spectral monitoring of uxors with interference filters v. strelnitski, l. weiss, m. davidson, &...
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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
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UXORsUXORs
Herbig AeBe stars Herbig AeBe stars
Deep irregular drops of brightnessDeep irregular drops of brightness
Small dust cloudlets [in a disk] ?Small dust cloudlets [in a disk] ?
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RR Tau: Photometry and Spectroscopy
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RR Tau, Spectra
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Line Flux versus Continuum Brightness
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V3798 Sgr
R.A.: 18 15 25.73
DEC: -19 39 15.1
(2000.0)
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V3798 Sgr
“Hα” (6563Å) “Ri”
(6450Å)
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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)
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V3798 Sgr: S(Ri) versus Time
0
0.05
0.1
0.15
0.2
0.25
0.3
4580 4600 4620 4640 4660 4680 4700 4720
JD - 2450000
S(R
i)
Period 1
Period 2
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R CrB
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V3798 Sgr: S(Ri) versus Time
0
0.05
0.1
0.15
0.2
0.25
0.3
4580 4600 4620 4640 4660 4680 4700 4720
JD - 2450000
S(R
i)
Period 1
Period 2
Are UXORs intrinsically variable?
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S(Hα) versus κS(Ri)
V3798 Sgr: S (Ha) vs kappa*S (Ri) for the period of dimmings
(JD 4615-4651)
y = 0.9564x + 0.0087
R2 = 0.9959
0.05
0.1
0.15
0.2
0.25
0.04 0.09 0.14 0.19 0.24
kappa*S (Ri)
S(H
a)
V3798 Sgr: S (Ha) vs kappa*S (Ri) for the period of high brightness
(JD 4652-4706)
y = 1.0473x - 0.0011
R2 = 0.9857
0.150.170.190.210.230.250.270.290.31
0.15 0.2 0.25 0.3
kappa*S (Ri)S
(Ha)
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V3798 Sgr: Ri and Hα Emission
V3798 Sgr: The Ha Emission Light Curve[ E = S (Ha ) - 0.9564*kappa*S (Ri) ]
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
4580 4630 4680
JD - 2450000
E [
in u
nit
s o
f f_
C(5
63)]
*Δλ(
Hα
)]
V3798 Sgr: S(Ri) versus Time
0
0.05
0.1
0.15
0.2
0.25
0.3
4580 4600 4620 4640 4660 4680 4700 4720
JD - 2450000
S(R
i)
Period 1
Period 2
Period 1
Period 2
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ConclusionsConclusions
Interference filter photometry of UXORs Interference filter photometry of UXORs allows for separation of emission line allows for separation of emission line variability from continuum variabilityvariability from continuum variability
V3798 Sgr is a new UXOR and it may be V3798 Sgr is a new UXOR and it may be intrinsicallyintrinsically variable variable
MMO starts an extensive program of MMO starts an extensive program of monitoring UXORs with interference monitoring UXORs with interference filtersfilters