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HD 120809


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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 close binary V757 Centauri
The W UMa system V757 Cen has been observed photoelectrically in the UBVsystem at Bosque Alegre and at El Leoncito Observatories. Full lightcurves were constructed from 1135 V, 1104 B, and 1104 U individualobservations. An improved ephemeris based on about 12,000 cycles isgiven. A first classical solution for partial eclipses, determined withcomplementary spectroscopic data, suggests the system to be a contact WUMa star consisting of a larger component of spectral type G1-G2 andF9-G0 companion.

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观测天体数据

星座:半人馬座
右阿森松:13h52m28.78s
赤纬:-36°50'08.2"
视星:7.889
距离:826.446 天文距离
右阿森松适当运动:-17
赤纬适当运动:-1
B-T magnitude:9.918
V-T magnitude:8.057

目录:
适当名称   (Edit)
HD 1989HD 120809
TYCHO-2 2000TYC 7291-767-1
USNO-A2.0USNO-A2 0525-16695080
HIPHIP 67730

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