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Radio star catalogue observed in San Juan (RSSJ95)
Using the data observed in San Juan with the photoelectric AstrolabeMark II of the Beijing Astronomical Observatory from February, 1992 toMarch, 1997, the radio star catalogue in San Juan(RSSJ95) has beencompiled. There are 69 radio stars in this catalogue. The positions ofthe radio stars are for the epoch of observation and the equinox J2000.0and a system close to that of the system FK5. The mean precisions are+/-2.2 ms and +/-0.035'' in right ascensions and declinations,respectively. The magnitudes of stars are from 0.9 to 10.7. Thedeclinations are from -2fdg 5 to -60(deg) . The mean epoch is 1995.1.Finally, the comparison results between the Hipparcos catalogue andRSSJ95 are given.
| The Baade-Wesselink method and the distances to RR Lyrae stars. II - The field star X ARIETIS
VR and JHK photometry and radial velocities with typical accuracies of 1km/sec for the metal-poor RR Lyrae field star X Arietis. These data,along with unpublished UVBY photometry, have been used to derive thedistance to X Ari using two variations of the Baade-Wesselink method.The possibility of photospheric velocity gradients that might distortthe value of the systemic velocity and cause a phase shift was examined,and it was found that no gradient exists in the part of the stellaratmosphere considered. The phasing problem previously noted for VY Serby Carney and Latham (1984) also occurs for X Ari when opticalphotometry is used to compute the effective temperatures, but not whenthe V - K color index is used. Possible causes of these phase shifts arediscussed, and it is concluded that X Ari has an aggregate average Vmagnitude of 0.73-1.03 mag on the basis of the V - K results.
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | לויתן |
| התרוממות ימנית: | 03h07m49.96s |
| סירוב: | +09°55'22.8" |
| גודל גלוי: | 7.913 |
| תנועה נכונה: | 10.5 |
| תנועה נכונה: | 3.2 |
| B-T magnitude: | 8.257 |
| V-T magnitude: | 7.942 |
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