Vilnius Photometry of Red Giant Stars in the Open Cluster NGC 7789

Authors: Bartašiutė, Stanislava1; Tautvaišienė, Gražina2

Source: Astrophysics and Space Science, Volume 294, Numbers 3-4, December 2004 , pp. 225-240(16)

Publisher: Springer

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Photoelectric Vilnius seven-color photometry is presented and analyzed for a sample of 24 red giant branch and clump stars in the open cluster NGC 7789. For each star we have determined photometric spectral type, absolute magnitude, interstellar reddening, effective temperature, metallicity, and surface gravity. From averages over the stars in the sample we find the mean reddening to the cluster E YV = 0.21± 0.02 (s.d.), or E BV = 0.25, and the apparent distance modulus (mm) V = 12.21± 0.10 (s.d.), which yield a distance of 1840 pc. The mean overall metallicity is found to be [Fe/H] = −0.18± 0.09 (s.d.). The clump stars, on average, appear to be slightly more metal-rich than the other red giants, which is most probably caused by evolutionary changes of carbon and nitrogen molecular bands falling in the photometric passbands. A difference in mass between the two groups of stars has also been detected, which suggests that the clump stars might have undergone extra mass loss before reaching their core He-burning phase of evolution.

Keywords: open clusters: NGC 7789; stars: fundamental parameters; stars: red giant branch; techniques: photometric

Document Type: Research Article


Affiliations: 1: Vilnius University Observatory, Čiionio 29, LT-03100, Vilnius, Lithuania, Email: 2: Institute of Theoretical Physics and Astronomy, Vilnius University, Goštauto 12, LT-01108, Vilnius, Lithuania,

Publication date: December 1, 2004

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