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Hipparcos red stars in the HpV_T2 and V I_C systems
For Hipparcos M, S, and C spectral type stars, we provide calibratedinstantaneous (epoch) Cousins V - I color indices using newly derivedHpV_T2 photometry. Three new sets of ground-based Cousins V I data havebeen obtained for more than 170 carbon and red M giants. These datasetsin combination with the published sources of V I photometry served toobtain the calibration curves linking Hipparcos/Tycho Hp-V_T2 with theCousins V - I index. In total, 321 carbon stars and 4464 M- and S-typestars have new V - I indices. The standard error of the mean V - I isabout 0.1 mag or better down to Hp~9 although it deteriorates rapidly atfainter magnitudes. These V - I indices can be used to verify thepublished Hipparcos V - I color indices. Thus, we have identified ahandful of new cases where, instead of the real target, a random fieldstar has been observed. A considerable fraction of the DMSA/C and DMSA/Vsolutions for red stars appear not to be warranted. Most likely suchspurious solutions may originate from usage of a heavily biased color inthe astrometric processing.Based on observations from the Hipparcos astrometric satellite operatedby the European Space Agency (ESA 1997).}\fnmsep\thanks{Table 7 is onlyavailable in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/397/997
| 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.
| Star formation in the VELA molecular clouds. I - The IRAS-bright Class I sources
Combining near-IR, IRAS, and millimeter molecular line data, thebrightest members of the Class I population in the Vela molecular cloudswere identified. The median luminosity is about 600 solar luminosities,corresponding to intermediate-mass Class I objects, which willeventually settle on the stellar main sequence as B stars. It issuggested that the theory of low-mass star formation is also applicableto the formation of higher-mass stars. It is proposed that the giantmolecular clouds in Vela, being stretched out along the galactic plane,provide a close-up view of typical, initially relatively quiescentgalactic star formation.
| Estrellas Rojas entre Popa y Cruz.
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Datos observacionales y astrométricos
| Constelación: | Popa |
| Ascensión Recta: | 08h02m50.54s |
| Declinación: | -34°32'44.5" |
| Magnitud Aparente: | 7.308 |
| Distancia: | 561.798 parsecs |
| Movimiento Propio en Ascensión Recta: | -24.2 |
| Movimiento Propio en Declinación: | 23.8 |
| B-T magnitude: | 9.409 |
| V-T magnitude: | 7.482 |
Catálogos y designaciones:
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