Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..471a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Nov. 15, 1984, p. 471-484. Research supported by t
Astronomy and Astrophysics
Astronomy
53
Astronomical Photometry, B Stars, Infrared Astronomy, Variable Stars, H Alpha Line, Stellar Envelopes, Stellar Luminosity
Scientific paper
The Be stars as a class have been studied. JHK (1.2, 1.65, 2.2 microns) magnitudes for 55 Be stars are presented along with L (3.5 microns) magnitudes for 15 of them. For 20 Be stars the observations reported in the present work are new. By geometric considerations it is shown that the energy input to the circumstellar (CS) envelope, by the Lyman continuum flux L(L,0) from the central star, cannot account for the observed continuum luminosity, L(IR), of the CS envelope. The bolometric luminosity of the central star, L(asterisk), is found to be correlated to L(IR). Selecting Be stars common to the photometric observations and the spectroscopic observations of Andrillat and Fehrenbach, it is shown that L(H-alpha), the luminosity of the H-alpha emission line, is proportional to L(IR). By combining the present observations with the previous available data it is shown that in the case of four Be stars significant infrared variations have occurred and that these are accompanied by variations in H-alpha equivalent widths.
Ashok Nagarhalli M.
Bhatt Harish C.
Joshi S. C.
Kulkarni Varsha P.
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