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On the period–density relations and lower period limit of contact binaries.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Jul2023, Vol. 523 Issue 1, p1394-1398. 5p. - Publication Year :
- 2023
-
Abstract
- The theoretical relations between the orbital period and mean densities of component stars of contact binaries are deduced. It is found that the orbital period of a contact binary is inversely proportional to the square root of the mean densities of component stars with the slopes as functions of mass ratio and fill-out factor of system. A test of 148 well-studied contact binaries with physical parameters determined from comprehensive photometric and spectroscopic solutions shows that the upper limit of secondaries' mean densities depends strongly on the total masses, M 1 + M 2, of the contact systems. For a low-mass contact system with |$(M_{}+M_{2})\le 2\, \mathrm{M}_{\odot }$| , the maximum mean density of the secondary is strictly lower than that of a 5 Gyr star with a mass of (M + M 2)/2. Taking this as the basic constraint, the derived period–density relation was applied to simulate the orbital period distribution of low-mass contact binaries over the total-mass range of 1–2 |$\, \mathrm{M}_{\odot }$|. It reproduces a period cut-off at 0.12–0.16 d, depending on the fill-out factor. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DENSITY of stars
*STELLAR mass
*LOW mass stars
*ROOT-mean-squares
*BINARY stars
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 523
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 164199079
- Full Text :
- https://doi.org/10.1093/mnras/stad1465