J/ApJ/846/115 V-band photometry and RVs of V482 Persei system (Torres+, 2017)
The quadruple-lined, doubly eclipsing system V482 Persei.
Torres G., Lacy C.H.S., Fekel F.C., Wolf M., Muterspaugh M.W.
<Astrophys. J., 846, 115 (2017)>
=2017ApJ...846..115T 2017ApJ...846..115T
ADC_Keywords: Binaries, eclipsing ; Photometry, VRI ; Spectra, optical ;
Radial velocities
Keywords: binaries: eclipsing; stars: evolution; stars: fundamental parameters;
stars: individual (V482 Per); techniques: photometric;
techniques: radial velocities
Abstract:
We report spectroscopic and differential photometric observations of
the A-type system V482 Per, which reveal it to be a rare hierarchical
quadruple system containing two eclipsing binaries. One binary has the
previously known orbital period of 2.4 days and a circular orbit, and
the other a period of 6 days, a slightly eccentric orbit (e=0.11), and
shallow eclipses only 2.3% deep. The two binaries revolve around their
common center of mass in a highly elongated orbit (e=0.85) with a
period of 16.67yr. Radial velocities are measured for all components
from our quadruple-lined spectra and are combined with the light
curves and measurements of times of minimum light for the 2.4 day
binary to solve for the elements of the inner and outer orbits
simultaneously. The line-of-sight inclination angles of the three
orbits are similar, suggesting they may be close to coplanar. The
available observations appear to indicate that the 6 day binary
experiences significant retrograde apsidal motion in the amount of
about 60 deg per century. We derive absolute masses for the four stars
good to better than 1.5%, along with radii with formal errors of 1.1%
and 3.5% for the 2.4 day binary and ∼9% for the 6 day binary. A
comparison of these and other physical properties with current stellar
evolution models gives excellent agreement for a metallicity of
[Fe/H]=-0.15 and an age of 360Myr.
Description:
Differential photometry of V482 Per was obtained by measuring images
collected with two different robotic telescopes: the URSA WebScope at
the University of Arkansas at Fayetteville, AR, and the NFO WebScope
near Silver City, NM. All observations were made through a Bessel V
filter. Observations were made between 2001 December and 2016 January,
and are presented in Tables 1 and 2.
V482 Per was monitored spectroscopically with two different instruments.
We observed it between 2009 November and 2017 February at the
Harvard-Smithsonian Center for Astrophysics (CfA) with the Tillinghast
Reflector Echelle Spectrograph (TRES) on the 1.5m Tillinghast
reflector at the Fred L. Whipple Observatory (Mount Hopkins, AZ). The
wavelength coverage is approximately 3900-9100Å, with a resolving
power R∼44000.
From 2011 November through 2017 April, we additionally acquired 37
useful spectra of V482 Per with the Tennessee State University 2m
Automatic Spectroscopic Telescope (AST) and a fiber-fed echelle
spectrograph at the Fairborn Observatory in southeast Arizona. We used
only the wavelength region from 4920 to 7100Å, with a resolving
power R∼15000 at 6000Å.
Objects:
----------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Per)
----------------------------------------------------------------------
04 15 41.33 +47 25 19.9 V482 Per = TYC 3332-314-1 (P=2.446752)
----------------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 18 13000 *Differential V-band observations of V482 Per
from the URSA WebScope
table2.dat 18 14072 *Differential V-band observations of V482 Per
from the NFO WebScope
table3.dat 76 46 Heliocentric radial velocity measurements
of V482 Per from CfA
table4.dat 52 37 Heliocentric radial velocity measurements
of V482 Per from the Fairborn Observatory
table5.dat 43 114 Times of minimum light for V482 Per
refs.dat 68 37 References
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Note on table1.dat and table2.dat: Two comparison stars were measured near the
variable star (which has V=10.25, SpT A0): TYC 3332-0388-1 (V=10.22, SpT A5)
and TYC 3332-0146-1 (V=11.33).
The standard deviations of the differences in magnitudes between the two
comparison stars were 0.012mag for the URSA measurements and 0.015mag for
those from the NFO.
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See also:
I/329 : URAT1 Catalog (Zacharias+ 2015)
VI/135 : All-sky spectrally matched Tycho2 stars (Pickles+, 2010)
V/149 : LAMOST DR2 catalogs (Luo+, 2016)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/A+A/424/919 : Stellar models grids. Z=0.02, M=0.8 to 125 (Claret, 2004)
J/AJ/130/2838 : Velocity and light curves of RW Lac (Lacy+, 2005)
J/AJ/133/1209 : Orbits & masses of 14 visual double stars (Docobo+, 2007)
J/A+A/463/1061 : UBV photometry of V379 Cep (Harmanec+, 2007)
J/other/IBVS/5761 : Minima and maxima of 389 variables (Hubscher+, 2007)
J/ApJ/662/602 : Radial velocities of HD 110555 (Torres+, 2007)
J/other/IBVS/5874 : Minima and maxima of 299 variables (Hubscher+, 2009)
J/other/IBVS/5889 : Minima and maxima of 380 variables (Hubscher+, 2009)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)
J/ApJ/742/123 : Photometry and Velocity of LSPM J1112+7626 (Irwin+, 2011)
J/AJ/142/185 : The eclipsing binary stars HY Vir (Lacy+, 2011)
J/AJ/145/111 : RVs of 5 spectroscopic binaries (Fekel+, 2013)
J/AcA/63/323 : OGLE-III SMC eclipsing binary stars (Pawlak+, 2013)
J/MNRAS/437/1216 : VAST Survey. A-type stars multiplicity (De Rosa+, 2014)
J/AJ/147/104 : Photom. & velocities of 1SWASP J093010A & B (Koo+, 2014)
J/AJ/147/87 : From binaries to multiples. II. (Tokovinin, 2014)
J/MNRAS/448/946 : Kepler eclipse timing variations (Borkovits+, 2015)
J/MNRAS/455/4136 : Kepler triples (Borkovits+, 2016)
J/ApJ/844/103 : Orbit alignment in triple stars (Tokovinin, 2017)
J/ApJ/836/177 : RVs and R-band obs. of the EB* V541 Cyg (Torres+, 2017)
Byte-by-byte Description of file: table[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d HJD [52250.75/57417.72] Heliocentric Julian Date;
JD-2400000
13- 18 F6.3 mag dVmag [-0.01/0.7] Differential Bessel V band magnitude
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d HJD [55143.80/57794.73] Heliocentric Julian Date;
JD-2400000
12- 18 F7.2 km/s HRV-Aa [-168/94] Heliocentric radial velocity,
component Aa
20- 23 F4.2 km/s e_HRV-Aa [1.7/7.2] Uncertainty in HRV-Aa
25- 31 F7.2 km/s HRV-Ab [-200.1/121.1] Heliocentric radial velocity,
component Ab
33- 36 F4.2 km/s e_HRV-Ab [1.3/5.6] Uncertainty in HRV-Ab
38- 44 F7.2 km/s HRV-Ba [-133/67] Heliocentric radial velocity,
component Ba
46- 49 F4.2 km/s e_HRV-Ba [0.6/2.8] Uncertainty in HRV-Ba
51- 57 F7.2 km/s HRV-Bb [-111.1/95] Heliocentric radial velocity,
component Bb
59- 62 F4.2 km/s e_HRV-Bb [0.6/2.8] Uncertainty in HRV-Bb
64- 69 F6.4 --- Phase1 Phase, Aa+Ab
71- 76 F6.4 --- Phase2 Phase, Ba+Bb
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d HJD [55893.88/57849.64] Heliocentric Julian Date;
JD-2400000
12- 17 F6.1 km/s HRV-Aa [-149/95]? Heliocentric radial velocity,
component Aa (1)
19- 24 F6.1 km/s HRV-Ab [-173.2/123.4]? Heliocentric radial velocity,
component Ab (1)
26- 31 F6.1 km/s HRV-Ba [-131/40]? Heliocentric radial velocity,
component Ba (1)
33- 38 F6.1 km/s HRV-Bb [-110.1/63]? Heliocentric radial velocity,
component Bb (1)
40- 45 F6.4 --- Phase1 ? Phase, Aa+Ab
47- 52 F6.4 --- Phase2 ? Phase, Ba+Bb
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Note (1): Uncertainties for stars Aa, Ab, Ba, and Bb are 5.4, 3.9, 1.3, and
1.6km/s, respectively.
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.5 d HJD [47565.37/57812.37] Heliocentric Julian Date;
JD-2400000
14- 20 F7.5 d e_HJD [0/0.006]? Measurement error (1)
22- 22 I1 --- Type [1/2] 1:primary eclipse or 2:secondary eclipse
24- 31 F8.5 d O-C [-0.006/0.007] O-C residuals, see section 3
33- 40 F8.3 yr Epoch [1989/2017.2] Epoch of minimum light
42- 43 I2 --- r_Epoch [1/37] References for the times of minimum light
(see refs.dat file)
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Note (1): Measurement errors are listed as published, when available.
Uncertainties for the timings with no published errors are assumed to be
0.0027d for primary minima and 0.0010d for secondary minima.
See Section 3.2.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode
24- 46 A23 --- Auth Author(s)
47- 68 A22 --- Comm Comment
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-May-2018