J/PASJ/64/63 Dwarf novae characterization using SDSS colors (Kato+, 2012)
Characterization of dwarf novae using SDSS colors.
Kato T., Maehara H., Uemura M.
<Publ. Astron. Soc. Jap., 64, 63 (2012)>
=2012PASJ...64...63K 2012PASJ...64...63K
ADC_Keywords: Novae ; Photometry, SDSS
Keywords: methods: statistical - stars: dwarf novae - stars: evolution -
stars: novae, cataclysmic variables - surveys
Abstract:
We have developed a method for estimating the orbital periods of dwarf
novae from the Sloan Digital Sky Survey (SDSS) colors in quiescence
using an artificial neural network. For typical objects below the
period gap with sufficient photometric accuracy, we were able to
estimate the orbital periods with accuracy to a 1σ error of
22%. The error of the estimation is worse for systems with longer
orbital periods. We have also developed a neural-network-based method
for categorical classification. This method has proven to be efficient
in classifying objects into three categories (WZ Sge type, SU UMa
type, and SS Cyg/Z Cam type), and works for very faint objects to a
limit of g=21mag. Using this method, we have investigated the
distribution of the orbital periods of dwarf novae from a modern
transient survey (Catalina Real-Time Survey).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 45 41 Averaged Porb estimates for objects with more
SDSS scans than four
table3.dat 114 1236 List of dwarf novae
table4.dat 98 1236 Estimated extinction and neural-network
classification
table5.dat 41 123 Catalina Real-Time Survey (CRTS) sources for the
estimation of the intrinsic Porb distribution
table7.dat 92 243 Identification list of optical transients
--------------------------------------------------------------------------------
See also:
http://nesssi.cacr.caltech.edu/catalina/ : Catalina Real-Time Survey (CRTS)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 25 A25 --- Name Object name
26 A1 --- n_Name [+] Note on Name (G1)
28- 29 I2 --- N Number of SDSS scans
31- 35 F5.3 d Pest Average orbital period (Porb) estimate
36 A1 --- --- [(]
37- 38 I2 10-3d sdPest Standard deviation of estimated Porb
39 A1 --- --- [)]
41- 45 F5.3 d e_Pest Mean error of neutral network analysis on Pest
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 26 A26 --- Name Object name
27 A1 --- n_Name [+] Note on Name (G1)
29- 34 F6.3 mag umag SDSS u magnitude
36- 40 F5.3 mag e_umag rms uncertainty on umag
43- 48 F6.3 mag gmag ?=- SDSS g magnitude
50- 53 F4.3 mag e_gmag ? rms uncertainty on gmag
56- 61 F6.3 mag rmag ?=- SDSS r magnitude
63- 66 F4.3 mag e_rmag ? rms uncertainty on rmag
69- 74 F6.3 mag imag ?=- SDSS i magnitude
76- 80 F5.3 mag e_imag ? rms uncertainty on imag
83- 88 F6.3 mag zmag SDSS z magnitude
90- 94 F5.3 mag e_zmag rms uncertainty on zmag
97-102 F6.4 d Porb ?=- Orbital period
103 A1 --- n_Porb [h] h = Determined from superhump period
105-109 F5.3 d Pest ?=- Orbital period estimated with neural network
111-114 F4.3 d e_Pest ? rms uncertainty on Pest
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 26 A26 --- Name Object name
27 A1 --- n_Name [+] Note on Name (G1)
29- 34 F6.3 mag gmag ?=- SDSS g magnitude
36- 39 F4.3 mag e_gmag ? rms uncertainty on gmag
42- 46 I5 pc Dist Distance
48 I1 --- n_Dist [1/6] Distance estimation method (2)
50- 54 F5.3 mag AV Absorption in V band
56- 61 F6.4 d Porb ?=- Orbital period
62 A1 --- n_Porb [h] h: determined from superhump period
64- 68 F5.3 --- PU [0/1]?=- Probability of being of WZ Sge type
(ultrashort period Porb<0.06d)
70- 73 F4.3 --- e_PU [0/1]? rms uncertainty on PU
76- 80 F5.3 --- PS [0/1]?=- Probability of being of SU UMa type
(short period, 0.06≤Porb<0.10d)
82- 86 F5.3 --- e_PS [0/1]? rms uncertainty on PS
89- 93 F5.3 --- PL [0/1]?=- Probability of being of SS Cyg type
(long period, Porb≥0.10d)
95- 98 F4.3 --- e_PL [0/1]? rms uncertainty PL
--------------------------------------------------------------------------------
Note (2): Method of distance estimation as follows:
1 = from Patterson (2011MNRAS.411.2695P 2011MNRAS.411.2695P) and other references (see text)
2 = determined from Porb and maximum magnitude
3 = from estimated Porb and maximum magnitude
4 = from Porb and minimum magnitude
5 = from estimated Porb and minimum magnitude
6 = assuming maximum MV≃4.95
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 F5.1 min Pest Estimated period
7 A1 --- f_Pest [~] Limit flag on e_Pest
8- 11 F4.1 min e_Pest rms uncertainty on Pest
13- 14 I2 --- N Number of outbursts recorded by CRTS
(Catalina Real-Time Survey)
15 A1 --- u_N Uncertainty flag on N
18- 41 A24 --- Name Object name
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Name Object name
21- 43 A23 --- ID Identification name
45- 92 A48 --- Disc Discoverer
--------------------------------------------------------------------------------
Global notes:
Note (G1): + : Dwarf nova proposed by Wils et al., 2010MNRAS.402..436W 2010MNRAS.402..436W.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 19-Sep-2012