Search for variable stars in the open cluster NGC 2539
| Autor: | Y.-B. Jeon, M.-Y. Chun, T. S. Yoon, H. B. Ann, Myung Gyoon Lee, K. J. Choo, Seung-Lee Kim, In-Soo Yuk, Hwankyung Sung, Byeong-Gon Park |
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| Rok vydání: | 2003 |
| Předmět: |
Physics
Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Light curve Blue straggler Hubble sequence symbols.namesake Distance modulus Space and Planetary Science Binary star symbols Cluster (physics) Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Variable star Instability strip Astrophysics::Galaxy Astrophysics Open cluster |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361:20021704 |
| Popis: | We present UBVIabsolute and V-band time-series CCD photometric results for the intermediate-age open cluster NGC 2539. From the empirical zero-age main sequence and theoretical isochrone fitting in color-color and color-magnitude diagrams, we estimated the physical parameters of this cluster as follows: the color excess of E(B − V) = 0.06 ± 0.03, the distance modulus of (V − MV)0 = 10.2 ± 0.1 and the age of logt = 8. 8( ∼630 Myr). By carefully examining the time-series images, we discovered seven new variable stars in the observed cluster field. Considering the light curves, periods and positions on the color-magnitude diagram, we classified them as five eclipsing binary stars, one δ Scuti star and one γ Doradus candidate. The γ Doradus candidate might not be a cluster member because it is located redder by about ∆(B −V) = 0.2 than the cool edge of γ Doradus instability strip. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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