HD 105020 is probably a long-period binary

Details HD 105020 is probably a long-period binary HD 105020 is probably a long-period binary

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993cha%26a..17..377t&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 17, Issue 4, p. 377-382.

Astronomy and Astrophysics

Astrophysics

1

Star, Binaries, Spectroscopic Binaries

Scientific paper

Archer declared HD 105020 to be an Algol-type binary with a K-type main star and a period as short as two days. This, if confirmed, would be very significant. We made 21 observations of this star on three nights in 1984 using the 2.0-m telescope and Reticon system of McDonald Observatory, and 3 observations on two nights in 1991 using the 2.1-m telescope with TI2 CCD system of Kitt peak Observatory and found (1) that the radial velocity varied little over successive nights and the spin velocity to be small, hence it cannot be an Algol star with a two-day period and (2) that the radial velocity varied considerably at different times, and that the star could well be a spectroscopic binary with a period of about 20 days.

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