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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.
| The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
| Near-infrared photometry of unidentified IRC stars. III - The Mira variables of spectral type M10
Less than two dozen visually bright Mira variables are known to exceedthe extremely late spectral type of M9.5 at minimum light. Near-infraredphotometry of the reddest unidentified sources in the Two-Micron SkySurvey has led to the identification and spectral classification of agroup of 38 additional M type Mira variables that reach M9.5, but whichon the average exhibit significantly larger amplitudes at 1 micron,longer periods, later spectral types, and redder near-infrared colorsthan the ones whose mean properties previously defined the coolest Miravariables. Periods and epochs of maximum light are given for 13 stars.Near-infrared magnitudes and photometric spectral types are also givenfor 107 additional unidentified IRC stars having less extreme spectraltypes, including 13 highly reddened early-M supergiants and four coolcarbon stars.
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Perseus |
| Ascensió Recta: | 03h08m47.54s |
| Declinació: | +37°02'44.6" |
| Magnitud Aparent: | 7.941 |
| Distancia: | 10000000 parsecs |
| Moviment propi RA: | 1.1 |
| Moviment propi Dec: | -4.5 |
| B-T magnitude: | 10.27 |
| V-T magnitude: | 8.134 |
Catàlegs i designacions:
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