Geometry and physical conditions in the stellar wind of AG Carinae

• DOI: 10.1086/174241
• Publication Date: 2002-07-26T18:37:00Z
• Authors: Claus Leitherer; Richard Allen; Bruce Altner; Augusto Damineli; Laurent Drissen; Thais Idiart; Olivia Lupie; Antonella Nota; Carmelle Robert; Werner Schmutz; Steven N. Shore
• Keywords: Orion Nebula; Ultraviolet

view Abstract Citations (90) References (104) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Geometry and Physical Conditions in the Stellar Wind of AG Carinae Leitherer, Claus ; Allen, Richard Altner, Bruce Damineli, Augusto Drissen, Laurent Idiart, Thais Lupie, Olivia Nota, Antonella Robert, Carmelle Schmutz, Werner Shore, Steven N. is one prototypes class Luminous Blue Variables (LBVs). Since 1990 star has continuously brightened its visual continuum. We report on a multi-instrument -wavelength observing campaign to monitor current activity phase Car. Ground-based photometry, polarimetry, spectroscopy, space-ultraviolet spectroscopy spectropolarimetry have been obtained. From variability polarization at ultraviolet optical wavelengths we detect significant intrinsic polarization. Pint greater than or equal 0.5% large value for hot, luminous star, suggesting departure from spherical symmetry wind The variable timescale 2 months less. measured (intrinsic + interstellar) dropped 1992 May returned 1% July. results are interpreted terms outflow with density enhancement equatorial plane. A similar model was suggested related object R127 Large Magellanic Cloud (LMC). This geometry reminiscent large-scale morphology gas nebula dust 'jet' surrounding It therefore likely that physical conditions close stellar surface responsible spatially resolved circumstellar material around Despite drastic change photospheric conditions, mass-loss rate did not increase. find no evidence positive correlation between radius. makes models explain radius increase by opacity effects unlikely. mechanism temperature variations still unknown but most origin subphotospheric regions. Publication: Astrophysical Journal Pub Date: June 1994 DOI: 10.1086/174241 Bibcode: 1994ApJ...428..292L Keywords: Asphericity; Giant Stars; Mass Flow Rate; Envelopes; Evolution; Winds; Ultraviolet Astronomy; Variations; Abundance; Helium; Photometry; Polarimeters; Spectroscopy; Models; Astrophysics; POLARIZATION; STARS: EVOLUTION; INDIVIDUAL CONSTELLATION NAME: CARINAE; MASS LOSS; SUPERGIANTS; ULTRAVIOLET: STARS full text sources ADS | data products SIMBAD (6) MAST (2) INES (1) ESA