ECLIPSING DWARF NOVAE PROGRAMME UPDATE
MAY 2007
ROGER PICKARD

I’m grateful to Bill Worraker for providing the following update to this programme. There
are now only 13 stars left on this programme and it would be nice if observers (both
visual and CCD) could supply some concentrated coverage to see if any of these stars
are eclipsing dwarf novae.

Below are notes on current programme stars. Those to be dropped from now on are
marked:

AR And 4.0 hours photometry received to date, no sign of eclipses.

FO And 1.68 hours photometry (Thorstensen et al 1996), no eclipses.

KV And 3 orbits covered (Kato et al 1994), no eclipses > DROP

TT Boo Many orbits covered (Olech et al 2004), no eclipses > DROP

AT Cnc 1orbit + 2 part orbits covered (Nogami et al 1999), no eclipses (also deduced
to have low inclination.) > DROP

CC Cnc Many orbits covered (Kato et al 2002), no eclipses > DROP

GX Cas 3-4 orbits covered (Nogami et al 1998, Nick James), no eclipses > DROP

KU Cas No data (not even an orbital period), published or unpublished.

SV CMi No photometry.

V516 Cyg 4.1 hrs photometry (Nick James), no eclipses.

V1060 Cyg No data, published or unpublished.

ES Dra 1.5 orbits (Misselt+Shafter 1995), 1.4+1.6 orbits (CBA Belgium 2001). No
eclipses, but flickering noted - keep on programme as outburst behaviour
is uncertain and P_orb has been revised downward to approximately 3
hours (type SU UMa?)

AW Gem 4 orbits covered (Kato 1996), no eclipses > DROP

SX LMi Many orbits covered (Nogami et al 1997, Wagner et al 1998), no eclipses/low
inclination > DROP

CY Lyr Bits of photometry (0.6+0.4 orbits), no eclipses.

LL Lyr No photometry.

V344 Lyr 4 orbits covered (Kato et al 1993), no eclipses > DROP

V426 Oph 0.9+0.75orbits covered (Hollander et al 1993); no eclipses (inclination 59+/-6
deg, Hessman 1988), but a strange object which deserves some attention.

HX Peg No photometry.

TZ Per 0.9+0.8 orbits covered (Nick James; Mumford 1966), no eclipses > DROP

PY Per No photometry;

CI UMa 4 orbits covered (Nogami+Kato 1997), no eclipses > DROP

HS Vir Some orbital photometry (Kato et al 1998), no eclipses -> DROP

VW Vul Some orbital photometry (Kato 1999), no eclipses > DROP

FY Vul No data, published or unpublished.

The Programme therefore becomes:


Object Name    Coordinates            Type    Min    Max     T1     P_orb(h)    
Altern.Name     (J2000)                                      T2     P_shu(h)
-----------------------------------------------------------------------------
AR And         01 45 03.27             UG?    16.9   11.0    25     3.91(DS2) 
               +37 56 33.3

FO And         01 15 32.1              SU     17.5   13.5    15-23  1.7186
               +37 37 36                                            1.779

KU Cas         01 31 02.6              UG     18p    13.3p    ??      ??
(DS)           +57 54 12.3

SV CMi         07 31 08.5              ZC     16.3   13      16     3.74
               + 05 58 47

V516 Cyg       20 47 09.9              UG     16.8p  13.8p    ??      ??
(DS)           +41 55 26

V1060 Cyg      21 7 42.3               UG     18p    13.5p    ??      ??
(DS)           +37 14 08.3

ES Dra (DS2)   15 25 31.8              DN?    16.3p  13.9p    ??    4.238
PG 1524+622    +62 1 00.1

CY Lyr         18 52 41.41             UG?    17.0   13.2     ??    3.82
(DS2)          +26 45 29.9

LL Lyr         18 35 12.91             UG?    17.1   12.8     ??      ??
(DS2)          +38 20 04.3

V426 Oph       18 7 51.8               ZC     13.4   11.5    17-55  6.847
               +05 51 48

HX Peg         23 40 23.8              ZC     16.6   12.0      9    4.819
PG 2337+123    +12 37 41

PY Per         02 50 00.2              ZC     19.8   13.0      8    3.715
               +37 39 22

FY Vul         19 41 40                ZC     15.3B  13.4B     ??     ??
(DS)           +21 45 59

Symbols:
DS Data taken from Downes and Shara, PASP 105, 127 (1993)
DS2 Data taken from Downes, Webbink and Shara, PASP 109, 345 (1997)
p photographic magnitude
T1 Normal outburst interval (days)
T2 Superoutburst interval (days)
DN Dwarf Nova
UG Dwarf Nova, U Gem type
ZC Dwarf Nova, Z Cam type
SU Dwarf Nova, SU UMa type