J/AJ/142/117 UBVrcIc differential photometry of V1853 Ori (Samec+, 2011)
UBVRcIc analysis of the recently discovered totally eclipsing extreme mass
ratio binary V1853 Orionis, and a statistical look at 25 other extreme mass
ratio solar-type contact binaries.
Samec R.G., Labadorf C.M., Hawkins N.C., Faulkner D.R., Van Hamme W.
<Astron. J., 142, 117 (2011)>
=2011AJ....142..117S 2011AJ....142..117S
ADC_Keywords: Stars, variable ; Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: evolution -
stars: individual (V1853 Ori)
Abstract:
We present precision CCD light curves, a period study, photometrically
derived standard magnitudes, and a five-color simultaneous Wilson code
solution of the totally eclipsing, yet shallow amplitude (Av∼0.4mag)
eclipsing, binary V1853 Orionis. It is determined to be an extreme
mass ratio, q=0.20, W-type W UMa overcontact binary. From our
standard star observations, we find that the variable is a late-type F
spectral-type dwarf, with a secondary component of about 0.24 solar
masses (stellar type M5V). Its long eclipse duration (41 minutes) as
compared to its period, 0.383-days, attests to the small relative size
of the secondary. Furthermore, it has reached a Roche lobe fill-out of
∼50% of its outer critical lobe as it approaches its final stages of
binary star evolution, that of a fast spinning single star.
Finally, a summary of about 25 extreme mass ratio solar-type binaries
is given.
Description:
This variable was recently discovered by the Robotic Optical Transient
Search Experiment (ROTSE)-I telescope. UBVRcIc light curves of V1853
Ori were taken on 2007 December 26, 29, 30, and 31 at Lowell
Observatory with the Lowell 31 inch reflector on Anderson Mesa,
outside Flagstaff, with the CRYOTYGER cooled (-100C) 2048x2048
chip Loral NASA CAM outfitted with standard Johnson-Cousins filters.
Objects:
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RA (2000) DE Designation(s)
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05 13 06.07 +15 58 12.2 V1853 Ori = ASAS J051305+1558.2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 17 1348 Photometry of V1853 Ori
table6.dat 167 28 Statistical summary of extreme mass ratio
solar-type binaries (EMRBs)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 F6.4 mag dmag Differential magnitude
9- 14 F6.4 d HJD Heliocentric Julian date (HJD-2454460)
17 A1 --- Band [UBVRI] Observed band
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name EMRBs name (last lines for Average and
Standard error values)
20- 25 F6.4 --- q Mass ratio (M2/M1)
27- 31 F5.2 deg incl Inclination
33- 36 I4 K T1 ?=- Temperature of primary
38- 41 I4 K T2 ?=- Temperature of secondary
43- 45 I3 K DT ?=- Differentce in temperature
47- 52 F6.1 K Tavg ?=- Average temperature
55- 61 A7 --- SpType MK spectral type
63- 67 F5.3 --- fo Fill-out factor
69- 77 F9.7 d Per Period
80- 93 A14 --- Pchgn Comment on period change
96- 98 A3 --- Spot [Yes/No ] Presence of Spots
104-106 A3 --- 3rd [Yes/No ?] Presence of 3rd components
112-167 A56 --- Ref Reference(s)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Nov-2012