22 research outputs found
Shared genetic risk between eating disorder- and substance-use-related phenotypes:Evidence from genome-wide association studies
First published: 16 February 202
A chemical analysis of five hot stars towards the Galactic centre
High resolution echelle spectroscopy is presented for thirteen stars
lying in the direction of the Galactic centre which, on the basis of
photographic photometry and low dispersion spectroscopy, have been
classified as early-B-type. Eight of these stars have large
rotational
velocities which preclude a detailed analysis. The five stars with
moderate to low projected rotational velocities
have been analysed using model atmosphere techniques to
determine atmospheric parameters and chemical compositions. Two of
these stars appear to be evolved blue horizontal branch objects on the
basis of their chemical compositions and small projected rotational
velocity. The evolutionary status of a third is ambiguous but it is
probably a post-asymptotic-giant branch star. The remaining two
objects are probably young massive stars and show enhanced abundances
of N, C, Mg and Si, consistent with their formation in the inner part
of the Galactic disk. However their O abundances are normal,
confirming results found previously for other early-type stars, which
would imply a flat abundance gradient for this element in the inner
region of our Galaxy