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Constraints on the Geometry of Circumstellar Envelopes: Optical Interferometric and Spectropolarimetric Observations of Seven Be Stars
- A. Quirrenbach, K. Bjorkman, B. Babler
- Physics, Geology
- 10 April 1997
We have obtained contemporaneous optical interferometry and spectropolarimetry of seven Be stars. The interferometry was done using both continuum and narrow Hα line filters to observe the…
PROBING THE GEOMETRY AND CIRCUMSTELLAR ENVIRONMENT OF SN 1993J IN M81
- H. D. Tran, A. V. Filippenko, G. Schmidt, K. Bjorkman, B. Jannuzi, P. Smith
- Physics
- 21 March 1997
We have monitored the polarized radiation of the Type IIb SN 1993J in M81 over a period of 41 days, starting from 7 days after the explosion on 1993 March 27.5 (UT). Our data show clear evidence that…
Spectroscopic observations of the δ Scorpii binary during its recent periastron passage
- A. Miroshnichenko, J. Fabregat, P. Blay
- Physics
- 27 June 2001
The bright star Delta Sco has been considered a typical B0-type object for many years. Spectra of the star published prior to 1990 showed no evidence of emission, but only of short-term line profile…
A Study of π Aquarii during a Quasi-normal Star Phase: Refined Fundamental Parameters and Evidence for Binarity
- K. Bjorkman, A. Miroshnichenko, D. McDavid, T. Pogrosheva
- Physics
- 20 March 2002
We present the results of recent multicolor photometric and high-resolution spectroscopic observations of the bright Be star π Aqr. Observational data collected from the literature were used to study…
CHARA Array K'-Band Measurements of the Angular Dimensions of Be Star Disks
- D. Gies, William G. Bagnuolo, Jr., P. Koubský
- Physics, Geology
- 18 September 2006
We present the first K′-band, long-baseline interferometric observations of the northern Be stars γ Cas, ϕ Per, ζ Tau, and κ Dra. The measurements were made with multiple telescope pairs of the CHARA…
Deriving the Geometry of Be Star Circumstellar Envelopes from Continuum Spectropolarimetry. I. The Case of ζ Tauri
- K. Wood, K. Bjorkman, J. Bjorkman
- Physics, Geology
- 10 March 1997
We present a general scheme for determining the circumstellar geometry of Be stars from modeling of optical continuum spectropolarimetry. Our modeling scheme utilizes a Monte Carlo radiation transfer…
Properties of the δ Scorpii Circumstellar Disk from Continuum Modeling
- A. Carciofi, A. Miroshnichenko, A. Magalhães
- Physics
- 10 March 2006
We present optical WBVR and infrared JHKL photometric observations of the Be binary system δ Sco obtained in 2000-2005, and mid-infrared (10 and 18 μm) photometry and optical (λλ3200-10500)…
OBSERVATIONS OF BINARY STARS WITH THE DIFFERENTIAL SPECKLE SURVEY INSTRUMENT. VI. MEASURES DURING 2014 AT THE DISCOVERY CHANNEL TELESCOPE
- E. Horch, G. Belle, James W. Davidson, Jr., Lindsay A. Ciastko, M. Everett, K. Bjorkman
- Physics
- 11 September 2015
We present the results of 938 speckle measures of double stars and suspected double stars drawn mainly from the Hipparcos Catalog, as well as 208 observations where no companion was noted. One…
DISK-LOSS AND DISK-RENEWAL PHASES IN CLASSICAL Be STARS. I. ANALYSIS OF LONG-TERM SPECTROPOLARIMETRIC DATA
- J. Wisniewski, Z. Draper, K. Bjorkman, M. Meade, J. Bjorkman, A. Kowalski
- Physics, Geology
- 8 December 2009
Classical Be stars are known to occasionally transition from having a gaseous circumstellar disk (“Be phase”) to a state in which all observational evidence for the presence of these disks disappears…
The relationship between γ Cassiopeiae’s X-ray emission and its circumstellar environment
- M. Smith, R. D. Oliveira, S. Ridgway
- Physics
- 31 January 2012
γ Cas is the prototypical classical Be star and is recently best known for its variable hard X-ray emission. To elucidate the reasons for this emission, we mounted a multiwavelength campaign in 2010…
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