A probable pre-main sequence chemically peculiar star in the open cluster Stock 16
2014
We used the Ultraviolet and Visual Echelle Spectrograph of the
ESO-Very Large Telescope to obtain a high resolution and high
signal-to-noise ratio spectrum of Stock 16-12, an early-type
star which previous Delta a photometric observations suggest
being a chemically peculiar (CP) star. We used spectral
synthesis to perform a detailed abundance analysis obtaining an
effective temperature of 8400 +/- 400 K, a surface gravity of
4.1 +/- 0.4, a microturbulence velocity of 3.4(-0.3)(+0.7)
km/s, and a projected rotational velocity of 68 +/- 4 km/s. We
provide photometric and spectroscopic evidence showing the star
is most likely a member of the young Stock 16 open cluster (age
3-8 Myr). The probable cluster membership, the star's position
in the Hertzsprung-Russell diagram, and the found infrared
excess strongly suggest the star is still in the
pre-main-sequence (PMS) phase. We used PMS evolutionary tracks
to determine the stellar mass, which ranges between 1.95 and
2.3 M(Sun), depending upon the adopted spectroscopic or
photometric data results. Similarly, we obtained a stellar age
ranging between 4 and 6 Myr, in agreement with that of the
cluster. Because the star's chemical abundance pattern
resembles well that known of main sequence CP metallic line
(Am) stars, the object sets important constraints to the
diffusion theory. Additional spectroscopic and
spectropolarimetric data allowed us to conclude that the object
is probably a single non-magnetic star.
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