| C1900.0 | : | 11011-2645 |
|---|---|---|
| C2000.0 | : | 110557570-27171627 |
| Comp. | : | |
| Magn. | : | 5.64(V) |
| Spect. | : | B8III-IV ; B8.5V |
| Bayer $\chi^2$ Hya | CD -26 8342 | CPD -26 4440 | GAIADR2 3532312225289255040 |
| GAIADR3 3532312225289255040 | HD 96314 | HIP 54255 |
| Element | Value | Std. dev. | |
|---|---|---|---|
| Period (d.) | : | 2.2677 | |
| Primary minimum (xJD-2,400,000.0) | : | 39925.545 | |
| Reference T0/epoch | : | JD | |
| Eccentricity | : | 0.0 | |
| omega primary (deg.) | : | 0.0 | |
| K1 (km/s) | : | 123.3 | |
| K2 (km/s) | : | 168.9 | |
| V0 (km/s) | : | +30.6 | |
| sigma residuals primary | : | ||
| sigma residuals secondary | : | ||
| #RV primary | : | ||
| #RV secondary | : | ||
| Grade | : | 5.0 | |
| Contributor | : | DAO | |
| Status | : | PUB | |
| Bibcode | : | 1975A&A....44..445A | |
| Derived quantities (on the fly, from the above quantities) | |||
| a1sini (km) | : | 3.84488e+06 | 0 |
| a2sini (km) | : | 5.26683e+06 | 0 |
| m1sin**3 i (sol.mass) | : | 3.40125 | 0 |
| m2sin**3 i (sol.mass) | : | 2.48297 | 0 |
Andersen's observations superseded those of H. Mauder (Astron. Astrophys., 4, 437, 1970) which were obtained at much lower dispersion. The secondary star is appreciably fainter than the primary, and only the lines lambda 3933 of Ca II, and lambda 4481 of Mg II were measured in the secondary spectrum. Great care was taken in the selection of lines for measurement to avoid lines in which the two component spectra were likely to be badly blended. The orbit was assumed circular and the epoch is the time of primary minimum. D.M. Popper (Publ. Astron. Soc. Pacific, 95, 757, 1983) has published results obtained from Lick observations. They are very similar to those given in the Catalogue and this justifies upgrading those to a quality. Photoelectric observations were obtained by H. Mauder and U. Kohler (Astron. Astrophys., 1, 147, 1969) and rediscussed by Mauder (loc. cit.). They show a range of variation of about 0.3m in B. The inclination is about 76 deg. Andersen finds Delta MV=1.37; the effective temperatures of the two stars are similar.
