J/MNRAS/502/5668 Superoutburst of 206 SU UMa-type dwarf novae (Vogt+, 2021)
Determination of the superoutburst cycle lengths of 206 SU UMa-type dwarf novae.
Vogt N., Puebla E.C., Contreras-Quijada A.
<Mon. Not. R. Astron. Soc., 502, 5668-5678 (2021)>
=2021MNRAS.502.5668V 2021MNRAS.502.5668V (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, dwarfs ; Novae ; Binaries, cataclysmic ;
Optical
Keywords: stars - cataclysmic variables - stars: dwarf novae
Abstract:
SU UMa stars are characterized by 'superoutbursts', which are brighter
at maximum light and which last much longer than the more frequent
'ordinary' outbursts of these dwarf novae. Although there are now more
than 1180 SU UMa-type dwarf novae catalogued, our knowledge on their
superoutburst cycle length Cso has hitherto been limited to about 6
per cent of the entire sample of known SU UMa stars. Using public data
bases we have determined new Cso values for a total of 206
additional SU UMa stars in the range 17d<Cso<4590d (including some
ER UMa and WZ Sge-type representants) within total time intervals
between 2 and 57yr, and with an estimated uncertainty of ±11 per
cent. This way, we are increasing our present knowledge of Cso
values by a factor of ∼3.8. Their distribution is characterized by a
broad maximum around Cso∼270d, and slowly decreasing numbers up to
Cso∼800d. The domain Cso>450d was unexplored until now; we add
here 106 cases (∼51 per cent of our total sample) in this range of
long cycles, implying a better statistical basis for future studies of
their distribution. Our sample contains 16 known WZ Sge stars, and we
propose WZ Sge membership for five others hitherto classified as
ordinary SU UMa stars. Individual superoutburst timings deviate on
average by about ±7 per cent of the cycle length from their overall
linear ephemeris, confirming the pronounced quasi-periodic
repeatability of superoutbursts. All relevant parameters are listed
with their errors, and a table with individual superoutburst epochs of
our targets is given, enabling future researchers to combine our
results with other (past or future) observations.
Description:
The superoutbursts of most SU UMa stars show a pronounced
quasi-periodicity, occurring rather regularly one linear ephemeris
with a standard deviation of only 5-10 per cent of the corresponding
period (Vogt 1980A&A....88...66V 1980A&A....88...66V). This property allows the
determination of a rough value of the cycle length even if only a few
superoutbursts are recorded. In the present study we are limited to
those dwarf novae for which no reliable cycle length values are
published in the latest online version of the catalogue of Ritter &
Kolb (2003A&A...404..301R 2003A&A...404..301R, Cat. B/cb). The main sources were light
curves determined by AAVSO members available in the LCG data base of
that organization, as well in the photometric All Sky Automated Survey
(ASAS, Pojmanski 2002AcA....52..397P 2002AcA....52..397P, Cat. II/264) catalogue and in
the Catalina Sky Survey (CSS, Drake et al. 2009ApJ...696..870D 2009ApJ...696..870D, Cat.
J/ApJ/696/870). For a few cases this information was complemented from
ASAS-SN (Kochanek et al. 2017PASP..129j4502K 2017PASP..129j4502K) and Gaia alerts (Gaia
Collaboration et al. 2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 77 206 New cycle length values of 206 SU UMa-type
outbursts
table2.dat 50 5 New WZ Sge-type candidate stars
table3.dat 46 280 Data used for our statistical comparison with
published information
table4.dat 23 1310 Cycle count numbers E and epochs Tmax
(JD 2450000) of individual superoutbursts used
for the calculation of the parameters in Table 1
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
B/cb : Cataclysmic Binaries, LMXBs, and related objects
(Ritter+, 2004)
II/264 : ASAS Variable Stars in Southern hemisphere
(Pojmanski+, 2002-2005)
J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Source name
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 21 F4.1 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 31 I2 arcsec DEs Declination (J2000)
33- 34 I2 --- N Number of superoutbursts covered within the
time interval ΔT
36- 40 I5 d DT Time interval ΔT
42- 47 I6 d T0 Epoch (JD-2450000) of the first superoutburst
(1)
49- 53 F5.1 d e_T0 Error on T0
55- 60 F6.1 d Cso Supercycle length (1)
62- 67 F6.2 d e_Cso Error on Cso
69- 73 F5.1 --- O-C Mean standard deviation of the actual
superoutburst epochs from the linear
ephemeris equation (1)
75- 77 A3 --- Remarks Remarks (2)
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Note (1): Values obtained through the linear fit of equation Tmax=T0+CsoE,
where E is the cycle count number
Note (2): Remarks as follows:
WZ = WZ Sge-type star
WZ? = WZ Sge-type candidate
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Source name
12- 23 A12 --- OName Alternative name
25- 30 F6.4 d Porb Orbital period
32- 37 F6.4 d Ps Superhump period
39- 41 F3.1 mag AmpV Outburst amplitude in the V-band
43 I1 --- N Number of superoutbursts covered within the time
interval ΔT
45- 48 I4 d Cso Supercycle length
50 I1 --- Ref ? Reference (1)
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Note (1): Reference as follows:
1 = Still et al. (1994MNRAS.267..957S 1994MNRAS.267..957S)
2 = Howell et al. (1993PASP..105..579H 1993PASP..105..579H)
3 = Kato et al. (2014PASJ...66...90K 2014PASJ...66...90K)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Source name
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 21 F4.1 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 31 I2 arcsec DEs Declination (J2000)
33- 35 I3 d Cn ? Cycle length of normal (short) outburst
37- 42 F6.1 d Cso Cycle lengths of superoutburst
44- 46 A3 --- Ref References (1)
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Note (1): References as follows:
1 = This work, only for Cso
2 = Contreras-Quijada et al. (in preparation), only for Cso
3 = Coppejans et al. (2016MNRAS.456.4441C 2016MNRAS.456.4441C, Cat. J/MNRAS/456/4441), only for
Cn
4 = Ritter & Kolb (2003A&A...404..301R 2003A&A...404..301R, Cat. B/cb, version 7.24, 2017
February), for Cn and/or Cso in the remaining cases
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Source name
12- 14 I3 --- E Cycle count number
16- 23 F8.1 d Tmax Epoch of maximum brightness (JD-2450000)
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 02-Nov-2023