The nature of TT Hydrae

Details The nature of TT Hydrae The nature of TT Hydrae

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1204e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, April 1988, p. 1204-1225.

Astronomy and Astrophysics

Astronomy

28

Binary Stars, Light Curve, Spectral Energy Distribution, Stellar Mass Ejection, Ubv Spectra, Cool Stars, Energy Spectra, Hot Stars, Iue, Stellar Color

Scientific paper

Photometric solutions are made of previously published photoelectric light curves of TT Hydrae. The WINK model is employed to give radii of rA = 0.0894 and rB = 0.2431, and an orbital inclination of i = 84.4 deg. Spectrophotometry is presented and analyzed to give revised spectral types of B9.5 V and phase-variable G9 to K1 III-IV, and temperatures of TA = 9800K and TB = 4850 - 4670K. There is anomalous photometric behavior indicative of circumstellar material surrounding the primary component. The near-ultraviolet excess seen during totality is verified by spectrophotometry, and found to extend to ≡4200 Å. Photospheric features of Si II, Mg II, and He I are consistent with a B9.5 V classification for the hotter star, and give a v sin i of 168 km s-1. The metallic-line spectrum (similar to an A2) and sharp hydrogen-line cores, both associated with the hotter star, arise almost totally from circumstellar material. The mass ratio is combined with a preliminary spectroscopic orbit for the cooler star to derive the component properties: MA = 2.25 M_sun;, MB = 0.41 M_sun;, RA = 1.90 R_sun;, and RB = 5.17 R_sun; The radiative properties imply that the system is 193 pc distant.

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