The infrared excess of peculiar A- and B-stars. II Correlation with stellar parameters

Details The infrared excess of peculiar A- and B-stars. II Correlation with stellar parameters The infrared excess of peculiar A- and B-stars. II Correlation with stellar parameters

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130..184g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 1, Jan. 1984, p. 184-190.

Astronomy and Astrophysics

Astrophysics

6

A Stars, B Stars, Infrared Stars, Peculiar Stars, Stellar Evolution, Stellar Magnitude, Astrometry, Radiant Flux Density, Star Distribution, Stellar Envelopes, Stellar Spectrophotometry, Stellar Temperature

Scientific paper

For 105 chemically peculiar stars of the upper main sequence (Teff = 30,000-7500 K) infrared magnitudes JHKLM have been measured by the authors (1983). Of the 410 JHKLM-measurements, the L- and M-magnitudes, especially the 'excess', are mainly used. Differences especially in the M-magnitude, claimed by Bonsack and Dyck (1983), can be explained by periodic variations of the M-magnitudes and partly by errors in the measurements of Bonsack and Dyck which always tend to fainter magnitudes. Correlations of the infrared excess in the M-band with stellar parameters such as rotational velocity, magnetic field, peculiarity index (the depression at 5200 A), and with the galactic distribution of the stars show a strong dependence of the strength of the IR-excess on age and temperature of the stars. A (less strong) correlation with peculiarity is found while the correlation with the magnetic field and the rotational velocity (period) could not be established. For stars with variable M-magnitude the variations are probably due to stellar rotation. The source of the IR-excess is still unknown.

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