First light curve and period study of LO Andromedae

Gürol, B.; Müyesseroğlu, Z.

doi:10.1002/asna.200410338

Cited by 6 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of the high precision and excellent symmetry in our multi-band light curves, the simultaneous solution should be more reliable than those of Nelson & Robb (2015) and Gürol & Müyesseroǧlu (2005). In addition, we noted that in the study of Nelson & Robb (2015), LO And is classified as a W-subtype contact binary.…”

Section: Simultaneous Solutions Of Light Curves and Radial-velocity C...mentioning

confidence: 94%

“…They presented the first full light curve with the real period and found that LO And exhibits a typical EW-type luminosity variation. Gürol & Müyesseroǧlu (2005) re-performed the photoelectric observations and derived the photometric solution of this system. They concluded that LO And is an A-subtype contact binary with a degree of contact of f = 30.6% and mass ratio q = 0.371.…”

Section: Introductionmentioning

confidence: 99%

“…They found a significant magnitude difference between two maxima in their light curves, i.e., the O'Connell effect (O'Connell 1951). They applied a spot model to the light-curve fit and guessed that the spot was migrating because the light curves reported by Gürol & Müyesseroǧlu (2005) did not manifest any significant asymmetry. In contrast to Gürol & Müyesseroǧlu (2005), Nelson & Robb (2015) argued that LO And is a W-subtype contact binary.…”

Section: Introductionmentioning

confidence: 99%

“…They applied a spot model to the light-curve fit and guessed that the spot was migrating because the light curves reported by Gürol & Müyesseroǧlu (2005) did not manifest any significant asymmetry. In contrast to Gürol & Müyesseroǧlu (2005), Nelson & Robb (2015) argued that LO And is a W-subtype contact binary. In addition to the uncertain photometric nature of LO And, its orbital period variation merits further investigation.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the uncertain photometric nature of LO And, its orbital period variation merits further investigation. Both Gürol & Müyesseroǧlu (2005) and Nelson & Robb (2015) revealed that a secular increase and periodic variation in its orbital period exist. The former was attributed to mass transfer.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Huang

et al. 2021

Res. Astron. Astrophys.

View full text Add to dashboard Cite

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.

show abstract

Section: Simultaneous Solutions Of Light Curves and Radial-velocity C...mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Huang

et al. 2021

Res. Astron. Astrophys.

View full text Add to dashboard Cite

show abstract

New compact hierarchical triple system candidates identified using Gaia DR3

Czavalinga

Mitnyan

Rappaport

et al. 2023

A&A

View full text Add to dashboard Cite

Aims. We introduce a novel way to identify new compact hierarchical triple stars by exploiting the huge potential of Gaia DR3 and also its future data releases. We aim to increase the current number of compact hierarchical triple systems significantly. Methods. We used several eclipsing binary catalogs from different sky surveys that list a total of more than 1 million targets to search for Gaia DR3 non-single-star orbital solutions with periods substantially longer than the eclipsing periods of the binaries. Those solutions in most cases are likely to belong to outer orbits of tertiary stars in those systems. We also attempted to validate some of our best-suited candidates using TESS eclipse timing variations. Results. We find 403 objects with suitable Gaia orbital solutions of which 27 are already known triple systems, leaving 376 newly identified hierarchical triple system candidates in our sample. We find the cumulative probability distribution of the outer orbit eccentricities to be very similar to those found in earlier studies based on observations of the Kepler and OGLE missions. We find measurable nonlinear eclipse timing variations or third-body eclipses in the TESS data for 192 objects which we also consider to be confirmed candidates. Of these, we construct analytical light-travel time effect models for the eclipse timing variations of 22 objects with well-sampled TESS observations. We compare the outer orbital parameters from our solutions with those from the Gaia solutions and find that the most reliable orbital parameter is the orbital period, while the values of the other parameters should be used with caution.

show abstract

First Photometric Investigation of the Neglected EW-type Binary System V502 Her

Zhao¹,

Qian²,

Liao³

et al. 2018

PASP

View full text Add to dashboard Cite

V502 Her is a neglected EW-type binary, which has been known for more than 60 years. The first multi-color CCD photometric light curve and spectroscopic observations of contact binary V502 Her was obtained. Based on the LAMOST data, its spectrum can be found to be F5. Together with solutions of light curves by using the Wilson-Devinney code, it infers that V502 Her is an A-type W UMa contact binary system with the mass ratio of q=0.313 and the filling factor of f=38.1%. According to all minimum times from the literature and our observations, the orbital period was analyzed and a long-term increase with a periodic change (P 3 = 26.8 years) was computed. The orbital period increase may be caused by the mass transfer from a less-massive component to the more massive one, which indicates that V502 Her is in the thermal relaxation oscillation (TRO) controller stage, while the light-travel time effect (LTTE) through the presence of a cool third body may lead to the periodic variation.

show abstract

First light curve and period study of LO Andromedae

Cited by 6 publications

References 17 publications

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

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

New compact hierarchical triple system candidates identified using Gaia DR3

First Photometric Investigation of the Neglected EW-type Binary System V502 Her

Contact Info

Product

Resources

About