Infrared excess and H-alpha luminosity in Be stars - A constant thickness disc model

Details Infrared excess and H-alpha luminosity in Be stars - A constant thickness disc model Infrared excess and H-alpha luminosity in Be stars - A constant thickness disc model

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...210..295k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 210, no. 1-2, Feb. 1989, p. 295-302.

Astronomy and Astrophysics

Astrophysics

26

B Stars, H Alpha Line, Infrared Photometry, Irregular Variable Stars, Stellar Spectrophotometry, Astronomical Models, Balmer Series, Emission Spectra, Optical Thickness, Radiation Distribution, Stellar Envelopes

Scientific paper

Infrared excesses and H-alpha luminosities are derived for a sample of Be stars from previously published near-IR and IRAS photometry and H-alpha equivalent widths. Both IR excess and H-alpha emission are found to be correlated with spectral type. A disk model is used to interpret the correlation between H-alpha and IR excess. An analysis of the empirical L(H-alpha)-L(IR) relationship obtained from the model yields approximate values for the central densities of the disks which vary from 2 x 10 to the 11th/cu cm for Be stars of late subtype to 3 x 10 to the 12th/cu cm for early subtypes, while the density indices lie in the 1.5-2.5 range for the sample. The model parameters derived for the sample are shown to be consistent with prior studies of the optical depths and masses or Be star envelopes. The implications for the geometry of Be star disk models are discussed.

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