GEOS Results for PX Cephei

Boninsegna, R.

doi:10.1007/978-3-642-74020-6_82

Cited by 2 publications

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“…Normal points of blue filter Times of minima of LO And. References: (1)Berthold T. & Boninsegna, R.(1985), (2)Diethelm & Gautschy (1980), (3)Boninsegna, R. (1983), (4) BBSAG Bull.73, (5)Isles, J.E. (1986),(6)BBSAG Bull.80, (7) BBSAG Bull.82, (8) BBSAG Bull.90, (9) BBSAG Bull.91, (10) BBSAG Bull.92, (11) BBSAG Bull.93, (12) Isles, J.E.…”

mentioning

confidence: 99%

First light curve and period study of LO Andromedae

Gürol¹,

Müyesseroğlu

2005

Astron. Nachr.

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Abstract. New BV light curves and times of minimum light for the short period W UMa system LO And were analyzed to derive the preliminary physical parameters of the system. The light curves were obtained at Ankara University Observatory during 5 nights in 2003. A new ephemeris is determined for the times of primary minimum. The analysis of the light curves is made using the Wilson-Devinney 2003 code. The present solution reveals that LO And has a photometric mass ratio q = 0.371 and is an A-type contact binary. The period of the system is still increasing, which can be attributed to light-time effect and mass transfer between the components. With the assumption of coplanar orbit of the third body the revealed mass is M3 = 0.21M . If the period change dP/dt = 0.0212 sec/yr is caused only by the mass transfer between components (from the lighter component to the heavier) the calculated mass transfer rate is dm/dt = 1.682 × 10 −7 M /yr. The absolute radii and masses estimated for the components, based on our photometric solution and the absolute parameters of the systems which have nearly same period are R1 = 1.30R , R2 = 0.85R , M1 = 1.31M , M2 = 0.49M respectively for the primary and secondary components.

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confidence: 99%

First light curve and period study of LO Andromedae

Gürol¹,

Müyesseroğlu

2005

Astron. Nachr.

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“…Diethelm & Gautschy (1980) made visual observations and deduced a preliminary ephemeris with a period of 0.190429 d. Meanwhile, they made photoelectric observations and reported the first photoelectric light curve, which was thought to cover a complete cycle. Boninsegna (1983) collected 102 light-minimum times and improved the ephemeris, such that the period provided by Diethelm & Gautschy (1980) was confirmed to be roughly half of the real value. They presented the first full light curve with the real period and found that LO And exhibits a typical EW-type luminosity variation.…”

Section: Introductionmentioning

confidence: 94%

“…Diethelm & Gautschy (1980); 3. Boninsegna (1983); 4. Bob Nelson's O − C files, 2013 (https://www.aavso.org/bob-nelsons-o-c-files); 5. http://var.astro.cz/ocgate/; 6.…”

Section: Orbital Period Changes and Physical Originsmentioning

confidence: 99%

LO And: an A-subtype contact binary with a very cool third component

Huang

et al. 2021

Res. Astron. Astrophys.

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Despite the intensive investigations since the discovery of LO And approximately 60 yr ago, its evolutionary status and subtype are still a matter of controversy. By simultaneously modeling the radial-velocity curves and new light curves with the Wilson-Devinney code, we present new geometric, photometric and absolute parameters for this system. The simultaneous solution suggests that LO And is an A-subtype contact binary with a contact degree of 32.4%. The absolute parameters are modified to become M 1 = 1.409 M ⊙, M 2 = 0.449 M ⊙, R 1 = 1.36 R ⊙ and R 2 = 0.83 R ⊙. From our observations and data from surveys, we determined 334 eclipse timings. The O – C diagram, constructed from the new eclipse timings and those reported in the literature, reveals a secular increase and a cyclic variation in its orbital period. The former is caused by conservative mass transfer from the secondary component with less mass to the primary one with more mass. The latter may be explained by either the cyclic magnetic activity on the two components or the light-time effect due to a third body. With the absolute physical parameters, we investigated its evolutionary status, and find that LO And is an unevolved contact binary undergoing thermal relaxation oscillation, which will eventually coalesce into a single star with rapid rotation.

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GEOS Results for PX Cephei

Cited by 2 publications

References 0 publications

First light curve and period study of LO Andromedae

First light curve and period study of LO Andromedae

LO And: an A-subtype contact binary with a very cool third component

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