J/AJ/169/87 Astrometry & kinematics of cataclysmic variables (Canbay+, 2025)
Kinematics of cataclysmic variables in the solar neighborhood in the Gaia era.
Canbay R., AK T., Bilir S., Soydugan F., Eker Z.
<Astron. J., 169, 87 (2025)>
=2025AJ....169...87C 2025AJ....169...87C
ADC_Keywords: Binaries, cataclysmic; Parallaxes, trigonometric; Positional data;
Optical; Proper motions; Space velocities; Stars, variable;
Velocity dispersion
Keywords: Cataclysmic variable stars ; Solar neighborhood ; Stellar kinematics
Abstract:
Using high-precision astrometric data from Gaia DR3 and updated
systemic velocities from the literature, the kinematical properties of
cataclysmic variables (CVs) were investigated. By constraining the
data according to the total space velocity error and Galactic
population class, a reliable sample of data was obtained. Nonmagnetic
CVs located in the thin disk have been found to have a total space
velocity dispersion of σν=46.33±4.23km/s, indicating that
the thin disk CVs with a mean kinematical age of τ=3.95±0.75Gyr
are much younger than the local thin disk of the Galaxy with
τ ∼6-9Gyr. Total space velocity dispersions of nonmagnetic CVs
belonging to the thin disk component of the Galaxy were found to be
σν=47.67±3.94 and σν=44.43±4.33km/s for the
systems below and above the orbital period gap, respectively,
corresponding to kinematical ages of τ=4.19±0.71 and
τ=3.61±0.74Gyr. γ velocity dispersions of the thin disk
CVs below and above the gap were obtained
σγ=27.52±2.28 and σγ=25.65±2.44km/s,
respectively. This study also shows that the orbital period is
decreasing with increasing age, as expected from the standard theory.
The age-orbital period relation for nonmagnetic thin disk CVs was
obtained as dP/dt =-2.09(±0.22)x10-5s/yr. However, a significant
difference could not be found between the γ velocity dispersions
of the systems below and above the gap, which were calculated to be
σγ=27.52±2.28 and σγ=25.65±2.44km/s,
respectively.
Description:
Calculating the spatial velocity components of stars requires the
equatorial (α, δ) and Galactic (l, b) coordinates of the
objects, the proper-motion components (µαcosδ,
µδ), trigonometric parallaxes, and the radial velocities.
The systems classified as a CV with known γ velocities have been
compiled from the literature (see Table 1 for list of references),
while astrometric data were retrieved from the Gaia DR3 (I/355).
Orbital periods were collected from Ritter+2003 (B/cb, V/113),
Downes+2001 (V/123), and other literature.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 185 432 Coordinates, types, orbital periods, astrometric
data, and systemic velocities of CVs
table2.dat 132 432 Galactic coordinates, space velocity components,
and TD/D values for CVs
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See also:
B/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2004)
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)
V/110 : Catalog of Cataclysmic Variables (Downes+ 2001)
V/113D : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2003)
V/123A : Catalog of Cataclysmic Variables (Downes+ 2001-2006)
J/A+A/312/93 : Cataclysmic variables systemic-velocity (van Paradijs+, 1996)
J/A+AS/141/491 : Chemical composition of halo and disk stars (Nissen+, 2000)
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/MNRAS/355/307 : SA114 Ug'r'i'Z photometry (Karaali+, 2004)
J/A+A/433/185 : Detailed abundance analysis of 102 F & G dwarfs (Bensby+, 2005)
J/A+A/440/1153 : Equivalent widths of 7 thin-disk stars (del Peloso+, 2005)
J/other/NewA/12.446 : Absolute magnitudes of cataclysmic variables (Ak+, 2007)
J/A+A/492/171 : VIc light curves of NGC 6791 V20 (Grundahl+, 2008)
J/ApJS/194/28 : The evolution of cataclysmic variables (Knigge+, 2011)
J/AJ/150/170 : Radial velocities of 7 cataclysmic binaries (Halpern+, 2015)
J/other/NewA/34.234 : Gal. cataclysmic variables distances (Ozdonmez+, 2015)
J/AJ/152/226 : Radial velocities of 35 CVs (Thorstensen+, 2016)
J/MNRAS/480/4884 : Gaia wide binaries (El-Badry+, 2018)
J/A+A/620/A141 : Physical properties of AM CVn stars (Ramsay+, 2018)
J/ApJ/886/100 : High-mass white dwarfs in Gaia DR2 (Cheng+, 2019)
J/MNRAS/486/5535 : Parameters of 15 CVs (McAllister+, 2019)
J/MNRAS/491/5717 : Evidenced reduced magnetic braking in polars (Belloni+,2020)
J/A+A/658/A22 : Kinematic properties of white dwarfs (Raddi+, 2022)
J/AJ/165/163 : Cataclysmic variables in the Gaia era (Canbay+, 2023)
J/MNRAS/525/3597 : CVs from SDSS V (Inight+, 2023)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/432] Sequential identifier
(Not consistent with Table 2)
6- 36 A31 --- Name Star Name
38- 39 I2 h RAh Hour of right ascension, Gaia DR3 (I/355)
(J2000)
41- 42 I2 min RAm Minute of right ascension, Gaia DR3 (I/355)
(J2000)
44- 48 F5.2 s RAs Second of right ascension, Gaia DR3 (I/355)
(J2000)
50 A1 --- DE- Sign of the Declination, Gaia DR3 (I/355)
(J2000)
51- 52 I2 deg DEd Degree of declination, Gaia DR3 (I/355)
(J2000)
54- 55 I2 arcmin DEm Arcminute of declination, Gaia DR3 (I/355)
(J2000)
57- 61 F5.2 arcsec DEs Arcsecond of declination, Gaia DR3 (I/355)
(J2000)
63- 69 A7 --- Type Type (1)
71- 78 F8.6 d Porb [0.02/4.7] Oribtal period
80- 86 F7.4 mas plx [0.09/22.4] Trigonometric parallax, Gaia DR3
(I/355)
88- 93 F6.4 mas e_plx [0.0123/1.0658] Uncertainty in plx
95- 99 I5 pc Dist1 [45/10449] Distance from plx, Gaia DR3 (I/355)
101- 105 I5 pc e_Dist1 [0/21274] Uncertainty in Dist1
107- 114 F8.3 mas/yr pmRA [-145.362/137.993] Proper motion in RA, Gaia
DR3 (I/355)
116- 120 F5.3 mas/yr e_pmRA [0.013/1.27] Uncertainty in pmRA
122- 129 F8.3 mas/yr pmDE [-250.455/72.72] Proper motion in DE, Gaia
DR3 (I/355)
131- 135 F5.3 mas/yr e_pmDE [0.013/0.924] Uncertainty in pmDE
137- 140 I4 pc Dist2 [45/5579] Distance (Bailer-Jones+2021, I/352)
142- 145 I4 pc e_Dist2 [0/4322] Uncertainty in Dist2
147- 153 F7.2 km/s gamma [-149.0/177.0] Systemic velocity
155- 159 F5.2 km/s e_gamma [0.01/70.0] Uncertainty in gamma
161- 165 A5 --- r_gamma Reference for gamma
167- 185 A19 --- Bibcode ADS/SciX bibcode for r_gamma
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Note (1): Types, depending on their classification in the catalogs (e.g.,
Ritter+2003, V/113) and their studies in the literature, as follows:
mCV = Magnetic cataclysmic variables (polars and intermediate polars);
66 occurrences
non-mCV = Nonmagnetic cataclysmic variables; 366 occurrences
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/432] Sequential identifier (Not consistent
with Table 1)
6- 36 A31 --- Name Star Name
38- 43 F6.2 deg GLON Galactic longitude
45- 50 F6.2 deg GLAT Galactic latitude
52- 55 I4 pc Dist2 [45/5579] Distance (Bailer-Jones+2021, I/352)
57- 60 I4 pc e_Dist2 [0/4322] Uncertainty in Dist2
62- 66 I5 pc X [-3043/4992] Galactic X coordinate, Sun-centered
68- 72 I5 pc Y [-4469/4305] Galactic Y coordinate, Sun-centered
74- 78 I5 pc Z [-2647/2667] Galactic Z coordinate, Sun-centered
80- 86 F7.2 km/s ULSR [-101.1/265.6] Space velocity component in U,
corrected for the LSR
88- 92 F5.2 km/s e_ULSR [0.01/48.31] Uncertainty in ULSR
94- 100 F7.2 km/s VLSR [-320.1/146.9] Space velocity component in V,
corrected for the LSR
102- 106 F5.2 km/s e_VLSR [0.01/85.7] Uncertainty in VLSR
108- 114 F7.2 km/s WLSR [-123/123.7] Space velocity component in W,
corrected for the LSR
116- 120 F5.2 km/s e_WLSR [0.01/61.9] Uncertainty in WLSR
122- 130 E9.3 --- Prob [5e-3/8.9e+25]? Thick disk / thin disk
probability
132 A1 --- f_Prob Probability flag indicating a Prob value of
4.77e+38 (1)
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Note (1): Probability flag indicating a Prob value of 4.77e+38.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Robin Leichtnam [CDS] 25-Nov-2025