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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
| Prelimary Photoelectric Light Curve for DHK29=SAO 70629
The newly discovered eclipsing binary star DHK 29 = SAO 70629 has beenobserved photoelectrically from October 1992 to October 1993. With thelight curve coverage 75% complete, it is apparent that the initial1.9-day period reported in IB VS 3815 is the half-period. Three times ofprimary minima have been determined. New light elements are given.
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Observation and Astrometry data
| Constellation: | Cygnus |
| Right ascension: | 20h53m31.89s |
| Declination: | +34°44'46.1" |
| Apparent magnitude: | 8.322 |
| Distance: | 297.619 parsecs |
| Proper motion RA: | 6.5 |
| Proper motion Dec: | 1.4 |
| B-T magnitude: | 10.485 |
| V-T magnitude: | 8.501 |
Catalogs and designations:
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