## Basic data (System:653)

C1900.0 C2000.0 : 11011-2645 : 110557570-27171627 : : 5.64(V) : B8III-IV ; B8.5V

## Identifiers:

 Bayer $\chi^2$ Hya CD -26 8342 CPD -26 4440 HD 96314 HIP 54255

## Orbit

Element Value Std. dev. : 2.2677 : 39925.545 : 0.0 : 0.0 : 123.3 : 168.9 : +30.6 : : : : : 5.0 : DAO : PUB : 1975A&A....44..445A : 3.84488e+06 0 : 5.26683e+06 0 : 3.40125 0 : 2.48297 0

## Note

Andersen's observations superseded those of H. Mauder (Astron.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.


## Plot

Encapsulated PostScript file

D.Pourbaix