Defpos ile ζ oph hıı bölgesinden Hα ölçümleri

Yıl 2010, Cilt: 26 Sayı: 2, 179 - 189, 01.04.2010

Muhittin Şahan Nazım Aksaker İlhami Yeğingil

Öz

TÜBİTAK Ulusal Gözlemevi’nde (TUG, Antalya) bulunan RTT150 teleskopunun coudé çıkışına yerleştirilen DEFPOS (Çift Etalonlu Fabry Perot Optik Tayfölçeri) Gökadamızdaki (Samanyolu) iyonize olmuş ortamlarından gelen Hα salma çizgilerini ölçmek için kullanılmıştır [1]. O9.5 V tayf türlü ζ Oph yıldızının çevresindeki klasik HII bölgesinin 3 farklı noktasından Hα ışınım gözlemleri yapılmıştır. HII doğrultusunda yapılan ölçümlerden, ölçülen noktaların ortalama parlaklık değerleri 86 R ile 92 R (1 R 1 Rayleigh=106 /4 foton cm-2sn-1sr-1), ortalama LSR (Local standart of Rest Durgun Yerel Standart) hızları 1 km/s ile 3 km/s ve ortalama yarı genişlikleri de 23.44 km/s ile 24.4 km/s arasında olduğu görülmüştür. Sonuçların literatürde verilen değerler ile oldukça uyumlu olduğu görülmüştür. Bu çalışmada, önce DEFPOS tayfölçeri ve veri analizi hakkında, daha sonra, ζ Oph HII bölgesinden elde edilen veriler hakkında bilgi verilmiştir. Bu çalışmada, DEFPOS tayfölçeri ve veri analizi hakkında bilgi verildikten sonra, ζ Oph HII bölgesinden elde edilen veriler hakkında bilgi verilmiştir.

Anahtar Kelimeler

Fabry-Perot Tayfölçeri, Veri Analizleri, HII Bölgeleri, Gezegenimsi Bulutsular

Hα measurements toward ζ oph hii region with defpos

Öz

DEFPOS (Dual Etalon Fabry-Perot Optical Spectrometer) located in coudé exit of RTT150 telescope at TUBITAK National Observatory (TUG, Antalya) has used to measure Hα emission line from diffuse ionized gas in Our Galaxy (The Milk Way) [1]. Hα emission line observations were made in direction toward three different points of HII region around O9.5 V ζ Oph star. From observations toward HII region, we found the mean intensity to be 86 R and 92 R (1 R 1 Rayleigh =106 /4 photon cm-2s -1sr-1), the mean LSR velocity to be 1 km/s to 3 km/s and also the mean line-width approximately to be 23.44 km/s and 24.4 km/s. We found that our results are in close agreement with early results given in literature. In this study, we give information firstly about DEFPOS spectrometer and then its data analysis and methods finally about the data obtained from ζ Oph HII region.

Anahtar Kelimeler

Fabry-Perot spectrometer, Data Analysis, HII Regions, Planetary Nebulae

Kaynakça

• Şahan M., Yeğingil İ., Aksaker N., Hα Measurements Using DEFPOS/RTT150 Telescope Instrumentation and Observations, Research in Astronomy And Astrophysics, 9, 2, 237, 2009.
• Bland-Hawthorn J., Reynolds R.J., Gas In Galaxies, Encyclopedia of astronomy and astrophysics, MacMilan and Institute of Physics Publishing, 2000.
• Ferriere K. M., The Interstellar Environment of our Galaxy, Reviev of . Modern Physics, 73, 1031 (2001).
• Reynolds R. J., Optical Emission Line Studies And The Warm Ionized Component Of The Local Interstellar Medium, International Colloquium On The Local Interstellar Medium, 1984.
• Madsen G. J., Reynolds R. J., Haffner, L. M., A Multi wavelength Optical Emission Line Survey of Warm Ionized Gas in the Galaxy, The Astrophysical Journal, 652, 401, 2006.
• Reynolds R. J., Ionizing the Galaxy, Science, 277, 1997.
• Reynolds R. J., Haffner L.M., Madsen, G.J., Tree-Dimensional Studies of the Warm Ionized Medium in The Milky Way Using WHAM. Galaxies The Third Dimension, ASP Conference Proceedings, Vol. 282. Edited by Margarita Rosado, Luc Binette, and Lorena Arias, San Francisco Astronomical Society of the Pacific, 31, (2002).
• Reynolds R. J., The Radiative Ionization of The Interstellar Medium, The Warm Ionized Gas. ASP Conference Series, 35, 1993.
• Sharpless S., Osterbrock D, The Nearest H II Regions, Astrophysical Journal, 115, 89, 1952.
• Reynolds R.J., Roesler F.L., Scherb F., Harlander J., Fabry-Perot/CCD Multi Channel Spectrometer For The Study Of Warm Ionized Interstellar Gas And Extragalactic Clouds. SPIE, The International Society for Optical Engineering. Instrumentation In Astronomy, VII, 1235, 610, 1990.
• Morgan W. W., Code A. D., Whitford A. E., Studies in Galactic Structure. II. Lumınosıty Classification for 1270 Blue Giant Stars, Astrophysical Journal Supplement, 2, 41, 1955.
• Sivan J. P., A new Look At The Interstellar Hydrogen Through A Very-Wide-Field Photographic Halpha Survey Of The Whole Milky Way, Astrophysical Journal Supplement Series, 16, 163, 1974.
• Celnik W. E., Weiland, H., H-alpha- Observations Of The H II-region (S27) Around Zeta Ophiuchi”, Astronomy and Astrophysics, 192, 1-2, 316, 1988.
• Roesler F. L., “Fabry-Perot Instruments For Astronomy, Methods of Experimental Physics”, Academic Press. Inc. Part 12, 1974.
• Haffner L. M., Reynolds R. J., Tufte S. L., Madsen G. J., Jaehnig K. P., Percival J. W., The Wisconsin H-Alpha Mapper Northern Sky Survey, The Astrophysical Journal Supplement Series, 149, 2, 405, (2003).
• Fich M., Treffers R. R., Dahl G. P., Fabry-Perot H-alpha observations of Galactic H II regions, Astronomical Journal, 99, 622, 1990.
• Dennison B., Simonetti J.H., Topasna G.A. An Imaging Survey of Northern Galactic H- alpha,Emmission With Arcminute Resolution. PASA 15(1), 147, 1998.
• Gaustad J. E., McCullough P. R., Rosing, W., ve Van Buren, D., A Robotic Wide-Angle Hα Survey of the Southern Sky , The Publications of the Astronomical Society of the Pacific (PASP), 113, 1326, 2001.
• Tufte S. L., The WHAM Spectrometer Design, Performance Characteristics, and First Results, PhD. Thesis, University Of Wisconsin, Madison, 1997.
• Nossal S.M., Roesler F.L., Reynolds R.J., Haffner, M., Tufte, S., Bishop, J., Percival J. Geocoronal Hα intensity measurements using the Wisconsin Hα mapper Fabry–Perot facility, Journal of Geophys Research, 106, 5605, 2001.
• Mierkiewicz E.J., Roesler F.L., Nossal S.M., Reynolds R.J. Geocoronal hydrogen studies using Fabry-Perot interferometers, Part 1 Instrumentation, observations, and analysis, Journal of Atmospheric and Solar-Terrestrial Physics, 68, 1520, 2006.
• Şahan M., Aksaker N., Yeğingil İ., Observation of The Geocoronal Balmer Alpha With DEFPOS. Terrestrial. Atmos. Ocean, Science. 18, 1, 2007.
• Şahan M., DEFPOS Tasarımı, Özellikleri Ve İlk Sonuçlar Üniversitesi, Adana, 2004.
• Şahan M., Yeğingil İ., Kızıloğlu Ü., Aksaker N., Akyılmaz M., DEFPOS and Its First Results Chin. J. Astronomy And Astrophys. (ChJAA), 5, 2, 211, 2005.
• Coakley M. M., Roesler F.L., Reynolds R. J., Nossal, S., Fabry-Perot CCD Annular Summing Spectroscopy Study And Implementation For Astronomy Applications, Applied Optics, 35, 33, (1996).
• Scherb F., Hydrogen Production Rates From Ground-Based Fabry-Perot Observations Of Comet Kohoutec, The Astrophysical Journal, 243, 644, 1981.
• Morgenthaler J. P., Harris W. M., Scherb F., Oliversen R. J., Doane N. E., Combi M. R., Marconi M. L., Smyth W. H., Large-Aperture O [I] 6300 Å Photometry of Comet Hale-Bopp Implications for the Photochemistry of OH, The Astrophysical Journal, 563, 451, 2001.
• Ishida, K., Kawajiri N., Absolute Isophotometry of Galactic HII Regions in Hα Light, PASJ, 20, 95, 1968.
• Aksaker, Yeğingil İ., Şahan M., Intensity Calibration of DEFPOS Data, Experimental Astronomy, 24, 127, 2009.
• Reynolds R. J.; Ogden P. M., H II Regions Surrounding High Galactic Latitude O stars, Astronomical Journal, 87, 306, 1982.
• Draine, B. T., Magnetohydrodynamic Shocks İn Diffuse Clouds, III - The line of sight toward Zeta Ophiuchi, Astrophysical Journal, Part 1, 310, 1, 408, 1986.
• Hippelein, H. H., Fabry-Perot Interferometric Studies on H II Regions, Astronomy and Astrophysics, 25, 59, 1973.
• Hausen, N. R., Reynolds R. J., Haffner L. M., Measurements of [O I] λ6300/Hα Line Intensity Ratios for Four O Star H II Regions, The Astronomical Journal, 124, 6, 3336, 2002.
• Lesh J. R., The Kinematics of the Gould Belt an Expanding Group? Astrophysical Journal Supplement, 17, 371, 1968.
• Hoffleit D., Jaschek C., The Bright Star Catalogue, New Haven Yale University Observatory (4th edition), 1982.
• Morton D. C., Interstellar absorption lines in the spectrum of zeta Ophiuchi, Astrophysical Journal, 197, 85-115, 1975. 37. Stokes G.
• M., Interstellar titanium,
• Astrophysical Journal Supplement Series, vol. 36, 115-141, 1978.
• Hobbs L. M., Interstellar Na I, K I, CA II, and CH+ Line Profiles Toward Zeta Ophiuchi, Astrophysical Journal180, L79, 1973.
• Blitz L., Fich M.; Stark A. A., Catalog Of Co Radial Velocities Toward Galactic H II Regions, Astrophysical Journal Supplement Series, 49, 183-206, 1982.