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HD 28915


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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 varibility of M-stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971MNRAS.152..165S&db_key=AST

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Agcik
Sað Açýklýk:04h28m56.36s
Yükselim:-64°33'56.7"
Görünürdeki Parlaklýk:8.09
Uzaklýk:440.529 parsek
özdevim Sað Açýklýk:30.9
özdevim Yükselim:20.4
B-T magnitude:10.147
V-T magnitude:8.26

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 28915
TYCHO-2 2000TYC 8872-916-1
USNO-A2.0USNO-A2 0225-01156760
HIPHIP 20914

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