J/AJ/165/203 CHIRON radial velocities of 5 Be+sdO binaries (Wang+, 2023)
The Orbital and Physical Properties of Five Southern Be+sdO Binary Systems.
Wang L., Gies D.R., Peters G.J., Han Z.
<Astron. J., 165, 203 (2023)>
=2023AJ....165..203W 2023AJ....165..203W
ADC_Keywords: Stars, double and multiple; Spectra, optical; Radial velocities
Keywords: Stellar evolution ; Spectroscopic binary stars ; Emission line
stars
Abstract:
Close binary interactions may play a critical role in the formation of
the rapidly rotating Be-stars. Mass transfer can result in a mass
gainer star spun up by the accretion of mass and angular momentum,
while the mass donor is stripped of its envelope to form a hot and
faint helium star. Far-UV spectroscopy has led to the detection of
about 20 such binary Be+sdO systems. Here we report on a 3yr program
of high-quality spectroscopy designed to determine the orbital periods
and physical properties of five Be-binary systems. These binaries are
long orbital period systems with P=95-237days and small semiamplitude
K1<11km/s. We combined the Be star velocities with prior sdO
measurements to obtain mass ratios. A Doppler tomography algorithm
shows the presence of the HeIIλ4686-line in the faint spectrum
of the hot companion in four of the targets. We discuss the observed
line variability and show evidence of phase-locked variations in the
emission profiles of HD157832, suggesting a possible disk spiral
density wave due to the presence of the companion star. The stripped
companions in HD113120 and HD137387 may have a mass larger than
1.4M☉, indicating that they could be progenitors of Type Ib and Ic
supernovae.
Description:
The spectra of five southern Be targets were obtained with the high
resolving power echelle spectrometer CHIRON installed on the Small and
Moderate Aperture Research Telescope System (SMARTS) 1.5m telescope at
the Cerro Tololo Inter-American Observatory in Chile. The spectra were
collected between 2018 April 23 and 2021 July 23 through the queue
observing mode using the image slicer with a spectral resolving power
R=80000. The spectra are recorded in 59 echelle orders covering a
wavelength range from 4150 to 8800Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 5 Spectroscopic program targets
table2.dat 44 234 *Radial velocity measurements of the Be stars
tableb1.dat 51 44 Relative RVs for HD 113120
tableb2.dat 27 96 RVs for HD 152478 and HD 157042 from Hb
tableb3.dat 136 93 RVs for HD 137387 and HD 157832
tablec2.dat 119 230 Equivalent width measurements
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Note on table2.dat : The RV measured from the spectrum observed on the
night of HJD2458232.6079 for HD113120 was given a zero weight and
excluded from the orbital fit due to its large deviation from the
derived orbital solution. Five RVel measurements made between
2458526.8796 and 2458544.8841 were excluded from the orbital fit for
HD137387. Seven RVel measurements made between 2458635.8236 and
2458667.6724 were excluded from the orbital fit for HD157832.
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See also:
J/A+A/385/488 : Search for duplicity in periodic Be stars (Carrier+, 2002)
J/A+A/387/580 : UBV photometry of V832 Cyg (Harmanec+, 2002)
J/MNRAS/371/252 : Southern B and Be stars (Levenhagen+, 2006)
J/ApJ/686/1280 : Discovery of hot subdwarf companion to FYCMa (Peters+, 2008)
J/AN/331/349 : O, Btype & red supergiant masses & luminosity (Hohle+, 2010)
J/MNRAS/410/190 : Young runaway stars within 3kpc (Tetzlaff+, 2011)
J/A+A/545/A121 : ο Puppis spectra (Koubsky+, 2012)
J/A+A/537/A59 : Radial velocities of gamma Cas (Nemravov+, 2012)
J/ApJ/765/2 : FUV radial velocities of 59 Cyg (Peters+, 2013)
J/A+A/567/A57 : HD 161306 Hα and HeI spectra (Koubsky+, 2014)
J/ApJ/828/47 : Radial velocities of the Be star HR 2142 (Peters+, 2016)
J/A+A/595/A132 : Be star rotational velocities distribution (Zorec+, 2016)
J/MNRAS/474/5287 : BeSOS Be stars stellar parameters (Arcos+, 2018)
J/A+A/629/A134 : Radiative contribution from stripped stars (Goetberg+, 2019)
J/ApJ/899/132 : Adiabatic Mass Loss in Binary Stars. III. (Ge+, 2020)
J/A+A/639/L6 : HERMES spectra of LS V +22 25 (Shenar+, 2020)
J/ApJS/254/42 : Hipparcos-Gaia EDR3 Catalog of Accelerations (Brandt, 2021)
J/AJ/162/176 : The solar neighborhood. XLVIII. (Paredes+, 2021)
J/A+A/666/A136 : V1294 Aql radial velocities and photometry (Harmanec+, 2022)
J/A+A/669/A45 : Mass transfer post-mainsequence donor stars (Temmink+, 2023)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD Stellar Henry Drapper identifier
8- 18 A11 --- Name Stellar name
20- 24 I5 --- HIP HIP identifier
26- 29 F4.2 mag Vmag [5.25/6.66] V-band magnitude
31- 38 A8 --- SpT Spectral classification
40 I1 --- Ref [1/3] Reference used (1)
42- 43 I2 --- Nspec [45/49] Number of spectra
45- 55 A11 --- Obs-b Beginning of observation begin
57- 67 A11 --- Obs-e Observation end
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Note (1): References as follows:
1 = Levenhagen+, 2006, J/MNRAS/371/252
2 = Slettebak, 1982ApJS...50...55S 1982ApJS...50...55S
3 = Lopes+, 2011ApJ...731L...6L 2011ApJ...731L...6L
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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- 6 I6 --- HD HD Star Name
8- 17 F10.4 d HJD [58232/59417] Observation date; HJD-2400000
19- 23 F5.3 --- Phase [0.002/1] Orbital Phase (1)
25- 29 F5.1 km/s RVel [-26.8/47.2] Radial Velocity
31- 33 F3.1 km/s e_RVel [0.3/6] Error on RVel
35- 39 F5.1 km/s O-C [-16.6/22.2]? O-C residual
41- 44 A4 --- Line Line profile used for RVel measurement (2)
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Note (1): The orbital phase of each measurement is obtained from the
SB2 fits of the associated target star, except in the case of
HD157832, in which the orbital phases are from the SB1 fit.
Note (2): Ha profiles were used to measure the RVs of the target
stars except for the case of HD137387, where the HeI 5875.67
profile was chosen for measurement.
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d HJD [58482/59324] Observation date; HJD-2400000
12- 16 F5.1 km/s RVela [-20.7/6.6] RV (Hb)
18- 20 F3.1 km/s e_RVela [0.6/1.4] Error of RVel-a
22- 26 F5.1 km/s RVelb [-19.2/8.5]? RV (Fe II 5276,5316)
28- 30 F3.1 km/s e_RVelb [0.3/0.9]? Error of RVel-b
32- 36 F5.1 km/s RVelc [-19.1/5.8]? RV (Fe II 5316,5362)
38- 40 F3.1 km/s e_RVelc [0.3/1.3]? yError of RVel-c
42- 46 F5.1 km/s RVeld [-27.6/16.0]? RV (Fe II 8451)
48- 51 F4.2 km/s e_RVeld [0.3/1.4]? Error of RVel-d
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD [152478/157042] HD Star Name
8- 17 F10.4 d HJD [58536/59417] Observation date; HJD-2400000
19- 22 F4.1 km/s RVel [-4.8/14.3] Radial Velocity
24- 27 F4.2 km/s e_RVel [0.4/2.9] Error of Rvel
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Byte-by-byte Description of file: tableb3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD [137387/157832] HD Star Name
8- 17 F10.4 d HJD [58496/59413] Observation date; HJD-2400000
19- 23 F5.1 km/s RVela [-34.6/72.0] Radial Velocity (Hb 4861)
25- 27 F3.1 km/s e_RVela [0.4/2.1] Error of Rvel-a
29- 33 F5.1 km/s RVelb [-94.1/22.9]? Radial Velocity (HeI 4713)
35- 37 F3.1 km/s e_RVelb [0.5/3.3]? Error of Rvel-b
39- 43 F5.1 km/s RVelc [-51.2/33.8] Radial Velocity (HeI 4921)
45- 47 F3.1 km/s e_RVelc [0.3/1.6] Error of Rvel-c
49- 53 F5.1 km/s RVeld [-68.9/32.3] Radial Velocity (HeI 5015)
55- 57 F3.1 km/s e_RVeld [0.4/2.0] Error of Rvel-d
59- 63 F5.1 km/s RVele [-24.2/2.9]? Radial Velocity (FeII 5197)
65- 67 F3.1 km/s e_RVele [1.1/6.2]? Error of Rvel-e
69- 73 F5.1 km/s RVelf [-18.8/15.4]? Radial Velocity (FeII 5234)
75- 77 F3.1 km/s e_RVelf [0.8/3.7]? Error of Rvel-f
79- 82 F4.1 km/s RVelg [-0.4/26.2]? Radial Velocity (FeII 5276)
84- 86 F3.1 km/s e_RVelg [0.6/2.5]? Error of Rvel-g
88- 92 F5.1 km/s RVelh [-11.8/11.4]? Radial Velocity (FeII 6456)
94- 96 F3.1 km/s e_RVelh [0.2/0.6]? Error of Rvel-h
98-102 F5.1 km/s RVeli [-47.1/34.5]? Radial Velocity (HeI 6678)
104-106 F3.1 km/s e_RVeli [0.3/2.0]? Error of Rvel-i
108-112 F5.1 km/s RVelj [-33.5/103.8]? Radial Velocity (HeI 7065)
114-116 F3.1 km/s e_RVelj [0.2/0.8]? Error of Rvel-j
118-122 F5.1 km/s RVelk [-14.7/7.5]? Radial Velocity (OI 8446)
124-126 F3.1 km/s e_RVelk [0.2/1.1]? Error of Rvel-k
128-131 F4.1 km/s RVell [3.0/31.0]? Radial Velocity (Ca II 8542)
133-136 F4.2 km/s e_RVell [0.3/1.8]? Error of Rvel-l
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Byte-by-byte Description of file: tablec2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD [113120/157832] HD Star Name
8- 17 F10.4 d HJD [58482/59417] Observation date; HJD-2400000
19- 25 F7.3 0.1nm EWa [-24.271/2.665] Equivalent Width (Ha)
27- 31 F5.3 0.1nm e_EWa [0.011/0.064] Error of EW-a
33- 38 F6.3 0.1nm EWb [-2.373/2.428] Equivalent Width (Hb)
40- 44 F5.3 0.1nm e_EWb [0.005/0.047] Error of EW-b
46- 50 F5.3 0.1nm EWc [0.482/1.075]? Equivalent Width (He I 4921)
52- 56 F5.3 0.1nm e_EWc [0.005/0.017]? Error of EW-c
58- 62 F5.3 0.1nm EWd [0.128/0.559]? Equivalent Width (He I 5015)
64- 68 F5.3 0.1nm e_EWd [0.006/0.009]? Error of EW-d
70- 74 F5.3 0.1nm EWe [0.75/1.693]? Equivalent Width (He I 5875)
76- 80 F5.3 0.1nm e_EWe [0.026/0.035]? Error of EW-e
82- 87 F6.3 0.1nm EWf [-0.226/1.48]? Equivalent Width (He I 6678)
89- 93 F5.3 0.1nm e_EWf [0.007/0.035]? Error of EW-f
95-100 F6.3 0.1nm EWg [-1.159/1.097]? Equivalent Width (He I 7065)
102-106 F5.3 0.1nm e_EWg [0.009/0.064]? Error of EW-g
108-112 F5.3 0.1nm EWh [0.375/1.382]? Equivalent Width (Ca II 8542)
114-119 F6.4 0.1nm e_EWh [0.033/0.058]? Error of EW-h
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 22-Sep-2023