J/AJ/147/35 Light curves of Algol-type binaries. VI. FR Ori (Yang+, 2014)
Photometric properties for selected Algol-type binaries.
VI. The newly discovered oEA star FR Orionis.
Yang Y.-G., Wei J.-Y., Li H.-L.
<Astron. J., 147, 35 (2014)>
=2014AJ....147...35Y 2014AJ....147...35Y
ADC_Keywords: Binaries, eclipsing ; Photometry, VRI
Keywords: binaries: eclipsing - stars: individual: FR Ori -
stars: variables: delta Scuti
Abstract:
New photometry of the neglected eclipsing binary FR Orionis was
obtained in 2012 November and December. Using the updated
Wilson-Devinney program, the photometric elements were deduced from
two-color light curves. The results indicate that this system is a
semi-detached binary, with a mass ratio of 0.325(±0.002) and a
fill-out factor of the primary of fp=73.5(±0.2)%. The oscillating
light curves imply that FR Ori may be an oscillating EA (oEA)-type
star with a rapidly pulsating, mass-accreting primary component. After
we removed the theoretical light curves from the observations, Fourier
analysis revealed that the more massive component possibly shows a
δ Scuti type pulsation with four detected frequencies. The
dominant frequency is f1=38.6c/day (i.e., Ppuls=37.3minutes), and
the pulsation constant is Q=0.014days. Based on all available
eclipsing times, the orbital period is undergoing a secular period
increase with a rate of dP/dt=+8.85(±0.66)x10-8day/yr, which may
be interpreted by mass transfer from the secondary to the primary. We
expect that the more massive component will fill its Roche lobe due to
mass transfer of the secondary. Therefore, the oEA star FR Ori may
evolve into a contact configuration.
Description:
New photometry of FR Ori was performed in 2012 November (Nov 7-8 and
Nov 16-20) and December (Dec 5-9), using the 60cm telescope at the
Xinglong Station (XLs) of the National Astronomical Observatories of
China (NAOC). A Princeton Instrument 1024*1024 CCD camera was mounted
at this telescope. The standard Johnson/Cousins set of BVIR filters
was applied.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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05 51 05.72 +09 26 37.5 FR Orionis = HD 248406 (P=0.88316227)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 39 1494 VR photometric observations for the eclipsing
binary FR Ori
table4.dat 58 83 All compiled eclipsing times for the eclipsing
binary FR Ori
refs.dat 83 38 References
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)
V/115 : Semi-detached eclipsing binaries (Surkova+, 2004)
V/124 : Approximate elements of eclipsing binaries (Svechnikov+, 1990)
J/AN/334/860 : Catalog of eclipsing variables. Ver. 2 (Avvakumova+, 2013)
J/AJ/137/226 : Differential light curves of TV Tri (Yang+, 2009)
J/AJ/139/1360 : AO Ser VR light curves (Yang+, 2010)
J/AJ/143/13 : Light curves of AL Gem and BM Mon (Yang+, 2012)
J/AJ/144/50 : Light curves of AV Hya and DZ Cas (Yang+, 2012)
J/AJ/144/136 : BV light curves of V1241 Tauri (Yang+, 2012)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD-V ? Heliocentric Julian Date of V band observation
14- 19 F6.3 mag DVmag ? Differential Johnson V band magnitude
21- 32 F12.4 d HJD-R Heliocentric Julian Date of R band observation
34- 39 F6.3 mag DRmag Differential Cousins R band magnitude
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
14- 21 F8.1 --- Epoch Observed epoch number
23- 25 A3 --- Meth Observational method (1)
27- 28 A2 --- Min Minimum type (I or II)
30- 36 F7.4 d O-C1 Residual of (O-C)1 (2)
38- 46 F9.6 d O-C Computed (O-C) residual
48- 54 F7.4 d O-C2 ? The final residuals of (O-C)2
55 A1 --- f_O-C2 [d] Indicates a discarded residual in O-C2
57- 58 I2 --- Ref Reference; in refs.dat file
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Note (1): Observation type as follows:
CCD = Charge-Coupled Device measurement;
vi = Visual observation;
pe = Photoelectric observation;
pg = Photographic observation.
Note (2): Given by the following quadratic equation:
(O-C)1=0.0069(34)-2.67(3)*10-6E+1.07(8)*10-10E2.
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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 identifier
4- 22 A19 --- BibCode Bibliographic code
24- 40 A17 --- Aut Author's name
43- 83 A41 --- Com Comments
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History:
From electronic version of the journal
References:
Yang et al., Paper I, 2009AJ....137..226Y 2009AJ....137..226Y, Cat. J/AJ/137/226
Yang et al., Paper II, 2010AJ....139.1360Y 2010AJ....139.1360Y, Cat. J/AJ/139/1360
Yang et al., Paper III, 2012AJ....143...13Y 2012AJ....143...13Y, Cat. J/AJ/143/13
Yang et al., Paper IV, 2012AJ....144...50Y 2012AJ....144...50Y, Cat. J/AJ/144/50
Yang et al., Paper V, 2012AJ....144..136Y 2012AJ....144..136Y, Cat. J/AJ/144/136
Zhang et al., Paper VII, 2014AJ....147...66Z 2014AJ....147...66Z, Cat. J/AJ/147/66
Yang et al., Paper VIII, 2014AJ....147..145Y 2014AJ....147..145Y, Cat. J/AJ/147/145
Yang et al., Paper IX, 2016AJ....152...49Y 2016AJ....152...49Y, Cat. J/AJ/152/49
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 04-Sep-2014