| Issue |
A&A
Volume 427, Number 3, December I 2004
|
|
|---|---|---|
| Page(s) | 933 - 936 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20041449 | |
| Published online | 16 November 2004 | |
A new Böhm-Vitense gap in the temperature range 5560 to 5610 K in the main sequence *,**
1
Astronomical Observatory of Odessa National University and Isaac Newton Institute of Chile, Shevchenko Park, 65014, Odessa, Ukraine e-mail: val@deneb.odessa.ua
2
Observatoire Aquitain des Sciences de l'Univers, CNRS UMR 5804, BP 89, 33270 Floirac, France
Received:
10
June
2004
Accepted:
20
July
2004
Highly precise temperatures (
K) have been determined from
line depth ratios for a set of 248 F-K field dwarfs
of about solar metallicity (
),
based on high resolution
(
), high 
echelle spectra.
A new gap has been discovered in the distribution
of stars on the Main Sequence in the temperature range 5560 to 5610 K.
This gap coincides with a jump in the microturbulent velocity 
and the well-known Li depression near 5600 K in field dwarfs
and open clusters. As the principal cause of the observed
discontinuities in stellar properties
we propose the penetration of the convective zone
into the inner layers of stars slightly less massive than the Sun
and related to it, a change in the temperature gradient.
Key words: stars: fundamental parameters / convection / stars: Hertzsprung-Russell (HR) and C-M diagrams / stars: abundances
© ESO, 2004
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