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The K-band spectrum of the cataclysmic variable RXJ 0502.8+1624 (Tau 4)
We present the K-band spectrum of the cataclysmic variable RXJ0502.8+1624 (Tau 4). The spectrum shows a broad, smooth hump, with noabsorption lines from the secondary star visible. This result indicatesthat the infrared light of this system is dominated by cyclotronemission, and, in combination with the optical spectrum and X-rayproperties, suggests that Tau 4 is a polar-type cataclysmic variable(CV). The system was chosen for study because the broadband JHK coloursof Tau 4 are consistent with an L-type dwarf, suggesting that thissystem might harbour an elusive sub-stellar secondary star. The resultpresented here, along with the recent discovery of cyclotron emission inthe cataclysmic variable EF Eri, suggests that care must be taken whenusing the broadband JHK colours of CVs when targeting searches forsub-stellar secondary stars.
| Contemporaneous photometry and radial velocities of RR Lyrae stars
Contemporaneous BVRI photometry and radial velocities of seven RR Lyraevariables covering nearly the full span in Delta S and including the RRcstar T Sex are reported. Over 3000 BVRI measures at 100 s timeresolution and over 400 radial velocity measures are included. Thephotometric uncertainties are of order + or - 0.007 mag in V, (B - V)and (V - R) and + or - 0.014 in (R - I). The radial velocityuncertainties range from + or - 3.8 to + or - 8.0 km/s, correlated withthe metal deficiency. Light, color, and velocity curves are given.
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| A new list of 617 radial velocities in four galactic fields
Four stellar fields in the -30 deg galactic latitude have been surveyedfor radial velocities, using a 62 cm objective prism. Exact positions,spectral types, and approximate magnitudes are provided for 617 stars infour different 4 x 4 deg fields. B to F4 stars were found which haveGaussian velocity distributions.
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Osservazione e dati astrometrici
| Costellazione: | Andromeda |
| Ascensione retta: | 00h25m42.12s |
| Declinazione: | +29°57'49.9" |
| Magnitudine apparente: | 9.09 |
| Moto proprio RA: | -1.7 |
| Moto proprio Dec: | -9 |
| B-T magnitude: | 9.287 |
| V-T magnitude: | 9.107 |
Cataloghi e designazioni:
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