Informace o publikaci

Stars with Discrepant v sin i as Derived from the Ca II 3933 and Mg II 4481 angstrom Lines. VII. HD 9531 (SB), HD 31592 (SB2), HD 129174 (SB?)



Rok publikování 2018
Druh Článek v odborném periodiku
Časopis / Zdroj Astrophysical Bulletin
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Klíčová slova stars: binary; stars: rotation; stars: individual: HD 9531; HD 31592; HD 129174
Popis In this paper of the series we analyze three stars listed among stars with discrepant v sin i: HD 9531 and HD 31592, which also show radial velocity variations inherent to spectroscopic binaries, and HD 129174 which is an Mn-type star with a possible magnetic field. In HD 9531 we confirm the radial velocity derived from the hydrogen lines as well as from the Ca II line at 3933 angstrom as variable. The profile of the calcium line also appears variable, and with the estimated magnetic induction B-e = -630 +/- 1340 G, this suggests that the abundance of calcium possibly varies over the surface of the star. We identified the lines of the secondary component in the spectrum of HD 31592 revealing thus it is an SB2 binary with B9.5V and A0V components. While the primary star rotates with v sin i = 50 km s(-1), the secondary star is faster with v sin i = 170 km s(-1). We find that only 60% of the Mn lines identified in the spectrum of HD 129174 can be fitted with a unique abundance value, whereas the remaining lines are stronger or fainter. We also identified two Xe II lines at 5339.33 angstrom and 5419.15 angstrom and estimated their log g f.