HR 1613: A Slowly Rotating A Dwarf Spectroscopic Binary with Solar Abundances

Details HR 1613: A Slowly Rotating A Dwarf Spectroscopic Binary with Solar Abundances HR 1613: A Slowly Rotating A Dwarf Spectroscopic Binary with Solar Abundances

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aj....132.1490f&link_type=abstract

The Astronomical Journal, Volume 132, Issue 4, pp. 1490-1495.

Astronomy and Astrophysics

Astronomy

3

Stars: Binaries: Spectroscopic, Stars: Fundamental Parameters, Stars: Individual (Hr 1613)

Scientific paper

From two sets of radial velocities we have obtained the orbital elements of HR 1613. This single-lined binary has an orbital period of 8.11128 days and a nearly circular orbit. The primary has an A9 V spectral type and a vsini value of 11 km s-1, while the unseen secondary is likely a K or M dwarf. Spectral classifications and spectrum synthesis analysis indicate that the abundances of the primary are normal. We reject the possibility that the primary of HR 1613 is seen nearly pole-on and instead argue that its rotational inclination is at least 20°, resulting in an equatorial rotational velocity of 30 km s-1 or less. Slowly rotating A stars almost always have spectrum peculiarities, being classified as either Ap or Am stars, but HR 1613, with its essentially solar abundances, appears to be an exception.

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