Photometric monitoring of pre-main-sequence stars. IV - Shell variability in the Herbig Be star HD 97048

Details Photometric monitoring of pre-main-sequence stars. IV - Shell variability in the Herbig Be star HD 97048 Photometric monitoring of pre-main-sequence stars. IV - Shell variability in the Herbig Be star HD 97048

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..271d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Sept. 15, 1991, p. 271-276. Research supported by

Astronomy and Astrophysics

Astronomy

10

Astronomical Photometry, B Stars, Main Sequence Stars, Stellar Envelopes, Interstellar Extinction, Near Infrared Radiation, Ubv Spectra, Variability

Scientific paper

Infrared and optical photometry of the Herbig Be star HD 97048 obtained at intervals over a period of about 1000 d is discussed. This shows that although the optical (BVRI) magnitude of the star has remained virtually constant, the star appears variable at Stromgren u, Johnson U and near-infrared (JHKL) wavelengths. This behavior is interpreted as being the result of the variability of an active shell, superimposed on a star that is photospherically inactive. Variations in the flux shortward of the B-band directly influence the U magnitude and, by affecting the temperature of a circumstellar dust shell, cause the variability detected in the infrared. The photometry indicates that the ratio R of total-to-selective extinction in the direction of HD 97048 is larger than the interstellar value, and that most of the reddening is intracloud rather than interstellar or circumstellar. Parameters of the ionized envelope are derived.

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