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
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:
FileName Lrecl Records Explanations
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)
See also: J/AJ/126/3017 : Distances of cataclysmic variables (Thorstensen, 2003) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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)
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.
History: From electronic version of the journal References: Thorstensen, Paper I 2003AJ....126.3017T Cat. J/AJ/126/3017
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 19-May-2011
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