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NEAR-CONTACT BINARY V836 Cygni Çanakkale, 2004

NEAR-CONTACT BINARY V836 Cygni Çanakkale, 2004. Observations. Ege University Obs. (30 cm.) Turkish National Obs. (40 cm.) Date range:2000-2002 U B V filters. No brightness deficiency at 0.5 (Zhukov & Markova1994) but at ~1.1. Before the analysis. Mode definition for WD code

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NEAR-CONTACT BINARY V836 Cygni Çanakkale, 2004

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  1. NEAR-CONTACT BINARY V836 Cygni Çanakkale, 2004

  2. Observations • Ege University Obs. (30 cm.) • Turkish National Obs. (40 cm.) • Date range:2000-2002 • U B V filters

  3. No brightness deficiency at 0.5(Zhukov & Markova1994)but at ~1.1

  4. Before the analysis • Mode definition for WD code Evidence for (semi-detached?) configuration Breinhorst et al.(1989): “detached, but...” f2=0.98 ±0.02

  5. f1= 0.9143 f2= 1.0008 Ωcr=2.5911 >

  6. *f(m) : Durbeck & Schumann (1982)

  7. NCB test: the criteria • P < 1 day • Facing surfaces < 0.1 orb. radius apart X • Not in contact  • 1 component at or near its Roche lobe  • Hotter: A v F ; cooler: 1 v 2 later  -------------------------------------------------------------- • Agreement in M-R-L relations of [Hilditch etal.(1988)]  • Two comp. lines parallel to the ZAMS [Oh et al. (2000)]? • Harmony in M-R-L relations of collected data  Shaw (1994)

  8. 1 2 NCB A W X x

  9. NCB A W X

  10. Classification for 836 Shaw (1994)

  11. about Evolution • Disadvantage: Single-lined, only f(m) • FO Vir type A.if come close enough to transfer required energy from hot to cool, photospere of the cool comp. is getting hot then A-type W UMa system. Shaw (1994) !!(AML by magnetic breaking is needed)

  12. B. Longer-period detached system via Case-A mass transfer semi-detached (836 is here) marginal contact (not in thermal eq.) the deeper contact A-type W UMa system [Hilditch etal.(1988), Budding(1984)]

  13. 1 2 NCB A W X x

  14. Problems and Future • Single-lined spectrae. • Prevent the morphology from varying study to study, by reducing the errors. Eg. q range: q=0.348 Ωcr=2.5699 near R.L. q=0.358 (10) Ωcr=2.5911at R.L. q=0.368 Ωcr=2.6120 at R.L. • AML: “ The secondaries of FO Vir types must be undermassive”.

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