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HD 66583


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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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Observation and Astrometry data

Constellation:とも座
Right ascension:08h02m50.54s
Declination:-34°32'44.5"
Apparent magnitude:7.308
Distance:561.798 parsecs
Proper motion RA:-24.2
Proper motion Dec:23.8
B-T magnitude:9.409
V-T magnitude:7.482

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 66583
TYCHO-2 2000TYC 7128-2044-1
USNO-A2.0USNO-A2 0525-07137738
HIPHIP 39365

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