Seven-color Vilnius photometry of the open cluster NGC 752

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dc.creatorBartasiute, S.
dc.creatorDeveikis, V.
dc.creatorStraizys, V.
dc.creatorBogdanovicius, A.
dc.date2007-08-02
dc.date2007-08-02
dc.date.accessioned2026-07-07T10:36:21Z
dc.date.available2026-07-07T10:36:21Z
dc.descriptionNew photoelectric seven-color observations in the Vilnius system are presented for 65 stars in the region of the open cluster NGC 752. Based on individual stars with accurate photometric classifications, we determine the apparent distance modulus (m-M)=8.38 and the mean reddening to the cluster E(Y-V)=0.027, or E(B-V)=0.034. The mean photometric metallicity for the main-sequence stars, [Fe/H]=-0.14, is found to be slightly lower than that derived for the red clump giants, [Fe/H]=-0.08. This difference suggests that red giants in later evolutionary phases may not have zero-age surface values of [Fe/H]. We made use of the least-squares minimization techniques to fit the Padova theoretical isochrones to the CMD, when the binary star population is taken into account. By varying the distance modulus, metallicity and age, the best match has been found between the seven magnitudes and colors of the observed stars and those of model binaries, which gives the distance modulus by 0.2 mag smaller than that derived from individual stars, i.e., (m-M)=8.18, a closely similar metallicity ([Fe/H]=-0.12), and age of 1.6 Gyr. With these results, the fraction of photometric binaries among the main-sequence stars is ~40%.
dc.description28 pages, 7 figures, accepted for Baltic Astronomy
dc.identifierhttps://arxiv.org/abs/0708.0391
dc.identifierhttp://arxiv.org/abs/0708.0391
dc.identifierBalticAstron.16:199-226,2007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180023
dc.subjectAstrophysics
dc.titleSeven-color Vilnius photometry of the open cluster NGC 752
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