Blue stragglers in open clusters. III. NGC 7789

Details Blue stragglers in open clusters. III. NGC 7789 Blue stragglers in open clusters. III. NGC 7789

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...366..490s&link_type=abstract

Astronomy and Astrophysics, v.366, p.490-497 (2001)

Astronomy and Astrophysics

Astrophysics

6

Stars: Open Clusters And Associations: Individual: Ngc 7789, Stars: Blue Stragglers, Stars: Abundances

Scientific paper

We performed for the first time a detailed LTE spectroscopic study of a sample of blue straggler stars in the moderately old open cluster NGC 7789. For eight stars the parameters and abundances of several elements were determined. The cluster members show a remarkable surface magnesium deficiency which is quite unusual for late B - early A stars. Iron and titanium abundances are in agreement with other photometric and spectroscopic estimates of the NGC 7789 metallicity. All the confirmed blue stragglers have rather low projected rotational velocities (with one exception for K88, vsin i = 80 km s-1). Based on the spectra collected at Kitt Peak National Observatory, operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation, and at the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Plank Institute for Astronomy, Heidelberg, jointly with the Spanish National Commission for Astronomy.}

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