Hipparcos red stars in the HpVT2 and VIC systems
- Author(s)
- Imants Platais, Dimitri Pourbaix, Alain Jorissen, Valeri V Makarov, Leonid N. Berdnikov, N N Samus, Tom Lloyd Evans, Thomas Lebzelter, Julius Sperauskas
- Abstract
For Hipparcos M, S, and C spectral type stars, we provide calibrated instantaneous (epoch) Cousins V - I color indices using newly derived HpVT2 photometry. Three new sets of ground-based Cousins VI data have been obtained for more than 170 carbon and red M giants. These datasets in combination with the published sources of VI photometry served to obtain the calibration curves linking Hipparcos/Tycho Hp - VT2 with the Cousins V - I index. In total, 321 carbon stars and 4464 M- and S-type stars have new V - I indices. The standard error of the mean V - I is about 0.1 mag or better down to Hp ˜ 9 although it deteriorates rapidly at fainter magnitudes. These V - I indices can be used to verify the published Hipparcos V - I color indices. Thus, we have identified a handful of new cases where, instead of the real target, a random field star has been observed. A considerable fraction of the DMSA/C and DMSA/V solutions for red stars appear not to be warranted. Most likely such spurious solutions may originate from usage of a heavily biased color in the astrometric processing.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Johns Hopkins University, Vrije Universiteit Brussel, California Institute of Technology (Caltech), Anuchin Research Institute and Museum of Anthropology, Russian Academy of Sciences, University of St. Andrews, Vilnius University (VU)
- Journal
- Astronomy & Astrophysics
- Volume
- 397
- Pages
- 997-1010
- No. of pages
- 14
- ISSN
- 0004-6361
- Publication date
- 2003
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/44ec2b36-854d-4e2c-8540-0510ca8f09ab