J/AJ/131/1702 Radial velocities for the HD 27638B components (Torres+, 2006)
The multiple system HD 27638.
Torres G.
<Astron. J., 131, 1702-1711 (2006)>
=2006AJ....131.1702T 2006AJ....131.1702T
ADC_Keywords: Stars, double and multiple ; Binaries, spectroscopic ;
Radial velocities
Keywords: binaries: spectroscopic - binaries: visual -
stars: individual (HD 27638) - stars: late-type -
techniques: radial velocities - techniques: spectroscopic
Abstract:
We report spectroscopic observations of HD 27638B, the secondary in a
visual binary in which the physically associated primary (separation
∼19") is a B9 V star. The secondary shows strong Liλ6708
absorption, suggesting youth, and has attracted attention in the past
as a candidate post-T Tauri star, although this has subsequently been
ruled out. It was previously known to be a double-lined spectroscopic
binary (F8+G6) with a period of 17.6days and to show velocity
residuals indicating a more distant massive third companion with a
period of at least 8yr.
Description:
Spectroscopic observations of HD 27638B were conducted at the Center
for Astrophysics (CfA) between 1988 September and 2004 December (with
a 6yr gap from 1990 March to 1996 November), mostly with an echelle
spectrograph on the 1.5m Wyeth reflector at the Oak Ridge Observatory
(Harvard, Massachusetts). Occasional observations were also made with
nearly identical instruments on the 1.5m Tillinghast reflector at the
F. L. Whipple Observatory (Mount Hopkins, Arizona) and the MMT
Observatory (also on Mount Hopkins, Arizona).
Objects:
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RA (2000) DE Designation(s)
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04 22 34.9 +25 37 46 HD 27638 = * chi Tau
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 72 CfA radial velocity measurements for HD 27638B
in the heliocentric frame
table3.dat 77 79 RVM (Radial Velocity Meter) measurements for
HD 27638B in the heliocentric frame
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See also:
J/A+A/382/118 : Spectroscopic sub-systems in multiple stars (Tokovinin+, 2002)
J/A+A/374/227 : Radial velocity in multiple systems (Tokovinin+, 2001)
J/A+A/379/162 : Binaries with post-T Tauri secondaries (Gerbaldi+, 2001)
Byte-by-byte Description of file: table1.dat table3.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
14- 21 F8.3 yr Obs.Y Year of observation
23- 28 F6.2 km/s RVBa ? Radial velocity of the Ba component
30- 33 F4.2 km/s e_RVBa ? The 1σ error in RVBa
35- 39 F5.2 km/s (O-C)Ba ? Velocity residual of the Ba component
41- 46 F6.2 km/s RVBb ? Radial velocity of the Bb component
48- 51 F4.2 km/s e_RVBb ? The 1σ error in RVBb
53- 57 F5.2 km/s (O-C)Bb ? Velocity residual of the Bb component
59- 63 F5.3 --- IPhase Inner orbit phase
65- 69 F5.3 --- OPhase Outer orbit phase
71- 77 F7.4 d DelT Light travel time correction
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 17-Feb-2007