Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..58..245b&link_type=abstract
Astrophysics and Space Science, vol. 58, no. 1, Sept. 1978, p. 245-254. Research supported by the Indian Institute of Astrophys
Astronomy and Astrophysics
Astrophysics
11
A Stars, Radii, Stellar Spectra, Stellar Temperature, Abundance, Bolometers, Main Sequence Stars, Spectral Energy Distribution, Temperature Measurement, Wavelengths
Scientific paper
The effective temperatures, radii and bolometric magnitudes of Ap, Am and normal A stars have been estimated from their energy distribution curves between 478 nm and 680 nm. All the Am stars and one Ap star (i.e. fi CrB) were found to be affected by line blanketing, a rough estima- tion of which in the respective (B- V) colours has been found out in each case. The range in effective temperature is 0.45-0.60 in terms of Oe ( 5040ITe), while it is 1.8-4.8 R® in the case of radius, that in bolometric magnitude being from - O~P67 to + 1'~61. An approximate estimate of the masses shows that they are between 1.5 and 3.0 M0. All these estimates are in agreement with those of the normal A stars. The Ap and Am stars are found to be slightly evolved and, therefore, are probably in the hydrogen shell-burning phase
Babu S. D. G.
Rautela B. S.
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