Photoelectric photometry of peculiar and related stars. II Delta-a-photometry of 339 southern Ap-stars

Details Photoelectric photometry of peculiar and related stars. II Delta-a-photometry of 339 southern Ap-stars Photoelectric photometry of peculiar and related stars. II Delta-a-photometry of 339 southern Ap-stars

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123...48m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 48-60. Sponsorship: Fonds zur Foerderung der Wissens

Astronomy and Astrophysics

Astrophysics

49

A Stars, Peculiar Stars, Star Distribution, Stellar Spectrophotometry, Extinction, Hot Stars, Milky Way Galaxy, Southern Sky, Standard Deviation, Temperature Dependence

Scientific paper

Delta-a system photometry of the sample of Ap stars from Bidelman and McConnell's (1973) catalogue is discussed. Comparing delta-a measurements in four marginally different systems, slight modifications of the delta-a photometric system are found to be uncritical except for the wavelength of the depression filter g2. The reddening-free index is very efficient for silicon and chromium stars, and the spectroscopic detection probability for these stars decreases with decreasing temperature. Comparison of delta-a results with the Geneva index delta (V1-G) confirms that the latter's efficiency in recognizing peculiarity drops strongly from hot to cool Ap stars. A decrease of delta-a towards the hot Ap stars is found using the a vs. (u-b) diagram, implying that b-v is an unsuitable temperature indicator for such stars. The low average intrinsic variability of the delta-a in the sample, when compared with the small variation of integrated surface magnetic fields in case of dipole configuration, implies that the wavelength 5200 feature correlates with the surface magnetic field strength.

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