J/AJ/136/2107 Distances of cataclysmic variables (Thorstensen+, 2008)
Parallax and distance estimates for twelve cataclysmic variable stars.
Thorstensen J.R., Lepine S., Shara M.
<Astron. J., 136, 2107-2114 (2008)>
=2008AJ....136.2107T 2008AJ....136.2107T
ADC_Keywords: Stars, variable; Parallaxes, trigonometric; Stars, distances
Keywords: astrometry - novae, cataclysmic variables - stars: distances -
stars: dwarf novae - stars: individual (HT Cas, KT Per, IR Gem,
DW Cnc, VV Pup, SW UMa, BZ UMa, AR UMa, V396 Hya, QS Vir, MR Ser,
MQ Dra)
Abstract:
We report parallax and distance estimates for 12 more cataclysmic
binaries and related objects observed with the 2.4m Hiltner telescope
at MDM Observatory. The final parallax accuracy is typically ∼1mas.
Description:
All the images are from the 2.4m Hiltner telescope at the MDM
Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 82 985 Positions, magnitudes, parallaxes, and proper
motions of 12 cataclysmic binaries and related
objects
table3.dat 113 12 Parallaxes, proper motions, and distances
of 12 cataclysmic binaries (program stars)
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See also:
J/AJ/126/3017 : Distances of cataclysmic variables (Thorstensen, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Field Source field name
10 A1 --- Flag [*] Indicates object is program star
11- 12 I2 h RAh Hour of Right Ascension (J2000) (1)
14- 15 I2 min RAm Minute of Right Ascension (J2000) (1)
17- 21 F5.2 s RAs Second of Right Ascension (J2000) (1)
23 A1 --- DE- Sign of Declination (J2000) (1)
24- 25 I2 deg DEd Degree of Declination (J2000) (1)
27- 28 I2 arcmin DEm Arcminute of Declination (J2000) (1)
30- 33 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1)
35 I1 --- W [0/1] Weight (1 = used as a reference star)
37- 39 I3 mas sigma Scatter around best astrometric fit;
see text (2)
41- 45 F5.2 mag Vmag The V band magnitude (3)
47- 50 F4.2 mag V-I The (V-I) color index (3)
52- 56 F5.1 mas plx Fitted parallax
58- 62 F5.1 mas e_plx Error in plx
64- 69 F6.1 mas/yr pmX Relative proper motion along RA
71- 76 F6.1 mas/yr pmY Relative proper motion along Dec
78- 82 F5.1 mas/yr e_pm Uncertainty in proper motion per coordinate
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Note (1): The celestial coordinates are from mean CCD images and are
referred to USNO A2.0 or UCAC2, which are aligned with the ICRS.
Epochs of the images used are typically around 2005. Coordinates
should be accurate to ∼0.3" external and somewhat better than this
internally.
Note (2): Very large scatter indicates some kind of problem with the
centering of that particular star (caused, for example, by saturation
on some images).
Note (3): With typical external uncertainties of 0.05mag.
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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- 8 A8 --- Star Star name
10- 13 F4.1 mas plx Relative parallax
15- 17 F3.1 mas e_plx rms uncertainty on plx derived from the
goodness of fit
19- 21 F3.1 mas E_plx ? rms uncertainty on plx derived from the
scatter of the reference stars
23- 26 F4.1 mag PLX Absolute parallax
28- 30 F3.1 mag e_PLX ? rms uncertainty on PLX
32- 34 F3.1 mag PLX2 ? Second value for absolute parallax
36- 38 I3 pc dLK ? 50th percentile of the distance
probability distribution after the
Lutz-Kelker correction is applied
40- 42 I3 pc d(pp) 50th percentile distance estimate using
parallax and proper motion information,
and a model for the intrinsic CV velocity
distribution
44- 46 I3 pc E_d(pp) Error on d(pi+mu) (upper limit)
48- 50 I3 pc e_d(pp) Error on d(pi+mu) (lower limit)
52- 57 F6.1 mas/yr pmX Proper motion in X (i.e., eastward)
59- 63 F5.1 mas/yr pmY Proper motion in Y (i.e., northward)
65- 67 F3.1 mas/yr e_pm rms uncertainty on pmX and pmY
69- 73 F5.2 mag mag ? Apparent magnitude
74- 77 F4.1 mag MAG ? Assumed absolute magnitude
79- 81 F3.1 mag e_MAG ? 1σ combined uncertainty for
83- 86 F4.2 mag m-M ? Distance modulus estimate
88- 90 F3.1 mag e_m-M ? rms uncertainty on m-M
91 A1 --- n_m-M [a] Photometric distance from spectro (1)
93- 95 I3 pc dPLX Distance implied by the absolute parallax,
with no further corrections applied
97- 99 I3 pc E_dPLX Error on dPLX (upper limit)
101-102 I2 pc e_dPLX Error on dPLX (lower limit)
104-106 I3 pc d 50th percentile Bayesian distance
estimate, including all the prior information
108-110 I3 pc E_d Error on distance (upper limit)
112-113 I2 pc e_d Error on distance (lower limit)
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Note (1): a = The photometric distance constraint for KT Per is from
the spectroscopic parallax of the common-proper-motion companion;
see text for details.
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History:
From electronic version of the journal
References:
Thorstensen, Paper I 2003AJ....126.3017T 2003AJ....126.3017T Cat. J/AJ/126/3017
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 19-May-2011