Stellar Classification from Simulated Diva Spectra. I. Solar Metallicity Stars
Abstract
The orbiting telescope with the Double Interferometer for Visual Astrometry (DIVA) will obtain, apart from astrometry, low-resolution spectra (lambda /Delta lambda =~ 20) covering the optical range (350 to 1000 nm) for over 10 million stars. The classification of such spectra according to T_e and log g for solar metallicity is investigated by synthetic photometry. Simulated DIVA raw data have been produced in the spectral range from 313 nm to 999 nm, with different degrees of binning of CCD pixels (four or eight) into photometric samples, leading to 66 and 32 spectral bands, respectively. The band width (resulting mainly from the PSF of the DIVA optics) varies between 16 and 38 nm for 66 bands and between 22 and 40 nm for 32 bands. Kurucz stellar model fluxes were scaled to V = 10, 11, 12, 13, 14 mag and appropriate photon and detector noise was added. The resulting DIVA spectra were subjected to stellar classification software. The results show that stellar classification with good astrophysical precision can be achieved for millions of stars, not affected by interstellar reddening.
- Publication:
-
Baltic Astronomy
- Pub Date:
- 1999
- DOI:
- 10.1515/astro-1999-0305
- Bibcode:
- 1999BaltA...8..385E
- Keywords:
-
- TECHNIQUES: PHOTOMETRIC;
- STARS: FUNDAMENTAL PARAMETERS;
- CLASSIFICATION;
- ORBITING OBSERVATORIES: DIVA