Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141..116j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 1, Dec. 1984, p. 116-126. Research supported by the Swiss National Sc
Astronomy and Astrophysics
Astrophysics
10
Astronomical Photometry, Convective Flow, Main Sequence Stars, Stellar Atmospheres, A Stars, Algorithms, Astronomical Catalogs, F Stars, Open Clusters, Stellar Color
Scientific paper
A gap among A-F stars is searched on the main sequence of different stellar samples in the photometric space M defined by the four color indexes U-B1, B1-B2, B2-V1 and V1-G of the Geneva photometric system. A gap is noticed for the field and the eight young open clusters investigated when selected stars are not visual or spectroscopic binaries, and not chemically peculiar. It is shown that this gap is induced by the existence of two differently oriented star branches in M, the so-called radiative and convective branches. The gap is suggested not to be only a mere artefact of having previously excluded Am and Ap stars but partly due to an abrupt onset of convection in late A stars as proposed by Boehm-Vitense (1970). The locus of the gap's red edge according to B2-V1 with regard to the diffusion region, the lower instability strip and the low rotational velocities domain supports the idea that the onset of convection lowers the metallicity, stabilizes the pulsations and brakes the rotation. The locus of the gap's blue edge seems to be connected with age.
No associations
LandOfFree
The Boehm-Vitense gap in the Geneva photometric system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Boehm-Vitense gap in the Geneva photometric system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Boehm-Vitense gap in the Geneva photometric system will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-732894