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J/PASP/118/1238     Radial velocity curve of RBS 490        (Thorstensen+, 2006)

The unusual cataclysmic binary star RBS 0490 and the space density of cataclysmic variables. Thorstensen J.R., Lepine S., Shara M. <Publ. Astron. Soc. Pac., 118, 1238-1244 (2006)> =2006PASP..118.1238T
ADC_Keywords: Stars, variable ; Radial velocities ; Photometry, UBVRI ; Proper motions Abstract: RBS (ROSAT Bright Source) 0490 is a cataclysmic variable star (CV) with unusually strong emission lines. The strength of the emission lines has led to a suggestion that the object is intrinsically faint and correspondingly nearby (33pc), which, if true, would strongly affect estimates of the CV space density. Here we report astrometry, filter photometry, and time-series spectroscopy of this object. The astrometry gives an absolute parallax of 4.5±1.5mas and a relative proper motion of 102mas/yr. A Bayesian procedure gives a very uncertain distance estimate of d∼300pc, and the small parallax alone implies d>133pc (at 2 standard deviations). The mean V magnitude is 17.4, which implies MV=10.9-5log[d/(200pc)], neglecting extinction. At 200pc, the space velocity would be over 90km/s with respect to the local standard of rest. The time-series spectroscopy shows a possible emission-line radial velocity period near 46 minutes. This would be unusually short for an orbital period, and it may represent some other clock in the system. Description: All our data are from the 2.4m Hiltner reflector at MDM Observatory on Kitt Peak, Arizona. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 03 54 10.33 -16 52 49.2 RBS 490 = 1RXS J035410.4-165244 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 67 21 *Filter photometry (for 20 stars) table4.dat 16 105 Radial Velocities for RBS 490 ([TLS2006] J035410.31-165250.3) table6.dat 69 44 *Astrometric parameters for all the stars measured in the field
Note on table2.dat and table6.dat: Stars identified as [TLS2006] in Simbad
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 A1 --- Sample [FV] Field stars (averages of two observations) or Variable star (two observations separately) 3 I1 h RAh Right ascension (ICRS) (1) 5- 6 I2 min RAm Right ascension (ICRS) (1) 8- 12 F5.2 s RAs Right ascension (ICRS) (1) 14 A1 --- DE- Declination sign (IRCS) (1) 15- 16 I2 deg DEd Declination (IRCS) (1) 18- 19 I2 arcmin DEm Declination (IRCS) (1) 21- 24 F4.1 arcsec DEs Declination (IRCS) (1) 26- 30 F5.2 mag U-B ?=- U-B colour index 32- 35 F4.2 mag e_U-B ? rms uncertainty on U-B (2) 37- 41 F5.2 mag B-V B-V colour index 43- 46 F4.2 mag e_B-V rms uncertainty on B-V (2) 48- 52 F5.2 mag Vmag V magnitude 54- 57 F4.2 mag e_Vmag rms uncertainty on Vmag (2) 59- 62 F4.2 mag V-I V-I colour index 64- 67 F4.2 mag e_V-I rms uncertainty on V-I (2)
Note (1): Coordinates referred to the ICRS and are from a fit to 24 USNOA2.0 stars, with a scatter of 0.6". Note (2): Uncertainties greater than 0.01mag are derived from counting statistics. Counting statistics errors less than 0.005mag have been rounded up to 0.01mag; systematic errors are expected to be several times larger than this in any case
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian Date of mid-exposure 14- 16 I3 km/s RVemm Average velocity of Hβ, HeI 5876, and HeI 6678
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1 A1 --- Star [*] * for program star (RBS 490) 2 I1 h RAh Right ascension (ICRS, J2000) 4- 5 I2 min RAm Right ascension (ICRS, J2000) 7- 11 F5.2 s RAs Right ascension (ICRS, J2000) 13 A1 --- DE- Declination sign (IRCS, J2000) 14- 15 I2 deg DEd Declination (IRCS, J2000) 17- 18 I2 arcmin DEm Declination (IRCS, J2000) 20- 23 F4.1 arcsec DEs Declination (IRCS, J2000) 25 I1 --- Weight [0/1] Weight, 1 or 0, depending on whether the star is used as reference 27- 29 I3 mag sigma rms deviation from the relative positions predicted by the best-fit parallax and proper motion 31- 35 F5.2 mag Vmag V magnitude 37- 40 F4.2 mag V-I V-I colour index 42- 46 F5.1 mag plx Relative parallax 48- 51 F4.1 mag e_plx rms uncertainty on plx 53- 57 F5.1 mas/yr pmX Proper motion along X (1) 59- 64 F6.1 mas/yr pmY Proper motion along Y (1) 66- 69 F4.1 mas/yr e_pmX rms uncertainty on pmX and pmY
Note (1): Proper motions are relative to the set of reference stars used and are not on an inertial system.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Jan-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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