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Now that five papers on CVs in the Sloan Digital Sky Survey (SDSS) are publicly available,
I thought it was time to evaluate these discoveries to search out the ones most likely to pay dividends for amateurs monitoring
them with CCDs on .5m telescopes and smaller.
The first step in the process was to eliminate most of the previously known CVs from
the list. Most of these have been well monitored for some time and AAVSO charts with Henden photometry exist for nearly all
of them. Out of the 185 stars with SDSS spectra 154 are new discoveries. Follow up study of these systems is more likely to
bear new fruit.
The next criterion was to concentrate on objects most likely to exhibit outbursts. Most
of the SDSS CVs are very faint in quiescence. They are only likely to be noticed by amateurs when they brighten to 15th
magnitude or better. For the most part, that meant concentrating on disk objects (DN and NL). Detection of outbursts and determining
the outburst cycles, orbital and/or superhump periods is well within the expertise of many amateur astronomers.
Proven and suspected magnetic systems were generally excluded, unless they exhibited
high and low states in the data. This may seem subjective, but the reasoning was that most of the characteristics of SW Sex
systems are only detectable spectroscopically, and faint, low-mass accretion rate polars and IPs would be less active and
more problematic for smaller telescopes.
In searching the literature, another bright CV previously identified as a SDSS QSO has
turned out to be a DN. It was detected in outburst by ROTSE IIIb March 24, 2006. Another previously unidentified SDSS QSO
turned out to be a DN, but it is excluded here because it never got brighter than mag 16.7. See: Outburst of CV SDSSp J161332-000331
and Vir4/1432-0033 Yuan, F.; Rykoff, E. S.; the ROTSE Collaboration 2006ATel..694....1Y for details.
After culling the list of 185 SDSS CVs and adding the ROTSE IIIb detection, I find 82
objects worthy of consideration for amateur follow up observations. Table 1 lists these CVs in order of increasing RA.
Mike Simonsen
January 31, 2007
|
# |
SDSS J 2000 |
Paper |
g mag |
P(hrs) |
Type |
Comments |
| |
001856.93+345444.3 |
4 |
17.82 |
|
NL |
Low incl. disk system |
| |
004335.14-003729.8 |
3 |
19.84 |
1.3: |
WZ: |
|
| |
013132.39-090122.3 |
2 |
18.27 |
1.6 |
|
Low MTR, ASAS 1 pt 13.5 |
| |
013701.06-091234.9 |
2 |
18.69 |
1.4 |
UGSU |
Low MTR, hi incl., ASAS 3 outbursts to 12.5
spaced 500d, 2003 outburst well covered |
| |
015151.87+140047.2 |
1 |
20.26 |
|
DN/UG |
H. Maehara 20070108 outburst 15.78V |
| |
015543.40+002807.2 |
1 |
15.39 |
|
Polar+ecl |
Hi and Low states |
| |
023322.61+005059.5 |
1 |
19.94 |
1.5 |
IP: |
RASS X-ray detection, ASAS detection 14.9 |
| |
031051.66-075500.3 |
2 |
15.49 |
|
UGSU |
|
| |
040714.78-064425.1 |
2 |
17.75 |
3.96 |
UG+E |
Eclipsing, hi incl., ASAS pts 14.0 |
| |
074355.56+183834.8 |
5 |
20.08 |
|
DN: |
Hi and low states |
| |
074531.92+453829.6 |
5 |
19.05 |
|
|
Pulsating WD? |
| |
074640.62+173412.8 |
5 |
18.17 |
|
DN: |
Hi and low states |
| |
074813.54+290509.2 |
3 |
18.62 |
2.5:: |
NL |
Not a polar, CV is southeastern component of close pair |
| |
075939.79+191417.3 |
5 |
18.19 |
|
|
Strong HeII, but not magnetic |
| |
080142.37+210345.8 |
4 |
18.84 |
|
DN: |
|
| |
080303.90+251627.0 |
4 |
19.59 |
1.7 |
DN: |
|
| |
080434.20+510349.2 |
5 |
17.86 |
1.42 |
UGSU
(WZ) |
J. Shears outburst 20060306 13.13C |
| |
080846.19+313106.0 |
3 |
19.43 |
|
DN/UG |
Outbursts to 14.5V, 0.04 mag variation on 6 hr timescale needs confirmation |
| |
081321.91+452809.4 |
1 |
18.29 |
|
DN: |
Long period, K-M secondary, like TT Crt |
| |
081352.02+281317.3 |
4 |
17.16 |
2.7 |
|
HeII system in period gap |
| |
081610.84+453010.2 |
1 |
20.08 |
|
WZ: |
Low MTR |
| |
082457.15+073702.4 |
5 |
18.57 |
|
DN: |
Hi and low states |
| |
084400.10+023919.3 |
2 |
18.34 |
|
WZ: |
Low MTR, outburst detected 15th mag |
| |
090016.56+430118.2 |
3 |
18.88 |
5.3: |
|
|
| |
090103.93+480911.1 |
2 |
19.26 |
|
|
Hi incl. |
| |
090350.73+330036.1 |
4 |
18.84 |
1.3: |
|
Hi incl., short Porb |
| |
090403.48+035501.2 |
3 |
19.24 |
1.4 |
|
Eclipsing |
| |
090452.09+440255.4 |
3 |
19.38 |
|
WZ: |
Secondary visible, low MTR? |
| |
090628.25+052656.9 |
4 |
18.76 |
|
DN/UG |
USNO caught it 15.5 |
| |
091137.36+084140.8 |
4 |
19.73 |
4.99 |
|
|
| |
091945.11+085710.0 |
4 |
18.20 |
1.4 |
ZZ Cet? |
Resembles GW Lib, pulsating WD? |
| |
092009.54+004244.9 |
2 |
17.45 |
3.6 |
|
Eclipsing, hi incl. |
| |
093214.82+495054.7
(NSV 18223) |
5 |
17.45 |
10.04 |
|
UMa6 (NSVS18223), long period |
| |
093249.57+472523.0 |
3 |
17.81 |
1.7: |
|
Not SW Sex or polar, unusual doubled He emission lines= disk origin |
| |
093836.98+071455.1
(NSV 18241) |
4 |
18.32 |
4.48 |
DN |
(Leo7, PG0935) Several outbursts detected
1973 (Palomar-Green),
2002 (ASAS-3), 2003 (ASAS-3), 2004 (Schmeer) 2005 (Schmeer) |
| |
095135.21+602939.6 |
3 |
20.02 |
|
WZ: |
Secondary visible, low MTR? |
| |
102320.27+440509.8
(NSV 4838) |
4 |
18.83 |
|
UGSU |
NSV 4838 (UMa 8) |
| |
103147.99+085224.3 |
4 |
18.79 |
|
|
Schmeer reports 15.5C June 2005 |
| |
103533.03+055158.4 |
5 |
18.82 |
1.33 |
|
Eclipsing CV with a brown dwarf |
| |
113551.09+532246.2 |
Atel #787 |
--- |
--- |
DN |
Mis-ID as QSO, detected by ROTSE in outburst 20060324
15.1C |
| |
114628.80+675909.7 |
2 |
18.78 |
|
DN/UG |
|
| |
115639.48+630907.7 |
3 |
20.73 |
|
|
Mystery star, defies classification thus far |
| |
120231.01+450349.1 |
5 |
19.97 |
|
DN |
ROTSE detection 20060321
13.4C |
| |
121607.03+052013.9 |
3 |
20.12 |
1.35 |
|
Extreme mass ratio implies high mass WD or brown dwarf mass secondary |
| |
122740.83+513925.0 |
5 |
19.10 |
|
|
|
| |
123813.73-033933.0 |
2 |
17.82 |
1.27 |
UGWZ |
Hi incl., low MTR, short Porb |
| |
124325.92+025547.5 |
2 |
18.30 |
|
|
ASAS 1 pt 13.34 |
| |
124426.26+613514.6 |
3 |
18.76 |
|
DN |
NSVS outburst 14.6 |
| |
125023.85+665525.5 |
2 |
18.70 |
5.6: |
|
Hi incl. |
| |
133540.76+050722.7 |
3 |
18.46 |
|
|
Mystery star |
| |
133941.12+484727.5 |
4 |
17.64 |
|
ZZ Cet? |
Many unresolved issues, pulsating WD? |
| |
145758.21+514807.9 |
4 |
19.54 |
|
|
Hi incl., pulsating WD? |
| |
1501.37.22+550123.4 |
3 |
19.40 |
1.3 |
WZ: |
Eclipsing |
| |
150240.98+333423.9 |
5 |
17.57 |
1.40 |
|
Eclipsing |
| |
150722.33+523039.8 |
4 |
18.36 |
1.12 |
|
Eclipsing, pulsating WD? |
| |
153817.35+512338.0 |
3 |
18.61 |
1.6: |
DN/UG |
|
| |
155644.24-000950.2 |
1 |
18.05 |
|
UG |
ASAS 3 pts to 12.5
H. Maehara reports outbursts 20050211, 20060303, 20060531 A. Imada
reports outburst 20050526 |
| |
155656.92+352336.6 |
5 |
18.39 |
2.14 |
|
Eclipsing, hi incl. |
| |
161030.35+445901.7 |
3 |
19.81 |
|
WZ: |
Low MTR? |
| |
161332.56-000331.0 |
1 |
18.63 |
|
DN/UG |
ROTSE detection 20060115
15.5C
Schmeer detects outburst April 2004 |
| |
162830.89+240259.1 |
5 |
19.79 |
|
|
|
| |
163605.01+465204.5 |
2 |
16.72 |
|
DN/UG |
NSVS 1 pt 14.1 |
| |
163722.21-001957.1 |
1 |
16.56 |
|
UGSU |
Detected in outburst March 28, 2004 by Stubbings. UGSU nature established by G. Bolt. CV is northernmost of close pair |
| |
165359.06+201010.4 |
5 |
17.53 |
1.58sh |
UGSU |
Superhumps observed |
| |
165658.13+212139.3 |
4 |
18.52 |
|
|
X-ray emissions, disk system? |
| |
170213.26+322954.1 |
3 |
17.92 |
2.5 |
UGSU |
Eclipsing, DN in the period gap.
P. Schmeer records first outburst 20050930 13.7CR |
| |
170542.54+313240.8 |
3 |
19.67 |
|
WZ: |
Low MTR? |
| |
171145.08+301320.0 |
3 |
20.25 |
|
WZ: |
Low MTR? |
| |
171247.71+604603.3 |
1 |
19.95 |
|
|
CV is southern component of close pair, unknown qualities |
| |
173008.38+624754.7 |
1 |
15.92 |
2.0 |
UGSU |
Well known since 2001 |
| |
204448.92-045928.8 |
2 |
16.86 |
|
|
ASAS 7 pts to 14.0 |
| |
205914.87-061220.5 |
2 |
18.38 |
|
|
Tom Marsh reports outburst 09262006 ~16.6V(Boyd) |
| |
210014.12+004446.0 |
3 |
18.78 |
1.9 |
UGSU |
ASAS 4 pts 14.8V
Quiescent superhumps
Schmeer reports mag15 April 2005 |
| |
210131.26+105251.5 |
2 |
18.08 |
1.0: |
|
Low states, MCV?, lg. amp. variations |
| |
210241.09-004408.3 |
3 |
17.22 |
|
|
Mystery star |
| |
210449.95+010545.9 |
5 |
17.05 |
|
DN: |
Hi and low states, NSVS 14.6 |
| |
211605.43+113407.5 |
3 |
15.31 |
|
DN: |
SDSS outburst at 15.3
USNO has it at 20V |
| |
214354.60+124458.0 |
4 |
16.19 |
|
DN: |
ASAS 4 pts 14.4 |
| |
223252.35+140353.0 |
3 |
17.69 |
|
DN |
USNO has 2 outbursts under poor conditions |
| |
223439.93+004127.2 |
2 |
18.10 |
2.0 |
DN |
ASAS 1 pt 14.0 |
| |
225831.18-094931.7 |
2 |
15.61 |
|
UGSU |
Low incl. CV, bright!, ASAS many 12.2V pts
H. Maehara reports outbursts 20050601, 20050831 |
| |
230351.64+010651.0 |
1 |
19.05 |
1.67: |
DN/UG |
Ian Miller reports outburst 20060829 [14.5C] |
Table 1 key to columns
- List number.
- SDSS coordinates (J2000). Can be read as SDSS J or pJ names per nomenclature.
- SDSS CV paper (1-5) the variable is found in, or Atel announcement #
- g magnitude as listed in the original paper (roughly corresponds to V magnitude)
- Orbital period in hours if known. := uncertain, sh = superhump period
- Type or suspected type. WZ: = UGSU(WZ) suspect, UGSU = outbursts and superhumps observed, DN = dwarf nova,
DN: = suspected dwarf nova, ZZ Cet = pulsating white dwarf primary, AM Her: = polar suspect, IP: = suspect intermediate polar.
Comments include information from original papers, information from subsequent papers, information from Atel,
CVnet and VSNET mail lists, ASAS and NSVS detections and notes from USNOFS observations (Henden).
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References
Query Results from the ADS Database (2006 only)
An Illustration of Modeling Cataclysmic Variables: HST, FUSE, and SDSS Spectra of SDSS J080908.39+381406.2
Linnell, Albert P.; Hoard, D. W.; Szkody, Paula; Long, Knox S.; Hubeny, Ivan; Gänsicke, Boris; Sion, Edward
M.
2007ApJ...654.1036L
Two Additions to the New Class of Low Accretion Rate Magnetic Binaries
Schmidt, Gary D.; Szkody, Paula; Henden, Arne; Anderson, Scott F.; Lamb, Don Q.; Margon, Bruce; Schneider,
Donald P.
2007ApJ...654..521S
The nature of the close magnetic white dwarf + probable brown dwarf binary SDSSJ121209.31+013627.7
Burleigh, M. R.; Marsh, T. R.; Gänsicke, B. T.; Goad, M. R.; Dhillon, V. S.; Littlefair, S. P.; Wells, M.;
Bannister, N. P.; Hurkett, C. P.; Martindale, A.;
2006MNRAS.373.1416B
VLT/FORS spectroscopy of faint cataclysmic variables discovered by the Sloan Digital Sky Survey
Southworth, John; Gänsicke, B. T.; Marsh, T. R.; de Martino, D.; Hakala, P.; Littlefair, S.; Rodríguez-Gil,
P.; Szkody, P.
2006MNRAS.373..687S
XMM-Newton Observations of Three Interesting Cataclysmic Variables
O'Donoghue, D.; Buckley, D. A. H.; Balona, L. A.; Bester, D.; Botha, L.; Brink, J.; Carter, D. B.; Charles,
P. A.; Christians, A.; Ebrahim, F.;
2006MNRAS.372..151O
ULTRACAM observations of SDSS J170213.26 + 322954.1 - an eclipsing cataclysmic variable in the period gap
Littlefair, S. P.; Dhillon, V. S.; Marsh, T. R.; Gänsicke, B. T.
2006MNRAS.371.1435L
Photometric and polarimetric observations of the eclipsing polar SDSS J205017.84-053626.8
Potter, Stephen B.; O'Donoghue, Darragh; Romero-Colmenero, Encarni; Buckley, David A. H.; Woudt, Patrick A.;
Warner, Brian
2006MNRAS.371..727P
Measurement of the orbital and superhump periods of the eclipsing cataclysmic variable SDSS J170213.26+322954.1
Boyd, David; Oksanen, Arto; Henden, Arne
2006JBAA..116..187B
New pulsating white dwarfs in cataclysmic variables
Nilsson, R.; Uthas, H.; Ytre-Eide, M.; Solheim, J.-E.; Warner, B.
2006MNRAS.370L..56N
FUSE Observations of Magnetic CVs
Szkody, P.; Hoard, D. W.; Linnell, A. P.; Schmidt, G. D.; Ferrario, L.; Sion, E. M.
2006ASPC..348..275S
Modeling The Hot Components In Cataclysmic Variables: Info On The White Dwarf And Hot Disk From GALEX, FUSE,
HST And SDSS
Szkody, Paula
2006AAS...208.3801S
Time-resolved observations of the short period CV SDSS J123813.73-033933.0
Zharikov, S. V.; Tovmassian, G. H.; Napiwotzki, R.; Michel, R.; Neustroev, V.
2006A&A...449..645Z
Optical Outbursts from SDSS J113551.09+532246.2 and SDSS J120231 +450349
Quimby, R.; Mondol, P.
2006ATel..787....1Q
The 2003/2004 Superoutburst of SDSS J013701.06-091234.9
Imada, Akira; Kato, Taichi; Kubota, Kaori; Uemura, Makoto; Ishioka, Ryoko; Kiyota, Seiichiro; Kinugasa, Kenzo;
Maehara, Hiroyuki; Nakajima, Kazuhiro; Monard, L. A. G. Berto
2006PASJ...58..143I
Cataclysmic Variables from Sloan Digital Sky Survey. V. The Fifth Year (2004)
Szkody, Paula; Henden, Arne; Agüeros, Marcel; Anderson, Scott F.; Bochanski, John J.; Knapp, Gillian R.; Mannikko,
Lee; Mukadam, Anjum; Silvestri, Nicole M.; Schmidt, Gary D
2006AJ....131..973S
Elucidating the nature of new Sloan Digital Sky Survey "CVS" with XMM-Newton
Homer, Lee; Szkody, Paula; Chen, Bing; Henden, Arne; Schmidt, Gary D.; Anderson, Scott F.; Silvestri, Nicole
M.; Brinkmann, J.
2006xru..conf..269H
A ZZCeti white dwarf in SDSSJ133941.11+484727.5
Gänsicke, B. T.; Rodríguez-Gil, P.; Marsh, T. R.; de Martino, D.; Nestoras, J.; Szkody, P.; Aungwerojwit,
A.; Barros, S. C. C.; Dillon, M.; Araujo-Betancor, S
2006MNRAS.365..969G
Outburst of CV SDSSp J161332-000331 and Vir4/1432-0033
Yuan, F.; Rykoff, E. S.; the ROTSE Collaboration
2006ATel..694....1Y
XMM-Newton and Optical Follow-up Observations of SDSS J093249.57+472523.0 and SDSS J102347.67+003841.2
Homer, Lee; Szkody, Paula; Chen, Bing; Henden, Arne; Schmidt, Gary; Anderson, Scott F.; Silvestri, Nicole
M.; Brinkmann, J.
2006AJ....131..562H
Using XMM-Newton and Optical Photometry to Figure Out CVs
Szkody, P.; Homer, L.; Henden, A.
2006JAVSO.tmp...46S
Characterizing three candidate magnetic cataclysmic variables from SDSS: XMM-Newton and optical follow-up
observations.
Homer, L.; Szkody, P.; Henden, A.; Chen, B.; Schmidt, G. D.; Fraser, O. J.; West, A. A.
2006AJ....132.2743H
SDSS papers on astro-ph in reverse chronological order:
An Illustration of Modeling Cataclysmic Variables: HST, FUSE, SDSS Spectra of SDSSJ080908.39+381406.2
A. Linnel et al
Astrophys.J. 654 (2007) 1036
http://au.arxiv.org/abs/astro-ph/0612692
VLT/FORS spectroscopy of faint cataclysmic variables discovered by the Sloan Digital Sky Survey
J. Southworth et al
Mon.Not.Roy.Astron.Soc. 373 (2006) 687-699
http://xxx.lanl.gov/abs/astro-ph/0609196
Characterizing Three Candidate Magnetic CVs from SDSS: XMM-Newton and Optical Follow-up Observations
L. Homer et al
12 pages, 9 figures, accepted for publication in the Astronomical Journal
http://au.arxiv.org/abs/astro-ph/0609462
ULTRACAM observations of SDSS J170213.26+322954.1 - an eclipsing cataclysmic variable in the period gap
S. P. Littlefair et al
Mon.Not.Roy.Astron.Soc. 371 (2006) 1435-1440
http://au.arxiv.org/abs/astro-ph/0607056
Measurement of the orbital and superhump periods of the eclipsing cataclysmic variable SDSS J170213.26+322954.1
D. Boyd, A. Oksanen, A. Henden
J.Br.Astron.Assoc. 116 (2006) 187-189
http://au.arxiv.org/abs/astro-ph/0601712
Time-resolved observations of the short period CV SDSS J123813.73-033933.0
S.V. Zharikov et al
9 pages, 7 figures, accepted to A&A
http://au.arxiv.org/abs/astro-ph/0512141
The 2003/2004 superoutburst of SDSS J013701.06-091234.9
A Imada et al
11 pages, 6 figures, 4 tables. Accepted for PASJ
http://au.arxiv.org/abs/astro-ph/0510764
A ZZ Ceti white dwarf in SDSS J133941.11+484727.5
B Gaensicke et al
Mon.Not.Roy.Astron.Soc. 365 (2006) 969-976
http://au.arxiv.org/abs/astro-ph/0510712
SDSS J210014.12+004446.0: A New Dwarf Nova with Quiescent Superhumps?
J. Tramposch et al
6 pages, 5 eps figures, accepted by PASP Dec. 16th, 2004
http://au.arxiv.org/abs/astro-ph/0501178
A photometric study of the newly discovered eclipsing cataclysmic variable SDSS J040714.78-064425.1
T. Ak et al
6 pages, 8 figures. accepted by PASA
http://au.arxiv.org/abs/astro-ph/0412637
High Speed Photometry of SDSS J013701.06-091234.9
M. L. Pretorious et al
Mon.Not.Roy.Astron.Soc. 352 (2004) 1056
http://au.arxiv.org/abs/astro-ph/0405202
High speed photometry of faint Cataclysmic Variables: IV. V356 Aql, Aqr1, FIRST J1023+0038, Ha 0242-2802,
GI Mon, AO Oct, V972 Oph, SDSS 0155+00, SDSS 0233+00, SDSS 1240-01, SDSS 1556-00, SDSS 2050-05, FH Ser
P. Wouldt, B. Warner, M. L. Pretorious
Mon.Not.Roy.Astron.Soc. 351 (2004) 1015
http://au.arxiv.org/abs/astro-ph/0403435
SDSS J161033.64-010223.3: A second Cataclysmic Variable with a Non-radially Pulsating Primary
P. Wouldt, B. Warner
Mon.Not.Roy.Astron.Soc. 348 (2004) 599
http://au.arxiv.org/abs/astro-ph/0311088
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