Improving the moment approach for astrometric binaries : possible application to Cygnus X-1

• Kei YAMADA

• Masaki S. YAMAGUCHI

• Hideki ASADA

抄録

A moment approach for orbital determinations of astrometric binaries from astrometric observations alone has been recently studied for a low signal-to-noise ratio (Iwama et al. 2013, PASJ, 65, 2). Through avoiding a direct use of the time-consuming Kepler equation, temporal information is taken into account to increase the accuracy of statistical moments. As numerical tests, 100 realizations are done and the mean value and the standard deviation are also evaluated. For a semimajor axis, the difference between the mean of the recovered values and the true value decreases to less than a tenth in the case of 10000 observed points. Therefore, the present approach works better than the previous one for orbital determinations when one has a large number of observed points. The present approach is thus applicable to Cyg X-1.

収録刊行物

• Publications of the Astronomical Society of Japan

  Publications of the Astronomical Society of Japan 66 (5), 2014

  Tokyo : Astronomical Society of Japan

キーワード

• astrometry
• binaries
• close
• celestial mechanics
• methods
• analytical

詳細情報

• CRID: 1520010380745148544
• NII論文ID: 40020264881
• NII書誌ID: AA1082896X
• ISSN: 00046264
• ISSN: 2053051X
• DOI: 10.1093/pasj/psu071
• NDL書誌ID: 025913833
• Web Site: http://id.ndl.go.jp/bib/025913833
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025913833
• Web Site: https://academic.oup.com/pasj/article-pdf/66/5/97/54684956/pasj_66_5_97.pdf
• 本文言語コード: en
• NDL 雑誌分類:
  • ZM33(科学技術--宇宙科学)
• データソース種別:
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN