From chris@ctiowb.ctio.noao.edu Thu Mar 12 16:12:10 1992 Received: from ctiowb (ctiowb.ctio.noao.edu) by noao.edu (4.1/SAG-Gemini.G78) id AA14131; Thu, 12 Mar 92 14:10:35 MST; for jeffery@cfanewton.harvard.edu Received: by ctiowb (4.1/JBH.4) id AA01057; Thu, 12 Mar 92 18:10:35 CDT Date: Thu, 12 Mar 92 18:10:35 CDT From: chris@ctiowb.ctio.noao.edu (chris smith x205) Message-Id: <9203122110.AA01057@ctiowb> To: jeffery@cfanewton.harvard.edu Status: R f1.0014,i_title = "SN1992A in fornax, median of 3 - Aperture 1" From chris@ctiowb.ctio.noao.edu Thu Mar 12 16:10:10 1992 Hi David! I'm back with a revised spectrum (the following email message). I've redone the flux calibration with calibrators out past 8000 A, so now the "bump" past 7500 CAN be trusted (it's smaller now, though). I've also used the standard CTIO extiction curve instead of deriving my own (which I did for the earlier spectrum) as recommended by Jack Baldwin here. Other info on the spectrum * it was taken 25.05 Jan UT * it is a combination of 3 exposures, with a TOTAL exposure time of 1500 seconds * it was taken with a 3" slit under photometric or near near photometric conditions * seeing was approximately 1.1" * it was taken at 1.02 airmasses (basically overhead) so there should be no problem with differential refraction * Taken on the CTIO 1.5m telescope with the Cassegrain Spectrograph and a 150 line/mm grating (#13) Mark Phillips and I just ran his synthetic photometry program on this spectrum, and obtained B=12.850 V=12.655 for this spectrum (with the errors being at the hundredths level from the synthetic photometry, but maybe up to the .1 level for spectrophotometry) . Now the local photometry gives V=12.70 at 25.11 Jan UT, so the above value is not too far from right. So I have NOT adjusted the flux scale (except, as I said, for recalculating the flux calibration with calibrators that go out past 8000 A and redoing the extinction correction... these changed the flux scale a bit. Nick (via Mark) tells me that the Vmax was at about 20.9+-0.5 Jan UT, and that it peaked at about Vmax of 12.60+-0.1. You (or Bob) should be getting additional info from Mark soon about the availability of additional spectra. Hope this all helps out! Cheers, Chris OBJ: ``Typical'' SN Ia 1992a in NGC 1380 DATE: Jan. 25 1992 (6 days after B maximum on Jan. 19.2 UT). This is from days 24 after explosion using the 18 day rule. OBS: CTIO: Chris Smith REP: F_lambda (cgs) vs. lambda (ang) COR: not derreddened (estimated E(B-V)=0.) or deredshifted (heliocentric velocity 1809 km/s) REF: Kirshner et al. 1993, ApJ, 415, 589 92a.short,i_title = 92A.SHORT[1/1] DAY: 24. END: 3398. 1.71300E-14 3406.27 1.89803E-14 3414.54 1.96655E-14 3422.81 1.97433E-14 3431.08 2.05257E-14 3439.35 1.95316E-14 3447.62 2.02444E-14 3455.89 2.09860E-14 3464.16 2.10578E-14 3472.43 2.12074E-14 3480.7 2.09627E-14 3488.97 2.19223E-14 3497.24 2.36537E-14 3505.51 2.43960E-14 3513.78 2.56308E-14 3522.05 2.70182E-14 3530.32 2.97763E-14 3538.59 3.03485E-14 3546.86 3.28201E-14 3555.13 3.26695E-14 3563.4 3.26466E-14 3571.67 3.52009E-14 3579.94 3.61574E-14 3588.21 3.54935E-14 3596.48 3.64973E-14 3604.75 3.49656E-14 3613.02 3.53903E-14 3621.29 3.41466E-14 3629.56 3.36254E-14 3637.83 3.42540E-14 3646.1 3.62759E-14 3654.37 4.00368E-14 3662.64 4.16435E-14 3670.91 4.32987E-14 3679.18 4.49707E-14 3687.45 3.93394E-14 3695.72 3.61701E-14 3703.99 3.43135E-14 3712.26 3.14238E-14 3720.53 2.96282E-14 3728.8 2.83553E-14 3737.07 2.79380E-14 3745.34 2.67283E-14 3753.61 2.62197E-14 3761.88 2.40709E-14 3770.15 2.33923E-14 3778.42 2.16231E-14 3786.69 2.19966E-14 3794.96 2.21696E-14 3803.23 2.19130E-14 3811.5 2.31369E-14 3819.77 2.47251E-14 3828.04 2.60539E-14 3836.31 2.91577E-14 3844.58 3.10024E-14 3852.85 3.34997E-14 3861.12 3.92547E-14 3869.39 4.23217E-14 3877.66 4.55531E-14 3885.93 5.03140E-14 3894.2 5.52279E-14 3902.47 5.89077E-14 3910.74 6.21708E-14 3919.01 6.45801E-14 3927.28 6.57196E-14 3935.55 6.75202E-14 3943.82 6.94876E-14 3952.09 6.76884E-14 3960.36 6.61465E-14 3968.63 6.22432E-14 3976.9 6.05707E-14 3985.17 5.56307E-14 3993.44 5.10362E-14 4001.71 4.87136E-14 4009.98 4.63781E-14 4018.25 4.52573E-14 4026.52 4.54829E-14 4034.79 4.59634E-14 4043.06 4.87056E-14 4051.33 5.01209E-14 4059.6 5.17289E-14 4067.87 5.37579E-14 4076.14 5.66510E-14 4084.41 5.84963E-14 4092.68 5.69220E-14 4100.95 5.79047E-14 4109.22 5.78718E-14 4117.49 5.84853E-14 4125.76 6.04612E-14 4134.03 5.68511E-14 4142.3 5.92098E-14 4150.57 5.97637E-14 4158.84 5.76183E-14 4167.11 6.03609E-14 4175.38 5.97501E-14 4183.65 6.11832E-14 4191.92 6.01489E-14 4200.19 6.13804E-14 4208.46 5.91013E-14 4216.73 6.01993E-14 4225. 5.91303E-14 4233.27 5.75284E-14 4241.54 5.62081E-14 4249.81 5.45742E-14 4258.08 5.30340E-14 4266.35 5.19947E-14 4274.62 5.04006E-14 4282.89 4.93605E-14 4291.16 4.58628E-14 4299.43 4.32654E-14 4307.7 4.03683E-14 4315.97 3.80250E-14 4324.24 3.62330E-14 4332.51 3.52241E-14 4340.78 3.52193E-14 4349.05 3.49492E-14 4357.32 3.46809E-14 4365.59 3.48508E-14 4373.86 3.43600E-14 4382.13 3.41816E-14 4390.4 3.36396E-14 4398.67 3.32989E-14 4406.94 3.36073E-14 4415.21 3.35239E-14 4423.48 3.41645E-14 4431.75 3.49641E-14 4440.02 3.62886E-14 4448.29 3.72390E-14 4456.56 3.93098E-14 4464.83 4.13303E-14 4473.1 4.22841E-14 4481.37 4.30170E-14 4489.64 4.59639E-14 4497.91 4.65113E-14 4506.18 4.86542E-14 4514.45 5.09208E-14 4522.72 5.15470E-14 4530.99 5.46635E-14 4539.26 5.54744E-14 4547.53 5.74465E-14 4555.8 5.84165E-14 4564.07 5.93813E-14 4572.34 5.97902E-14 4580.61 5.92885E-14 4588.88 5.90567E-14 4597.15 5.97511E-14 4605.42 5.90126E-14 4613.69 5.86106E-14 4621.96 5.80982E-14 4630.23 5.83101E-14 4638.5 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3.27984E-14 5060.27 3.31510E-14 5068.54 3.32095E-14 5076.81 3.40459E-14 5085.08 3.51786E-14 5093.35 3.56259E-14 5101.62 3.54753E-14 5109.89 3.68208E-14 5118.16 3.74450E-14 5126.43 3.78078E-14 5134.7 3.80318E-14 5142.97 3.88348E-14 5151.24 3.98267E-14 5159.51 4.01811E-14 5167.78 4.17579E-14 5176.05 4.18617E-14 5184.32 4.21153E-14 5192.59 4.27030E-14 5200.86 4.23824E-14 5209.13 4.17294E-14 5217.4 4.22415E-14 5225.67 4.27927E-14 5233.94 4.33827E-14 5242.21 4.38101E-14 5250.48 4.31250E-14 5258.75 4.31759E-14 5267.02 4.20975E-14 5275.29 4.08242E-14 5283.56 3.79740E-14 5291.83 3.52026E-14 5300.1 3.36801E-14 5308.37 3.25165E-14 5316.64 3.14484E-14 5324.91 3.09636E-14 5333.18 3.07193E-14 5341.45 3.11428E-14 5349.72 3.14007E-14 5357.99 3.16255E-14 5366.26 3.20715E-14 5374.53 3.17171E-14 5382.8 3.24814E-14 5391.07 3.29699E-14 5399.34 3.23425E-14 5407.61 3.19763E-14 5415.88 3.20607E-14 5424.15 3.20117E-14 5432.42 3.21091E-14 5440.69 3.11717E-14 5448.96 3.08157E-14 5457.23 2.98024E-14 5465.5 2.89962E-14 5473.77 2.74511E-14 5482.04 2.68898E-14 5490.31 2.58861E-14 5498.58 2.50543E-14 5506.85 2.46116E-14 5515.12 2.46029E-14 5523.39 2.51758E-14 5531.66 2.57603E-14 5539.93 2.69729E-14 5548.2 2.86082E-14 5556.47 3.01740E-14 5564.74 3.12827E-14 5573.01 3.23544E-14 5581.28 3.33197E-14 5589.55 3.35205E-14 5597.82 3.33482E-14 5606.09 3.35467E-14 5614.36 3.39238E-14 5622.63 3.33114E-14 5630.9 3.28607E-14 5639.17 3.32995E-14 5647.44 3.34369E-14 5655.71 3.26759E-14 5663.98 3.23679E-14 5672.25 3.20211E-14 5680.52 3.16024E-14 5688.79 3.12698E-14 5697.06 3.09847E-14 5705.33 3.10551E-14 5713.6 3.05631E-14 5721.87 2.99735E-14 5730.14 2.97707E-14 5738.41 2.86912E-14 5746.68 2.75492E-14 5754.95 2.71060E-14 5763.22 2.64595E-14 5771.49 2.57985E-14 5779.76 2.56845E-14 5788.03 2.53451E-14 5796.3 2.56922E-14 5804.57 2.62894E-14 5812.84 2.66790E-14 5821.11 2.73178E-14 5829.38 2.84539E-14 5837.65 2.97377E-14 5845.92 3.04936E-14 5854.19 3.12118E-14 5862.46 3.18457E-14 5870.73 3.27698E-14 5879. 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2.38430E-14 6300.77 2.45939E-14 6309.04 2.53217E-14 6317.31 2.55952E-14 6325.58 2.57675E-14 6333.85 2.57798E-14 6342.12 2.59059E-14 6350.39 2.62052E-14 6358.66 2.60140E-14 6366.93 2.60261E-14 6375.2 2.60861E-14 6383.47 2.59477E-14 6391.74 2.60005E-14 6400.01 2.57777E-14 6408.28 2.55752E-14 6416.55 2.54863E-14 6424.82 2.53473E-14 6433.09 2.53714E-14 6441.36 2.53590E-14 6449.63 2.51767E-14 6457.9 2.50458E-14 6466.17 2.50576E-14 6474.44 2.44547E-14 6482.71 2.40825E-14 6490.98 2.39707E-14 6499.25 2.38512E-14 6507.52 2.38538E-14 6515.79 2.32284E-14 6524.06 2.30550E-14 6532.33 2.28617E-14 6540.6 2.26343E-14 6548.87 2.23579E-14 6557.14 2.18539E-14 6565.41 2.15781E-14 6573.68 2.12732E-14 6581.95 2.06574E-14 6590.22 2.07101E-14 6598.49 2.00405E-14 6606.76 1.94155E-14 6615.03 1.93972E-14 6623.3 1.91195E-14 6631.57 1.87416E-14 6639.84 1.84420E-14 6648.11 1.81382E-14 6656.38 1.79764E-14 6664.65 1.77957E-14 6672.92 1.76750E-14 6681.19 1.70534E-14 6689.46 1.66819E-14 6697.73 1.67726E-14 6706. 1.63875E-14 6714.27 1.63546E-14 6722.54 1.60395E-14 6730.81 1.57792E-14 6739.08 1.56250E-14 6747.35 1.54001E-14 6755.62 1.50740E-14 6763.89 1.49878E-14 6772.16 1.49578E-14 6780.43 1.45928E-14 6788.7 1.44876E-14 6796.97 1.43122E-14 6805.24 1.40124E-14 6813.51 1.38286E-14 6821.78 1.39650E-14 6830.05 1.39428E-14 6838.32 1.38771E-14 6846.59 1.38962E-14 6854.86 1.36626E-14 6863.13 1.26814E-14 6871.4 1.13457E-14 6879.67 1.19600E-14 6887.94 1.20629E-14 6896.21 1.19231E-14 6904.48 1.22087E-14 6912.75 1.24444E-14 6921.02 1.25906E-14 6929.29 1.24964E-14 6937.56 1.24726E-14 6945.83 1.23349E-14 6954.1 1.22518E-14 6962.37 1.21439E-14 6970.64 1.20086E-14 6978.91 1.19065E-14 6987.18 1.18468E-14 6995.45 1.16614E-14 7003.72 1.17538E-14 7011.99 1.18637E-14 7020.26 1.17215E-14 7028.53 1.16265E-14 7036.8 1.14728E-14 7045.07 1.14733E-14 7053.34 1.11992E-14 7061.61 1.13466E-14 7069.88 1.12796E-14 7078.15 1.10891E-14 7086.42 1.10094E-14 7094.69 1.09185E-14 7102.96 1.11982E-14 7111.23 1.09206E-14 7119.5 1.07649E-14 7127.77 1.07626E-14 7136.04 1.05616E-14 7144.31 1.04394E-14 7152.58 1.05073E-14 7160.85 1.04575E-14 7169.12 1.03073E-14 7177.39 1.01189E-14 7185.66 9.79247E-15 7193.93 9.73586E-15 7202.2 9.84563E-15 7210.47 1.01220E-14 7218.74 1.02366E-14 7227.01 1.00133E-14 7235.28 9.92949E-15 7243.55 9.84223E-15 7251.82 9.89776E-15 7260.09 9.99774E-15 7268.36 9.92176E-15 7276.63 9.87662E-15 7284.9 1.00550E-14 7293.17 9.99744E-15 7301.44 1.00086E-14 7309.71 9.94124E-15 7317.98 9.82294E-15 7326.25 9.76524E-15 7334.52 9.78875E-15 7342.79 9.81490E-15 7351.06 9.61731E-15 7359.33 9.45717E-15 7367.6 9.31971E-15 7375.87 9.06761E-15 7384.14 8.83574E-15 7392.41 8.58149E-15 7400.68 8.30903E-15 7408.95 8.05123E-15 7417.22 7.84970E-15 7425.49 7.63050E-15 7433.76 7.16738E-15 7442.03 6.76266E-15 7450.3 6.49762E-15 7458.57 6.16021E-15 7466.84 5.77679E-15 7475.11 5.64308E-15 7483.38 5.49770E-15 7491.65 5.20343E-15 7499.92 5.08690E-15 7508.19 5.13273E-15 7516.46 5.17490E-15 7524.73 5.33896E-15 7533. 5.32324E-15 7541.27 5.23611E-15 7549.54 5.28107E-15 7557.81 5.41453E-15 7566.08 5.59586E-15 7574.35 5.72193E-15 7582.62 5.59915E-15 7590.89 4.86760E-15 7599.16 3.45094E-15 7607.43 2.98181E-15 7615.7 3.92422E-15 7623.97 4.39342E-15 7632.24 4.12176E-15 7640.51 4.53550E-15 7648.78 5.28312E-15 7657.05 6.04497E-15 7665.32 6.56693E-15 7673.59 6.85285E-15 7681.86 7.05624E-15 7690.13 7.35383E-15 7698.4 7.63681E-15 7706.67 7.65963E-15 7714.94 8.04395E-15 7723.21 8.02033E-15 7731.48 7.92401E-15 7739.75 7.85667E-15 7748.02 8.10240E-15 7756.29 8.14864E-15 7764.56 7.99685E-15 7772.83 8.25682E-15 7781.1 8.25595E-15 7789.37 8.33253E-15 7797.64 8.49149E-15 7805.91 8.60360E-15 7814.18 8.55293E-15 7822.45 8.57061E-15 7830.72 8.67215E-15 7838.99 9.00857E-15 7847.26 9.13872E-15 7855.53 9.18213E-15 7863.8 9.04518E-15 7872.07 9.03894E-15 7880.34 9.14302E-15 7888.61 9.33856E-15 7896.88 9.38233E-15 7905.15 9.47169E-15 7913.42 9.57130E-15 7921.69 9.52789E-15 7929.96 9.44521E-15 7938.23 9.35241E-15 7946.5 9.08590E-15 7954.77 9.34313E-15 7963.04 9.14938E-15 7971.31 8.97786E-15 7979.58 8.98871E-15 7987.85 8.83775E-15 7996.12 9.01287E-15 8004.39 8.99704E-15 8012.66 8.91737E-15 8020.93 8.42164E-15 8029.2 8.60851E-15 8037.47 8.42417E-15 8045.74 8.22964E-15 8054.01 8.35838E-15 8062.28 8.23320E-15 8070.55 8.25057E-15 8078.82 7.67605E-15 8087.09 7.53764E-15 8095.36 7.54600E-15 8103.63 7.24251E-15 8111.9 7.30916E-15 8120.17 6.96854E-15