J/AJ/159/114 Magnetic CVs spectra & other variable objects II. (Oliveira+, 2020)
Exploratory spectroscopy of magnetic cataclysmic variables candidates and other
variable objects.
II.
Oliveira A.S., Rodrigues C.V., Martins M., Palhares M.S., Silva K.M.G.,
Lima I.J., Jablonski F.J.
<Astron. J., 159, 114 (2020)>
=2020AJ....159..114O 2020AJ....159..114O
ADC_Keywords: Stars, variable; Binaries, cataclysmic; Spectra, optical;
Equivalent widths; Stars, distances; Photometry, VRI
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
polars were observed in low-accretion state, either revealing
photospheric features of the secondary star and allowing the
estimation of their spectral type, or presenting Hβ Zeeman
components associated to the white dwarf (WD) magnetic field. In
addition to the results obtained in the first paper of the series, and
depending on the confirmation of these classifications by
observational follow-up, our results would increase the sample of
known polars by about 9%.
Description:
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 6Å FWHM
in the 4350-8350Å spectral range.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 100 46 List of observed targets
table2.dat 54 39 Equivalent Width (EW) and Full Width at Half
Maximum (FWHM) of HeII4686Å, Hβ and Hα
emission lines of the objects classified as CVs
fits/* . 46 *Individual spectra in FITS format
(data behind Figure 1)
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Note on fits/* : Each spectrum is the average of three consecutive spectra, in
order to remove cosmic rays. Telluric absorption features are visible
in the spectra at 6870, 7180 and 7630Å.
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See also:
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)
J/AJ/154/252 : A VLA survey of magnetic CVs. I. The data (Barrett+,2017)
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
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Object name
25- 34 A10 --- OName Abbreviated name used in manuscript
and for the file name in subdirectory "fits"
36- 37 I2 h RAh [3/21] Hour of Right Ascension (J2000)
39- 40 I2 min RAm Minute of Right Ascension (J2000)
42- 43 I2 s RAs Second of Right Ascension (J2000)
45- 45 A1 --- DE- Sign of the Declination (J2000)
46- 47 I2 deg DEd Degree of Declination (J2000)
49- 50 I2 arcmin DEm Arcminute of Declination (J2000)
52- 53 I2 arcsec DEs Arcsecond of Declination (J2000)
55- 58 I4 yr Obs.Y [2018] Observation date
60- 62 A3 "month" Obs.M Observation date
64- 65 I2 d Obs.D Observation date
67- 70 I4 s Exp [180/2700] Observation exposure
72- 73 A2 --- Type Type (G1)
75- 78 F4.1 mag Vmag [13.6/21.8] V band magnitude
80- 83 I4 pc Dist [125/2698]? Heliocentric distance from
Bailer-Jones+, 2018, I/347
85- 88 I4 pc E_Dist [2/2942]? Upper uncertainty on Dist
90- 92 I3 pc e_Dist [2/737]? Lower uncertainty on Dist
94- 94 A1 --- f_Dist [b] Flag on Dist (1)
96-100 F5.2 --- dplx [-1.69/3.2]? Fractional parallax uncertainty
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Note (1): Flag as follows:
b = MLS1050+10, MLS1137+00 and MLS1247-04 have negative parallaxes in the
Gaia DR2, which usually indicates large distances. The values presented
here are for reference only and are incompatible with the extragalactic
classification.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- OName Abbreviated name used in manuscript
and for the file name in subdirectory "fits"
12- 13 I2 0.1nm EWHeII [4/85]? Equivalent width of He II
15- 15 A1 --- f_EWHeII [:p]? Flag on EWHeII (1)
17- 20 I4 km/s FWHMHeII [330/4190]? Full Width at Half Maximum of
He II (2)
22- 22 A1 --- f_FWHMHeII [p]? Flag on FWHMHeII (1)
24- 26 I3 0.1nm EWHb [-10/270]? Equivalent width of Hβ
28- 28 A1 --- f_EWHb [:p]? Flag on EWHb (1)
30- 33 I4 km/s FWHMHb [500/2740]? Full Width at Half Maximum of
Hβ (2)
35- 35 A1 --- f_FWHMHb [:p]? Flag on FWHMHb (1)
37- 39 I3 0.1nm EWHa [-5/318]? Equivalent width of Hα
41- 44 I4 km/s FWHMHa [400/1960]? Full Width at Half Maximum of
Hα (2)
46- 49 F4.2 --- HeII/Hb [0.05/4]? Line Ratio, HeII/Hβ
51- 51 A1 --- f_HeII/Hb [:]? Flag on HeII/Hβ (1)
53- 54 A2 --- Type Type (G1)
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Note (1): Flags as follows:
p = The line is present in the spectrum but its S/N is low and no
measurements were possible
: = Uncertain values
Note (2): FWHM were measured from Voigt profile fitting.
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Global notes:
Note (G1): Type as follows:
P = polar candidate;
IP = intermediate polar candidate;
D = disk-dominated system (mainly dwarf novae in quiescence);
HA = system with high-state accretion disk (usually dwarf novae
in outbursts or nova-like systems);
E = extragalactic source (AGN);
T = T Tauri star.
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History:
From electronic version of the journal
References:
Oliveira et al. Paper I. 2017AJ....153..144O 2017AJ....153..144O Cat. J/AJ/153/144
(End) Preparerd by [AAS], Coralie Fix [CDS], 28-Apr-2020