wpo - session spectra - 2004 April
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Semi-Regulars ...WPO
Rho Cas ...2003
Nov 2003
Dec 2004
Jan
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poor overcast skies for Feb/March 2004 with only
the visual observation of the planets Mercury - Saturn on view.
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AB Boo revisited - see 1999 June 21/22 here
- a Boo here.
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PNe NGC 3242 [Ghost of Jupiter] in Hyd at -18o in
haze! Note zero order real image as bright as Ha
image shows grating efficiency.
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PNe NGC 2392 [Eskimo] in Gem in 20s exposure; PNe
2438 in M46 Pup in 60s exp.
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R Leo recorded as an IR emitter despite brevity of
exposure with little radiation in visible eg faint visually - range Mv
4.4-11.3 -see a Leo.
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RX LMi and CO UMa of comparable magnitude and essentially
identical M4 spectra ! DH Leo K-type spectrum [see a
Boo] with Period=1.07d.
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T CrB retaken to better resolution near minimum.
CF Boo revisit -see here
for 1999 June.
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Two LB vars in same Serpens field! BC CMi;
BP Cnc; DF Leo have similar spectra.
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R Cnc - a Mira near minimum as IR emitter [like R
Leo here].
May 1866: The
recurrent nova T CrB has
become the first cataclysmic variable (CV) studied spectroscopically when
it reached the brightness of 2nd magnitude during its outburst. Huggins
(1866) then observed the hydrogen emissions superimposed on a weak absorbtion-line
spectrum through a visual spectroscope. The object was studied intensively
immediately after its second outburst in February 1946 when T CrB became
the brightest recurrent nova in history. The photometric observations were
published by Pettit (1946) who compared the development of the light curves
of both large outbursts of this nova that have been recorded up to now,
i.e., in 1866 and 1946.
text & images copyright - Maurice Gavin 2004
