THE CORRELATION BETWEEN Hα EMISSION AND VISUAL MAGNITUDE DURING LONG-TERM VARIATIONS IN CLASSICAL Be STARS

H alpha equivalent widths and UBV magnitudes are calculated for Be star disk models that grow in size and/or density with time. We show that these simple models are consistent with the known Be star classes of positive and inverse correlations between long-term variations in H alpha and V magnitude...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 765; no. 1; pp. 1 - 14
Main Authors Sigut, T A A, Patel, P
Format Journal Article
LanguageEnglish
Published 01.03.2013
Subjects
Correlation
Density
Disks
Inverse
Mathematical models
Photometry
Stars
Strength
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Summary:H alpha equivalent widths and UBV magnitudes are calculated for Be star disk models that grow in size and/or density with time. We show that these simple models are consistent with the known Be star classes of positive and inverse correlations between long-term variations in H alpha and V magnitude as identified by Harmanec. We support the conclusion of Harmanec that the distinction is controlled by the inclination of the disk to the line of sight. We demonstrate that the strength of these correlations, particularly those of an inverse correlation where the system becomes fainter as the H alpha emission strength grows, is strongly influenced by the scale height of the inner Be star disk and the extent of the gravitational darkening of the central B star due to rapid rotation. This dependence may allow coordinated spectroscopic and photometric observations to better constrain these poorly known Be star parameters.
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SourceType-Scholarly Journals-1
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ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/765/1/41