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מאמרים קשורים
The Solar Neighborhood. XVIII. Discovery of New Proper-Motion Stars with 0.40" yr-1 > μ >= 0.18" yr-1 between Declinations -90° and -47°
We report 1606 new proper-motion systems in the southern sky(declinations -90° to -47°) with 0.40''yr-1>μ>=0.18'' yr-1. Thiseffort is a continuation of the SuperCOSMOS-RECONS (SCR) proper-motionsearch to lower proper motions than reported in Papers VIII, X, XII, andXV in this series. Distance estimates are presented for the new systems,assuming that all stars are on the main sequence. We find that 31systems are within 25 pc, including two systems (SCR 0838-5855 and SCR1826-6542) that we anticipate to be within 10 pc. These new discoveriesconstitute a more than 10-fold increase in new systems found in the sameregion of sky searched for systems with μ>=0.40''yr-1, suggesting a happy hunting ground for new nearby slowerproper-motion systems in the region just north (declinations -47° to0°), much of which has not been rigorously searched during previousefforts.
| Improved Astrometry and Photometry for the Luyten Catalog. II. Faint Stars and the Revised Catalog
We complete construction of a catalog containing improved astrometry andnew optical/infrared photometry for the vast majority of NLTT starslying in the overlap of regions covered by POSS I and by the secondincremental Two Micron All Sky Survey (2MASS) release, approximately 44%of the sky. The epoch 2000 positions are typically accurate to 130 mas,the proper motions to 5.5 mas yr-1, and the V-J colors to0.25 mag. Relative proper motions of binary components are measured to 3mas yr-1. The false-identification rate is ~1% for11<~V<~18 and substantially less at brighter magnitudes. Theseimprovements permit the construction of a reduced proper-motion diagramthat, for the first time, allows one to classify NLTT stars intomain-sequence (MS) stars, subdwarfs (SDs), and white dwarfs (WDs). We inturn use this diagram to analyze the properties of both our catalog andthe NLTT catalog on which it is based. In sharp contrast to popularbelief, we find that NLTT incompleteness in the plane is almostcompletely concentrated in MS stars, and that SDs and WDs are detectedalmost uniformly over the sky δ>-33deg. Our catalogwill therefore provide a powerful tool to probe these populationsstatistically, as well as to reliably identify individual SDs and WDs.
| The general catalogue of trigonometric [stellar] paralaxes
Not Available
| Trigonometric parallaxes for Southern Hemisphere stars
Ninety-three parallax solutions for 83 Southern Hemisphere stars arepresented which had previously been unpublished, or appeared only in the1952 or 1963 editions of the General Catalogue of Trigonometric StellarParallaxes. These data are now being published in preparation for thenew edition of the Catalogue.
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משמש של הקבוצה הבאה
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | טווס |
| התרוממות ימנית: | 20h29m32.56s |
| סירוב: | -57°57'28.0" |
| גודל גלוי: | 9.367 |
| תנועה נכונה: | 285.4 |
| תנועה נכונה: | -88.7 |
| B-T magnitude: | 10.189 |
| V-T magnitude: | 9.435 |
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