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Spectral Monitoring of UXORs with Interference Filters

This study at the Maria Mitchell Association AAVSO Meeting discusses the use of interference filters to analyze UXORs, focusing on V3798 Sgr, Herbig AeBe stars, irregular brightness drops, and dust cloudlets in disks. The research includes photometry and spectroscopy of RR Tau and V3798 Sgr. Analysis shows emission line flux correlation with continuum flux and a possible intrinsic variability in V3798 Sgr. The study concludes that interference filter photometry enables distinguishing emission line variability from continuum variability and suggests initiating extensive UXOR monitoring with interference filters.

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Spectral Monitoring of UXORs with Interference Filters

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  1. Spectral Monitoring of UXORs with Interference Filters V. Strelnitski, L. Weiss, M. Davidson, & G. Walker Maria Mitchell Association AAVSO Meeting, 10-17-08 V3798 Sgr

  2. UXORs • Herbig AeBe stars • Deep irregular drops of brightness • Small dust cloudlets [in a disk] ?

  3. RR Tau: Photometry and Spectroscopy

  4. RR Tau, Spectra

  5. Line Flux versus Continuum Brightness

  6. V3798 Sgr R.A.: 18 15 25.73 DEC: -19 39 15.1 (2000.0)

  7. V3798 Sgr “Hα” (6563Å) “Ri” (6450Å)

  8. A drop of theory… Differential Photometry: S ≡ (adu)T / (adu)C 1. Emission line flux correlates with the observed continuum flux S(Hα) = βγ * κS(Ri) , β ≡ [fT(6563) * ΔλT(Hα) / fT(6450) * ΔλT(Ri)] * [fC(6450) * ΔλC(Ri)] ] / [ fC(6563) * ΔλC(Hα)] γ ≡ 1 – (Wa – We ) / ΔλT(Hα) κ = exp [τ(6450) - τ (6563)] = exp [0.0158 Δm(Ri)]. 2. Emission line flux does not correlate with the dimming due to dust S(Hα) = βγ′ * κS(Ri) + E / [ fC(6563)]*Δλ(Hα)] , γ′ ≡ 1 – Wa / ΔλT(Hα)

  9. Period 2 Period 1

  10. R CrB

  11. Are UXORs intrinsically variable? Period 2 Period 1

  12. S(Hα) versusκS(Ri)

  13. V3798 Sgr: Ri and Hα Emission Period 2 Period 1 Period 2 Period 1

  14. Conclusions • Interference filter photometry of UXORs allows for separation of emission line variability from continuum variability • V3798 Sgr is a new UXOR and it may be intrinsically variable • MMO starts an extensive program of monitoring UXORs with interference filters

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