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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
| The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
| 2.2-micron field stars at the North Galactic Pole
The properties of the 2.2-micron field stars seen near the NorthGalactic Pole by the Two Micron Sky Survey and by surveys at highersensitivity are discussed. All the 2.2-micron sources found in thesesurveys can be identified with stars with known spectral types. Thedistribution of the 2.2-micron field stars appears to bewell-understood.
| The space distribution of late type stars in a North galactic pole region.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962AJ.....67...37U&db_key=AST
| A list of relatively cool stars in the vicinity of the north galacticpole.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1960AJ.....65..644U&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Cani da Caccia |
| Ascensione retta: | 12h31m59.43s |
| Declinazione: | +43°28'58.8" |
| Magnitudine apparente: | 9.68 |
| Moto proprio RA: | -27.6 |
| Moto proprio Dec: | 5.8 |
| B-T magnitude: | 11.351 |
| V-T magnitude: | 9.818 |
Cataloghi e designazioni:
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