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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
| Liste et classification d'étoiles nouvelles M,S,C et à émission Not Available
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משמש של הקבוצה הבאה
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תצפית ומידע אסטרומטרי
קבוצת-כוכבים: | הרקולס |
התרוממות ימנית: | 17h08m46.60s |
סירוב: | +29°31'23.4" |
גודל גלוי: | 8.564 |
מרחק: | 387.597 פארסק |
תנועה נכונה: | -2.3 |
תנועה נכונה: | 0.8 |
B-T magnitude: | 10.464 |
V-T magnitude: | 8.721 |
קטלוגים וכינוים:
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