J/A+A/617/A16 VY Scl reduced spectra & radial velocities (Schmidtobreick+, 2018)
Catching VY Sculptoris in a low state.
Schmidtobreick L., Mason E., Howell S.B., Long K.S., Pala A.F.,
Points S., Walter F.M.
<Astron. Astrophys. 617, A16 (2018)>
=2018A&A...617A..16S 2018A&A...617A..16S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, cataclysmic ; Radial velocities ; Spectra, optical
Keywords: accretion, accretion disks - binaries: spectroscopic -
novae, cataclysmic variables - stars: individual: VY Scl
Abstract:
In the context of a large campaign to determine the system parameters
of high mass transfer cataclysmic variables, we found VY Scl in a low
state in 2008.
Making use of this low state, we study the stellar components of the
binary with little influence of the normally dominating accretion
disc.
Time-resolved spectroscopy and photometry of VY Scl taken during the
low state are presented. We analysed the light-curve and radial
velocity curve and use time-resolved spectroscopy to calculate Doppler
maps of the dominant emission lines.
The spectra show narrow emission lines of Halpha, Hbeta, HeI, NaI D,
and FeII, as well as faint TiO absorption bands that trace the motion
of the irradiated secondary star, and Halpha and HeI emission line
wings that trace the motion of the white dwarf. From these radial
velocities, we find an orbital period of 3.84h, and put constraints on
binary parameters such as the mass ratio M2/M1 of 0.43 and the
inclination of 15. With a secondary mass between 0.3 and 0.35M☉,
we derive the mass for the white dwarf as M1=0.6-1.1M☉.
Description:
Reduced and normalised time series spectra of VY Scl and measured
radial velocities are given for 27 September 2008 and 18 November
2008. Both epochs are in a low state of VY Scl.
Objects:
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RA (2000) DE Designation(s)
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23 29 00.48 -29 46 45.9 VY Scl = CSV 8857
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hjd.dat 30 83 HJD and corresponding spectrum
rvnad.dat 21 42 NaD lines averaged RVs
rvtio.dat 19 14 TiO band feature at 7055.8Å relative RVs
rvfeii.dat 32 21 FeII λ5169Å radial velocities
rvhe5876.dat 32 62 HeI λ5876Å radial velocities
rvhe6675.dat 32 62 HeI λ6675Å radial velocities
rvhe7065.dat 32 60 HeI λ7065Å radial velocities
rvha1.dat 33 62 Hα (1st epoch) radial velocities
rvha2.dat 37 21 Hα (2nd epoch) radial velocities
rvhb.dat 37 21 Hβ radial velocities
fits/* . 83 Individual fits spectra
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Byte-by-byte Description of file: hjd.dat
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Bytes Format Units Label Explanations
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1- 17 F17.9 d HJD Heliocentirc Julian date of observation
20- 30 A11 --- FileName Name of the spectrum file in subdirectory fits
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Byte-by-byte Description of file: rvnad.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentirc Julian date
16- 21 F6.2 km/s RV Average radial velocity
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Byte-by-byte Description of file: rvtio.dat
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Bytes Format Units Label Explanations
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2- 5 F4.2 --- Phase Phase
9- 13 F5.1 km/s RV Relative radial velocity
16- 19 F4.1 km/s e_RV rms uncertainty on RV
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Byte-by-byte Description of file: rvfeii.dat rvhe*.dat rvha?.dat rvhb.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d HJD Heliocentric Julian date
18- 27 F10.6 km/s RV Radial velocity
29- 37 F9.6 km/s e_RV rms uncertainty on RV
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Acknowledgements:
Linda Schmidtbreick, lschmidt(at)eso.org
(End) Patricia Vannier [CDS] 01-Jun-2018