Abstract
Ultraviolet photometry from the GALEX mission is compiled for a sample of main sequence stars and red giants in the open cluster NGC 752. This is one of the few ensembles of coveal near-solar abundance FGK stars for which near-ultraviolet and far-ultraviolet magnitudes are available from GALEX. Cluster members are identified on the basis of Gaia proper motion and parallax data. Two-colour diagrams, including \((NUV-B, B-V)\) and \((FUV-B, B-V)\), are presented by combining the GALEX photometry with Johnson \(BV\) photometry. In all diagrams which include the \(NUV\) magnitude in one of the colours a clear offset is seen between the unevolved main sequence and the main sequence turn-off stars. However, in the \((FUV-B, B-V)\) diagram the main sequence and the turn-off stars overlap. There is evidence of scatter in the \((FUV-B)\) colours of main sequence stars redward of \((B-V) \sim 0.50\) that may be related to differences in stellar activity. A GALEX-only colour-magnitude diagram of NGC 752 in which \(NUV\) apparent magnitude is plotted against the \((FUV-NUV)\) colour shows much less separation of the main sequence turn-off stars and red giants from the dwarf sequence than does a traditional \((V, B-V)\) colour-magnitude diagram. Indeed, in the former diagram the red giants of NGC 752 fall very close to the main sequence.
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Notes
Sakai et al. (2012) give a report on a ground-based H\(\alpha \) imaging counterpart to this GALEX program.
Website: webda.physics.muni.cz.
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Acknowledgements
The author gratefully acknowledges the support of the National Science Foundation of the United States through award AST-1517791. The GALEX photometry presented in this paper was obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This research has made use of the WEBDA database, operated at the Department of Theoretical Physics and Astrophysics of the Masaryk University.
This work has made use of data from the European Space Agency (ESA) mission Gaia,Footnote 5 processed by the Gaia Data Processing and Analysis Consortium (DPAC).Footnote 6 Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
We thank the referee for helpful comments on the manuscript.
Funding
The research leading to these results received funding from the National Science Foundation of the United States under Award AST-1517791.
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Smith, G.H. GALEX photometry of the open cluster NGC 752. Astrophys Space Sci 366, 108 (2021). https://doi.org/10.1007/s10509-021-04012-7
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DOI: https://doi.org/10.1007/s10509-021-04012-7