Observations and light curve solutions of ultrashort-period eclipsing binaries

Abstract

Photometric observations in V and I bands and low-dispersion spectra of ten ultrashort-period binaries (NSVS 2175434, NSVS 2607629, NSVS 5038135, NSVS 8040227, NSVS 9747584, NSVS 4876238, ASAS 071829-0336.7, SWASP 074658.62+224448.5, NSVS 2729229, NSVS 10632802) are presented. One of them, NSVS 2729229, is newly discovered target. The results from modeling and analysis of our observations revealed that: (i) Eight targets have overcontact configurations with considerable fillout factor (up to 0.5) while NSVS 4876238 and ASAS 0718-03 have almost contact configurations; (ii) NSVS 4876238 is rare ultrashort-period binary of detached type; (iii) all stellar components are late dwarfs; (iv) the temperature difference of the components of each target does not exceed 400 K; (v) NSVS 2175434 and SWASP 074658.62+224448.5 exhibit total eclipses and their parameters could be assumed as well-determined; (v) NSVS 2729229 shows emission in the H_{alpha} line. Masses, radii and luminosities of the stellar components were estimated by the empirical relation "period, orbital axis" for short- and ultrashort-period binaries. We found linear relations mass-luminosity and mass-radius for the stellar components of our targets.

arXiv commentAccepted for publication in PASA

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Cited by in corpus (10)

• The first light curve modeling and orbital period change investigation of nine contact binaries around the short period cut-off
• Contact binaries at the short period cut-off I. statistics and the first photometric investigations of ten totally eclipsing systems
• CoBiToM Project -- II: Evolution of contact binary systems close to the orbital period cut-off
• Three Ultra-short Period Contact Eclipsing Binary Systems Mined from Massive Astronomical Surveys
• Light curve analysis of six totally eclipsing W UMa binaries
• Photometric light curve solutions of three ultra-short period eclipsing binaries
• The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni
• The First Photometric Study of AH Mic Contact Binary System
• The first low-mass eclipsing binary within the fully convective zone from TMTS
• The Photometric Study of Six W UMa Systems and Investigation of the Mass-Radius Relations for Contact Binary Stars