Buradasınız

Anasayfa » Content

UV Leonis Çift Yildizinin BV Isik Egrisi Analizi (Seri A)

Analysis of the light curve of the star BV Dual UV Leonis (Series A)

Journal Name:

  • Çankaya University Journal of Arts and Sciences

Publication Year:

  • 2005

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
BV light and colour curves of the Algol type eclipsing binary UV Leo were obtained at the Ankara University Observatory during two nights in 2005, by using a 30 cm Maksutov-Cassegrain telescope. The light curves of UV Leo were analyzed using Wilson-Devinney code with the revised mass ratio. During the analysis, two dark spots on the secondary component's surface were assumed. Both spots are approximately 678 and 791 K cooler than their surrounding photosphere. The analysis yields that the orbital inclination for the system is 84 degrees and also the secondary component is approximately 261 K cooler than the primary one. The results of the photometric analysis were combined with Zwitter et al. (2003)'s spectroscopic elements and the following absolute parameters for the system were derived: Mı=1.11 ± 0.05 M0 , M2=1.02± 0.04 M©, R1=1.08 ± 0.03 R0, R2=1.33 ± 0.04 R0.
Bookmark/Search this post with
Abstract (Original Language): 
Algol türü bir örten çift yıldız olan UV Leo, 2005 gözlem sezonunda Ankara Üniversitesi Gözlemevi'nde 30 cm çaplı Maksutov-Cassegrain teleskobuyla B ve V renklerinde 2 gece gözlenmiş ve sistemin ışık ve renk eğrileri elde edilmiştir. UV Leo'nun her iki ışık eğrisi, güncel tayfsal kütle oranı dikkate alınarak Wilson-Deviney analiz programıyla ve ikinci bileşenin (soğuk) yüzeyinde iki farklı soğuk lekenin varlığı dikkate alınarak modellenmiştir. Her iki leke kendilerini çevreleyen fotosferden yaklaşık 678 ve 791 K daha soğuktur. Çift yıldızın yörünge eğim açısı yaklaşık 84 derece ve ikinci bileşenin birinci bileşenden yaklaşık 261 K daha soğuk olduğu bulunmuştur. Fotometrik analiz sonuçları Zwitter ve ark.'ın sunduğu tayfsal elementler ile birleştirilerek sistemin mutlak parametreleri için Mı=1.11 ± 0.05 M0, M2=1.02± 0.04 M0 , R1=1.08 ± 0.03 R0 R2=1.33 ± 0.04 R0 değeleri hesaplanmıştır.
FULL TEXT (PDF): 
PDF icon arastirmax-uv-leonis-cift-yildizinin-bv-isik-egrisi-analizi-seri.pdf
  • 1
11-18
  • Turkish

REFERENCES

References: 

P. Broglia, "Osservazioni fotoelettriche di due variabili a eclisse", Memorie della Societa Astronomia Italiana, 32 (1961) p. 43
T.
Borkovits
, I. B. Biro, T. Hegeduest, S. Csizmadia, T. Kovacs, A. Kospl, A. Pal, V. Konyves and A. Moor, "New Times of Minima of Eclipsing Binary Systems", Inform. Bull. Var. Stars, (2002) No. 5313
G. Djuraseviç, P. Rovithis, H. Rovithis-Livaniou and E. Fragoulopoulou, "UV Leo: The Binary With The Two
Suns", Astrophysics and Space Science, 296 (2005) 311- 314
A.Elmaslı, O. Aksu,
A
. Kara, B. Albayrak, T. Ak and S.O. Selam, "The Ligh-Time Effect in UV Leonis", The Light-Time Effect in Astrophysics, Proceedings of ASP Conference Series, Vol. 335, held in Brussels 19-22 July 2004. Editted b C. Sterken. San Francisco: Astronoical Society of the Pacific, (2005) pp. 287-
ESA, The Hipparcos and Tycho Catalogs, (1997), SP-1200
M. C.G. Frederik and P. B. Etzel, "A Photometric Analysis and Spot Model of the Detached Eclipsing Binary UV Leonis", The Astronomical Journal, 111 (1996) pp. 2081-2089
C. Hoffmeister, "132 neue Veraderliche", Astronomische Nachrichten, 253 (1934) p. 195
A. Jensch, "Beobachtungen an Veranderlichen", Astronomische Nachrichten, 257 (1935) p. 139
H. Mikuz, B. Dintinjana, A. Prsa, U. Munari and T. Zwitter, "Period change and Surface Activity of the Eclipsing
Binary UV Leonis", Inform. Bull. Var. Stars, (2002) No. 5338
D. M. Popper, "Rediscusion of Eclipsing Binaries. VII. WZ Ophiuchi and Other Solar-Type Stars", The
Astrophysical Journal,141 (1965) pp. 126-144 D. M. Popper, "Stellar Masses", Annual Review of Astronom and Astrophysics, 18 (1980) pp. 115-164
D.
M
. Popper, " Orbits of Detached Main-Sequence Eclipsing Binaries of Types Late F to K. II. UV Leonis, UV
Piscum and BH Virginis", The Astronomical Journal, 114, iss. 3, (1997) pp. 1195-1205 W. van Hamme, "New Limb-Darkening Coefficients for Modeling Binary Star Light Curves", The Astronomical
Journal,106 (1993) pp. 2096-2117 R. E. Wilson, Computing Binary Star Observables, Uni. of Florida, Astronomy Dept., (2003)
E. Wunder, "The First Period Change Discovered in the Bright Algol System UV Leonis", Inform. Bull. Var. Stars,
(1995) No. 4179
T. Zwitter, U. Munari, P.M. Marrese, A. Prsa, E.F. Milone, F. Boschi, T. Tomov and A. Siviero, "Evaluating GAIA Performances on Eclipsing Binaries II. Orbits and Stellar Parameters for V71 Tau, UV Leo and GK Dra", Astronony and Astrophyics, 404 (2003) pp. 333-340
18

Thank you for copying data from http://www.arastirmax.com