J/AJ/134/1916 Astrometric orbit of HR 6046 (Torres, 2007)
Hipparcos astrometric orbit and evolutionary status of HR 6046.
Torres G.
<Astron. J., 134, 1916-1922 (2007)>
=2007AJ....134.1916T 2007AJ....134.1916T
ADC_Keywords: Binaries, spectroscopic ; Positional data
Keywords: astrometry - binaries: general - binaries: spectroscopic -
methods: data analysis - stars: fundamental parameters -
stars: individual (HR 6046)
Abstract:
The previously known, 6yr single-lined spectroscopic binary HR 6046
has been speculated in the past to contain a compact object as the
secondary. A recent study has redetermined the orbit with great
accuracy and shown that the companion is an evolved but otherwise
normal star of nearly identical mass to the primary, which is also a
giant. The binary motion was detected by the Hipparcos mission but was
not properly accounted for in the published astrometric solution. Here
we use the Hipparcos intermediate data in combination with the
spectroscopic results to revise that solution and establish the
orbital inclination angle for the first time, and with it the
absolute masses MA=1.38+0.09-0.03M☉ and
MB=1.36+0.07-0.02M☉. Aided by other constraints, we
investigate the evolutionary status and confirm that the primary star
is approaching the tip of the red giant branch, while the secondary is
beginning its first ascent.
Objects:
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RA (2000) DE Designation(s)
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16 11 48.1 +36 25 30 HR 6046 = HIP 79358
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 49 78 Hipparcos intermediate astrometric data for HR 6046
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/A+A/464/377 : HIP binaries with radial velocities (Frankowski+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date of observation
14- 22 F9.4 yr ObsDate Date of observation in decimal years
24- 29 F6.4 --- Phase Orbital phase
31- 36 F6.2 mas DV Abscissa residual (1)
38- 41 F4.2 mas e_DV rms uncertainty on DV
43- 47 F5.2 mas O-C O-C for abscissa residual (1)
49 A1 --- Cons [NF] Consortium NDAC or FAST
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Note (1): Residuals from the standard five-parameter solution reported
in the catalog (Perryman et al., 1997, HIP, Cat. I/239). The five
standard parameters are the position (alpha0*, delta0) and
proper-motion components (pmRA*, pmDE) of the barycenter at the
reference epoch 1991.251 and the trigonometric parallax, pit. The
nominal errors of these measurements have a median value of 2.5mas.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Jan-2010