J/MNRAS/508/2226 Binary central star of V510 Pup (Manick+, 2021)
The binary central star of the bipolar pre-planetary nebula IRAS 08005-2356
(V510 Pup).
Manick R., Miszalski B., Kamath D., Whitelock P.A., Van Winckell H.,
Hrivnak B.J., Barlow B.N., Mohamed S.
<Mon. Not. R. Astron. Soc. 508, 2226-2235 (2021)>
=2021MNRAS.508.2226M 2021MNRAS.508.2226M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, peculiar ; Infrared sources ;
Radial velocities ; Photometry, infrared
Keywords: techniques: photometric - techniques: spectroscopic -
stars: AGB and post-AGB - binaries: spectroscopic - stars: evolution -
stars: jets - stars: individual: V510 Pup
Abstract:
Current models predict that binary interactions are a major ingredient
in the formation of bipolar planetary nebulae (PNe) and pre-planetary
nebulae (PPNe). Despite years of radial velocity (RV) monitoring, the
paucity of known binaries amongst the latter systems means data are
insufficient to examine this relationship in detail. In this work, we
report on the discovery of a long-period (P=2654±124d) binary at the
centre of the Galactic bipolar PPN IRAS 08005-2356 (V510 Pup),
determined from long-term spectroscopic and near-infrared time-series
data. The spectroscopic orbit is fitted with an eccentricity of
0.36±0.05, which is similar to that of other long-period post-AGB
binaries. Time-resolved Hα profiles reveal high-velocity
outflows (jets) with deprojected velocities up to 231+31-27km/s
seen at phases when the luminous primary is behind the jet. The
outflow traced by Hα is likely produced via accretion on to a
main-sequence companion, for which we calculate a mass of
0.63±0.13M☉. This discovery is one of the first cases of a
confirmed binary PPN and demonstrates the importance of
high-resolution spectroscopic monitoring surveys using large
telescopes in revealing binarity among these systems.
Description:
We obtained 23 observations of IRAS 08005-2356 from 2017-2021
using SALT High-Resolution Spectroscopy (HRS), which is a dual-beam,
fibre-fed echelle spectrograph.
We gathered an additional 32 medium-resolution long-slit spectra
(R∼27500) from the Small and Medium Aperture Research Telescope System
(SMARTS) 1.5-m telescope at the Cerro Tololo Inter-American
Observatory (CTIO). These were recorded between 2014 and 2018 using
the fibre-fed CHIRON echelle spectrometer, which collects light
through a 2.7-arcsec on-sky aperture.
Another two long-slit echelle spectra were obtained from the William
Herschel Telescope (WHT) and the Very Large Telescope (VLT). The WHT
observations were performed on 1994 March 1 using the Utrecht Echelle
Spectrograph (UES: R=110000), which has an on-sky aperture size
of 1.1arcsec. The two-dimensional WHT spectra were reduced following
the standard procedure for echelle spectroscopy using iraf
astronomical routines. The radial velocity resolution achieved in our
spectra was ∼1.4km/s at a wavelength of 7771Å.
Near-infrared JHKL photometry (Table 2) was obtained from the South
African Astronomical Observatory (SAAO) as part of programme
investigating variability in IRAS sources (e.g. Whitelock & Feast,
1984MNRAS.210p..25W 1984MNRAS.210p..25W; Menzies & Whitelock, 1988MNRAS.233..697M 1988MNRAS.233..697M).
Regular monitoring was performed for 16 years from 1990-2005 with
the MkII infrared photometer on the 0.75-m telescope at SAAO
Sutherland. This uses a single-channel InSb detector and a 34-arcsec
aperture, which encloses the resolved nebula in its entirety. The
final isolated observation was obtained in 2010, also on the 0.75-m,
about 24 years after the first. The photometry, listed in Table 2, is
on the SAAO system as described by Carter (1990MNRAS.242....1C 1990MNRAS.242....1C) and
the uncertainty in the JHK and L bands is 0.02 and 0.05mag,
respectively.
Heliocentric radial velocities, with uncertainties, and the Julian
Date on which they were measured, for V510 Pup. Infrared (JHKL)
photometry, for V510 Pup, on the SAAO System (Carter,
1990MNRAS.242....1C 1990MNRAS.242....1C) and the Julian Date (-2440000) on which the
observation was made. The uncertainty on the photometry is 0.02mag at
JHK and 0.05mag at L.
Objects:
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RA (2000) DE Designation(s)
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08 02 40.70 -24 04 42.6 V510 Pup = IRAS 08005-2356
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 23 57 Radial velocities of IRAS 08005-2356
table2.dat 31 58 JHKL photometry for IRAS 08005-2356
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See also:
J/AZh/81/333 : Spectral analysis of V510 Pup (Klochkova+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 d JD Heliocentric Julian date
13- 17 F5.2 km/s HRV Heliocentric radial velocity
20- 23 F4.2 km/s e_HRV Heliocentric radial Velocity uncertainty
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.2 d JD Julian Date (JD-2440000)
10- 13 F4.2 mag Jmag J magnitude (uncertainty is 0.02mag)
16- 19 F4.2 mag Hmag H magnitude (uncertainty is 0.02mag)
22- 25 F4.2 mag Kmag K magnitude (uncertainty is 0.02mag)
28- 31 F4.2 mag Lmag L magnitude (uncertainty is 0.05mag)
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Acknowledgements:
Patricia Whitelock, paw(at)saao.ac.za
(End) Patricia Whitelock [SAAO, South Africa] Patricia Vannier [CDS] 25-Oct-2021