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eJAAVSO

CHARACTERISTICS OF THE VARIABLE  STAR P CYGNI DETERMINED FROM  CLUSTER  MEMBERSHIP

 

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David G. Turner

Gary Welch

Marianne Graham

David Fairweather

Saint Mary’s University

Halifax, Nova Scotia, B3H 3C3

Canada

 

Andrew Horsford

Typex Business Centre

Newcastle-Upon-Tyne

United Kingdom

 

Michael Seymour

Queen’s University

Kingston, Ontario, K7L 3N6

Canada

 

Walter Feibelman

Goddard Space Flight Center

Laboratory for Astronomy and Solar Physics

Code 681

Greenbelt, MD 20771

 

Presented at the 89th Annual Meeting of the AAVSO, October 28th, 2000

 

Abstract

 

Empirical information on the luminosity, reddening, age, and mass of the variable B2 Oe supergiant P Cygni is derived from its assumed membership in the sparse anonymous cluster on which it is projected, as well as its association with the spatially adjacent cluster IC 4996, which forms a double cluster with the P Cyg cluster. Evidence for the high luminosity of P Cyg is confirmed by its derived absolute magnitude of MV = -8.46 ±0.03, which translates to log (L/L ) = 5.54 ±0.02 for an effective temperature consistent with the star’s derived space reddening (EB-V = 0.53 ±0.02). More surprising is an age for the associated clusters of 6 (±1.5) ´ 106 years, corresponding to a turnoff point mass of 25.1 (±5.5) M . By inference, P Cygni, as a post main-sequence object, should have a mass of no more than ~23-35 M .

Link to ADS abstract, article and citation information

 
 
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