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120 Years of RZ Dor

120 Years of RZ Dor. Jim Bedient. AAVSO Fall Meeting Nantucket, MA October 18, 2008. Abstract.

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120 Years of RZ Dor

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  1. 120 Years of RZ Dor Jim Bedient AAVSO Fall Meeting Nantucket, MA October 18, 2008

  2. Abstract Archival data on RZ Dor is examined to update its type and period. Data ranging from pre-1900 Harvard plates through AAVSO visual estimates made during the 1980s and 1990s to 21st century CCD photometry is used to confirm its type as Mira and determine an accurate period. The value of multiple, independent (yet accessible) datasets is confirmed yet again.

  3. RZ Dor • Discovered by Gerasimovič (1927) while blinking AX-series Harvard plates • Caught my eye in the course of other research: listed in the General Catalog of Variable Stars (Samus, N. N. et al. 2004) with an uncertain type, and the period and range was that given by Gerasimovič in 1927.

  4. RZ Dor • November, 2006 at HCO Plate Stacks • Located RZ Dor on 74 plates of the A, AM, MF and RB series plates dating from 1898 to 1951 • Created a photographic sequence and estimated RZ’s magnitude on each plate

  5. RZ Dor

  6. RZ Dor Sequence Sequence created from Tycho magnitudes converted to B (Henden 2006a)

  7. RZ Dor

  8. RZ Dor

  9. RZ Dor

  10. RZ Dor RZ Dor “The Triangle” From Alpha Dor NGC 1566

  11. Results 62 Plate Estimates, December 11 1898 to January 6 1951 Phased at 156.8 days.

  12. RZ Dor • 37 AAVSO Visual estimates December 4 1984 - November 8 2004 (Thank you CR) (Henden 2006b) • A boatload (454 V-band measurements) of ASAS-3 data November 20 2000 - April 28 2006 (Pojmanski 1997)

  13. RZ Dor – All Data Phased at 158.6 Days

  14. RZ Dor • RZ Dor is very definitely a Mira-type star • JDmax = 2453332 + 158.6 × E • Range V=9.5 – 14.0 • Stable for 120 years • Cutting edge science? No. • Another object defined and categorized? Yes. • Not possible without multiple independent archival data sources

  15. References • Gerasimovič, B. P., 1927, Bull. Harvard Obs., 853, 1 • Henden, A. A., 2006a, private communication • Henden, A. A., 2006b, Observations from the AAVSO International Database, private communication. • Samus, N. N. et al. 2004, GVCS 4.2 • Pojmanski, G. 1997, Acta Astronomica, 47, 467

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