J/AJ/149/128 Radial velocities of 29 cataclysmic variables (Thorstensen+, 2015)
Spectroscopic orbital periods for 29 cataclysmic variables from the Sloan
Digital Sky Survey.
Thorstensen J.R., Taylor C.J., Peters C.S., Skinner J.N., Southworth J.,
Gansicke B.T.
<Astron. J., 149, 128 (2015)>
=2015AJ....149..128T 2015AJ....149..128T
ADC_Keywords: Binaries, cataclysmic ; Radial velocities
Keywords: stars: general
Abstract:
We report follow-up spectroscopy of 29 cataclysmic variables from the
Sloan Digital Sky Survey (SDSS), 22 of which were discovered by SDSS
and seven of which are previously known systems that were recovered in
SDSS. The periods for 16 of these objects were included in the
tabulation by Gansicke et al. While most of the systems have periods
less than 2hr, only one has a period in the 80-86 minutes "spike"
found by Gansicke et al., and 11 have periods longer than 3hr,
indicating that the present sample is skewed toward longer-period,
higher-luminosity objects. Seven of the objects have spectra
resembling dwarf novae, but have apparently never been observed in
outburst, suggesting that many cataclysmics with relatively low
variability amplitude remain to be discovered. Some of the objects are
notable. SDSS J07568+0858 and SDSS J08129+1911 were previously known
to have deep eclipses; in addition to spectroscopy, we use archival
data from the Catalina Real Time Transient Survey to refine their
periods. We give a parallax-based distance of 195(+54,-39)pc for LV
Cnc (SDSS J09197+0857), which at Porb=81m has the shortest orbital
period in our sample. SDSS J08091+3814 shows both the spectroscopic
phase offset and phase-dependent absorption found in SW Sextantis
stars. The average spectra of SDSS J08055+0720 and SDSS J16191+1351
show contributions from K-type secondaries, and SDSS J080440+0239
shows a contribution from an early M star. We use these to constrain
the distances. SDSS J09459+2922 has characteristics typical of a
magnetic system. SDSS11324+6249 may be a novalike variable, and if so,
its orbital period (99 minutes) is unusually short for that subclass.
Description:
Most of the observations reported here are from the 2.4m Hiltner
telescope at MDM Observatory on Kitt Peak, Arizona, equipped with the
modular spectrograph, a 600line/mm grating, and a 20482 SITe CCD
(the "Echelle" detector). This gave 2.0Å/pixel and a spectral
resolution of ∼3.5Å from 4210 to 7500Å. For some of the later
observations, we used a 10242 SITe CCD ("Templeton"), which had the
same pixel as "Echelle" and scale and similar sensitivity, but less
spectral coverage (4660-6730Å). The projected slit width was
∼1.1arcsec.
Two of the objects, SDSS0812 and SDSS1028 (Leo5), were bright enough
for the McGraw-Hill 1.3m telescope, also at MDM. For this we used the
Mark III spectrograph, the SITe 10242 CCD "Templeton," and a grism
giving 2.2Å/pixel from 4650 to 6980Å, with a spectral resolution
of 4.0Å.
A few of our spectra are from the ISIS Double Beam Spectrograph at the
William Herschel Telescope at La Palma. The instrument configuration,
observation procedure, and reductions were essentially as described by
Southworth et al. (2007MNRAS.382.1145S 2007MNRAS.382.1145S).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 29 List of variables
table2.dat 48 1658 Radial velocities
table3.dat 103 35 Fits to radial velocities
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See also:
B/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2014)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006)
J/AJ/144/81 : Spectroscopy + photometry of CV candidates (Thorstensen+, 2012)
J/AJ/142/181 : CVs from SDSS. VIII. The final year (Szkody+, 2011)
J/AJ/136/2107 : Distances of cataclysmic variables (Thorstensen+, 2008)
J/AJ/134/185 : Cataclysmic variables from SDSS-DR5 (Szkody+, 2007)
J/AJ/126/3017 : Distances of Cataclysmic variables (Thorstensen, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
5- 8 I04 --- Star Abbreviated SDSS name of the star (HHMM, J2000)
10- 27 A18 --- SDSS SDSS star identifier (JHHMMSS.ss+DDMMSS.s) (G1)
29- 37 A9 --- OName Other star name
39 A1 --- n_OName Additional note on star name (1)
41- 42 I2 h RAh Hour of Right Ascension (J2000)
44- 45 I2 min RAm Minute of Right Ascension (J2000)
47- 51 F5.2 s RAs Second of Right Ascension (J2000)
53 A1 --- DE- Sign of the Declination (J2000)
54- 55 I2 deg DEd Degree of Declination (J2000)
57- 58 I2 arcmin DEm Arcminute of Declination (J2000)
60- 63 F4.1 arcsec DEs Arcsecond of Declination (J2000)
65- 69 F5.2 mag gmag SDSS g-band magnitude
71- 74 F4.1 mag Vmag Synthetic V-band magnitude (2)
76- 79 A4 --- Ref Reference for position and gmag (3)
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Note (1): Flag defined as follows:
A = Also known as HS1016+3412 (Aungwerojwit et al., 2006A+A...455..659A 2006A+A...455..659A);
B = As listed in Downes et al. 2001 (cat. V/123).
Note (2): Synthetic V magnitudes are from average spectra.
Note (3): References for coordinates and g magnitudes are defined as follows:
I = Szkody et al. (2002AJ....123..430S 2002AJ....123..430S);
II = Szkody et al. (2003AJ....126.1499S 2003AJ....126.1499S);
III = Szkody et al. (2004AJ....128.1882S 2004AJ....128.1882S);
IV = Szkody et al. (2005AJ....129.2386S 2005AJ....129.2386S);
V = Szkody et al. (2006AJ....131..973S 2006AJ....131..973S);
VI = Szkody et al. 2007 (cat. J/AJ/134/185);
VII = Szkody et al. (2009AJ....137.4011S 2009AJ....137.4011S);
VIII = Szkody et al. 2011 (cat. J/AJ/142/181).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- SDSS SDSS star identifier (HHMMSS.ss+DDMMSS.s, J2000)
20- 31 F12.4 d HJD UTC Heliocentric Julian Date of mid-exposure
33- 36 I4 km/s RVe Radial velocity from emission lines
38- 40 I3 km/s e_RVe Uncertainty in RVe
42- 45 I4 km/s RVa ? Radial velocity from absorption lines
47- 48 I2 km/s e_RVa ? Uncertainty in RVa
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SDSS]
5- 8 I04 --- Star Abbreviated SDSS name of the star (HHMM, J2000)
10- 19 A10 --- f_Star Spectra (absorption, emission, or combined) (1)
21- 38 A18 --- SDSS SDSS star identifier (JHHMMSS.ss+DDMMSS.s) (G1)
40- 49 F10.4 d T0 ? Heliocentric Julian Date T0 (HJD-2400000 (2)
51- 55 F5.4 d e_T0 ]0/0.01]? Uncertainty in T0
57- 65 F9.7 d P [0.05/0.29] Period (2)
67- 69 A3 --- f_P Flag for refined eclipse period (3)
71- 78 F8.7 d e_P ]0/0.002] Uncertainty in P
80- 84 F5.1 km/s K ? The K parameter (semi-amplitude) (2)
86- 88 I3 km/s e_K [3/234]? Uncertainty in K
90- 93 I4 km/s gam ? The γ parameter (systemic velocity) (2)
95- 96 I2 km/s e_gam [2/17]? Uncertainty in γ
98-100 I3 --- N [16/158]? Number of spectra used
102-103 I2 km/s rms [7/61]? The rms residual of the fit (σ)
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Note (1): Sources of observation for SDSS0922 are defined as below:
[WHT] = Spectra from the ISIS Double Beam Spectrograph at the William
Herschel Telescope at La Palma;
[MDM] = Observation from the 2.4m Hiltner telescope at MDM Observatory on
Kitt Peak, Arizona.
Note (2): Parameters of least-squares sinusoid fits to the radial velocities, of
the form: v(t)=γ+Ksin(2π(t-T0)/P).
The epoch T0 is chosen to be near the center of the time interval
covered by the data, and within one cycle of an actual observation
Note (3): Flag defined as follows:
c = The eclipse period, refined from the Catalina Real Time Transient
Survey, Data Release 2 (CRTTS; Drake et al. 2009, cat. J/ApJ/696/870)
data, is 0.1369739(2) days (see Section 3.1 for details);
d = The eclipse period, refined from CRTTS data, is 0.1600525(3) days
(see Section 3.4 for details);
e = The daily cycle count for SDSS1429 is ambiguous (see Section 3.20 for
details).
: = Ambiguous value.
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Global Notes:
Note (G1): SDSS identifiers added at CDS from Table 2.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 23-Apr-2015