Age Spread in Galactic Star Forming Region W3 Main

Bik, Arjan; Henning, Thomas; Stolte, A.; Brandner, W.; Gouliermis, D. A.; Gennaro, Mario; Pasquali, A.; Rochau, Boyke; Beuther, H.; Ageorges, N.; Seifert, W.; Wang, Yuan; Kudryavtseva, N.

doi:10.1007/978-3-319-03041-8_78

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“…The association hosts a number of HII regions (IC 1805, IC 1848, S196 and S201) and * volkanbakis@akdeniz.edu.tr several radio sources W5 (IC 1848), W4 (surrounding IC 1805) and the W3 region (IC 1795). These regions are known with massive stellar content and active stellar formation which goes back in time to 3-5 Myrs for IC 1795 (Bik et al 2012), 1-3 Myrs for IC 1805 (Straižys et al, 2013) and 3-5 Myrs for IC 1848 (Lim et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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

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et al. 2016

Publ. Astron. Soc. Aust.

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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 M1 = 19.04 ± 0.07M⊙, M2 = 13.73 ± 0.05M⊙ and R1 = 7.22 ± 0.06R⊙, R2 = 5.79 ± 0.06R⊙, respectively. Both components present synchronous rotation (Vrot1 = 160 km s −1 , Vrot2 = 130 km s −1 ) with their orbit. Orbital period analysis yielded a physically bound additional component in the system with a minimum mass of M3 = 0.88M⊙ orbiting in an eccentric orbit (e = 0.37 ± 0.2) with an orbital period of P12 = 42 ± 9 yrs. High precision absolute parameters of the system allowed us to derive a distance to DN Cas as 1.7±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.

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Section: Introductionmentioning

confidence: 99%