Study of Eclipsing Binary and Multiple Systems in OB Associations IV: Cas OB6 Member DN Cas

V. Bakis; H. Bakis; S. Bilir; Z. Eker

doi:10.1017/pasa.2016.36

paper

Study of Eclipsing Binary and Multiple Systems in OB Associations IV: Cas OB6 Member DN Cas

arXiv:1608.00456 · doi:10.1017/pasa.2016.36

Abstract

An early-type, massive, short-period ( $P_{orb} = 2^{d} .310951$ ) eclipsing spectroscopic binary DN Cas has been re-visited with new spectral and photometric data. The masses and radii of the components have been obtained as $M_{1} = 19.04 \pm 0.07 M_{⊙}$ , $M_{2} = 13.73 \pm 0.05 M_{⊙}$ and $R_{1} = 7.22 \pm 0.06 R_{⊙}$ , $R_{2} = 5.79 \pm 0.06 R_{⊙}$ , respectively. Both components present synchronous rotation ( $V_{rot1} = 160$ km s $^{- 1}$ , $V_{rot2} = 130$ km s $^{- 1}$ ) with their orbit. Orbital period analysis yielded a physically bound additional component in the system with a minimum mass of $M_{3} = 0.88 M_{⊙}$ orbiting in an eccentric orbit ( $e = 0.37 \pm 0.2$ ) with an orbital period of $P_{12} = 42 \pm 9$ yrs. High precision absolute parameters of the system allowed us to derive a distance to DN Cas as 1.7 $\pm$ 0.2 kpc which locates the system within the borders of the Cas OB6 association (d=1.8 kpc; Mel'nik & Dambis, 2009). The space velocities and the age of DN Cas are in agreement with those of Cas OB6. The age of DN Cas ( $τ =$ 3-5 Myr) is found to be 1-2 Myr older than the embedded clusters (IC 1795, IC 1805 and IC 1848) in the Cas OB6 association, which implies a sequential star formation in the association.

10 pages, including 5 figures and 5 tables, accepted for publication in PASA

Study of Eclipsing Binary and Multiple Systems in OB Associations IV: Cas OB6 Member DN Cas

Abstract

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