Exploratory spectroscopy of magnetic cataclysmic variables candidates and other variable objects. II. (2020)
Keywords :
Cataclysmic variable stars ; Dwarf novae ; Interacting binary stars ; Magnetic variable stars ; AM Herculis stars ; DQ Herculis stars ; Spectroscopy
Abstract:This is the second paper of a series presenting our search for magnetic cataclysmic variables (mCVs) among candidates selected mostly from the Catalina Real-Time Transient Survey. We present the identification spectra, obtained at the SOAR Telescope, as well as magnitudes and Gaia distances for 45 objects. Of these, 39 objects are identified as CVs, from which 8 targets show observational characteristics of mCVs, being 7 polars and 1 intermediate polar. The remaining 31 CVs in our sample are probably non-magnetic systems, in low (22 systems) or high (9 systems) accretion states. Six targets of the sample are not CVs (5 active galactic nuclei and 1 T-Tauri star). Among the 8 objects with mCV spectra, 6 are new classifications. Three
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Objects of this survey were selected by visual inspection of the
Catalina Real-Time Transient Survey (CRTS; Drake+ 2009, J/ApJ/696/870)
light curves of cataclysmic variable candidates, available in their
website (http://crts.caltech.edu/).
All spectra were obtained in remote observing mode using the
Southern Astrophysical Research (SOAR) 4.1m telescope at Cerro Pachon,
Chile, with the Goodman High Throughput Spectrograph on 2018 Jan 14-Apr 17.
The spectrograph was set to yield a spectral resolution of 6{AA} FWHM
in the 4350-8350{AA} spectral range.
- B/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2004)
- II/179 : Southern Spectrophotometric Standards. I + II (Hamuy+, 1992,94)
- II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
- II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
- I/337 : Gaia DR1 (Gaia Collaboration, 2016)
- I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
- I/345 : Gaia DR2 (Gaia Collaboration, 2018)
- V/113 : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2003)
- J/A+A/347/47 : High gal. lat. RASS X-ray sources. II. (Beuermann+, 1999)
- J/other/IBVS/5298 : Harvard variables (Webbink+, 2002)
- J/ApJ/664/53 : UV photometry of GALEX QSO candidates (Atlee+, 2007)
- J/other/NewA/13.133 : 2MASS photometry of cataclysmic variables (Ak+, 2008)
- J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
- J/A+A/506/1341 : Magnetic fields in white dwarfs (Kuelebi+, 2009)
- J/MNRAS/402/436 : New Dwarf novae SDSS, GALEX & astrom. cat. (Wils+, 2010)
- J/ApJS/194/28 : The evolution of cataclysmic variables (Knigge+, 2011)
- J/AJ/142/181 : CVs from SDSS. VIII. The final year (Szkody+, 2011)
- J/A+A/548/A99 : XMM-Newton Slew Survey in 2-10keV (Warwick+, 2012)
- J/MNRAS/421/2414 : Faint cataclysmic variables from SDSS (Woudt+, 2012)
- J/MNRAS/443/3174 : 72 faint CV candidates in CRTS (Breedt+, 2014)
- J/MNRAS/441/1186 : Cataclysmic variables from CRTS (Drake+, 2014)
- J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
- J/MNRAS/456/4441 : Outburst cat. of cataclysmic variables (Coppejans+, 2016)
- J/PASJ/68/65 : Superhumps in SU UMa-type dwarf novae (Kato+, 2016)
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- J/AJ/153/144 : Magnetic CVs spectra & variable objects (Oliveira+, 2017)
- J/AJ/159/43 : Spectro. identified CVs from LAMOST survey.I. (Hou+,2020)
- http://crts.caltech.edu/ : Catalina Real-Time Transient Survey (CRTS) home page
