DZ Andromedae and UV Cassiopeiae

DZ Andromedae is listed as a R CrB-type variable having a magnitude
range of "10.0 - (14.0" on the AAVSO chart. When using the AAVSO's
light curve generator, I see the star at a nearly constant 10th
magnitude for several decades. When was DZ Andromedae at 14th
magnitude?

Similar question for UV Cassiopeiae - it is listed as an R CrB star of
range "11.8 - 16.5p", but has shown little variation from magnitude
11.0 for decades. When was it faint?

In other words, what is the reason for the listed faint-end magnitudes
for these two objects?

Thank you.

wrote:

DZ Andromedae is listed as a R CrB-type variable having a magnitude
range of "10.0 - (14.0" on the AAVSO chart. When using the AAVSO's
light curve generator, I see the star at a nearly constant 10th
magnitude for several decades. When was DZ Andromedae at 14th
magnitude?

Similar question for UV Cassiopeiae - it is listed as an R CrB star of
range "11.8 - 16.5p", but has shown little variation from magnitude
11.0 for decades. When was it faint?

In other words, what is the reason for the listed faint-end magnitudes
for these two objects?

See http://www.astrosurf.com/buil/us/peculiar2/rcrb.htm for a pretty
good explanation.

--
Greg Crinklaw
Astronomical Software Developer
Cloudcroft, New Mexico, USA (33N, 106W, 2700m)

SkyTools: http://www.skyhound.com/cs.html
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To reply have a physician remove your spleen

wrote:
DZ Andromedae is listed as a R CrB-type variable having a magnitude
range of "10.0 - (14.0" on the AAVSO chart. When using the AAVSO's
light curve generator, I see the star at a nearly constant 10th
magnitude for several decades. When was DZ Andromedae at 14th
magnitude?

Similar question for UV Cassiopeiae - it is listed as an R CrB star of
range "11.8 - 16.5p", but has shown little variation from magnitude
11.0 for decades. When was it faint?

In other words, what is the reason for the listed faint-end magnitudes
for these two objects?

Thank you.

Allison - Several of the stars currently classed as of the R CrB-type
honestly have questionable association with this group. But R CrB's are
extremely rare and perhaps differ dramatically one to another in the
intervals separating their fadings.

DZ And had a single reported minimum around 1960 according to T.Cragg
and nothing since. UV Cas had a significant minimum about 1940 and
perhaps another brief event in the 1960's. It is worth noting that the
spectra of both of these stars is not of the classic R CrB-type.

JBortle

DZ Andromedae is no longer regarded as an RCB star. Indeed, it is
probably not even variable (at least not at the level to be worth
observing visually).

Its spectum is that of a K2 III star with normal hydrogen abundance ("Is
DZ Andromedae an R Coronae Borealis variable?", Aruna Goswami, N.
Kameswara Rao, and David L. Lambert, The Observatory, vol. 118, p.
213-218, 1998).

Also, I seem to remember that some photos taken at a German observatory
show the star at maximum close to the time that Cragg reported it in
minimum.