J/AJ/147/104 Photometry and velocities of 1SWASP J093010A and B (Koo+, 2014)
1SWASP J093010.78+533859.5: a possible hierarchical quintuple system.
Koo J.-R., Lee J.W., Lee B.-C., Kim S.-L., Lee C.-U., Hong K., Lee D.-J.,
Rey S.-C.
<Astron. J., 147, 104 (2014)>
=2014AJ....147..104K 2014AJ....147..104K
ADC_Keywords: Binaries, eclipsing ; Radial velocities ; Photometry, UBV
Keywords: binaries: eclipsing - stars: fundamental parameters -
stars: individual: 1SWASP J093010.78+533859.5
Abstract:
Among quadruples or higher multiplicity stars, only a few doubly
eclipsing binary systems have been discovered. They are important
targets for understanding the formation and evolution of multiple
stellar systems because we can obtain accurate stellar parameters from
photometric and spectroscopic studies. We present the observational
results of this kind of rare object, 1SWASP J093010.78+533859.5, for
which the doubly eclipsing feature had been detected previously from
the SuperWASP photometric archive. Individual point-spread function
photometry for two objects with a separation of about 1.9" was
performed for the first time in this study. Our time-series
photometric data confirms the finding of Lohr et al. that the bright
object A is an Algol-type detached eclipsing binary and the fainter B
is a W UMa-type contact eclipsing. Using high-resolution optical
spectra, we obtained well-defined radial velocity variations of system
A. Furthermore, stationary spectral lines were detected that must have
originated from a further, previously unrecognized stellar component.
It was confirmed by the third object contribution from the light-curve
analysis. No spectral feature of system B was detected, probably due
to motion blur by long exposure times. We obtained the binary
parameters and the absolute dimensions of systems A and B from
light-curve synthesis with and without radial velocities,
respectively. The primary and secondary components of system A have a
spectral type of K1 and K5 main sequences, respectively. Two
components of system B have nearly the same type of K3 main sequence.
Light variations for both binaries are satisfactorily modeled by using
two-spot models with one starspot on each component. We estimated the
distances to systems A and B individually. Two systems may have
similar distances of about 70 pc and seem to be gravitationally bound
with a separation of about 130 AU. In conclusion, we suggest that
1SWASP J093010.78+533859.5 is a quintuple stellar system with a
hierarchical structure of a triple system A(ab)c and a binary system
B(ab).
Description:
High-resolution spectroscopic observations were performed to measure
the radial velocity of each component. Spectra of J093010 were
obtained in 2012 November 18, 2012 November 20-21, 2012 December 09,
2013 February 22, and in 2013 March 21-23 by using the fiber-fed
spectrograph Bohyunsan Optical Echelle Spectrograph (BOES) attached to
the 1.8m reflector at Bohyunsan Optical Astronomy Observatory in Korea
(with a resolving power of R=30000).
Photometric observations were carried out using the 4k CCD camera
attached to a 1.0m telescope at Mount Lemmon Optical Astronomy
Observatory (LOAO) in Arizona, USA, in 2012 December 06-10, 2012
December 27, 2013 January 05-10, 2013 February 10, 2013 February 16,
and 2013 February 23-24. Detailed information of the telescope and
detector can be found in Lee et al. (2012, cat. J/AJ/143/95).
Objects:
------------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
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09 30 10.75 +53 38 59.8 J093010A = TYC 3807-759-1 (P=1.3055)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
binaries.dat 83 2 Positions and periods of J093010A and B
table2.dat 33 18038 CCD photometric data of J093010A and B
table5.dat 52 69 Radial velocities for J093010A
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
I/276 : Tycho Double Star Catalogue (TDSC) (Fabricius+ 2002)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/A+A/549/A86 : Period change for SuperWASP eclipsing binaries (Lohr+, 2013)
J/AJ/145/16 : Differential BVRI light curves of NSVS 02502726 (Lee+, 2013)
J/AJ/143/95 : Transit light curves of HAT-P-12 (Lee+, 2012)
J/A+A/546/A5 : eps CrB radial velocity curve (Lee+, 2012)
J/A+AS/124/75 : Multiple star catalogue (MSC) (Tokovinin 1997-1999)
Byte-by-byte Description of file: binaries.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- System Name of the doubly eclipsing multiple system
28 A1 --- Comp Component designation (A or B)
30- 37 A8 --- SName Short name of the eclipsing binary
39- 52 A14 --- Name Name of the eclipsing binary
54- 55 I2 h RAh Hour of Right Ascension (J2000) (1)
57- 58 I2 min RAm Minute of Right Ascension (J2000) (1)
60- 64 F5.2 s RAs Second of Right Ascension (J2000) (1)
66 A1 --- DE- Sign of the Declination (J2000) (1)
67- 68 I2 deg DEd Degree of Declination (J2000) (1)
70- 71 I2 arcmin DEm Arcminute of Declination (J2000) (1)
73- 76 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1)
78- 83 F6.4 d Per Period
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Note (1): From SIMBAD database (http://simbad.u-strasbg.fr/simbad/).
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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- 7 A7 --- --- [J093010]
8 A1 --- Comp Component designation (A or B)
10 A1 --- Flt Filter used (B or V)
12- 20 F9.5 d HJD Heliocentric Julian Date (HJD-2456000)
22- 27 F6.3 mag Dmag Differential magnitude in Flt
29- 33 F5.3 mag e_Dmag Uncertainty in Dmag
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [2456]
5- 13 F9.5 d HJD Heliocentric Julian Date (HJD-2456000)
15- 21 F7.2 km/s RV1 Primary radial velocity ("a" component)
23- 27 F5.2 km/s e_RV1 Uncertainty in RV1
29- 35 F7.2 km/s RV2 ? Secondary radial velocity ("b" component)
37- 41 F5.2 km/s e_RV2 ? Uncertainty in RV2
43- 47 F5.2 km/s RV3 Tertiary radial velocity ("c" component)
49- 52 F4.2 km/s e_RV3 Uncertainty in RV3
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 15-Sep-2014