J/A+A/572/A110 R-band light curve of MY Cam (Lorenzo+, 2014)
MY Camelopardalis, a very massive merger progenitor.
Lorenzo J., Negueruela I., Val Baker A.K.F., Garcia M., Simon-Diaz S.,
Pastor P., Mendez Majuelos M.
<Astron. Astrophys. 572, A110 (2014)>
=2014A&A...572A.110L 2014A&A...572A.110L
ADC_Keywords: Binaries, eclipsing ; Stars, early-type
Keywords: binaries: spectroscopic - binaries: eclipsing - stars: massive -
stars: early-type
Abstract:
The early-type binary MY Cam belongs to the young open cluster
Alicante 1, embedded in Cam OB3.
MY Cam consists of two early-O type main-sequence stars and shows a
photometric modulation suggesting an orbital period slightly above one
day. We intend to confirm this orbital period and derive orbital and
stellar parameters.
Timing analysis of a very exhaustive (4607 points) light curve
indicates a period of 1.1754514±0.0000015d. High-resolution spectra
and the cross-correlation technique implemented in the TODCOR program
were used to derive radial velocities and obtain the corresponding
radial velocity curves for MY Cam. Modelling with the stellar
atmosphere code FASTWIND was used to obtain stellar parameters and
create templates for cross-correlation. Stellar and orbital parameters
were derived using the Wilson-Devinney code, such that a complete
solution to the binary system could be described.
We determine masses of the primary and secondary stars in MY Cam are
37.7±1.6 and 31.6±1.4M☉ , respectively. The corresponding
temperatures, derived from the model atmosphere fit, are 42000 and
39000K, with the more massive component being hotter. Both stars are
overfilling their Roche lobes, sharing a common envelope. MY Cam
contains the most massive dwarf O-type stars found so far in an
eclipsing binary. Both components are still on the main sequence, and
probably not far from the zero-age main sequence. The system is a
likely merger progenitor, owing to its very short period.
Description:
Photometric data in R filter for the eclipsing binary system MY
Camelopardalis, obtained with two 8-inch aperture telescopes, a Meade
LX200 and a Vixen VISAC, with focal-ratios of f/6.3 and f/9,
respectively. Observations were made through a Johnson R-filter with
uniform 120-s exposures.
Objects:
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RA (2000) DE Designation(s)
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03 59 18.29 +57 14 13.7 MY Cam = V* MY Cam
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rphotmyc.dat 20 4607 Photometric data
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Byte-by-byte Description of file: rphotmyc.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD [2454530/2454794] Heliocentric Julian date
15- 20 F6.4 mag Rmag Johnson R magnitude
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Acknowledgements:
Javier Lorenzo, fjle3(at)alu.ua.es
(End) Javier Lorenzo [U.A,Spain], Patricia Vannier [CDS] 27-Oct-2014