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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
| Stars with the Largest Hipparcos Photometric Amplitudes
A list of the 2027 stars that have the largest photometric amplitudes inHipparcos Photometry shows that most variable stars are all Miras. Thepercentage of variable types change as a function of amplitude. Thiscompilation should also be of value to photometrists looking forrelatively unstudied, but large amplitude stars.
| Precise Coordinates of Variable Stars (1)
Not Available
| The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
| Southern and equatorial irregular variables. II. Optical spectroscopy
The results of optical spectroscopy of 169 southern and equatorialobjects previously known as irregular variables are presented. Thetargets were selected via photoelectric UBV photometry among objectsclassified as L, L:, I, I:, IS and IS: in the General Catalogue ofVariable Stars and New Catalogue of Suspected Variable Stars. Amongthese objects we have identified 8 cataclysmic variables, 8 symbioticstars and stars that belong to a variety of other classes. Based onobservations made at Cerro Tololo Interamerican Observatory--CTIO,Chile, and Laboratorio Nacional de Astrofisica/CNPq, Brazil.
| Classification and Identification of IRAS Sources with Low-Resolution Spectra
IRAS low-resolution spectra were extracted for 11,224 IRAS sources.These spectra were classified into astrophysical classes, based on thepresence of emission and absorption features and on the shape of thecontinuum. Counterparts of these IRAS sources in existing optical andinfrared catalogs are identified, and their optical spectral types arelisted if they are known. The correlations between thephotospheric/optical and circumstellar/infrared classification arediscussed.
| Southern and equatorial irregular variables. I. Photoelectric photometry
We present the results of an optical photometric survey of 616 irregularvariables. The targets were selected among objects classified as L, L:,I, I:, IS and IS: in the General Catalogue of Variable Stars and NewCatalogue of Suspected Variable Stars. Based on observations made atLaboratorio Nacional de Astrofisica/CNPq, Brazil. Table 1 only availablein electronic form at CDS via ftp cdsarc.u-strasbg.fr (130.79.128.5) orvia http://cdsweb.u-strasbg.fr/Abstract.html
| IRAS catalogues and atlases - Atlas of low-resolution spectra
Plots of all 5425 spectra in the IRAS catalogue of low-resolutionspectra are presented. The catalogue contains the average spectra ofmost IRAS poiont sources with 12 micron flux densities above 10 Jy.
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Observation and Astrometry data
| Constellation: | Οκτάς |
| Right ascension: | 21h55m10.77s |
| Declination: | -76°56'26.4" |
| Apparent magnitude: | 8.209 |
| Distance: | 378.788 parsecs |
| Proper motion RA: | 35.3 |
| Proper motion Dec: | 5.3 |
| B-T magnitude: | 10.202 |
| V-T magnitude: | 8.374 |
Catalogs and designations:
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