IJSTR

International Journal of Scientific & Technology Research

Home Contact Us
ARCHIVES
ISSN 2277-8616











 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

IJSTR >> Volume 6 - Issue 2, February 2017 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Study Of The Flux Emitted From The Outer Surface Of The Stars Aldebaran, Fomalhaut And Rigel Observed From Nagarkot Observatory, Nagarkot, Nepal

[Full Text]

 

AUTHOR(S)

Kapil Ghimire, Karan Bhatta, Udayaraj Khanal, Prem Raj Dhungel, Saroj Shahi

 

KEYWORDS

Aldebaran, relative flux density, Fomalhaut, Rigel, Nagarkot observatory

 

ABSTRACT

We present a study on the relative flux density emitted from the outer surface of the stars Aldebaran and Fomalhaut as observed from the Nagarkot Observatory, Nepal on the 24th of November 2016. We found that the variation of the relative flux density of the stars were found to be symmetrical in nature going from the outer surface of the star to the interior of the star and finally to the outer surface of the star again through the diameters. The flux was found to be minimum at the outer surface reaching to its maximum in the interior of the star and finally to its minimum value at the outermost surface of the star. The values of the relative flux density were found to be minimum for Rigel and maximum for Aldebaran. There was a slight anomaly detected in the relative flux density of Fomalhaut which may have been due to the debris of dust that surrounds the star.

 

REFERENCES

[1] Evans, D. S., et al. "What Size is Aldebaran." The Astronomical Journal 85 (1980): 1262.

[2] Hatzes, Artie P., and William D. Cochran. "On the nature of the radial velocity variability of Aldebaran: a search for spectral line bisector variations." Monthly Notices of the Royal Astronomical Society 293.4 (1998): 469-478.

[3] Beavers, W. I., and J. Eitter. "The diameter of Aldebaran and Hyades occultations." The Astrophysical Journal 228 (1979): L111-L114.

[4] Smith, M. A. "Precise radial velocities. II-A possible detection of oscillations or running waves in Aldebaran and Arcturus." The Astrophysical Journal 265 (1983): 325-330.

[5] Kelch, WALTER L., et al. "Stellar model chromospheres. VII-Capella/G5 III+/, Pollux/K0 III/, and Aldebaran/K5 III." The Astrophysical Journal 220 (1978): 962-979.

[6] Brown, A., et al. "The radius of Aldebaran from fast photometry of the 1978 August 26 occultation." Monthly Notices of the Royal Astronomical Society187.4 (1979): 753-755.

[7] Herschel, John FW. "On the variability and periodic nature of alpha Orionis." Monthly Notices of the Royal Astronomical Society 5 (1840): 11.

[8] Gopka, V. F., and N. S. Komarov. "Abundance of Heavy Elements in the Atmosphere of Aldebaran." Soviet Astronomy 34 (1990): 610.

[9] Wasatonic, Rick, and Edward F. Guinan. "Aldebaran: discovery of small amplitude light variations." Information Bulletin on Variable Stars 4480 (1997).

[10] Brandt, John C. "St. Helena, Edmond Halley, the discovery of stellar proper motion, and the mystery of Aldebaran." Journal of Astronomical History and Heritage 13 (2010): 149-158.

[11] Eberhard, G., and K. Schwarzschild. "On the reversal of the calcium lines H and K in stellar spectra." The Astrophysical Journal 38 (1913).

[12] Hatzes, AP c-A., et al. "A giant planet around the massive giant star HD 13189." Astronomy & Astrophysics 437.2 (2005): 743-751.

[13] Panek, R. J., and Jeffery L. Leap. "Lunar occultation diameter of Aldebaran." The Astronomical Journal 85 (1980): 47-49.

[14] Gopka, V. F., and A. V. Yushchenko. "Abundance analysis of iron and light lanthanides in the atmospheres of Arcturus and Aldebaran." Astronomy Letters 20 (1994): 352-357.

[15] Hatzes, A. P., et al. "Long-lived, long-period radial velocity variations in Aldebaran: A planetary companion and stellar activity." Astronomy & Astrophysics 580 (2015): A31.

[16] Stapelfeldt, K. R., et al. "First Look at the Fomalhaut Debris Disk with the Spitzer Space TelescopeBased on observations with the NASA Spitzer Space Telescope, which is operated by the California Institute of Technology for NASA." The Astrophysical Journal Supplement Series 154.1 (2004): 458.

[17] Holland, W. S., et al. "Submillimeter observations of an asymmetric dust disk around Fomalhaut." The Astrophysical Journal 582.2 (2003): 1141.

[18] Chiang, E., et al. "Fomalhaut's debris disk and planet: Constraining the mass of Fomalhaut b from disk morphology." The Astrophysical Journal 693.1 (2009): 734.

[19] Currie, Thayne, et al. "Direct imaging confirmation and characterization of a dust-enshrouded candidate exoplanet orbiting Fomalhaut." The Astrophysical Journal Letters 760.2 (2012): L32.

[20] Kalas, Paul, et al. "STIS coronagraphic imaging of Fomalhaut: Main belt structure and the orbit of Fomalhaut b." The Astrophysical Journal 775.1 (2013): 56.

[21] Acke, Bram, et al. "Herschel images of Fomalhaut-An extrasolar Kuiper belt at the height of its dynamical activity." Astronomy & Astrophysics 540 (2012): A125.

[22] Navascues, D. "The Castor Moving Group: The age of Fomalhaut and Vega." arXiv preprint astro-ph/9905243 (1999).

[23] Absil, Olivier, et al. "AN INTERFEROMETRIC STUDY OF THE FOMALHAUT INNER DEBRIS DISK. I. NEAR-INFRARED DETECTION OF HOT DUST WITH VLTI/VINCIBased on observations made with ESO Telescopes at the Paranal Observatory (public VINCI commissioning data)." The Astrophysical Journal 704.1 (2009): 150.

[24] Le Bouquin, J-B., et al. "The spin-orbit alignment of the Fomalhaut planetary system probed by optical long baseline interferometry." Astronomy & Astrophysics 498.3 (2009): L41-L44.

[25] Nero, D., and Jon E. Bjorkman. "Did Fomalhaut, HR 8799, and HL Tauri form planets via the gravitational instability? Placing limits on the required disk masses." The Astrophysical Journal Letters 702.2 (2009): L163.

[26] Lebreton, J., et al. "An interferometric study of the Fomalhaut inner debris disk-III. Detailed models of the exozodiacal disk and its origin." Astronomy & Astrophysics 555 (2013): A146.

[27] Kenworthy, Matthew A., et al. "Coronagraphic observations of Fomalhaut at solar system scales." The Astrophysical Journal 764.1 (2013): 7.

[28] Mennesson, B., et al. "An interferometric study of the fomalhaut inner debris disk. II. Keck nuller mid-infrared observations." The Astrophysical Journal763.2 (2013): 119.

[29] Sanford, Roscoe F. "Spectroscopic Observations of Rigel with High Dispersion." The Astrophysical Journal 105 (1947): 222.

[30] Israelian, G., E. Chentsov, and F. Musaev. "The inhomogeneous circumstellar envelope of Rigel (β Orionis A)." Monthly Notices of the Royal Astronomical Society 290.3 (1997): 521-532.

[31] Moravveji, Ehsan, et al. "ASTEROSEISMOLOGY OF THE NEARBY SN-II PROGENITOR: RIGEL. I. THE MOST HIGH-PRECISION PHOTOMETRY AND RADIAL VELOCITY MONITORINGBased on data from the MOST satellite, a Canadian Space Agency mission, operated jointly by Dynacon, Inc., the University of Toronto Institute of Aerospace Studies, and the University of British Columbia, with the assistance of the University of Vienna." The Astrophysical Journal 747.2 (2012): 108.

[32] Herschel, J. F. W. "On the Variability and Periodical Nature of the Star alpha Orionis." Memoirs of the Royal Astronomical Society 11 (1840): 269.

[33] Struve, Otto, and F. E. Roach. "Variability of Halpha in Rigel." The Astrophysical Journal 77 (1933): 226.

[34] Guinan, E. F., et al. "Light, Color, and H-alpha Line Variations of Rigel." Information Bulletin on Variable Stars 2762 (1985).

[35] Sanford, Roscoe F. "The Spectrographic Orbit of the Companion to Rigel." The Astrophysical Journal 95 (1942): 421.

[36] http://www.freepatentsonline.com/6757509.html