J/A+A/600/L9 NGC 1514 and LoTr 5 radial velocity curves (Jones+, 2017)
The long-period binary central stars of the planetary nebulae NGC 1514 and
LoTr 5.
Jones D., Van Winckel H., Aller A., Exter K., De Marco O.
<Astron. Astrophys. 600, L9 (2017)>
=2017A&A...600L...9J 2017A&A...600L...9J (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Planetary nebulae ; Radial velocities
Keywords: binaries: spectroscopic - stars: chemically peculiar -
planetary nebulae: individual: LoTr5 -
planetary nebulae: individual: NGC 1514 -
techniques: radial velocities
Abstract:
The importance of long-period binaries on the formation and evolution
of planetary nebulae is still rather poorly understood, in part due to
the lack of central star systems known to comprise such long-period
binaries. Here, we report on the latest results from the on-going
Mercator-HERMES survey for variability in the central stars of
planetary nebulae. We present a study of the central stars of
NGC 1514, BD+30 623, the spectrum of which shows features associated
with a hot nebular progenitor as well as a possible A-type companion.
Cross-correlation of high-resolution HERMES spectra against synthetic
spectra shows the system to be a highly eccentric (e∼0.5),
double-lined binary with a period of ∼3300 days. Previous studies
indicated that the cool component might be a Horizontal Branch star of
mass ∼0.55M☉ but the observed radial velocity amplitudes rule
out such a low mass. Assuming the nebular symmetry axis and binary
orbital plane are perpendicular, the data are more consistent with a
post-main-sequence star ascending towards the Giant Branch. We also
present the continued monitoring of the central star of LoTr 5,
HD 112313, which has now completed one full cycle, allowing the
orbital period (P∼2700-days) and eccentricity (e∼0.3) to be
derived. To date, the orbital periods of BD+30 623 and HD 112313 are
the longest to have been measured spectroscopically in the central
stars of planetary nebulae. Furthermore, these systems, along with
BD+33 2642, comprise the only spectroscopic wide-binary central
stars currently known.
Description:
Radial velocity measurements of the central stars of the PNe NGC 1514
and LoTr 5.
Objects:
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RA (2000) DE Designation(s) (file)
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12 55 33.75 +25 53 30.6 PN LoTr 5 = PN G339.9+88.4 (lotr5)
04 09 16.98 +30 46 33.6 NGC 1514 = PN G165.5-15.2 (ngc1514)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lotr5.dat 35 118 Radial velocity measurements of central star
of LoTr 5
ngc1514.dat 51 143 Radial velocity measurements of central stars
of NGC 1514
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See also:
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+, 1992)
V/127 : MASH Catalogues of Planetary Nebulae (Parker+ 2006-2008)
Byte-by-byte Description of file: lotr5.dat
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Bytes Format Units Label Explanations
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3- 17 F15.7 d BJD Barycentric Julian Date
21- 27 F7.3 km/s BRV Barycentric radial velocity
31- 35 F5.3 km/s e_BRV Uncertainty of radial velocity measurement
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Byte-by-byte Description of file: ngc1514.dat
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Bytes Format Units Label Explanations
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3- 17 F15.7 d BJD Barycentric Julian Date
21- 26 F6.3 km/s BRV1 Barycentric radial velocity of hot component
30- 34 F5.3 km/s e_BRV1 Uncertainty of radial velocity measurement
of hot component
38- 43 F6.3 km/s BRV2 Barycentric radial velocity of cold component
47- 51 F5.3 km/s e_BRV2 Uncertainty of radial velocity measurement
of cold component
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Acknowledgements:
David Jones, djones(at)iac.es
(End) David Jones [IAC, Spain], Patricia Vannier [CDS] 20-Mar-2017