuals in the rectangular
coordinates
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See also:
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
J/AJ/106/1639 : Speckle observations of binary stars (McAlister+ 1993)
J/A+AS/105/503 : Binary star speckle measurements (Balega+ 1994)
J/AJ/108/2299 : ICCD speckle obs. of binary stars. XI. (Hartkopf+, 1994)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/A+A/341/121 : Visual binary orbits and masses (Soederhjelm 1999)
J/A+AS/141/371 : Low-mass stars evolut. tracks & isochrones (Girardi+,2000)
J/AJ/119/3084 : ICCD speckle obs. of binary stars. XXIII. (Hartkopf+, 2000)
J/AJ/119/1448 : Improved properties for cool stars (Houdashelt+, 2000)
J/AJ/127/1727 : Differential magnitudes of binary stars (Horch+, 2004)
J/AJ/135/209 : Rotational and RVs 761 HIP giants (Massarotti+, 2008)
J/MNRAS/395/907 : PISCO speckle observations in 2007 (Prieur+, 2009)
J/AJ/140/1579 : PHASES differential astrometry data (Muterspaugh+, 2010)
J/AJ/142/176 : Exoplanet host stars.II. Speckle interferometry (Mason+,2011)
J/AJ/149/110 : Radial velocities of 47 Oph (Wang+, 2015)
J/ApJ/817/40 : High-resolution NIR spectra of local giants (Feuillet+, 2016)
J/A+A/585/A73 : PTPS stars. III. The evolved stars sample (Niedzielski+,2016)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 yr Epoch [1935/2013] Besselian year of the epoch of
observation
11- 18 F8.5 arcsec x [-0.43/0.1] x position offset
20- 26 F7.5 arcsec e_x [0.001/0.05] Uncertainty in x
28- 35 F8.5 arcsec (O-C)x [-0.06/0.06] Residual in x
37- 44 F8.5 arcsec y [-0.44/0.09] y position offset
46- 52 F7.5 arcsec e_y [0.002/0.06] Uncertainty in y
54- 61 F8.5 arcsec (O-C)y [-0.06/0.05] Residual in y
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 13-Nov-2020