| C1900.0 | : | 11083-2555 |
|---|---|---|
| C2000.0 | : | 111312497-26275425 |
| Comp. | : | |
| Magn. | : | 7.25 ; 9.02 |
| Spect. | : | A3e ; (G5) |
| CD -25 8531 | CPD -25 4711 | GAIADR2 3532612598122182272 | GAIADR3 3532612598122182272 |
| GCVS TT Hya | HD 97528 | HIP 54807 |
| Element | Value | Std. dev. | |
|---|---|---|---|
| Period (d.) | : | 6.9534 | |
| Periastron time (xJD-2,400,000.0) | : | 24620.488 | |
| Reference T0/epoch | : | JD | |
| Eccentricity | : | 0.12 | |
| omega primary (deg.) | : | 319.8 | |
| K1 (km/s) | : | 41.2 | |
| K2 (km/s) | : | ||
| V0 (km/s) | : | +17.5 | |
| sigma residuals primary | : | ||
| sigma residuals secondary | : | ||
| #RV primary | : | ||
| #RV secondary | : | ||
| Grade | : | 2.0 | |
| Contributor | : | DAO | |
| Status | : | PUB | |
| Bibcode | : | 1946ApJ...103...71S | |
| Derived quantities (on the fly, from the above quantities) | |||
| a1sini (km) | : | 3.91092e+06 | 0 |
| f(m) (sol.mass) | : | 0.0494882 | 0 |
The elements derived by Sahade and Cesco have been preferred although the solution was a graphical one and Lucy & Sweeney question the reality of the orbital eccentricity. R.F. Sanford (Astrophys. J., 86, 153, 1937) found a smaller value of K1. D.M. Popper, as quoted by A.G. Kulkarni and K.D. Abhyankar (J. Astrophys. Astron., 2, 119, 1981), has found preliminary values of K1=35 km/s and K2=130 km/s. Undoubtedly, Popper's study -- when it is published -- will supersede the others. The first observations of the D-line of the secondary spectrum were reported by E.W. Miller and D.H. McNamara, (Publ. Astron. Soc. Pacific, 75, 346, 1963) who also noted the presence of H-alpha in emission. Several emission-lines of non-stellar origin, in the ultraviolet, have been reported by M.J. Plavec (Bull. Am. Astron. Soc., 19, 708, 1987). These will probably turn out to be related to distortions in the velocity-curve found by Sahade and Cesco. Photoelectric UBV light-curves have been obtained and analyzed by Kulkarni and Abhyankar (op. cit.) and re-analyzed by J. Koul and K.D. Abhyankar (J. Astrophys. Astron., 3, 93, 1982) and P.B. Etzel (Bull. Am. Astron. Soc., 18, 976, 1986). Agreement between the various analyses is not fully satisfactory. The orbital inclination is well over 80 deg, the magnitude difference (Delta V) between components is between 1.0m and 1.5m. Spectral types are A0 V or A1 V and K1 III or G8 III.
