J/AJ/129/1001 Radial velocities of HD 166181 (Fekel+, 2005)
HD 166181 = V815 Herculis, a single-lined spectroscopic multiple system.
Fekel F.C., Barlow D.J., Scarfe C.D., Jancart S., Pourbaix D.
<Astron. J., 129, 1001-1007 (2005)>
=2005AJ....129.1001F 2005AJ....129.1001F
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: binaries: spectroscopic - stars: fundamental parameters -
stars: variables: other
Abstract:
We have obtained extensive spectroscopic and velocity spectrometer
observations of HD166181, a previously known single-lined
spectroscopic binary. Our improved orbit for the G6 V primary has a
period of 1.8098343days and is circular. Although the lines of
additional components have not been detected, radial velocity
measurements confirm that the system has additional velocity
variations with a period of 2092days, or 5.73yr. This long-period
orbit has an eccentricity of 0.76. An analysis of the Hipparcos
observations produces a well-determined astrometric orbit for the
long-period system that has an inclination of 78°. Mass estimates
of the components in this zero-age main-sequence multiple system
indicate that the unseen secondary in the 5.73yr orbit may also be a
binary. Thus, HD 166181 is at least a triple system and possibly
quadruple.
Description:
In 1984 we obtained two spectrograms of HD166181 at the Kitt Peak
National Observatory (KPNO) with the coude feed telescope, coude
spectrograph, and a TI CCD detector. A hiatus of 10yr ensued before we
resumed observations at KPNO in 1994 September. Through 2003 October
we obtained an additional 58 spectrograms. All but two of the 60 KPNO
spectrograms are centered in the red at 6430Å, cover a wavelength
range of about 80Å, and have a resolution of 0.21Å. The
remaining two are centered at 6700Å. The spectra have typical
signal-to-noise (S/N) ratios of 150-200. All the KPNO velocities are
listed in Table1.
From 2003 May through October additional observations were acquired at
the Dominion Astrophysical Observatory (DAO). Twelve radial
velocities, listed in Table1, were obtained with the DAO 1.2m
telescope, coude spectrograph, and radial velocity scanner.
In addition to the above two data sets, three others are listed in
Table1. Included are the five David Dunlap Observatory (DDO)
velocities of Heard 1956PDDO....2..107H 1956PDDO....2..107H, the 18 Haute-Provence
Observatory (OHP) velocities of Nadal et al. 1974A&A....37..191N 1974A&A....37..191N, and
the 13 KPNO velocities of Dempsey et al. 1996AJ....111.1356D 1996AJ....111.1356D.
Objects:
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RA (2000) DE Designation(s) (Period)
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18 08 16.0 +29 41 28 HD 166181 = V* V815 Her (P=1.80983433)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 108 Radial velocities of HD 166181
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See also:
J/A+A/362/223 : 1984-1998 BV photometry of V815 Her (Jetsu+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Heliocentric Julian Date
13- 18 F6.3 d DelT [-0.001/0.015] Light time correction
20- 24 F5.3 --- LPhase [0/1] Phase in the long-period orbit (ΦL)
26- 30 F5.3 --- SPhase [0/1] Phase in the short-period orbit (ΦS)
32- 36 F5.1 km/s RV [-70.7/57.2] Radial velocity
38 A1 --- f_RV [a] Flag on RV (a=lithium region) (1)
40- 44 F5.1 km/s O-C [-15.9/15.7] The radial velocity residual
46- 49 F4.2 --- w_RV [0/1] Weight of RV
51- 54 A4 --- Obs Observatory code (DDO, DAO, OHP, or KPNO) (2)
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Note (1): "a" indicates a lithium region, central wavelength 6700Å.
Note (2): Observatory code, defined as below:
DDO = David Dunlap Observatory;
DAO = Dominion Astrophysical Observatory;
OHP = Haute-Provence Observatory;
KPNO = Kitt Peak National Observatory.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 27-Jul-2005