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New periodic variables from the Hipparcos epoch photometry
Two selection statistics are used to extract new candidate periodicvariables from the epoch photometry of the Hipparcos catalogue. Theprimary selection criterion is a signal-to-noise ratio. The dependenceof this statistic on the number of observations is calibrated usingabout 30000 randomly permuted Hipparcos data sets. A significance levelof 0.1 per cent is used to extract a first batch of candidate variables.The second criterion requires that the optimal frequency be unaffectedif the data are de-trended by low-order polynomials. We find 2675 newcandidate periodic variables, of which the majority (2082) are from theHipparcos`unsolved' variables. Potential problems with theinterpretation of the data (e.g. aliasing) are discussed.
| The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
| The upper main sequence of OB associations. I - Spectral types and lines of C and N of southern single-lined O stars
The single-line O stars belonging to the southern associations Vel OB1,Car OB1, Cen OB1, and Sco OB1 are studied. Their spectral type isderived in Conti's classification scheme for O stars, amended to includethe O9.7 subtype and to deal with fairly high S/N CCD spectra. Thebehavior of the C and N lines of these stars is studied in order todetermine whether CNO-processed material is visible at their surface.
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | אריה קטן |
| התרוממות ימנית: | 10h49m01.07s |
| סירוב: | +26°48'13.1" |
| גודל גלוי: | 8.719 |
| מרחק: | 515.464 פארסק |
| תנועה נכונה: | -2.5 |
| תנועה נכונה: | -10.6 |
| B-T magnitude: | 10.635 |
| V-T magnitude: | 8.878 |
קטלוגים וכינוים:
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