- ID:
- ivo://CDS.VizieR/J/AJ/118/2211
- Title:
- M31F eclipsing binaries and Cepheids
- Short Name:
- J/AJ/118/2211
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- As a first step in the DIRECT project, between September 1996 and October 1997 we obtained 95 full/partial nights on the F.L. Whipple Observatory 1.2m telescope and 36 full nights on the Michigan-Dartmouth-MIT 1.3 m telescope to search for DEBs and new Cepheids in the M31 and M33 galaxies. In this paper, the fifth in the series, we present the catalog of variable stars found in the field M31F [(RA, DE) = (10.10{deg}, 40.72{deg}), J2000.0]. We have found 64 variable stars: four eclipsing binaries, 52 Cepheids and eight other periodic, possible long-period or nonperiodic variables. The catalog of variables, as well as their photometry and finding charts, is available via anonymous ftp and the World Wide Web. The complete set of the CCD frames is available upon request.
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- ID:
- ivo://CDS.VizieR/J/AJ/153/238
- Title:
- Mid-eclipse times of DV UMa
- Short Name:
- J/AJ/153/238
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- DV UMa is an eclipsing dwarf nova with an orbital period of ~2.06hr, which lies just at the bottom edge of the period gap. To detect its orbital period changes, we present 12 new mid-eclipse times by using our CCD photometric data and archival data. The latest version of the O-C diagram, combined with the published mid-eclipse times in quiescence, and spanning ~30 years, was obtained and analyzed. The best fit to those available eclipse timings shows that the orbital period of DV UMa is undergoing a cyclic oscillation with a period of 17.58(+/-0.52) years and an amplitude of 71.1(+/-6.7) s. The periodic variation most likely arises from the light-travel-time effect via the presence of a circumbinary object, because the required energy to drive the Applegate mechanism is too high in this system. The mass of the unseen companion was derived as M_3_sini'=0.025(+/-0.004)M_{Sun}_. If the third body is in the orbital plane (i.e., i'=i=82.9{deg}) of the eclipsing pair, this would indicate it is a brown dwarf. This hypothetical brown dwarf is orbiting its host star at a separation of ~8.6 au in an eccentric orbit (e=0.44).
- ID:
- ivo://CDS.VizieR/J/AJ/157/150
- Title:
- Mid-eclipse times of KIC 10544976
- Short Name:
- J/AJ/157/150
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In recent years, several close post-common-envelope eclipsing binaries have been found to show cyclic eclipse timing variations (ETVs). This effect is usually interpreted either as the gravitational interaction among circumbinary bodies and the host binary - known as the light travel time (LTT) effect - or as the quadrupole moment variations in one magnetic active component - known as the Applegate mechanism. In this study, we present an analysis of the ETV and the magnetic cycle of the close binary KIC 10544976. This system is composed of a white dwarf and a red dwarf in a short orbital period (0.35 days) and was monitored by ground-based telescopes between 2005 and 2017 and by the Kepler satellite between 2009 and 2013. Using the Kepler data, we derived the magnetic cycle of the red dwarf by two ways: the rate and energy of flares and the variability due to spots. Both methods resulted in a cycle of ~600 days, which is in agreement with magnetic cycles measured for single low-mass stars. The orbital period of KIC 10544976 shows only one long-term variation which can be fitted by an LTT effect with period of ~16.8 yr. Hence, one possible explanation for the ETVs is the presence of a circumbinary body with a minimal mass of ~13.4 M_Jup_. In the particular scenario of coplanarity between the external body and the inner binary, the third body mass is also ~13.4 M_Jup_. In this case, the circumbinary planet must either have survived the evolution of the host binary or have been formed as a consequence of its evolution.
- ID:
- ivo://CDS.VizieR/J/other/PASA/31.24
- Title:
- Milky Way detached double-lined EB catalog
- Short Name:
- J/other/PASA/31.
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The most accurate stellar astrophysical parameters were collected from the solutions of the light and the radial velocity curves of 257 detached double-lined eclipsing binaries in the Milky Way. The catalogue contains masses, radii, surface gravities, effective temperatures, luminosities, projected rotational velocities of the component stars, and the orbital parameters. The number of stars with accurate parameters increased 67% in comparison to the most recent similar collection by Torres, Andersen, & Gimenez (2010, Cat. J/other/A+ARv/18.67). Distributions of some basic parameters were investigated. The ranges of effective temperatures, masses, and radii are (K)<43000, 0.18<M/M_{sun}_<33, and 0.2<R/R_{sun}_<21.2, respectively. Being mostly located in one kpc in the Solar neighborhood, the present sample covers distances up to 4.6kpc within the two local Galactic arms, Carina-Sagittarius and Orion Spur. The number of stars with both mass and radius measurements better than 1% uncertainty is 93, better than 3% uncertainty is 311, and better than 5% uncertainty is 388. It is estimated from the Roche lobe filling factors that 455 stars (88.5% of the sample) are spherical within 1% of uncertainty.
- ID:
- ivo://CDS.VizieR/J/other/IBVS/5731
- Title:
- Minima and maxima of 816 variables
- Short Name:
- J/other/IBVS/573
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this 55th compilation of BAV results, photoelectric observations obtained in the years 2005 till 2006 are presented on 816 variable stars giving 1722 minima and maxima. All moments of minima and maxima are heliocentric. The values in column 'O-C' are determined without incorporation of nonlinear terms. The references are given in the section 'Remarks'. All information about photometers and filters are specified in the column 'Rem'. The observations were made at private observatories. The photoelectric measurements and all the lightcurves with evaluations can be obtained from the office of the BAV for inspection.
- ID:
- ivo://CDS.VizieR/J/other/IBVS/5959
- Title:
- Minima and maxima of 436 variables
- Short Name:
- J/other/IBVS/595
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this 68th compilation of BAV results, photoelectric observations obtained in the year 2010 are presented on 436 variable stars giving 784 minima on eclipsing binaries and maxima on pulsating stars. All moments of minima and maxima are heliocentric. The errors are tabulated in column '+/-'. The values in column 'O-C' are determined without incorporation of nonlinear terms.The references are given in the section 'Remarks'. All information about photometers and filters are specified in the column 'Rem'. The observations were made at private observatories. The photoelectric measurements and all the lightcurves with evaluations can be obtained from the office of the BAV for inspection.
- ID:
- ivo://CDS.VizieR/J/other/IBVS/5984
- Title:
- Minima and maxima of 503 variables
- Short Name:
- J/other/IBVS/598
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this 69th compilation of BAV results, photoelectric observations obtained in the year 2010 and 2011 are presented on 503 variable stars giving 767 minima on eclipsing binaries and maxima on pulsating stars. All moments of minima and maxima are heliocentric. The errors are tabulated in column '+/-'. The values in column 'O-C' are determined without incorporation of nonlinear terms. The references are given in the section 'Remarks'. All information about photometers and filters are specified in the column 'Rem'. The observations were made at private observatories. The photoelectric measurements and all the light curves with evaluations can be obtained from the office of the BAV for inspection.
- ID:
- ivo://CDS.VizieR/J/AJ/150/178
- Title:
- Minima of 41 binaries from entire Kepler mission
- Short Name:
- J/AJ/150/178
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Many short-period binary stars have distant orbiting companions that have played a role in driving the binary components into close separation. Indirect detection of a tertiary star is possible by measuring apparent changes in eclipse times of eclipsing binaries as the binary orbits the common center of mass. Here we present an analysis of the eclipse timings of 41 eclipsing binaries observed throughout the NASA Kepler mission of long duration and precise photometry. This subset of binaries is characterized by relatively deep and frequent eclipses of both stellar components. We present preliminary orbital elements for seven probable triple stars among this sample, and we discuss apparent period changes in seven additional eclipsing binaries that may be related to motion about a tertiary in a long period orbit. The results will be used in ongoing investigations of the spectra and light curves of these binaries for further evidence of the presence of third stars. Fundamental Parameters}
- ID:
- ivo://CDS.VizieR/J/AJ/143/137
- Title:
- Minima of 41 eclipsing binaries from a Kepler survey
- Short Name:
- J/AJ/143/137
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first results of a Kepler survey of 41 eclipsing binaries that we undertook to search for third star companions. Such tertiaries will periodically alter the eclipse timings through light travel time and dynamical effects. We discuss the prevalence of starspots and pulsation among these binaries and how these phenomena influence the eclipse times. There is no evidence of short-period companions (P<700days) among this sample, but we do find evidence for long-term timing variations in 14 targets (34%). We argue that this finding is consistent with the presence of tertiary companions among a significant fraction of the targets, especially if many have orbits measured in decades. This result supports the idea that the formation of close binaries involves the deposition of angular momentum into the orbital motion of a third star.
- ID:
- ivo://CDS.VizieR/J/AJ/149/197
- Title:
- Minima of 10 Kepler eclipsing binaries
- Short Name:
- J/AJ/149/197
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Analyzing the available photometry from the Kepler satellite and other databases, we performed detailed light curve modeling of 10 eclipsing binary systems that were found to exhibit a periodic modulation of their orbital periods. All of the selected systems are detached Algol type, with orbital periods from 0.9 to 2.9 days. In total, 9448 times of minimum for these binaries were analyzed in an attempt to identify the period variations caused by the third bodies in these systems. The well-known method of the light-travel time effect was used for the analysis. The orbital periods of the outer bodies were found to be between 1 and 14 years. This hypothesis makes such systems interesting for future prospective detections of these components, despite their low predicted masses. Considering the dynamical interaction between the orbits, the system KIC 3440230 seems to be the most interesting, in which one would expect the detection of some effects (i.e., changing the inclination) even after a few years or decades of observations.
