Characteristics and interpretation of the photometric variability of Eta Carinae and its nebula

Details Characteristics and interpretation of the photometric variability of Eta Carinae and its nebula Characteristics and interpretation of the photometric variability of Eta Carinae and its nebula

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ssrv...39..317v&link_type=abstract

Space Science Reviews (ISSN 0038-6308), vol. 39, Nov.-Dec. 1984, p. 317-373.

Physics

72

Light Curve, Nebulae, Peculiar Stars, Stellar Luminosity, Stellar Spectrophotometry, Variable Stars, Bolometers, Hertzsprung-Russell Diagram, Interstellar Extinction, Spectral Energy Distribution, Stellar Envelopes, Stellar Magnitude, Stellar Mass, Stellar Mass Ejection, Stellar Temperature

Scientific paper

The peculiar variable object Eta Car is characterized in a review of observational data (from the 17th century on) and theoretical investigations, with a focus on observations obtained with the Walraven simultaneous VBLUW photometer on the 90-cm light collector, first (1974-1978) at Leiden Southern Station, South Africa, and then (1979-1983) at ESO. The data are presented in tables and graphs and discussed in detail. Findings reported include foreground reddening E(B-V)J = 0.50 mag, homunculus-dust reddening less than 0.6 mag, bolometric magnitude -12.3 + or - 0.2 mag, star radius 96 solar radii (for Teff = 30,000 K), star mass 150 solar mass, mass-loss rate 0.0001 solar mass/yr, and homunculus mass 0.15 solar mass. The 9-mag decrease in light since the maximum in 1843 is attributed to a 2.5-mag decrease in luminosity excess, a 3-mag drop in S Dor effects (probably present since the 17th century), and a 3.5-mag extinction by circumstellar dust, while the recent small-amplitude changes are the result of central-star temperature variations.

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