J/MNRAS/441/1186 Cataclysmic variables from CRTS (Drake+, 2014)
Cataclysmic variables from the Catalina Real-time Transient Survey.
Drake A.J., Gansicke B.T., Djorgovski S.G., Wils P., Mahabal A.A.,
Graham M.J., Yang T.-C., Williams R., Catelan M., Prieto J.L., Donalek C.,
Larson S., Christensen E.
<Mon. Not. R. Astron. Soc., 441, 1186-1200 (2014)>
=2014MNRAS.441.1186D 2014MNRAS.441.1186D
ADC_Keywords: Binaries, cataclysmic ; Magnitudes
Keywords: stars: distances - stars: dwarf novae - novae, cataclysmic variables -
galaxies: stellar content
Abstract:
We present 855 cataclysmic variable candidates detected by the
Catalina Real-time Transient Survey (CRTS) of which at least 137 have
been spectroscopically confirmed and 705 are new discoveries. The
sources were identified from the analysis of five years of data, and
come from an area covering three quarters of the sky. We study the
amplitude distribution of the dwarf novae cataclysmic variables (CVs)
discovered by CRTS during outburst, and find that in quiescence they
are typically 2mag fainter compared to the spectroscopic CV sample
identified by the Sloan Digital Sky Survey. However, almost all CRTS
CVs in the SDSS footprint have ugriz photometry. We analyse the
spatial distribution of the CVs and find evidence that many of the
systems lie at scale heights beyond those expected for a Galactic thin
disc population. We compare the outburst rates of newly discovered
CRTS CVs with the previously known CV population, and find no evidence
for a difference between them. However, we find significant evidence
for a systematic difference in orbital period distribution. We discuss
the CVs found below the orbital period minimum and argue that many
more are yet to be identified among the full CRTS CV sample. We
cross-match the CVs with archival X-ray catalogues and find that most
of the systems are dwarf novae rather than magnetic CVs.
Description:
The Catalina Sky Survey began in 2004 and uses three telescopes to
repeatedly survey the sky between declination DE=-75 and +65° in
search of Near-Earth Objects (NEOs) and Potential Hazardous Asteroids
(PHAs). In addition to asteroids, all the Catalina data are analysed
for transient sources by CRTS (Drake et al. 2009ApJ...696..870D 2009ApJ...696..870D, Cat.
J/ApJ/696/870; Djorgovski et al 2011, The First Year of MAXI:
Monitoring Variable X-ray Sources. Mihara T., Kawai N., editors.
Tokyo: JAXA).
Observations are taken during the darkest 21 nights per lunation in
sets of four images each separated by 10-min. Exposures typically
last for 30s. All images are taken unfiltered to maximize
throughput. Photometry is carried out using the aperture photometry
program SExtractor (Bertin & Arnouts, 1996A&AS..117..393B 1996A&AS..117..393B) and is
transformed to V using standard stars as noted by Drake et al.
(2013ApJ...763...32D 2013ApJ...763...32D, Cat. J/ApJ/763/32).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 100 855 CRTS cataclysmic variables
table3.dat 75 22 ROSAT matches to CRTS CVs
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See also:
J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
J/AJ/134/185 : Cataclysmic variables from SDSS-DR5 (Szkody+, 2007)
J/AJ/142/181 : CVs from SDSS. VIII. The final year (Szkody+, 2011)
J/MNRAS/421/2414 : Faint cataclysmic variables from SDSS (Woudt+, 2012)
J/AJ/144/81 : CV candidates spectroscopy & photometry (Thorstensen+, 2012)
J/ApJ/763/32 : Galactic halo RRab stars from CSS (Drake+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- --- [CRTS_]
6- 21 A16 --- CRTS CRTS designation (JHHMMSS.s+DDMMSS)
23- 24 I2 h RAh Right ascension (J2000)
26- 27 I2 min RAm Right ascension (J2000)
29- 33 F5.2 s RAs Right ascension (J2000)
35 A1 --- DE- Declination sign (J2000)
36- 37 I2 deg DEd Declination (J2000)
39- 40 I2 arcmin DEm Declination (J2000)
42- 45 F4.1 arcsec DEs Declination (J2000)
47- 50 F4.1 mag Vmax [11/21.6]?=0 Observed peak V magnitude
52 A1 --- l_Vmin Limit flag on VmagQ
53- 56 F4.1 mag Vmin ? CRTS quiescent magnitude or limit (if known)
58- 61 I4 --- Ndet [0/17] Number of outbursts detected by CRTS
64- 92 A29 --- Det Detection ID from CRTS or other prior
IDs when previously known
94-100 A7 --- Ref References (1)
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Note (1): Reference for spectroscopic follow-up as follows:
I = Szkody et al. (2002AJ....123..430S 2002AJ....123..430S, 2003AJ....126.1499S 2003AJ....126.1499S,
2004AJ....128.1882S 2004AJ....128.1882S, 2005AJ....129.2386S 2005AJ....129.2386S, 2006AJ....131..973S 2006AJ....131..973S,
2007AJ....134..185S 2007AJ....134..185S, 2009AJ....137.4011S 2009AJ....137.4011S, 2011AJ....142..181S 2011AJ....142..181S)
II = Thorstensen and Skinner (2012AJ....144...81T 2012AJ....144...81T, Cat. J/AJ/144/81)
III = This work
IV = Quimby et al. (2008ATel.1750....1Q 2008ATel.1750....1Q)
V = Levitan et al. (2013MNRAS.430..996L 2013MNRAS.430..996L)
VI = Garnavich et al. (2012ATel.4112....1G 2012ATel.4112....1G)
VII = Breedt et al. (2012MNRAS.425.2548B 2012MNRAS.425.2548B)
VIII = Woudt et al. (2012MNRAS.421.2414W 2012MNRAS.421.2414W, Cat. J/MNRAS/421/2414)
IX = Wright et al. (2012ATel.4516....1W 2012ATel.4516....1W)
X = Wils et al. (2010MNRAS.402..436W 2010MNRAS.402..436W)
XI = Croom et al. (2001MNRAS.322L..29C 2001MNRAS.322L..29C, Cat. VII/223)
XII = Jones et al. (2004MNRAS.355..747J 2004MNRAS.355..747J)
XIII = Drake et al. (2009ApJ...696..870D 2009ApJ...696..870D, Cat. J/ApJ/696/870)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [CRTS_]
6- 21 A16 --- CRTS CRTS designation (JHHMMSS.s+DDMMSSs)
23- 27 F5.2 --- HR1 [-1/1] ROSAT X-ray hardness ratio HR1
29- 32 F4.2 --- e_HR1 rms uncertainty on HR1
34- 38 F5.2 --- HR2 [-1/1] ROSAT X-ray hardness ratio HR2
40- 43 F4.2 --- e_HR2 rms uncertainty on HR2
45- 48 F4.1 arcsec Offset [0/38] Offset between the CRTS and ROSAT sources
50- 53 F4.2 --- Nsig [0/2] Offset in terms of ROSAT position error
55- 58 A4 --- --- ---
59- 74 A16 --- 1RXS ROSAT identifier (JHHMMSS.s+DDMMSS)
75 A1 --- n_1RXS [*] * for objects identified as X-ray matches
in CRTS alerts
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History:
* 20-May-2015: From electronic version of the journal
* 27-Jul-2016: 2 names corrected in table1
(End) Patricia Vannier [CDS] 05-Feb-2015